SSM整合
作者：互联网
SSM整合
1.在数据库中创建表，并导入数据
sql语句
CREATE DATABASE wyy_music;
USE wyy_music;
DROP TABLE IF EXISTS `tb_music`;
CREATE TABLE `tb_music` (
`music_id` INT(11) PRIMARY KEY NOT NULL AUTO_INCREMENT, -- 歌曲ID
`music_name` VARCHAR(255) NOT NULL, -- 歌曲名称
`music_album_name` VARCHAR(255) NOT NULL, -- 专辑名称
`music_album_picUrl` VARCHAR(255) NOT NULL, -- 专辑图片路径
`music_mp3Url` VARCHAR(255) NOT NULL, -- 歌曲播放路径
`music_artist_name` VARCHAR(255) NOT NULL, -- 歌手名称
`sheet_id` INT(11) DEFAULT NULL -- 对应的歌单ID
) ENGINE=INNODB DEFAULT CHARSET=utf8;
INSERT INTO tb_music VALUES ('1', '光年之外', '光年之外', 'https://imgessl.kugou.com/stdmusic/20161229/20161229233400375274.jpg', 'https://webfs.tx.kugou.com/202109061310/31fb3f36e2048b2172a70e327bbfc8e3/KGTX/CLTX001/f87095bff0de7c636c3a3b8aac702d76.mp3', 'G.E.M.邓紫棋','1');
INSERT INTO tb_music VALUES ('2', '夜空中最亮的星', '世界', 'https://imgessl.kugou.com/stdmusic/20150719/20150719010047203836.jpg', 'https://webfs.ali.kugou.com/202109061306/1b30ae27a5749debd602507b3bf1fea6/G202/M04/1B/13/aocBAF55G0-ADd0HAD2Y88Efqbw072.mp3', '逃跑计划','1');
INSERT INTO tb_music VALUES ('3', '只要平凡', '只要平凡', 'https://imgessl.kugou.com/stdmusic/20180622/20180622194005815458.jpg', 'https://webfs.ali.kugou.com/202109061309/edb2e89d90e66b9d125950dba107e9eb/KGTX/CLTX001/38aead7ed546b0736791ebb25c3a3951.mp3', '张杰/张碧晨','2');
INSERT INTO tb_music VALUES ('4', '光年之外', '光年之外', 'https://imgessl.kugou.com/stdmusic/20161229/20161229233400375274.jpg', 'https://webfs.tx.kugou.com/202109061310/31fb3f36e2048b2172a70e327bbfc8e3/KGTX/CLTX001/f87095bff0de7c636c3a3b8aac702d76.mp3', 'G.E.M.邓紫棋','1');
INSERT INTO tb_music VALUES ('5', '夜空中最亮的星', '世界', 'https://imgessl.kugou.com/stdmusic/20150719/20150719010047203836.jpg', 'https://webfs.ali.kugou.com/202109061306/1b30ae27a5749debd602507b3bf1fea6/G202/M04/1B/13/aocBAF55G0-ADd0HAD2Y88Efqbw072.mp3', '逃跑计划','1');
INSERT INTO tb_music VALUES ('6', '只要平凡', '只要平凡', 'https://imgessl.kugou.com/stdmusic/20180622/20180622194005815458.jpg', 'https://webfs.ali.kugou.com/202109061309/edb2e89d90e66b9d125950dba107e9eb/KGTX/CLTX001/38aead7ed546b0736791ebb25c3a3951.mp3', '张杰/张碧晨','2');
DROP TABLE IF EXISTS `tb_sheet`;
CREATE TABLE `tb_sheet` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`sheet_name` varchar(255) NOT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;
INSERT INTO tb_sheet VALUES ('1', '热歌榜');
INSERT INTO tb_sheet VALUES ('2', '新歌榜');
INSERT INTO tb_sheet VALUES ('3', '原创榜');
2.创建web工程，导入依赖
<dependencies>
<!-- spring -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.3.20</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.3.20</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.9.9.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.3.20</version>
</dependency>
<!-- mybatis -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.9</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.7</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.29</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.9</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.24</version>
</dependency>
<!-- servlet -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
</dependency>
<!-- jackson -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.13.3</version>
</dependency>
<!-- 分页 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>5.3.0</version>
</dependency>
<!-- 日志 -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
</dependencies>
3.配置相关properties文件
3.1关联数据库db.properties
db.username = root
db.password = root
db.url = jdbc:mysql:///wyy_music?serverTimezone=Asia/Shanghai&characterEncoding=UTF8
db.driverClassName = com.mysql.cj.jdbc.Driver
3.2日志log4j.properties
# Global logging configuration
log4j.rootLogger=DEBUG, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
4.配置web.xml
<web-app>
<display-name>Archetype Created Web Application</display-name>
<!-- 考虑：spring相关配置文件的加载时机
spring配置文件的生命周期恰好和ServletContext对象的生命周期一致
-->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>
<!-- 用于加载applicationContext.xml -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!-- 前端控制器 -->
<servlet>
<servlet-name>dispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!-- 加载springmvc.xml -->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:springmvc.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
5.编写 applicationContext.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:aop="http://www.springframework.org/schema/aop"
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/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- bean definitions here -->
<!-- 导入外部配置文件 db.properties -->
<context:property-placeholder location="classpath:db.properties"></context:property-placeholder>
<!-- 配置数据源对象 -->
<bean id="datasource" class="com.alibaba.druid.pool.DruidDataSource">
<!-- 导入 db.properties 中的值-->
<property name="username" value="${db.username}"></property>
<property name="password" value="${db.password}"></property>
<property name="url" value="${db.url}"></property>
<property name="driverClassName" value="${db.driver}"></property>
</bean>
<!-- 扫描对应包下的注解 -->
<context:component-scan base-package="com.qf"></context:component-scan>
<!-- 配置sqlSessionFactory -->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 必选配置 -->
<property name="dataSource" ref="datasource"></property>
<!-- 非必选属性，根据自己需求去配置 -->
<!-- 导入 mybatis-config.xml -->
<property name="configLocation" value="classpath:mybatis-config.xml"></property>
<!-- 导入 Mapper.xml 文件，classpath后面不能有空格 -->
<property name="mapperLocations" value="classpath:mapper/*.xml"></property>
</bean>
<!-- 扫描 Mapper 接口，生成代理对象 -->
<bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 指定扫描的具体位置 -->
<property name="basePackage" value="com.qf.mapper"></property>
</bean>
</beans>
6.编写 springmvc.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
https://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc
https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 配置springmvc中的组件
我们用到的 映射器，适配器，解析器 这三个组件都已经帮我们创建好了
-->
<mvc:annotation-driven/>
<!-- 扫描包下的注解，只对 Controller 进行扫描，否则会覆盖 applicationContext.xml 已经扫描的内容 -->
<context:component-scan base-package="com.qf.controller"></context:component-scan>
<!-- 放行静态资源 -->
<mvc:default-servlet-handler></mvc:default-servlet-handler>
</beans>
7.编写 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>
<!-- 配置日志 -->
<settings>
<setting name="logImpl" value="LOG4J"/>
</settings>
</configuration>
8.编写实体类
Music
package com.qf.pojo;
import lombok.Data;
/**
* CREATE TABLE `tb_music` (
* `music_id` int(11) NOT NULL AUTO_INCREMENT, -- 歌曲ID
* `music_name` VARCHAR(255) NOT NULL, -- 歌曲名称
* `music_album_name` VARCHAR(255) NOT NULL, -- 专辑名称
* `music_album_picUrl` VARCHAR(255) NOT NULL, -- 专辑图片路径
* `music_mp3Url` VARCHAR(255) NOT NULL, -- 歌曲播放路径
* `music_artist_name` VARCHAR(255) NOT NULL, -- 歌手名称
* `sheet_id` int(11) DEFAULT NULL, -- 对应的歌单ID
* PRIMARY KEY (`music_id`)
* ) ENGINE=INNODB DEFAULT CHARSET=utf8;
*/
//歌曲
@Data
public class Music {
private Integer musicId;
private String musicName;
private String musicAlbumName;
private String musicAlbumPicurl;
private String musicMp3url;
private String musicArtistName;
private Integer sheetId;
}
9.编写Mapper接口
MusicMapper
package com.qf.mapper;
import com.qf.pojo.Music;
import org.springframework.stereotype.Repository;
import java.util.List;
@Repository
public interface MusicMapper {
/**
* 查询所有歌曲
* @return
*/
public List<Music> findAll();
}
10.编写Mapper.xml文件
MusicMapper.xml配置文件（ 注意：存放位置和applicationContext.xml中设置的对应上 ）
<?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.qf.mapper.MusicMapper">
<resultMap id="musicMap" type="com.qf.pojo.Music">
<id property="musicId" column="music_id"></id>
<result property="musicName" column="music_name"></result>
<result property="musicAlbumName" column="music_album_name"></result>
<result property="musicAlbumPicurl" column="music_album_picUrl"></result>
<result property="musicMp3url" column="music_mp3Url"></result>
<result property="musicArtistName" column="music_artist_name"></result>
<result property="sheetId" column="sheet_id"></result>
</resultMap>
<!-- sql判断 -->
<sql id="baseSql">
select music_id,
music_name,
music_album_name,
music_album_picUrl,
music_mp3Url,
music_artist_name,
sheet_id
from tb_music
</sql>
<!-- 查询所有歌曲 -->
<select id="findAll" resultMap="musicMap">
<include refid="baseSql"></include>
</select>
</mapper>
11.编写 Service
MusicService接口
package com.qf.service;
import com.qf.pojo.Music;
import java.util.List;
public interface MusicService {
/**
* 查询所有歌曲
* @return
*/
public List<Music> findAll();
}
12.编写ServiceImpl
MusicServiceImpl实现类
package com.qf.service.impl;
import com.qf.mapper.MusicMapper;
import com.qf.pojo.Music;
import com.qf.service.MusicService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
/**
* Service层，业务逻辑层
*/
@Service
public class MusicServiceImpl implements MusicService {
@Autowired
private MusicMapper musicMapper;
/**
* 实现查询所有歌曲
* @return
*/
@Override
public List<Music> findAll() {
return musicMapper.findAll();
}
}
13.编写Controller
MusicController
package com.qf.controller;
import com.qf.pojo.Music;
import com.qf.service.MusicService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;
@RestController
@RequestMapping("music")
public class MusicController {
@Autowired
private MusicService musicService;
/**
* 查询所有歌曲
* @return
*/
@RequestMapping("findAll")
public List<Music> findAll(){
return musicService.findAll();
}
}
14.测试
访问：localhost:8080/music/findAll 进行测试
15.多文件配置
首先设置之前的applicationContext.xml失效，在文件名后面加.bak -> applicationContext.xml.bak
15.1AOP配置
applicationContext-aop.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:aop="http://www.springframework.org/schema/aop"
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/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- bean definitions here -->
<!-- AOP配置（使用xml方式配置） -->
<!-- 配置通知 -->
<bean id="myAdvice" class="com.qf.advice.MyAdvice"></bean>
<!-- 配置aop -->
<aop:config>
<!-- 配置切点
expression：表达式，指定哪些方法是切入点，对那些进行增强
-->
<aop:pointcut id="pc" expression="execution(public * com.qf.service.impl.MusicServiceImpl.findAll())"/>
<!-- 配置切面，把通知配置到切点上 -->
<aop:aspect ref="myAdvice">
<!-- aop:before 前置通知，method 表示增强的代码的方法名 -->
<aop:before method="before" pointcut-ref="pc"></aop:before>
</aop:aspect>
</aop:config>
</beans>
MyAdvice
package com.qf.advice;
/**
* 通知类：增强的代码
* 方法名以及功能可以是任意的
*/
public class MyAdvice {
public void before(){
System.out.println("前置通知，目标对象调用方法前执行");
}
}
15.2事务配置
applicationContext-tx.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:aop="http://www.springframework.org/schema/aop"
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/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- bean definitions here -->
<!-- 配置数据源对象 -->
<bean id="datasource" class="com.alibaba.druid.pool.DruidDataSource">
<!-- 导入 db.properties 中的值-->
<property name="username" value="${db.username}"></property>
<property name="password" value="${db.password}"></property>
<property name="url" value="${db.url}"></property>
<property name="driverClassName" value="${db.driver}"></property>
</bean>
<!-- 配置事务（使用xml方式配置） -->
<!-- 事务平台管理器，封装了所有的事务操作，依赖数据源 -->
<bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="datasource"></property>
</bean>
<!-- 配置事务通知 -->
<tx:advice id="txAdvice" transaction-manager="transactionManager">
<!-- 对那些方法配置事务
isolation：用于指定事务的隔离级别。默认值是DEFAULT，表示使用数据库的默认隔离级别。
propagation：用于指定事务的传播行为。默认值是REQUIRED，表示一定会有事务，增删改的选择。查询方法可以选择SUPPORTS。
read-only：用于指定事务是否只读。只有查询方法才能设置为true。默认值是false，表示读写。
timeout：用于指定事务的超时时间，默认值是-1，表示永不超时。如果指定了数值，以秒为单位。
rollback-for：用于指定一个异常，当产生该异常时，事务回滚，产生其他异常时，事务不回滚。没有默认值。表示任何异常都回滚。
no-rollback-for：用于指定一个异常，当产生该异常时，事务不回滚，产生其他异常时事务回滚。没有默认值。表示任何异常都回滚。
-->
<tx:attributes>
<tx:method name="find*" isolation="REPEATABLE_READ" propagation="REQUIRED" read-only="true"/>
</tx:attributes>
</tx:advice>
<!-- 配置织入 -->
<aop:config>
<!-- 配置切点 -->
<aop:pointcut id="txPc" expression="execution( * com.qf.service.impl.*ServiceImpl.*(..))"/>
<!-- 配置切面 -->
<aop:advisor advice-ref="txAdvice" pointcut-ref="txPc"></aop:advisor>
</aop:config>
</beans>
15.3常规配置
applicationContext-bean.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:aop="http://www.springframework.org/schema/aop"
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/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- bean definitions here -->
<!-- 导入外部配置文件 db.properties -->
<context:property-placeholder location="classpath:db.properties"></context:property-placeholder>
<!-- 配置数据源对象 -->
<bean id="datasource" class="com.alibaba.druid.pool.DruidDataSource">
<!-- 导入 db.properties 中的值-->
<property name="username" value="${db.username}"></property>
<property name="password" value="${db.password}"></property>
<property name="url" value="${db.url}"></property>
<property name="driverClassName" value="${db.driver}"></property>
</bean>
<!-- 扫描对应包下的注解 -->
<context:component-scan base-package="com.qf"></context:component-scan>
<!-- 配置sqlSessionFactory -->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 必选配置 -->
<property name="dataSource" ref="datasource"></property>
<!-- 非必选属性，根据自己需求去配置 -->
<!-- 导入 mybatis-config.xml -->
<property name="configLocation" value="classpath:mybatis-config.xml"></property>
<!-- 导入 Mapper.xml 文件，classpath后面不能有空格 -->
<property name="mapperLocations" value="classpath:mapper/*.xml"></property>
</bean>
<!-- 扫描 Mapper 接口，生成代理对象 -->
<bean id="mapperScannerConfigurer" class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<!-- 指定扫描的具体位置 -->
<property name="basePackage" value="com.qf.mapper"></property>
</bean>
</beans>
15.4修改web.xml
<!-- 如果配置文件较多，可以采用通配符的方式去配置 -->
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath*:applicationContext-*.xml</param-value>
</context-param>
16.添加分页操作
16.1.导入依赖（之前已经导入）
<!-- 分页 -->
<dependency>
<groupId>com.github.pagehelper</groupId>
<artifactId>pagehelper</artifactId>
<version>5.3.0</version>
</dependency>
16.2配置分页插件（两种方式）
16.2.1 第一种：在 applicationContext.xml 中添加配置
<!-- 配置sqlSessionFactory -->
<bean id="sqlSessionFactoryBean" class="org.mybatis.spring.SqlSessionFactoryBean">
<!-- 必选配置 -->
<property name="dataSource" ref="datasource"></property>
<!-- 非必选属性，根据自己需求去配置 -->
<!-- 导入 mybatis-config.xml -->
<property name="configLocation" value="classpath:mybatis-config.xml"></property>
<!-- 导入 Mapper.xml 文件，classpath后面不能有空格 -->
<property name="mapperLocations" value="classpath:mapper/*.xml"></property>
<!-- 配置分页 -->
<!-- <property name="plugins">
<array>
<bean class="com.github.pagehelper.PageInterceptor">
<property name="properties">
<!–使用下面的方式配置参数，一行配置一个 –>
<value>
helperDialect = mysql
reasonable = true
supportMethodsArguments = true
</value>
</property>
</bean>
</array>
</property>-->
</bean>
16.2.2 第二种：在 mybatis-config.xml 中添加配置
<?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>
<!-- 配置日志 -->
<settings>
<setting name="logImpl" value="LOG4J"/>
</settings>
<!-- 分页插件 -->
<plugins>
<!-- com.github.pagehelper为PageHelper类所在包名 -->
<plugin interceptor="com.github.pagehelper.PageInterceptor">
<!-- 数据库方言，指定对应的数据库进行分页 -->
<property name="helperDialect" value="mysql"/>
<!-- 分页合理化参数，默认值为false。当该参数设置为 true 时，pageNum<=0 时会查询第一页， pageNum>pages（超过总数时），会查询最后一页 -->
<property name="reasonable" value="true"/>
<!-- 支持通过 Mapper 接口参数来传递分页参数 -->
<property name="supportMethodsArguments" value="true"/>
</plugin>
</plugins>
</configuration>
16.3在 controller 中添加方法
/**
* 分页
* @param pageNum
* @param pageSize
* @return
*/
// @RequestMapping("findByPage")
// public PageInfo findByPage(
// @RequestParam(value = "pageNum",required = false,defaultValue = "1") Integer pageNum,
// @RequestParam(value = "pageSize",required = false,defaultValue = "2") Integer pageSize
// ){
// //设置分页数据
// PageHelper.startPage(pageNum,pageSize);
// //查询所有
// List<Sheet> sheetList = sheetService.findAll();
// //封装PageInfo
// PageInfo<Sheet> sheetPageInfo = new PageInfo<>(sheetList);
// //返回
// return sheetPageInfo;
// }
/**
* 分页，返回值类型不同，需要先创建JsonResult
* @param pageNum
* @param pageSize
* @return
*/
@RequestMapping("findByPage")
public JsonResult<Sheet> findByPage(
@RequestParam(value = "pageNum",required = false,defaultValue = "1") Integer pageNum,
@RequestParam(value = "pageSize",required = false,defaultValue = "2") Integer pageSize
){
//设置分页数据
PageHelper.startPage(pageNum,pageSize);
//查询所有
List<Sheet> sheetList = sheetService.findAll();
//封装PageInfo
PageInfo<Sheet> sheetPageInfo = new PageInfo<>(sheetList);
//封装到JsonResult
if(null != sheetList){
JsonResult jsonResult = JsonResult.ok();
//返回分页数据
jsonResult.setData(sheetPageInfo.getList());
return jsonResult;
}
//throw new RuntimeException("歌单查询有误");
return JsonResult.fail();
}
16.4创建JsonResult
package com.qf.utils;
import lombok.Data;
/**
* 封装前端要求传递的数据格式
*/
@Data
public class JsonResult<T> {
private Integer code;
private String msg;
private T data;
/**
* 成功返回
* @return
*/
public static JsonResult ok(){
JsonResult jsonResult = new JsonResult();
jsonResult.setCode(200);
jsonResult.setMsg("success");
return jsonResult;
}
/**
* 失败返回
* @return
*/
public static JsonResult fail(){
JsonResult jsonResult = new JsonResult();
jsonResult.setCode(-2000);
jsonResult.setMsg("error");
return jsonResult;
}
}
标签：xml,--,SSM,music,整合,org,import,com 来源： https://www.cnblogs.com/qtyanan/p/16463713.html