1.mybatis是比较新的半自动orm框架,效率也比较高,优点是sql语句的定制,管理与维护,包括优化,缺点是对开发人员的sql功底要求较高,如果比较复杂的查询,表与表之间的关系映射到对象与对象之间的关系时,mapper.xml中的配置会恶心死你;

2.demo中只涉及到一张user表,同样的,我将演示ssm对单表的操作;

3.与案例一相同,我还是会对dao进行抽离,使得抽离出的核心dao具有通用性,其他模块dao只需继承核心dao即可;

4.demo整体包结构

数据库

create database ssjdbc;//创建ssjdbc数据库

//创建user表
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(32) DEFAULT NULL,
`password` varchar(32) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8; //插入数据3条
insert into user(username,password) values (1001,123),(1002,456),(1003,789);

5.各配置文件

(1)pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.xiaog</groupId>
<artifactId>testssm</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging> <dependencies>
<!-- spring+springmvc顶级依赖包,包含spring-webmvc、spring-aop、spring-beans、
spring-context、spring-core、spring-jcl、spring-expression、spring-web -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.5.RELEASE</version>
</dependency> <!-- spring-aop所依赖的静态代理 ,
使用aop方式管理事务,在service方法执行前开启事务,
方法执行后提交事务,方法执行失败回滚事务-->
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjrt</artifactId>
<version>1.8.0</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.0</version>
</dependency> <!-- 使用jdbcTemplate中的事务实现 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.5.RELEASE</version>
</dependency> <!-- 数据库方面 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.10</version>
</dependency> <!-- orm框架 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.0</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.0</version>
</dependency> <!-- Logback -->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.1.3</version>
</dependency>
<dependency>
<groupId>org.logback-extensions</groupId>
<artifactId>logback-ext-spring</artifactId>
<version>0.1.2</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>jcl-over-slf4j</artifactId>
<version>1.7.12</version>
</dependency> <!-- jsp需要 -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>3.0-alpha-1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.1.2</version>
</dependency>
</dependencies> <build>
<defaultGoal>compile</defaultGoal>
<plugins>
<!-- maven插件 -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
<encoding>UTF-8</encoding>
</configuration>
</plugin> <!-- tomcat插件 -->
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.1</version>
<configuration>
<port>9999</port>
<path>/testssm</path>
<uriEncoding>UTF-8</uriEncoding>
<finalName>testssm</finalName>
<server>tomcat7</server>
</configuration>
</plugin> </plugins>
</build>
</project>

(2)spring-context.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx" xmlns:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation="http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd"
default-autowire="byName" default-lazy-init="true">
<description>Spring公共配置 </description>
<!-- 1.扫描包: @Repository @Service @Autowired @Resource -->
<context:component-scan base-package="com.xiaog.dao,com.xiaog.service" /> <!-- 2.加载配置文件 -->
<context:property-placeholder location="classpath:jdbc.properties" /> <!-- 3.配置连接池 :druid连接池 -->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource">
<property name="driverClassName" value="${jdbc.driver}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<!-- 初始化连接数量 -->
<property name="initialSize" value="5" />
<!-- 最大连接数 -->
<property name="maxActive" value="100" />
<!-- 最小连接数 -->
<property name="minIdle" value="5" />
<!-- 配置获取连接等待超时的时间 -->
<property name="maxWait" value="120000" />
<!-- 超过时间限制是否回收 -->
<property name="removeAbandoned" value="true" />
<!-- 超过时间限制多长 -->
<property name="removeAbandonedTimeout" value="1800" />
<!-- 配置间隔多久才进行一次检测,检测需要关闭的空闲连接,单位是毫秒 -->
<property name="timeBetweenEvictionRunsMillis" value="120000" />
<!-- 配置一个连接在池中最小生存的时间,单位是毫秒 -->
<property name="minEvictableIdleTimeMillis" value="300000" />
<!-- 用来检测连接是否有效的sql,要求是一个查询语句 -->
<property name="validationQuery" value="SELECT 1" />
<!-- 申请连接的时候检测 -->
<property name="testWhileIdle" value="true" />
<!-- 申请连接时执行validationQuery检测连接是否有效,配置为true会降低性能 -->
<property name="testOnBorrow" value="false" />
<!-- 归还连接时执行validationQuery检测连接是否有效,配置为true会降低性能 -->
<property name="testOnReturn" value="false" />
<!-- 打开PSCache,并且指定每个连接上PSCache的大小 -->
<property name="poolPreparedStatements" value="true" />
<property name="maxPoolPreparedStatementPerConnectionSize" value="20" />
<property name="defaultAutoCommit" value="false" />
<!-- 配置监控统计拦截的filters -->
<property name="filters" value="stat"/>
</bean> <!-- 4.spring集成mybatis -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:mybatis-config.xml" />
<property name="mapperLocations" value="classpath:mapper/*.xml" />
</bean> <!-- 5.配置事务管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
</bean>
<!-- 6.配置aop -->
<!-- 配置通知: 定位方法 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<tx:attributes>
<tx:method name="*" />
</tx:attributes>
</tx:advice>
<!-- 配置切面 -->
<aop:config>
<!-- 定位具体的类:完整类名,使用通配符 -->
<aop:advisor advice-ref="txAdvice" pointcut="execution(* com.xiaog.service.*.*(..))" />
</aop:config> </beans>

(3)spring-mvc.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd"> <!-- 1.启动自动扫描 -->
<context:component-scan base-package="com.xiaog.controller" /> <!-- 2.注册MVC注解驱动 -->
<mvc:annotation-driven /> <!-- 3.配置静态资源 css js imgs -->
<mvc:resources location="/resources/**" mapping="/resources"/>
<mvc:resources location="/webapp/static/**" mapping="/webapp/static"/> <!-- 4.配置视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name = "prefix" value="/" /><!-- 前缀 -->
<property name = "suffix" value = ".jsp" /><!-- 后缀 -->
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView" />
</bean> </beans>

(4)mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<typeAliases>
<package name="com.xiaog.entity" />
</typeAliases>
</configuration>

(5)logback.xml

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<!-- 控制台输出 -->
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<!-- 日志输出编码 -->
<!-- <Encoding>UTF-8</Encoding> -->
<layout class="ch.qos.logback.classic.PatternLayout">
<!--格式化输出:%d表示日期,%thread表示线程名,%-5level:级别从左显示5个字符宽度%msg:日志消息,%n是换行符-->
<pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{50} - %msg%n
</pattern>
</layout>
</appender>
<!-- 日志输出级别 -->
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
<!-- 打印sql语句 -->
<logger name="com.xiaog.dao" level="DEBUG" />
</configuration>

(6)jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssjdbc?useSSL=false&amp;useUnicode=true&amp;characterEncoding=utf8
jdbc.username=root
jdbc.password=root

(7)UserMapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.xiaog.dao.UserDao" >
<resultMap id="BaseResultMap" type="User" >
<id column="id" property="id" jdbcType="INTEGER" />
<result column="username" property="username" jdbcType="VARCHAR" />
<result column="password" property="password" jdbcType="VARCHAR" />
</resultMap>
<sql id="Base_Column_List" >
id, username, password
</sql> <select id="getOne" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
select
<include refid="Base_Column_List" />
from user
where id = #{id,jdbcType=INTEGER}
</select> <select id="getList" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
select
<include refid="Base_Column_List" />
from user
<where>
<if test="username != null" >
and username = #{username,jdbcType=VARCHAR}
</if>
<if test="password != null" >
and password = #{password,jdbcType=VARCHAR}
</if>
</where>
</select> <delete id="delete" parameterType="java.lang.Integer" >
delete from user
where id = #{id,jdbcType=INTEGER}
</delete> <insert id="insert" parameterType="User" >
insert into user
<trim prefix="(" suffix=")" suffixOverrides="," >
<if test="id != null" >
id,
</if>
<if test="username != null" >
username,
</if>
<if test="password != null" >
password,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides="," >
<if test="id != null" >
#{id,jdbcType=INTEGER},
</if>
<if test="username != null" >
#{username,jdbcType=VARCHAR},
</if>
<if test="password != null" >
#{password,jdbcType=VARCHAR},
</if>
</trim>
</insert> <update id="update" parameterType="User" >
update user
<set >
<if test="username != null" >
username = #{username,jdbcType=VARCHAR},
</if>
<if test="password != null" >
password = #{password,jdbcType=VARCHAR},
</if>
</set>
where id = #{id,jdbcType=INTEGER}
</update> </mapper>

(8)web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<display-name>testssm</display-name>
<!-- spring配置文件 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-context.xml</param-value>
</context-param>
<!-- spring监听器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener> <!-- 字符编码过滤器 spring web自动提供一个 -->
<filter>
<filter-name>encodingFilter</filter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
<init-param>
<param-name>encoding</param-name>
<param-value>UTF-8</param-value>
</init-param>
<init-param>
<param-name>forceEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>encodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping> <!-- spring mvc 配置 【中央控制器/前端控制器/总控】 -->
<servlet>
<servlet-name>spring-mvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 配置Spring mvc下的配置文件的位置和名称 -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- 可以配置扩展名,*.do -->
<servlet-mapping>
<servlet-name>spring-mvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping> <!-- 添加日志监听器 -->
<context-param>
<param-name>logbackConfigLocation</param-name>
<param-value>classpath:logback.xml</param-value>
</context-param>
<listener>
<listener-class>ch.qos.logback.ext.spring.web.LogbackConfigListener</listener-class>
</listener> <welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

6.实体类User

package com.xiaog.entity;

public class User {
private Integer id; private String username; private String password; public Integer getId() {
return id;
} public void setId(Integer id) {
this.id = id;
} public String getUsername() {
return username;
} public void setUsername(String username) {
this.username = username == null ? null : username.trim();
} public String getPassword() {
return password;
} public void setPassword(String password) {
this.password = password == null ? null : password.trim();
} @Override
public String toString() {
return "User [id=" + id + ", username=" + username + ", password=" + password + "]";
} }

7.核心Dao接口及其实现

package com.xiaog.core.dao;

import java.util.List;

public interface CoreDao<T> {

    int insert(T t);

    int delete(int id);

    int update(T t);

    T getOne(int id);

    List<T> getList(T t);

}
package com.xiaog.core.dao.impl;

import java.lang.reflect.ParameterizedType;
import java.util.List; import org.mybatis.spring.support.SqlSessionDaoSupport; import com.xiaog.core.dao.CoreDao; public class CoreDaoImpl<T> extends SqlSessionDaoSupport implements CoreDao<T> { private Class<T> clazz;
private static String PREFIX; @SuppressWarnings("unchecked")
public CoreDaoImpl() {
this.clazz = (Class<T>)((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
PREFIX = "com.xiaog.dao."+clazz.getSimpleName()+"Dao.";
} @Override
public int insert(T t) {
return super.getSqlSession().insert(PREFIX+"insert",t);
} @Override
public int delete(int id) {
return super.getSqlSession().delete(PREFIX+"delete", id);
} @Override
public int update(T t) {
return super.getSqlSession().update(PREFIX+"update", t);
} @Override
public T getOne(int id) {
return super.getSqlSession().selectOne(PREFIX+"getOne", id);
} @Override
public List<T> getList(T t) {
return super.getSqlSession().selectList(PREFIX+"getList", t);
} }

8.模块dao接口及其实现

package com.xiaog.dao;

import com.xiaog.core.dao.CoreDao;
import com.xiaog.entity.User; public interface UserDao extends CoreDao<User> { }
package com.xiaog.dao.impl;

import org.springframework.stereotype.Repository;

import com.xiaog.core.dao.impl.CoreDaoImpl;
import com.xiaog.dao.UserDao;
import com.xiaog.entity.User; @Repository
public class UserDaoImpl extends CoreDaoImpl<User> implements UserDao { }

9.service接口及其实现

package com.xiaog.service;

import com.xiaog.entity.User;

public interface UserService {

    User login(User user);

}
package com.xiaog.service.impl;

import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service; import com.xiaog.dao.UserDao;
import com.xiaog.entity.User;
import com.xiaog.service.UserService; @Service
public class UserServiceImpl implements UserService { @Autowired
private UserDao userDao; @Override
public User login(User user) {
List<User> users = userDao.getList(user);
if(users!=null && users.size()>0) {
return users.get(0);
}else {
return null;
}
} }

10.controller

package com.xiaog.controller;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping; import com.xiaog.entity.User;
import com.xiaog.service.UserService; @Controller
@RequestMapping("/user")
public class UserController { @Autowired
private UserService userService; private final static Logger logger = LoggerFactory.getLogger(UserController.class); @RequestMapping(value = "/login",params= {"username","password","username!=","password!="})
public String login(Model model,User user) {
user = userService.login(user);
logger.info("user="+user);
model.addAttribute("user", user);
return "result";
} }

11.测试登录的jsp页面

(1)index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="user/login" method="post">
<div>
<label>username</label>
<input type="text" name="username"/>
</div>
<div>
<label>password</label>
<input type="password" name="password"/>
</div>
<div>
<input type="submit" value="登录">
</div>
</form>
</body>
</html>

(2)result.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
username=${user}
</body>
</html>

12.启动项目

项目右击-->run as-->maven build->在Goals中填tomcat7:run,然后apply,run就启动项目了

浏览器输入http://localhost:9999/testssm

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