idea+springmvc+spring+mybatis+maven整合返回json数据webapi

首先看一张目录结构图：

：

创建步骤：

1.创建maven  webapp工程，

创建完后的目录结构为：

2.添加项目依赖(添加jar包)

需要的jar包：

spring-webmvc,

spring-test,

spring-orm，

commons-dbcp,

mybatis,

mybatis-spring,

mysql-connector-java,

commons-fileupload,

jstl,jackson-core,

jackson-databind,

jackson-mapper-asl,

cors-fiflter,(这个包为跨域访问的，不是必须的，前后端分离，为了方便测试，所以加上了。)

log4j,

slf4j-log4j12

添加这些依赖到pom.xml中，可以去这个网站搜索添加到maven:http://mvnrepository.com(PS:最后会发项目链接，大家也可以去我项目的pom.xml里面拷贝)

3、创建数据库：

下面是我的建表语句：

CREATE TABLE USERINFO(

`id` int NOT NULL AUTO_INCREMENT,

`username` varchar(50) NOT NULL,

`password` varchar(50) NOT NULL,

`nickname` varchar(50),

`user_picture` varchar(100),

`islogin` int,

`isactive` int,

`last_modeify` timestamp NULL,

`create_date` timestamp NULL,

`create_ip` varchar(50),

KEY(id),

PRIMARY KEY(username)

);

4.配置mybatis的generator插件：

这个插件可以自动生成mybatis的mapper,model,dao

在pom.xml的 build节点下添加如下：

 <!--mybatis 自动生成dao,model,mapper,generaotr插件-->
 <plugins>
     <plugin>
         <groupId>org.mybatis.generator</groupId>
         <artifactId>mybatis-generator-maven-plugin</artifactId>
         <version>1.3.2</version>
         <configuration>
             <verbose>true</verbose>
             <overwrite>true</overwrite>
         </configuration>
     </plugin>
 </plugins>

如图所示：

然后在目录结构下的src/main/resources中创建generatorConfig.xml:

此文件配置的是需要自动生成的文件的位置等信息，不懂得自行百度。

文件内容如下：

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>
    <!--引入配置文件-->
    <properties resource="config.properties"></properties>
    <!-- 数据库驱动包位置 -->
    <classPathEntry location="${jdbc.driverClassLocation}"/>
    <context id="default" targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>

        <!-- 数据库链接URL、用户名、密码 -->
        <jdbcConnection
                driverClass="${jdbc.driver}"
                connectionURL="${jdbc.url}"
                userId="${jdbc.username}"
                password="${jdbc.password}">
        </jdbcConnection>

        <!-- 非必需，类型处理器，在数据库类型和java类型之间的转换控制-->
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>

        <!-- Model模型生成器,用来生成含有主键key的类，记录类 以及查询Example类
            targetPackage     指定生成的model生成所在的包名
            targetProject     指定在该项目下所在的路径
        -->
        <javaModelGenerator targetPackage="com.ch.model"
                            targetProject="src/main/java">
            <!-- 是否允许子包，即targetPackage.schemaName.tableName -->
            <property name="enableSubPackages" value="true"/>
            <!-- 是否对model添加 构造函数 -->
            <property name="constructorBased" value="true"/>
            <!-- 是否对类CHAR类型的列的数据进行trim操作 -->
            <property name="trimStrings" value="true"/>
            <!-- 建立的Model对象是否 不可改变  即生成的Model对象不会有 setter方法，只有构造方法 -->
            <property name="immutable" value="false"/>
        </javaModelGenerator>

        <!--Mapper映射文件生成所在的目录 为每一个数据库的表生成对应的SqlMap文件 -->
        <sqlMapGenerator targetPackage="com.ch.mapping"
                         targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>

        <!-- 生成DAO的包名和位置 -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.ch.dao"
                             targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <!-- 要生成那些表(更改tableName和domainObjectName就可以) -->
        <table tableName="USERINFO" domainObjectName="Userinfo"
               enableCountByExample="false" enableUpdateByExample="false"
               enableDeleteByExample="false" enableSelectByExample="false"
               selectByExampleQueryId="false"/>
    </context>
</generatorConfiguration>
在resources目录下继续创建config.properties;
此文件是generator.xml中用到的数据库配置。内容如下：

接下来，点击idea右上角的

选择Edit Configurations,进入后，点击左上角的➕，选择maven

选择后，在Name出输入名字，任意都可以

在command line 中输入：

mybatis-generator:generate -e

然后点击Apply,OK.

接着，到src/main目录下，新建一个java目录，然后在此目录上点击右键把此目录作Sources Root，做完后，你会发现java目录变成了蓝色，如图：

然后，点击右上角的绿色小三角

在看看你的java目录下，

发现，自动生成了，mapping,model,dao的interface,致此，mybatis的文件生成完成。

5.整合spring,mybatis:

在resources目录下创建beans.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:mvc="http://www.springframework.org/schema/mvc"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"
       xsi:schemaLocation="http://www.springframework.org/schema/beans 
         http://www.springframework.org/schema/beans/spring-beans-3.0.xsd 
         http://www.springframework.org/schema/mvc 
         http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd 
         http://www.springframework.org/schema/context 
         http://www.springframework.org/schema/context/spring-context-3.0.xsd 
         http://www.springframework.org/schema/aop 
         http://www.springframework.org/schema/aop/spring-aop-3.0.xsd 
         http://www.springframework.org/schema/tx 
         http://www.springframework.org/schema/tx/spring-tx-3.0.xsd ">
    <!--载入配置文件-->
    <context:property-placeholder location="classpath:config.properties"/>

    <!--自动扫描service-->
    <context:component-scan base-package="com.ch.service,com.ch.dao"/>

    <!--mybatis数据源,这里用的是apache的dbcp-->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driver}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="testWhileIdle" value="true"/>
        <property name="testOnBorrow" value="true"/>
        <property name="testOnReturn" value="false"/>
        <property name="timeBetweenEvictionRunsMillis" value="30000"/>
        <property name="maxActive" value="30"/>
        <property name="minIdle" value="5"/>
        <property name="initialSize" value="5"/>

    </bean>

    <!--mybatis 核心类-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="configLocation" value="classpath:spring-mybatis.xml"/>
        <!--配置mybatis映射文件mapper的位置,如果配置文件在src/main/java目录下,maven默认不会编译,参考我pom.xml的,build,
             当然也可以放在resources目录下,那样就可以访问到-->
        <property name="mapperLocations" value="classpath*:com/ch/mapping/*.xml"/>
    </bean>

    <!--事物管理-->
    <bean id="txManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--事物通知-->
    <tx:advice id="txAdvice" transaction-manager = "txManager">
        <tx:attributes>
            <tx:method name="insert*" propagation="REQUIRED"/>
            <tx:method name="update*" propagation="REQUIRED"/>
            <tx:method name="delete*" propagation="REQUIRED"/>
            <tx:method name="save*" propagation="REQUIRED"/>

            <tx:method name="find*" read-only="true"/>
            <tx:method name="get*" read-only="true"/>
        </tx:attributes>
    </tx:advice>
</beans>
在创建spring-mybatis.xml,mybatis的配置文件为空，此处创建是为了留作以后扩展:

<?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>
</configuration>

至此，spring,mybatis整合完毕。

6.在java目录下创建controller包，service包，bean包

7.整合springmvc:
在resources目录下创建dispatcher-servlet.xml:

<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"
       xmlns:tx="http://www.springframework.org/schema/tx" xmlns:util="http://www.springframework.org/schema/util"
       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.xsd
       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd
       http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util.xsd">
    <!--可扫描注解的包-->
    <mvc:annotation-driven />
    <context:component-scan base-package="com.ch.controller"/>
    <!--视图解析器-->
    <bean id="jspViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!--<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>-->
        <property name="prefix" value="/WEB-INF/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

    <!--消息转换器-->
    <bean id="mappingJacksonHttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
        <property name="supportedMediaTypes">
            <list>
                <value>application/json;charset=UTF-8</value>
                <value>text/html;charset=UTF-8</value>
            </list>
        </property>
    </bean>

    <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter">
        <property name="messageConverters">
            <list>
                <ref bean="mappingJacksonHttpMessageConverter"/>
            </list>
        </property>
    </bean>

    
    <!--文件上传-->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize" value="10485760"/>
        <property name="defaultEncoding" value="UTF-8"/>
    </bean>
</beans>

然后修改/WEB-INF/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"
         xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
         xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
         id="WebApp_ID" version="3.0">
  <display-name>Archetype Created Web Application</display-name>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:beans.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>

  <servlet>
    <servlet-name>dispatcher-servlet</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:dispatcher-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>dispatcher-servlet</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>

  <!-- 3.编码过滤器，解决中文乱码 -->
  <filter>
    <filter-name>SpringEncoding</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>
  </filter>
  <filter-mapping>
    <filter-name>SpringEncoding</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

  <!--CORS跨域访问,不是必须,此处为方便前断测试,部署时最好删去-->
  <filter>
    <filter-name>CORS</filter-name>
    <filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class>
    <async-supported>true</async-supported>
    <init-param>
      <param-name>cors.allowOrigin</param-name>
      <param-value>*</param-value>
    </init-param>
    <init-param>
      <param-name>cors.supportedMethods</param-name>
      <param-value>GET, POST, HEAD, PUT, DELETE</param-value>
    </init-param>
    <init-param>
      <param-name>cors.supportedHeaders</param-name>
      <param-value>Accept, Origin, X-Requested-With, Content-Type, Last-Modified</param-value>
    </init-param>
    <init-param>
      <param-name>cors.exposedHeaders</param-name>
      <param-value>Set-Cookie</param-value>
    </init-param>
    <init-param>
      <param-name>cors.supportsCredentials</param-name>
      <param-value>true</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>CORS</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
</web-app>

至此，springmvc,spring整合完毕。

8.在dao包下创建impl包。然后在impl包下创建UserinfoMapperImpl继承SqlSessionDaoSupport实现UserinfoMapper

package com.ch.dao.impl;

import com.ch.dao.UserinfoMapper;
import com.ch.model.Userinfo;
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.support.SqlSessionDaoSupport;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;

/**
 * Created by apple on 2017/4/25.
 */
@Repository
public class UserinfoMapperImpl extends SqlSessionDaoSupport implements UserinfoMapper {
    @Autowired
    public void setSqlSessionFactory(SqlSessionFactory sqlSessionFactory){
        super.setSqlSessionFactory(sqlSessionFactory);
    }
    public int deleteByPrimaryKey(String username) {
        return 0;
    }

    public int insert(Userinfo record) {
        return 0;
    }

    public int insertSelective(Userinfo record) {
        return 0;
    }

    public Userinfo selectByPrimaryKey(String username) {
        return this.getSqlSession().selectOne("com.ch.dao.UserinfoMapper.selectByPrimaryKey",username);
    }

    public int updateByPrimaryKeySelective(Userinfo record) {
        return 0;
    }

    public int updateByPrimaryKey(Userinfo record) {
        return 0;
    }
}

千万别忘了在类上加上@Repository注解

9.新建service:
在service包下新建UserinfoService，因为处理的业务简单，这里直接拷贝UserinfoMapper的内容：

int deleteByPrimaryKey(String username);

int insert(Userinfo record);

int insertSelective(Userinfo record);

Userinfo selectByPrimaryKey(String username);

int updateByPrimaryKeySelective(Userinfo record);

int updateByPrimaryKey(Userinfo record);

继续在service包下新建impl包，在impl包中新建UserinfoServiceImpl实现UserinfoSerice:

package com.ch.service.impl;

import com.ch.dao.UserinfoMapper;
import com.ch.model.Userinfo;
import com.ch.service.UserinfoService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

/**
 * Created by apple on 2017/4/25.
 */
@Service
public class UserinfoServiceImpl implements UserinfoService {
    @Autowired
    UserinfoMapper userinfoMapper;
    public int deleteByPrimaryKey(String username) {
        return 0;
    }

    public int insert(Userinfo record) {
        return 0;
    }

    public int insertSelective(Userinfo record) {
        return 0;
    }

    public Userinfo selectByPrimaryKey(String username) {
        return userinfoMapper.selectByPrimaryKey(username);
    }

    public int updateByPrimaryKeySelective(Userinfo record) {
        return 0;
    }

    public int updateByPrimaryKey(Userinfo record) {
        return 0;
    }
}

千万别忘了在类上加上@Service注解


10.创建bean:
在bean包下新建类OBeanBase,此类为返回json数据的载体：

package com.ch.bean;

/**
 * Created by apple on 2017/4/25.
 */
public class OBeanBase {
    private String code;
    private String message;
    private Object contents;

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public Object getContents() {
        return contents;
    }

    public void setContents(Object contents) {
        this.contents = contents;
    }

    public void setInfo(String code,String message){
        this.message = message;
        this.code = code;
    }

    public OBeanBase(){}
}

继续在该包下创建类UserLoginIBean,此类为请求json数据自动转换的类

package com.ch.bean;

/**
 * Created by apple on 2017/4/25.
 */
public class UserLoginIBean {
    private String username;
    private String password;

    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;
    }
}

11.创建controller:

package com.ch.controller;

import com.ch.bean.OBeanBase;
import com.ch.bean.UserLoginIBean;
import com.ch.model.Userinfo;
import com.ch.service.UserinfoService;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * Created by apple on 2017/4/25.
 */
@Controller
@RequestMapping(value = "/user")
public class UserinfoController {
    @Autowired
    UserinfoService userinfoService;

    @ResponseBody
    @RequestMapping(value = "/login", method = RequestMethod.POST)
    public OBeanBase doLogin(@RequestBody UserLoginIBean userLoginIBean) {
        Logger logger = Logger.getLogger("DAO");
        OBeanBase carrier = new OBeanBase();
        Userinfo userinfo = userinfoService.selectByPrimaryKey(userLoginIBean.getUsername());
        if (userinfo != null) {
            if (userinfo.getPassword().equals(userLoginIBean.getPassword())) {
                System.out.println(userinfo.getNickname());
                carrier.setInfo("S01", "登录成功");
                logger.debug("登录成功");
                carrier.setContents(userinfo);
            } else {
                carrier.setInfo("E01", "密码错误");
            }
        } else {
            carrier.setInfo("E03", "无此账号");
        }
        return carrier;
    }
}

12.发布：
点击右上角的

选择Edit,添加tomcat:

填写Name,在ApplicationServer中选择自己的Tomcat，

接着点击Deployment,点击下角的➕，选择Artifacts

选择下面的war exploded

然后点击OK,APPLY,OK

12.在pom.xml中的build节点下加入：

       <!--java目录下xml文件默认不会打包,此处手动打包,否则报错-->
       <resources>
           <resource>
               <directory>src/main/java</directory>
               <includes>
                   <include>**/*.xml</include>
               </includes>
               <filtering>true</filtering>
           </resource>
       </resources>

然后点击启动Tomcat。

13，打开postman(谷歌的软件，要FQ去谷歌商店下载)测试API成功。发布。