转载 Eclipse下的SSH开发例子
前言
确实好久没有写过了,一直以来把写博文当作自己学习的总结,当作做过的笔记,随时都可以拿出来看看。不过最近习惯了用OneNote和印象笔记,所以就很少在论坛写博文。但是偶尔看到几篇被转载了,也小小的虚荣了下。这种虚荣大神们已经习以为常,他们是不能理解的。
好吧,转入正题。
参加工作从事Java Web开发将近两年,也没有完整的搭建出一个SSH框架的项目,说出来确实有点不好意思,并且前一段一个朋友问我搭建过SSH框架没,我都没有好意思说没有。所以才有了搭建一个SSH框架项目的想法,因此有了今天的这篇博文。
这篇博文的目的
- 尝试搭建一个完整的SSH框架项目。
- 给以后的自己,也给别人一个参考。
读博文前应该注意:
- 本文提纲:本文通过一个用户注册的实例讲解SSH的整合。创建Struts项目,整合Hibernate,整合Spring。最后总结如何熟练创建SSH项目。
- 仅是创建SSH项目,对于其他的扩展例如Struts的国际化,Hibernate的缓存优化,Spring的AOP等,本博文涉及不到。想学习更多的东西请搜索其他博文。
- 本项目的环境:Windows 8-64位,Eclipse Indigo Service Release 2,Tomcat 7.0,Struts-2.2.3.1,spring-framework-3.2.3.RELEASE(本来使用Spring3.1,但是整合Spring的时候启动服务器报错。错误信息竟然是Spring框架中的方法参数空指针。。。对比Spring3.2版本后,发现在3.2种增加了判断此参数是否为空,所以最终改为用Spring3.2.3的版本。详细错误信息见本目录下5),hibernate-release-4.0.0.CR6(整合Spring3时,可以启动服务器,但是点击注册后调用UserDao类的getHibernateTemplate().save(Obj)时浏览器页面报错,但是服务器没有反应。提示org.hibernate.SessionFactory中有没有openSession(Interceptor interceptor)
方法,但是Spring框架中的代码Session session = (entityInterceptor != null ? sessionFactory.openSession(entityInterceptor) : sessionFactory.openSession())显示用到该方法,虽然调用这段代码的方法传进来的entityInterceptor就为null。。。网上搜索无果,所以最终在整合Spring的时候使用Hibernate-3.6.10.Final。详细错误信息见本目录下6),MySQL 5.5.28下的project数据库。
- user表的创建脚本。
- create table user(
- userId int auto_increment,
- userName varchar(16) not null,
- password varchar(16) not null,
- gender int not null,
- primary key(userId)
- );
- 使用Spring3.1时出现错误的详细信息。
- SEVERE: Context initialization failed
- org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.NullPointerException
- at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1445)
- at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:522)
- at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:459)
- at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
- at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
- at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
- at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
- at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:567)
- at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913)
- at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)
- at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:381)
- at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:283)
- at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111)
- at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4723)
- at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5226)
- at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5221)
- at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
- at java.util.concurrent.FutureTask.run(FutureTask.java:166)
- at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
- at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
- at java.lang.Thread.run(Thread.java:722)
- Caused by: java.lang.NullPointerException
- at org.springframework.orm.hibernate4.LocalSessionFactoryBuilder.scanPackages(LocalSessionFactoryBuilder.java:138)
- at org.springframework.orm.hibernate4.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:294)
- at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1504)
- at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1442)
- ... 20 more
- 七月 13, 2013 6:48:44 下午 org.apache.catalina.core.StandardContext listenerStart
- SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
- org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Invocation of init method failed; nested exception is java.lang.NullPointerException
- at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1445)
- at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:522)
- at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:459)
- at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)
- at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)
- at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)
- at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)
- at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:567)
- at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913)
- at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:464)
- at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:381)
- at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:283)
- at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:111)
- at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4723)
- at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5226)
- at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5221)
- at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
- at java.util.concurrent.FutureTask.run(FutureTask.java:166)
- at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
- at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
- at java.lang.Thread.run(Thread.java:722)
- Caused by: java.lang.NullPointerException
- at org.springframework.orm.hibernate4.LocalSessionFactoryBuilder.scanPackages(LocalSessionFactoryBuilder.java:138)
- at org.springframework.orm.hibernate4.LocalSessionFactoryBean.afterPropertiesSet(LocalSessionFactoryBean.java:294)
- at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1504)
- at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1442)
- ... 20 more
- 整合Spring时候,使用Hibernate时点击注册报错信息。
- java.lang.reflect.InvocationTargetException
- sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
- sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
- sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
- java.lang.reflect.Method.invoke(Method.java:601)
- com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
- com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
- com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
- com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
- org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
- com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
- com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
- com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:270)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
- com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
- org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:498)
- org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
- org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
- root cause
- java.lang.NoSuchMethodError: org.hibernate.SessionFactory.openSession()Lorg/hibernate/classic/Session;
- org.springframework.orm.hibernate3.SessionFactoryUtils.doGetSession(SessionFactoryUtils.java:323)
- org.springframework.orm.hibernate3.SessionFactoryUtils.getSession(SessionFactoryUtils.java:235)
- org.springframework.orm.hibernate3.HibernateTemplate.getSession(HibernateTemplate.java:457)
- org.springframework.orm.hibernate3.HibernateTemplate.doExecute(HibernateTemplate.java:392)
- org.springframework.orm.hibernate3.HibernateTemplate.executeWithNativeSession(HibernateTemplate.java:374)
- org.springframework.orm.hibernate3.HibernateTemplate.save(HibernateTemplate.java:683)
- com.ynwi.ssh.daoImpl.UserDao.saveObject(UserDao.java:12)
- com.ynwi.ssh.serviceImpl.UserManagerImpl.regUser(UserManagerImpl.java:23)
- com.ynwi.ssh.action.RegisterAction.execute(RegisterAction.java:29)
- sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
- sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
- sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
- java.lang.reflect.Method.invoke(Method.java:601)
- com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:452)
- com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:291)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:254)
- com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:176)
- com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.validator.ValidationInterceptor.doIntercept(ValidationInterceptor.java:263)
- org.apache.struts2.interceptor.validation.AnnotationValidationInterceptor.doIntercept(AnnotationValidationInterceptor.java:68)
- com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ConversionErrorInterceptor.intercept(ConversionErrorInterceptor.java:138)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
- com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ParametersInterceptor.doIntercept(ParametersInterceptor.java:207)
- com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.StaticParametersInterceptor.intercept(StaticParametersInterceptor.java:190)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- org.apache.struts2.interceptor.MultiselectInterceptor.intercept(MultiselectInterceptor.java:75)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- org.apache.struts2.interceptor.CheckboxInterceptor.intercept(CheckboxInterceptor.java:94)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:243)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ModelDrivenInterceptor.intercept(ModelDrivenInterceptor.java:100)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ScopedModelDrivenInterceptor.intercept(ScopedModelDrivenInterceptor.java:141)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- org.apache.struts2.interceptor.debugging.DebuggingInterceptor.intercept(DebuggingInterceptor.java:270)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ChainingInterceptor.intercept(ChainingInterceptor.java:145)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.PrepareInterceptor.doIntercept(PrepareInterceptor.java:171)
- com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:98)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.I18nInterceptor.intercept(I18nInterceptor.java:176)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- org.apache.struts2.interceptor.ServletConfigInterceptor.intercept(ServletConfigInterceptor.java:164)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.AliasInterceptor.intercept(AliasInterceptor.java:190)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- com.opensymphony.xwork2.interceptor.ExceptionMappingInterceptor.intercept(ExceptionMappingInterceptor.java:187)
- com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:248)
- org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:52)
- org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:498)
- org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
- org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:91)
创建Struts项目
创建工程
- 在Eclipse中创建一个Dynamic Web Project,本文项目名称为SSHProject。
- 把Struts内apps文件夹下的struts2-blank war包用压缩工具解压,然后把WEB-INF/lib内的jar包和WEB-INF下的web.xml文件分别复制到SSHProject项目下的WEB-INF/lib内和WEB-INF下。
- 在src目录下创建相应package。
- 在WebContent下创建Register.jsp文件,并分别创建注册成功和注册失败的Success.jsp和Fail.jsp。
操作完成后的结构如图所示:
编写代码
- web.xml的内容。
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
- <display-name>SSH Project</display-name>
- <filter>
- <filter-name>SSH</filter-name>
- <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
- </filter>
- <filter-mapping>
- <filter-name>SSH</filter-name>
- <url-pattern>/*</url-pattern>
- </filter-mapping>
- <welcome-file-list>
- <welcome-file>index.html</welcome-file>
- </welcome-file-list>
- </web-app>
- Register.jsp的内容。
- <%@ page language="java" contentType="text/html; charset=UTF-8"
- pageEncoding="UTF-8"%>
- <%@ taglib prefix="s" uri="/struts-tags"%>
- <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
- <title>User Register Page</title>
- </head>
- <body>
- <s:form action="register">
- <s:textfield name="user.username" label="用户名"></s:textfield>
- <s:password name="user.password" label="密码"></s:password>
- <s:select list="#{'1':'男','0':'女'}" listKey="key" listValue="value"
- name="user.gender" label="性别" value="1"></s:select>
- <s:submit value="注册"></s:submit>
- </s:form>
- </body>
- </html>
- 用户表单类UserForm.java的内容。
- package com.ynwi.ssh.beans;
- public class UserForm {
- private String username;
- private String password;
- private int gender;
- public String getUsername() {
- return username;
- }
- public void setUsername(String username) {
- this.username = username;
- }
- public String getPassword() {
- return password;
- }
- public void setPassword(String password) {
- this.password = password;
- }
- public int getGender() {
- return gender;
- }
- public void setGender(int gender) {
- this.gender = gender;
- }
- }
- 注册Action类RegisterAction.java的内容。
- package com.ynwi.ssh.action;
- import com.opensymphony.xwork2.ActionSupport;
- import com.ynwi.ssh.beans.UserForm;
- import com.ynwi.ssh.service.UserManager;
- import com.ynwi.ssh.serviceImpl.UserManagerImpl;
- public class RegisterAction extends ActionSupport {
- private static final long serialVersionUID = 1L;
- private UserForm user;
- private UserManager userManager;
- public UserForm getUser() {
- return user;
- }
- public void setUser(UserForm user) {
- this.user = user;
- }
- public UserManager getUserManager() {
- return userManager;
- }
- public void setUserManager(UserManager userManager) {
- this.userManager = userManager;
- }
- public String execute() {
- try {
- this.setUserManager(new UserManagerImpl());
- userManager.regUser(user);
- return SUCCESS;
- } catch (Exception e) {
- e.printStackTrace();
- return ERROR;
- }
- }
- }
- 验证文件RegisterAction-validation.xml的内容。该xml文件为RegisterAction的验证文件,命名格式固定,为< ActionName >-validation.xml。
- <?xml version="1.0" encoding="GBK"?>
- <!DOCTYPE validators PUBLIC "-//OpenSymphony Group//XWork Validator 1.0.2//EN"
- "http://www.opensymphony.com/xwork/xwork-validator-1.0.2.dtd">
- <validators>
- <!-- 添加对用户名的校验 -->
- <field name="user.username">
- <field-validator type="requiredstring">
- <param name="trim">true</param>
- <message>用户名不能为空</message>
- </field-validator>
- <field-validator type="regex">
- <param name="expression"><![CDATA[(\w{6,16})]]></param>
- <message>用户名输入不合法,必须为长度在6~16中间的数字或字母</message>
- </field-validator>
- </field>
- <!-- 添加对密码的校验 -->
- <field name="user.password">
- <field-validator type="requiredstring">
- <param name="trim">true</param>
- <message>密码不能为空</message>
- </field-validator>
- <field-validator type="regex">
- <param name="expression"><![CDATA[(\w{6,16})]]></param>
- <message>密码输入不合法,必须为长度在6~16之间的数字或者字母</message>
- </field-validator>
- </field>
- </validators>
- 业务逻辑接口UserManaer.java的内容。
- package com.ynwi.ssh.service;
- import com.ynwi.ssh.beans.UserForm;
- public interface UserManager {
- public void regUser(UserForm user);
- }
- 业务逻辑实现类UserManagerImpl.java的内容
- package com.ynwi.ssh.serviceImpl;
- import com.ynwi.ssh.beans.UserForm;
- import com.ynwi.ssh.service.UserManager;
- public class UserManagerImpl implements UserManager {
- @Override
- public void regUser(UserForm user) {
- }
- }
- 配置文件struts.xml的内容。
- <?xml version="1.0" encoding="UTF-8" ?>
- <!DOCTYPE struts PUBLIC
- "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
- "http://struts.apache.org/dtds/struts-2.0.dtd">
- <struts>
- <include file="struts-default.xml" />
- <package name="ynwi" extends="struts-default">
- <action name="register" class="com.ynwi.ssh.action.RegisterAction">
- <result name="input">/Register.jsp</result>
- <result name="success">/Success.jsp</result>
- <result name="error">/Fail.jsp</result>
- </action>
- </package>
- </struts>
Success.jsp和Fail.jsp仅仅只是一句提示注册成功和失败的话,这里就不在列出。
运行效果
- 输入访问Register.jsp的地址http://localhost:9090/SSHProject/Register.jsp后。
- 输入用户名和密码不合法时。
- 注册成功时。
在Struts基础上整合Hibernate
整合Hibernate
- 将Hibernate内的lib/required下的jar包和lib/jpa下的jar包复制到SSHProject项目的lib目录下。
- 在上面Struts项目的基础上添加com.ynwi.ssh.dao和com.ynwi.ssh.daoImpl包。分别创建BaseDao接口和UserDao类。
- 在数据库中创建对应的表user来写入要注册的用户。创建表的脚本见前言说明部分。
- 创建user表的Hibernate映射文件。因为这里要创建user表对应的POJO类,所以我这里把之前com.ynwi.ssh.beans包改成com.ynwi.ssh.forms包,用来存放页面传过来的表单数据,新创建com.ynwi.ssh.beans包,用来创建POJO对象来对应数据库中的表。路径:POJO类同目录。
- 建立Hibernate配置文件。路径:src目录下。
- 编写Session工厂类。整合Spring后,数据源的创建和SessionFactory的创建都交给Spring去管理,就无需这个工厂类了,所以这里我临时创建在daoImpl包里面。
- 修改业务逻辑实现类。
操作完成后的结构如图所示:
编写代码
- 接口类BaseDao.java的内容。注意:接口里的两个get/set方法是为了让实现类覆盖。这样使用BaseDao dao = new UserDao()的时候,dao实体中有这两个方法。
- package com.ynwi.ssh.dao;
- import org.hibernate.HibernateException;
- import org.hibernate.Session;
- public interface BaseDao {
- public void saveObject(Object obj) throws HibernateException;
- public Session getSession();
- public void setSession(Session session);
- }
- 实现类UserDao.java的内容。
- package com.ynwi.ssh.daoImpl;
- import org.hibernate.HibernateException;
- import org.hibernate.Session;
- import com.ynwi.ssh.dao.BaseDao;
- public class UserDao implements BaseDao {
- private Session session;
- @Override
- public Session getSession() {
- return session;
- }
- @Override
- public void setSession(Session session) {
- this.session = session;
- }
- @Override
- public void saveObject(Object obj) throws HibernateException {
- session.save(obj);
- }
- }
- 表user的POJO类User.java的内容,因为跟UserForm.java内容差不多,所以不再列出。这个比UserForm.java多一个userId属性,因为在表user里面有userId的column。在POJO类里需要跟这个column有映射。
- POJO类User.java的Hibernate映射文件User.hbm.xml的内容。代码<generator class="native"></generator>说明将根据本地数据库的设置来创建userId,如MySQL中将表user的userId设置为自动增长,则在保存记录是,userId将自动增长。对于需要在程序中指定主键的值,则将generator的class属性设置为assigned。
- <?xml version="1.0" encoding='UTF-8'?>
- <!DOCTYPE hibernate-mapping PUBLIC
- "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
- "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >
- <hibernate-mapping package="com.ynwi.ssh.beans">
- <class name="User" table="user">
- <id name="userId" column="userId">
- <generator class="native"></generator>
- </id>
- <property name="username" column="userName" type="java.lang.String"
- not-null="true" length="16"></property>
- <property name="password" column="password" type="java.lang.String"
- not-null="true" length="16" />
- <property name="gender" column="gender" type="java.lang.Integer" length="1" />
- </class>
- </hibernate-mapping>
- Hibernate配置文件Hibernate.cfg.xml的内容。
- <?xml version='1.0' encoding='utf-8'?>
- <!DOCTYPE hibernate-configuration PUBLIC
- "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
- "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
- <hibernate-configuration>
- <session-factory>
- <!-- Database connection settings -->
- <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
- <property name="connection.url">jdbc:mysql://localhost:3306/project</property>
- <property name="connection.username">root</property>
- <property name="connection.password">root</property>
- <!-- JDBC connection pool (use the built-in) -->
- <!-- <property name="connection.pool_size">1</property> -->
- <!-- SQL dialect -->
- <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
- <!-- Enable Hibernate's automatic session context management -->
- <!-- <property name="current_session_context_class">thread</property> -->
- <!-- Disable the second-level cache -->
- <!-- <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property> -->
- <!-- Echo all executed SQL to stdout -->
- <property name="show_sql">true</property>
- <!-- Drop and re-create the database schema on startup -->
- <!-- <property name="hbm2ddl.auto">update</property> -->
- <mapping resource="com/ynwi/ssh/beans/User.hbm.xml"/>
- </session-factory>
- </hibernate-configuration>
- 工厂类SessionFactory的内容。(这是使用Hibernate4时候的SessionFactory,Hibernate3时候sessionFactory的创建估计会不一样,请自行查阅。)
- package com.ynwi.ssh.daoImpl;
- import org.hibernate.HibernateException;
- import org.hibernate.Session;
- import org.hibernate.SessionFactory;
- import org.hibernate.cfg.Configuration;
- import org.hibernate.service.ServiceRegistry;
- import org.hibernate.service.ServiceRegistryBuilder;
- public class HibernateSessionFactory {
- private static final String CFG_FILE_LOCATION = "/Hibernate.cfg.xml";
- private static final ThreadLocal<Session> threadLocal = new ThreadLocal<Session>();
- private static final Configuration cfg = new Configuration()
- .configure(CFG_FILE_LOCATION);
- private static ServiceRegistryBuilder builder = new ServiceRegistryBuilder()
- .applySettings(cfg.getProperties());
- private static ServiceRegistry registry;
- private static SessionFactory sessionFactory;
- public static Session currentSession() throws HibernateException {
- Session session = threadLocal.get();
- if (session == null || session.isOpen() == false) {
- if (sessionFactory == null) {
- try {
- registry = builder.buildServiceRegistry();
- sessionFactory = cfg.buildSessionFactory(registry);
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
- session = sessionFactory.openSession();
- threadLocal.set(session);
- }
- return session;
- }
- public static void closeSession() throws HibernateException {
- Session session = threadLocal.get();
- threadLocal.set(null);
- if (session != null) {
- session.close();
- }
- }
- }
- 修改后的业务逻辑实现类的内容。
- package com.ynwi.ssh.serviceImpl;
- import org.hibernate.HibernateException;
- import org.hibernate.Session;
- import org.hibernate.Transaction;
- import com.ynwi.ssh.beans.User;
- import com.ynwi.ssh.dao.BaseDao;
- import com.ynwi.ssh.daoImpl.HibernateSessionFactory;
- import com.ynwi.ssh.daoImpl.UserDao;
- import com.ynwi.ssh.forms.UserForm;
- import com.ynwi.ssh.service.UserManager;
- public class UserManagerImpl implements UserManager {
- private BaseDao dao;
- private Session session;
- public UserManagerImpl() {
- dao = new UserDao();
- }
- @Override
- public void regUser(UserForm userForm) throws HibernateException {
- session = HibernateSessionFactory.currentSession();
- dao.setSession(session);
- // 获取事务
- Transaction ts = session.beginTransaction();
- // 构造User对象
- User user = new User();
- user.setUsername(userForm.getUsername());
- user.setPassword(userForm.getPassword());
- user.setGender(userForm.getGender());
- // 保存User对象
- dao.saveObject(user);
- // 提交事务
- ts.commit();
- // 关闭Session
- HibernateSessionFactory.closeSession();
- }
- }
运行效果
- 输入访问Register.jsp的地址http://localhost:9090/SSHProject/Register.jsp后。
- 点击注册前后数据库里面的数据。
在Struts + Hibernate项目中整合Spring
整合Spring
- 将Spring内libs目录下包含所有的jar包(不需要复制结尾为sources和javadoc的jar包)到SSHProject项目的lib目录下。
- 编写Spring的配置文件applicationContext.xml。路径:src目录下,需要在web.xml配置context-param指定路径,或者把该文件放在WEB-INF下,跟web.xml同目录。这里由于Spring配置数据源的需要,需要把Hibernate内lib/optional/c3p0下的c3p0-0.9.1.jar复制到lib不目下。
- 修改BaseDao和UserDao。在引入Spring后,需要用Spring进行统一的事务管理,数据源和sessionFactory都交给Spring去生成,因此接口类和实现类BaseDao和UserDao都需要做相应的修改。Spring提供了HibernateDaoSupport类来完成对数据的操作,因此UserDao在实现BaseDao的同时还需要继承HibernateDaoSupport类。并将先前session的操作修改成HibernateTemplate(可通过getHibernateTemplate()方法来获得)的操作。
- 修改业务逻辑实现类。在没有加入Spring之前,业务逻辑实现类的Session的获得,dao的实例化,以及事务的管理都是该类执行管理的。加入Spring后,这些都交给Spring去管理。该类的dao的实例化由Spring注入。
- 修改用户注册的RegisterAction类。同样,RegisterAction类中的userManager的实例化也由Spring注入。
- 删除Hibernate的配置文件Hibernate.cfg.xml和工厂类HibernateSesseionFactory类。他们的工作已经交给Spring去做,已经不再有用。
- 修改web.xml,加载Spring。要想启动时加载Spring的配置文件,需要在web.xml中配置对应的监听器(listenser),并制定Spring的配置文件。
- 修改Struts的配置文件struts.xml。把原来指定的名为register的action的class由原来的路径变为applicationContext.xml文件中该Action的id。
操作完成后的结构如图所示:
编写代码
- Spring的配置文件applicationContext.xml的内容。
- <?xml version="1.0" encoding="UTF-8"?>
- <beans xmlns="http://www.springframework.org/schema/beans"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://www.springframework.org/schema/beans
- http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
- <!-- 定义数据源的信息 -->
- <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"
- destroy-method="close">
- <property name="driverClass">
- <value>com.mysql.jdbc.Driver</value>
- </property>
- <property name="jdbcUrl">
- <value>jdbc:mysql://localhost/project</value>
- </property>
- <property name="user">
- <value>root</value>
- </property>
- <property name="password">
- <value>root</value>
- </property>
- <property name="maxPoolSize">
- <value>80</value>
- </property>
- <property name="minPoolSize">
- <value>1</value>
- </property>
- <property name="initialPoolSize">
- <value>1</value>
- </property>
- <property name="maxIdleTime">
- <value>20</value>
- </property>
- </bean>
- <!--定义Hibernate的SessionFactory -->
- <!-- SessionFactory使用的数据源为上面的数据源 -->
- <!-- 指定了Hibernate的映射文件和配置信息 -->
- <bean id="sessionFactory"
- class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
- <property name="dataSource">
- <ref local="dataSource" />
- </property>
- <property name="mappingResources">
- <list>
- <value>com/ynwi/ssh/beans/User.hbm.xml</value>
- </list>
- </property>
- <property name="hibernateProperties">
- <props>
- <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
- <prop key="show_sql">true</prop>
- <prop key="hibernate.jdbc.batch_size">20</prop>
- </props>
- </property>
- </bean>
- <bean id="transactionManager"
- class="org.springframework.orm.hibernate3.HibernateTransactionManager">
- <property name="sessionFactory" ref="sessionFactory" />
- </bean>
- <bean id="baseDao" class="com.ynwi.ssh.daoImpl.UserDao">
- <property name="sessionFactory">
- <ref bean="sessionFactory" />
- </property>
- </bean>
- <!--用户注册业务逻辑类 -->
- <bean id="userManager" class="com.ynwi.ssh.serviceImpl.UserManagerImpl">
- <property name="dao">
- <ref bean="baseDao" />
- </property>
- </bean>
- <!-- 用户注册的Action -->
- <bean id="regAction" class="com.ynwi.ssh.action.RegisterAction">
- <property name="userManager">
- <ref bean="userManager" />
- </property>
- </bean>
- <!-- more bean definitions go here -->
- </beans>
- 修改后的接口类Dao和实现类UserDao的内容。
BaseDao.java
- package com.ynwi.ssh.dao;
- import org.hibernate.HibernateException;
- public interface BaseDao {
- public void saveObject(Object obj) throws HibernateException;
- }
UserDao.java
- package com.ynwi.ssh.daoImpl;
- import org.hibernate.HibernateException;
- import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
- import com.ynwi.ssh.dao.BaseDao;
- public class UserDao extends HibernateDaoSupport implements BaseDao {
- @Override
- public void saveObject(Object obj) throws HibernateException {
- getHibernateTemplate().save(obj);
- }
- }
- 修改后的业务逻辑实现类UserManagerImpl的内容。
- package com.ynwi.ssh.serviceImpl;
- import org.hibernate.HibernateException;
- import org.springframework.beans.BeanUtils;
- import com.ynwi.ssh.beans.User;
- import com.ynwi.ssh.dao.BaseDao;
- import com.ynwi.ssh.forms.UserForm;
- import com.ynwi.ssh.service.UserManager;
- public class UserManagerImpl implements UserManager {
- private BaseDao dao;
- public void setDao(BaseDao dao) {
- this.dao = dao;
- }
- @Override
- public void regUser(UserForm userForm) throws HibernateException {
- User user = new User();
- BeanUtils.copyProperties(userForm, user);
- dao.saveObject(user);
- }
- }
- 修改后的用户注册Action类RegisterAction的内容。
- package com.ynwi.ssh.action;
- import com.opensymphony.xwork2.ActionSupport;
- import com.ynwi.ssh.forms.UserForm;
- import com.ynwi.ssh.service.UserManager;
- public class RegisterAction extends ActionSupport {
- private static final long serialVersionUID = 1L;
- private UserForm user;
- private UserManager userManager;
- public UserForm getUser() {
- return user;
- }
- public void setUser(UserForm user) {
- this.user = user;
- }
- public void setUserManager(UserManager userManager) {
- this.userManager = userManager;
- }
- public String execute() {
- try {
- userManager.regUser(user);
- return SUCCESS;
- } catch (Exception e) {
- e.printStackTrace();
- return ERROR;
- }
- }
- }
- 修改后的web.xml的内容。
- <?xml version="1.0" encoding="UTF-8"?>
- <web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
- xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
- xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">
- <display-name>SSH Project</display-name>
- <filter>
- <filter-name>SSH</filter-name>
- <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
- </filter>
- <filter-mapping>
- <filter-name>SSH</filter-name>
- <url-pattern>/*</url-pattern>
- </filter-mapping>
- <listener>
- <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
- </listener>
- <welcome-file-list>
- <welcome-file>index.html</welcome-file>
- </welcome-file-list>
- </web-app>
- 修改后的Struts配置文件struts.xml的内容。
- <?xml version="1.0" encoding="UTF-8" ?>
- <!DOCTYPE struts PUBLIC
- "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
- "http://struts.apache.org/dtds/struts-2.0.dtd">
- <struts>
- <include file="struts-default.xml" />
- <package name="ynwi" extends="struts-default">
- <action name="register" class="regAction">
- <result name="input">/Register.jsp</result>
- <result name="success">/Success.jsp</result>
- <result name="error">/Fail.jsp</result>
- </action>
- </package>
- </struts>
运行结果
- 输入访问Register.jsp的地址http://localhost:9090/SSHProject/Register.jsp后。
- 点击注册前后数据库里面的数据。
总结
唠叨
本来想创建Struts2 + Spring3 + Hibernate4的项目,结果行动之后才发现版本之间不兼容的现象挺严重(我自己是这么认为的,如果有大神看出来是我开发中出的问题导致麻烦告知下),不得不把Hibernate4换成Hibernate3。因为中间换框架,所以导致此博文中整合Hibernate部分是否会报错,不过最终的项目是可以执行的。我会把项目打包上传到csdn资源上。可以点击这里下载。
如何快速开发SSH框架项目
- 创建Dynamic Web Project并且导入jar包。
- 我习惯上把classes文件夹由build文件夹内转移到WEB-INF下。在项目上右键Build Path——〉Configure Build Path。设置Default output folder。
- 在WEB_INF下面创建web.xml并配置Struts的Filter和Spring的Listener。
- 在WEB-INF下面创建applicationContext.xml并配置数据源,sessionFactory,Transaction以及各Beans信息。
- 在src目录下创建struts.xml用来配置action信息,模板可以从Struts空项目里面拿。这里的action对应的class应该为applicationContext.xml内对应的class的bean的id。
转载 Eclipse下的SSH开发例子的更多相关文章
- eclipse下的webservice开发
关于eclipse下的webservice开发,有非常多的教程,这里只记下学习过程中的弯路: 1.无论是CXF模式还是AXIS模式,在出现start server之后,点击next报错:"s ...
- 在Eclipse下搭建Hadoop开发环境
在前面的博文中博主展示了如何在虚拟机中搭建Hadoop的单节点伪分布集群,今天给大家介绍一下如何在Eclipse环境中搭建Hadoop的管理和开发环境,话不多说,下面我们就进入正题吧! 1.JDK安装 ...
- 在Eclipse下搭建Android开发环境教程
我们昨天向各位介绍了<在NetBeans上搭建Android SDK环境>,前不久也介绍过<在MyEclipse 8.6上搭建Android开发环境>, 都受到了读者的欢迎.但 ...
- 【转】在Eclipse下搭建Android开发环境教程
本文将全程演示Android开发环境的搭建过程,无需配置环境变量.所有软件都是写该文章时最新版本,希望大家喜欢. 一 相关下载 三 Eclipse配置 (1)Java JDK下载 1 安装andr ...
- eclipse下的ssh框架整合过程及測试
最近在搭建Stuts2+hibernate+spring的框架,网上看的教程,大部分都是非常easy的步骤.没有比較具体的步骤以及每一个步骤完毕之后怎样检查是否配置成功.下面是笔者依据自己搭建的过程进 ...
- Eclipse下配置C++开发环境(转)
1. 首先确保你的电脑上已经安装了Java,如果没有,或者不确定,请到官网上下载并安装,网址如下(这一步我就不详述了): http://www.java.com/zh_CN/ 2. 到官网上下载并 ...
- (转载)Eclipse下配置Github环境 .
总的参考文档:EGit User Guide http://wiki.eclipse.org/EGit/User_Guide Address: http://www.linuxidc.com/Linu ...
- eclipse下的web开发问题总结[struts2文件上传]
最近需要做一个web方面的文件上传的Demo.开发工具是eclipse[具体名称:Eclipse IDE for Java EE Developers 版本:2.0.0.20130613-0530]. ...
- 【hadoop之翊】——windows 7使用eclipse下hadoop应用开发环境搭建
由于一些缘故,这节内容到如今才写.事实上弄hadoop有一段时间了,能够编写一些小程序了,今天来还是来说说环境的搭建.... 说明一下:这篇文章的步骤是接上一篇的hadoop文章的:http://bl ...
随机推荐
- Linux中oracle安装时候报ora-00119解决办法
ORA-00119: invalid specification for system parameter LOCAL_LISTENER ORA-00130: invalid listener add ...
- 转帖:深入理解JavaScript系列
感觉汤姆大叔这个系列写的很是不错,很适合有js基础但是想深入又无从下手的朋友. 深入理解JavaScript系列
- -canOpenURL: failed for URL
这在 Xcode 6.4 + iOS 8 时,是不会有的情况,原因是[为了强制增强数据访问安全, iOS9 默认会把所有从NSURLConnection . CFURL . NSURLSession发 ...
- (原)Ubuntu16 中安装torch版的cudnn
转载请注明出处: http://www.cnblogs.com/darkknightzh/p/5668471.html 参考网址: https://devtalk.nvidia.com/default ...
- 关于char/varchar(n)中n的探究:字符数or字节数
[问题来源]将设计的数据库表展示的时候,yu哥问我,你的那个top_info字段定义的类型是varchar(100),为什么是100呢,这100的长度能存多少个中文? 当时的想法就是,这个100能存多 ...
- python运维开发(十八)----Django(二)
内容目录 路由系统 模版 Ajax model数据库操作,ORM 路由系统 django中的路由系统和其他语言的框架有所不同,在django中每一个请求的url都要有一条路由映射,这样才能将请求交给对 ...
- NOI十连测 第六测 T3
思路:考试的时候我非常地**,写了圆并,然后还TM写了半平面交和三角剖分,虽然只有30分..但是看在我写了500行的份上还是挂着吧.. #include<cstdio> #include& ...
- 对Qt for Android的评价(很全面,基本已经没有问题了,网易战网客户端就是Qt quick写的),可以重用QT积累20年的RTL是好事,QML效率是HTML5的5倍
现在Qt不要光看跨平台了,Qt也有能力和原生应用进行较量的.可以直接去Qt官网查看他和那些厂商合作.关于和Java的比较,框架和Java进行比较似乎不且实际.如果是C++和Java比较,网上有很多文章 ...
- UESTC_方老师的分身 II CDOJ 915
方老师的分身 II Time Limit: 10000/5000MS (Java/Others) Memory Limit: 65535/65535KB (Java/Others) Submi ...
- django项目环境搭建备忘
由于使用python3,所以尽量为每个项目配置虚拟环境来管理各个项目的=. 新建一个项目文件夹,进入该路径 python3 -m venv ll_env 然后激活虚拟环境 source ll_env/ ...