Spring+SpringMVC+MyBatis整合（山东数漫江湖）
2024-10-21 03:38:04
Spring+SpringMVC+MyBatis（SSM）在我们项目中是经常用到的，这篇文章主要讲解使用Intellij IDEA整合SSM，具体环境如下：
- 数据库：MySQL5.7
- 依赖管理：Maven
- IDE：Intellij IDEA
- JDK：1.8
- 服务器：Tomcat 9
首先用Intellij IDEA创建Maven项目，如果还不知道怎么创建的朋友可以先去百度谷歌，网上很多这种教程，这里我主要讲解SSM整合的过程，项目目录结构如下：
1.创建表，插入数据
CREATE TABLE user (
id INTEGER PRIMARY KEY AUTO_INCREMENT,
name CHAR(20) NOT NULL,
password CHAR(40) NOT NULL
)
ENGINE = InnoDB
AUTO_INCREMENT = 16
DEFAULT CHARSET = utf8;- 1
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INSERT INTO user (id,name, password) VALUES (1,'A', '123');
INSERT INTO user (id,name, password) VALUES (2,'B', '456');- 1
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2.添加Maven依赖
<?xml version="1.0" encoding="UTF-8"?>
<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.demo</groupId>
<artifactId>SSM</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>SSM</name>
<description/>
<properties>
<spring.version>4.3.4.RELEASE</spring.version>
<mybatis.version>3.4.2</mybatis.version>
<log4j.version>2.7</log4j.version>
<junit.version>4.12</junit.version>
<driver.version>5.1.40</driver.version>
</properties>
<dependencies>
<!--Spring start-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<!--绑定XML-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-oxm</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aspects</artifactId>
<version>${spring.version}</version>
</dependency>
<!--Spring end-->
<!--AOP start-->
<dependency>
<groupId>aopalliance</groupId>
<artifactId>aopalliance</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.10</version>
</dependency>
<!--AOP end-->
<!--文件上传start-->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.3.2</version>
</dependency>
<!--文件上传end-->
<!--json start-->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.8.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.4</version>
</dependency>
<!--json end-->
<!--mybatis start-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.2</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.1</version>
</dependency>
<!--mybatis end-->
<!--log start-->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>${log4j.version}</version>
</dependency>
<!--log end-->
<!--单元测试start-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
</dependency>
<!--单元测试end-->
<!--数据库驱动start-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.40</version>
</dependency>
<!--数据库驱动end-->
<!--druid start-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.29</version>
</dependency>
<!--druid end-->
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<!--MBG-->
<plugin>
<groupId>org.mybatis.generator</groupId>
<artifactId>mybatis-generator-maven-plugin</artifactId>
<version>1.3.5</version>
<configuration>
<verbose>true</verbose>
<overwrite>true</overwrite>
</configuration>
</plugin>
</plugins>
</build>
</project>- 1
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代码都加了注释，很容易看懂。需要说一下的是MBG，全称是MyBatis Generator，是一个生成MyBatis代码的插件，后面会用到。具体可以看看 MyBatis Generator官方文档
3.配置文件
3.1 Mybatis配置文件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>
</configuration>- 1
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3.2 数据库配置文件database.properties
db.driver=com.mysql.jdbc.Driver
db.url=jdbc:mysql://localhost:3306/mybatis?characterEncoding=UTF-8
db.user=root
db.password=123456
db.maxActive=10
db.initialSize=2
db.minIdle=2
db.maxWait=60000
db.timeBetweenEvictionRunsMillis=3000
db.minEvictableIdleTimeMillis=300000
db.validationQuery=SELECT 'x' FROM DUAL
db.testWhileIdle=true
db.testOnBorrow=false
db.testOnReturn=false- 1
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3.3 Spring配置文件application.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<import resource="classpath:spring/spring-mybatis.xml"/>
</beans>- 1
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这里为了方便项目扩展，用import标签引入另一个配置文件spring-mybatis.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:tx="http://www.springframework.org/schema/tx"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="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.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="classpath:properties/database.properties"/>
<!--数据源配置-->
<bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close">
<!--驱动-->
<property name="driverClassName" value="${db.driver}"/>
<!-- 数据库地址 -->
<property name="url" value="${db.url}"/>
<!-- 用户名 -->
<property name="username" value="${db.user}"/>
<!-- 密码 -->
<property name="password" value="${db.password}"/>
<!-- 最大连接池数量 -->
<property name="maxActive" value="${db.maxActive}"/>
<!-- 初始化物理连接个数 -->
<property name="initialSize" value="${db.initialSize}"/>
<!-- 最小连接池数量 -->
<property name="minIdle" value="${db.minIdle}"/>
<!-- 最大等待时间 -->
<property name="maxWait" value="${db.maxWait}"/>
<property name="timeBetweenEvictionRunsMillis" value="${db.timeBetweenEvictionRunsMillis}"/>
<property name="minEvictableIdleTimeMillis" value="${db.minEvictableIdleTimeMillis}"/>
<!-- 检测连接是否有效的SQL -->
<property name="validationQuery" value="${db.validationQuery}"/>
<property name="testWhileIdle" value="${db.testWhileIdle}"/>
<!-- 申请连接时是否执行validationQuery -->
<property name="testOnBorrow" value="${db.testOnBorrow}"/>
<!-- 归还连接时是否执行validationQuery -->
<property name="testOnReturn" value="${db.testOnReturn}"/>
</bean>
<!-- 配置Mybatis的文件 ，mapperLocations配置**Mapper.xml文件位置，configLocation配置mybatis-config文件位置-->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="mapperLocations" value="classpath:mapper/*.xml"/>
<property name="configLocation" value="classpath:mybatis/mybatis-config.xml"/>
</bean>
<!-- 自动扫描了所有的XxxxMapper.xml对应的mapper接口文件，这样就不用一个一个手动配置Mpper的映射了，
只要Mapper接口类和Mapper映射文件对应起来就可以了 -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.demo.dao"/>
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
</bean>
<!-- 事物管理器 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource"/>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
</beans>- 1
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3.4 SpringMVC配置文件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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
<!-- 注解的支持，可以将请求参数绑定到控制器参数-->
<mvc:annotation-driven/>
<!--注解扫描-->
<context:component-scan base-package="com.demo.controller"/>
<context:component-scan base-package="com.demo.serviceImpl"/>
<!--静态资源处理，mapping：匹配URL，location：静态资源在WebApp中的位置-->
<mvc:resources mapping="/common/**" location="/common/"/>
<mvc:resources mapping="/css/**" location="/css/"/>
<mvc:resources mapping="/image/**" location="/image/"/>
<mvc:resources mapping="/js/**" location="/js/"/>
<!-- 注解的映射器 -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"/>
<!-- 注解的适配器 -->
<bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"/>
<!-- 视图解析器 -->
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="contentType" value="text/html"/>
<property name="prefix" value="/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
<!--上传文件配置-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<!-- 默认编码 -->
<property name="defaultEncoding" value="UTF-8"/>
<!-- 启用是为了推迟文件解析，以便捕获文件大小异常 -->
<property name="resolveLazily" value="true"/>
<!-- 文件大小最大值 -->
<property name="maxUploadSize" value="209715200"/>
<!-- 内存中的最大值 -->
<property name="maxInMemorySize" value="40960"/>
</bean>
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3.5 log4j配置文件log4j.xml
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />
</Console>
</Appenders>
<Loggers>
<Root level="debug">
<AppenderRef ref="Console" />
</Root>
</Loggers>
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3.6 MyBatis Generator配置文件generatorConfig.xml
<?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>
<!--数据库驱动-->
<classPathEntry
location="C:/Users/Administrator/.m2/repository/mysql/mysql-connector-java/5.1.40/mysql-connector-java-5.1.40.jar"/>
<context id="mybatis" targetRuntime="MyBatis3">
<!-- 防止生成的代码中有很多注释-->
<commentGenerator>
<property name="suppressAllComments" value="true"/>
<property name="suppressDate" value="true"/>
</commentGenerator>
<jdbcConnection driverClass="com.mysql.jdbc.Driver"
connectionURL="jdbc:mysql://localhost:3306/mybatis"
userId="root"
password="199498xy">
</jdbcConnection>
<!--Java类型解析器不应该强制型对象字段BigDecimal的使用，此功能是为了使数据库DECIMAL和NUMERIC列容易处理-->
<javaTypeResolver>
<property name="forceBigDecimals" value="false"/>
</javaTypeResolver>
<!--生成Model类存放位置-->
<javaModelGenerator targetPackage="com.demo.bean" targetProject="E:/workspace/java/project/SSM/src/main/java">
<property name="enableSubPackages" value="true"/>
<property name="trimStrings" value="true"/>
</javaModelGenerator>
<!--生成映射文件存放位置-->
<sqlMapGenerator targetPackage="mapper" targetProject="E:/workspace/java/project/SSM/src/main/resources">
<property name="enableSubPackages" value="true"/>
</sqlMapGenerator>
<!--生成Dao类存放位置-->
<javaClientGenerator type="XMLMAPPER" targetPackage="com.demo.dao" targetProject="E:/workspace/java/project/SSM/src/main/java">
<property name="enableSubPackages" value="true"/>
</javaClientGenerator>
<!--生成对应表及类名-->
<table tableName="user" domainObjectName="User"/>
</context>
</generatorConfiguration>- 1
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命令行运行maven命令
mvn mybatis-generator:generate- 1
生成User表的Mapper.xml文件、bean和对应的接口，bean和接口下面会说到
<?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.demo.dao.UserMapper">
<resultMap id="BaseResultMap" type="com.demo.bean.User">
<id column="id" jdbcType="INTEGER" property="id" />
<result column="name" jdbcType="CHAR" property="name" />
<result column="password" jdbcType="CHAR" property="password" />
</resultMap>
<sql id="Example_Where_Clause">
<where>
<foreach collection="oredCriteria" item="criteria" separator="or">
<if test="criteria.valid">
<trim prefix="(" prefixOverrides="and" suffix=")">
<foreach collection="criteria.criteria" item="criterion">
<choose>
<when test="criterion.noValue">
and ${criterion.condition}
</when>
<when test="criterion.singleValue">
and ${criterion.condition} #{criterion.value}
</when>
<when test="criterion.betweenValue">
and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
</when>
<when test="criterion.listValue">
and ${criterion.condition}
<foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
#{listItem}
</foreach>
</when>
</choose>
</foreach>
</trim>
</if>
</foreach>
</where>
</sql>
<sql id="Update_By_Example_Where_Clause">
<where>
<foreach collection="example.oredCriteria" item="criteria" separator="or">
<if test="criteria.valid">
<trim prefix="(" prefixOverrides="and" suffix=")">
<foreach collection="criteria.criteria" item="criterion">
<choose>
<when test="criterion.noValue">
and ${criterion.condition}
</when>
<when test="criterion.singleValue">
and ${criterion.condition} #{criterion.value}
</when>
<when test="criterion.betweenValue">
and ${criterion.condition} #{criterion.value} and #{criterion.secondValue}
</when>
<when test="criterion.listValue">
and ${criterion.condition}
<foreach close=")" collection="criterion.value" item="listItem" open="(" separator=",">
#{listItem}
</foreach>
</when>
</choose>
</foreach>
</trim>
</if>
</foreach>
</where>
</sql>
<sql id="Base_Column_List">
id, name, password
</sql>
<select id="selectByExample" parameterType="com.demo.bean.UserExample" resultMap="BaseResultMap">
select
<if test="distinct">
distinct
</if>
<include refid="Base_Column_List" />
from user
<if test="_parameter != null">
<include refid="Example_Where_Clause" />
</if>
<if test="orderByClause != null">
order by ${orderByClause}
</if>
</select>
<select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">
select
<include refid="Base_Column_List" />
from user
where id = #{id,jdbcType=INTEGER}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
delete from user
where id = #{id,jdbcType=INTEGER}
</delete>
<delete id="deleteByExample" parameterType="com.demo.bean.UserExample">
delete from user
<if test="_parameter != null">
<include refid="Example_Where_Clause" />
</if>
</delete>
<insert id="insert" parameterType="com.demo.bean.User">
insert into user (id, name, password)
values (#{id,jdbcType=INTEGER}, #{name,jdbcType=CHAR}, #{password,jdbcType=CHAR})
</insert>
<insert id="insertSelective" parameterType="com.demo.bean.User">
insert into user
<trim prefix="(" suffix=")" suffixOverrides=",">
<if test="id != null">
id,
</if>
<if test="name != null">
name,
</if>
<if test="password != null">
password,
</if>
</trim>
<trim prefix="values (" suffix=")" suffixOverrides=",">
<if test="id != null">
#{id,jdbcType=INTEGER},
</if>
<if test="name != null">
#{name,jdbcType=CHAR},
</if>
<if test="password != null">
#{password,jdbcType=CHAR},
</if>
</trim>
</insert>
<select id="countByExample" parameterType="com.demo.bean.UserExample" resultType="java.lang.Long">
select count(*) from user
<if test="_parameter != null">
<include refid="Example_Where_Clause" />
</if>
</select>
<update id="updateByExampleSelective" parameterType="map">
update user
<set>
<if test="record.id != null">
id = #{record.id,jdbcType=INTEGER},
</if>
<if test="record.name != null">
name = #{record.name,jdbcType=CHAR},
</if>
<if test="record.password != null">
password = #{record.password,jdbcType=CHAR},
</if>
</set>
<if test="_parameter != null">
<include refid="Update_By_Example_Where_Clause" />
</if>
</update>
<update id="updateByExample" parameterType="map">
update user
set id = #{record.id,jdbcType=INTEGER},
name = #{record.name,jdbcType=CHAR},
password = #{record.password,jdbcType=CHAR}
<if test="_parameter != null">
<include refid="Update_By_Example_Where_Clause" />
</if>
</update>
<update id="updateByPrimaryKeySelective" parameterType="com.demo.bean.User">
update user
<set>
<if test="name != null">
name = #{name,jdbcType=CHAR},
</if>
<if test="password != null">
password = #{password,jdbcType=CHAR},
</if>
</set>
where id = #{id,jdbcType=INTEGER}
</update>
<update id="updateByPrimaryKey" parameterType="com.demo.bean.User">
update user
set name = #{name,jdbcType=CHAR},
password = #{password,jdbcType=CHAR}
where id = #{id,jdbcType=INTEGER}
</update>
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3.7 web配置文件web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<!-- 起始欢迎界面 -->
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<!-- 错误跳转页面 -->
<error-page>
<!-- 路径不正确 -->
<error-code>404</error-code>
<location>/error/404.jsp</location>
</error-page>
<error-page>
<!-- 没有访问权限，访问被禁止 -->
<error-code>405</error-code>
<location>/error/405.jsp</location>
</error-page>
<error-page>
<!-- 内部错误 -->
<error-code>500</error-code>
<location>/error/500.jsp</location>
</error-page>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:application.xml</param-value>
</context-param>
<!-- Spring字符集过滤器 -->
<filter>
<filter-name>SpringEncodingFilter</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>SpringEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring/spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
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4.接口和类
4.1 com.demo.bean下的User.java和UserExample.java
这两个类是由MBG生成的
package com.demo.bean;
public class User {
private Integer id;
private String name;
private String password;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name == null ? null : name.trim();
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password == null ? null : password.trim();
}
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Example类用于构造复杂的筛选条件
package com.demo.bean;
import java.util.ArrayList;
import java.util.List;
public class UserExample {
protected String orderByClause;
protected boolean distinct;
protected List<Criteria> oredCriteria;
public UserExample() {
oredCriteria = new ArrayList<Criteria>();
}
public void setOrderByClause(String orderByClause) {
this.orderByClause = orderByClause;
}
public String getOrderByClause() {
return orderByClause;
}
public void setDistinct(boolean distinct) {
this.distinct = distinct;
}
public boolean isDistinct() {
return distinct;
}
public List<Criteria> getOredCriteria() {
return oredCriteria;
}
public void or(Criteria criteria) {
oredCriteria.add(criteria);
}
public Criteria or() {
Criteria criteria = createCriteriaInternal();
oredCriteria.add(criteria);
return criteria;
}
public Criteria createCriteria() {
Criteria criteria = createCriteriaInternal();
if (oredCriteria.size() == 0) {
oredCriteria.add(criteria);
}
return criteria;
}
protected Criteria createCriteriaInternal() {
Criteria criteria = new Criteria();
return criteria;
}
public void clear() {
oredCriteria.clear();
orderByClause = null;
distinct = false;
}
protected abstract static class GeneratedCriteria {
protected List<Criterion> criteria;
protected GeneratedCriteria() {
super();
criteria = new ArrayList<Criterion>();
}
public boolean isValid() {
return criteria.size() > 0;
}
public List<Criterion> getAllCriteria() {
return criteria;
}
public List<Criterion> getCriteria() {
return criteria;
}
protected void addCriterion(String condition) {
if (condition == null) {
throw new RuntimeException("Value for condition cannot be null");
}
criteria.add(new Criterion(condition));
}
protected void addCriterion(String condition, Object value, String property) {
if (value == null) {
throw new RuntimeException("Value for " + property + " cannot be null");
}
criteria.add(new Criterion(condition, value));
}
protected void addCriterion(String condition, Object value1, Object value2, String property) {
if (value1 == null || value2 == null) {
throw new RuntimeException("Between values for " + property + " cannot be null");
}
criteria.add(new Criterion(condition, value1, value2));
}
public Criteria andIdIsNull() {
addCriterion("id is null");
return (Criteria) this;
}
public Criteria andIdIsNotNull() {
addCriterion("id is not null");
return (Criteria) this;
}
public Criteria andIdEqualTo(Integer value) {
addCriterion("id =", value, "id");
return (Criteria) this;
}
public Criteria andIdNotEqualTo(Integer value) {
addCriterion("id <>", value, "id");
return (Criteria) this;
}
public Criteria andIdGreaterThan(Integer value) {
addCriterion("id >", value, "id");
return (Criteria) this;
}
public Criteria andIdGreaterThanOrEqualTo(Integer value) {
addCriterion("id >=", value, "id");
return (Criteria) this;
}
public Criteria andIdLessThan(Integer value) {
addCriterion("id <", value, "id");
return (Criteria) this;
}
public Criteria andIdLessThanOrEqualTo(Integer value) {
addCriterion("id <=", value, "id");
return (Criteria) this;
}
public Criteria andIdIn(List<Integer> values) {
addCriterion("id in", values, "id");
return (Criteria) this;
}
public Criteria andIdNotIn(List<Integer> values) {
addCriterion("id not in", values, "id");
return (Criteria) this;
}
public Criteria andIdBetween(Integer value1, Integer value2) {
addCriterion("id between", value1, value2, "id");
return (Criteria) this;
}
public Criteria andIdNotBetween(Integer value1, Integer value2) {
addCriterion("id not between", value1, value2, "id");
return (Criteria) this;
}
public Criteria andNameIsNull() {
addCriterion("name is null");
return (Criteria) this;
}
public Criteria andNameIsNotNull() {
addCriterion("name is not null");
return (Criteria) this;
}
public Criteria andNameEqualTo(String value) {
addCriterion("name =", value, "name");
return (Criteria) this;
}
public Criteria andNameNotEqualTo(String value) {
addCriterion("name <>", value, "name");
return (Criteria) this;
}
public Criteria andNameGreaterThan(String value) {
addCriterion("name >", value, "name");
return (Criteria) this;
}
public Criteria andNameGreaterThanOrEqualTo(String value) {
addCriterion("name >=", value, "name");
return (Criteria) this;
}
public Criteria andNameLessThan(String value) {
addCriterion("name <", value, "name");
return (Criteria) this;
}
public Criteria andNameLessThanOrEqualTo(String value) {
addCriterion("name <=", value, "name");
return (Criteria) this;
}
public Criteria andNameLike(String value) {
addCriterion("name like", value, "name");
return (Criteria) this;
}
public Criteria andNameNotLike(String value) {
addCriterion("name not like", value, "name");
return (Criteria) this;
}
public Criteria andNameIn(List<String> values) {
addCriterion("name in", values, "name");
return (Criteria) this;
}
public Criteria andNameNotIn(List<String> values) {
addCriterion("name not in", values, "name");
return (Criteria) this;
}
public Criteria andNameBetween(String value1, String value2) {
addCriterion("name between", value1, value2, "name");
return (Criteria) this;
}
public Criteria andNameNotBetween(String value1, String value2) {
addCriterion("name not between", value1, value2, "name");
return (Criteria) this;
}
public Criteria andPasswordIsNull() {
addCriterion("password is null");
return (Criteria) this;
}
public Criteria andPasswordIsNotNull() {
addCriterion("password is not null");
return (Criteria) this;
}
public Criteria andPasswordEqualTo(String value) {
addCriterion("password =", value, "password");
return (Criteria) this;
}
public Criteria andPasswordNotEqualTo(String value) {
addCriterion("password <>", value, "password");
return (Criteria) this;
}
public Criteria andPasswordGreaterThan(String value) {
addCriterion("password >", value, "password");
return (Criteria) this;
}
public Criteria andPasswordGreaterThanOrEqualTo(String value) {
addCriterion("password >=", value, "password");
return (Criteria) this;
}
public Criteria andPasswordLessThan(String value) {
addCriterion("password <", value, "password");
return (Criteria) this;
}
public Criteria andPasswordLessThanOrEqualTo(String value) {
addCriterion("password <=", value, "password");
return (Criteria) this;
}
public Criteria andPasswordLike(String value) {
addCriterion("password like", value, "password");
return (Criteria) this;
}
public Criteria andPasswordNotLike(String value) {
addCriterion("password not like", value, "password");
return (Criteria) this;
}
public Criteria andPasswordIn(List<String> values) {
addCriterion("password in", values, "password");
return (Criteria) this;
}
public Criteria andPasswordNotIn(List<String> values) {
addCriterion("password not in", values, "password");
return (Criteria) this;
}
public Criteria andPasswordBetween(String value1, String value2) {
addCriterion("password between", value1, value2, "password");
return (Criteria) this;
}
public Criteria andPasswordNotBetween(String value1, String value2) {
addCriterion("password not between", value1, value2, "password");
return (Criteria) this;
}
}
public static class Criteria extends GeneratedCriteria {
protected Criteria() {
super();
}
}
public static class Criterion {
private String condition;
private Object value;
private Object secondValue;
private boolean noValue;
private boolean singleValue;
private boolean betweenValue;
private boolean listValue;
private String typeHandler;
public String getCondition() {
return condition;
}
public Object getValue() {
return value;
}
public Object getSecondValue() {
return secondValue;
}
public boolean isNoValue() {
return noValue;
}
public boolean isSingleValue() {
return singleValue;
}
public boolean isBetweenValue() {
return betweenValue;
}
public boolean isListValue() {
return listValue;
}
public String getTypeHandler() {
return typeHandler;
}
protected Criterion(String condition) {
super();
this.condition = condition;
this.typeHandler = null;
this.noValue = true;
}
protected Criterion(String condition, Object value, String typeHandler) {
super();
this.condition = condition;
this.value = value;
this.typeHandler = typeHandler;
if (value instanceof List<?>) {
this.listValue = true;
} else {
this.singleValue = true;
}
}
protected Criterion(String condition, Object value) {
this(condition, value, null);
}
protected Criterion(String condition, Object value, Object secondValue, String typeHandler) {
super();
this.condition = condition;
this.value = value;
this.secondValue = secondValue;
this.typeHandler = typeHandler;
this.betweenValue = true;
}
protected Criterion(String condition, Object value, Object secondValue) {
this(condition, value, secondValue, null);
}
}
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4.2 com.demo.dao下的UserMapper.java
这个DAO也是MBG生成的，这下体会到MBG的好处了吧，一下子帮你生成了这么多代码，年轻人可以少熬点夜了~
package com.demo.dao;
import com.demo.bean.User;
import com.demo.bean.UserExample;
import java.util.List;
import org.apache.ibatis.annotations.Param;
public interface UserMapper {
long countByExample(UserExample example);
int deleteByExample(UserExample example);
int deleteByPrimaryKey(Integer id);
int insert(User record);
int insertSelective(User record);
List<User> selectByExample(UserExample example);
User selectByPrimaryKey(Integer id);
int updateByExampleSelective(@Param("record") User record, @Param("example") UserExample example);
int updateByExample(@Param("record") User record, @Param("example") UserExample example);
int updateByPrimaryKeySelective(User record);
int updateByPrimaryKey(User record);
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4.3 com.demo.service下的UserService.java接口
这里只定义了简单的增删查改方法
package com.demo.service;
import com.demo.bean.User;
import java.util.List;
public interface UserService {
void insertUser(User user);
void deleteUser(int id);
User findUserById(Integer id);
List<User> findAllUsers();
void updateUser(User user);
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4.4 com.demo.serviceImpl下的UserServiceImpl.java
UserServiceImpl实现了UserService，通过注入UserMapper 对数据进行操作
package com.demo.serviceImpl;
import com.demo.bean.User;
import com.demo.bean.UserExample;
import com.demo.dao.UserMapper;
import com.demo.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserServiceImpl implements UserService {
@Autowired
private UserMapper userMapper;
@Override
public void insertUser(User user) {
userMapper.insert(user);
}
@Override
public void deleteUser(int id) {
UserExample userExample = new UserExample();
userExample.createCriteria().andIdEqualTo(id);
userMapper.deleteByExample(userExample);
}
@Override
public User findUserById(Integer id) {
return userMapper.selectByPrimaryKey(id);
}
@Override
public List<User> findAllUsers() {
return userMapper.selectByExample(null);
}
@Override
public void updateUser(User user) {
userMapper.updateByPrimaryKey(user);
}
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4.5 com.demo.controller下的UserController.java
MVC模式下的控制器，通过注入的UserService完成相关业务
package com.demo.controller;
import com.demo.bean.User;
import com.demo.service.UserService;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
@RequestMapping(value = "/user")
public class UserController {
private static Logger logger = LogManager.getLogger();
@Autowired
private UserService userService;
@RequestMapping(value = "/{id}", method = RequestMethod.GET)
@ResponseBody
public User findUserById(@PathVariable("id") Integer id) {
User user = userService.findUserById(id);
logger.info(user.toString());
return user;
}
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5.测试
将项目部署到本地的Tomcat上，打开你的chrome，访问：
http://localhost:8080/user/1- 1
浏览器访问服务器，服务器成功返回一个json数据
ok，到这里我们整个SSM整合过程已经完成，后面只要在这个基础上开发就可以了。github项目地址，欢迎star和fork~
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