搭建一个SSM环境

作者: 明月几何8 | 来源:发表于2019-10-25 22:13 被阅读0次

一个案例带你入门SSM框架开发
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项目结构

实体类TbMsg

package com.zhuliming.entity;

/**
 * 实体类
 */
public class TbMsg {

    private int id;
    private String name;
    private String msg;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    @Override
    public String toString() {
        return "TbMsg{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", msg='" + msg + '\'' +
                '}';
    }
}

DAO层接口

package com.zhuliming.dao;

import com.zhuliming.entity.TbMsg;

import java.util.List;

/**
 * Dao层
 */
public interface TbMsgDao {
    /**
     * 新增一条记录
     *
     * @param msg 实体对象
     * @return
     */
    public int addMsg(TbMsg msg);

    /**
     * 删除一条记录
     *
     * @param id id
     * @return
     */
    public int deleteMsg(int id);

    /**
     * 更新一条记录
     *
     * @param msg 实体对象
     * @return
     */
    public int updateMsg(TbMsg msg);

    /**
     * 查询全部
     *
     * @return
     */
    public List<TbMsg> queryAll();

}

DAO层映射文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.zhuliming.dao.TbMsgDao">

    <!--public int addMsg(TbMsg msg);-->
    <insert id="addMsg" parameterType="com.zhuliming.entity.TbMsg">
        insert into tb_msg(name, msg) values(#{name },#{msg})
    </insert>
    <!--public int deleteMsg(int id);-->
    <delete id="deleteMsg" parameterType="java.lang.Integer">
        delete from tb_msg where id = #{id}
    </delete>
    <!--public int updateMsg(TbMsg msg);-->
    <update id="updateMsg" parameterType="com.zhuliming.entity.TbMsg">
        update tb_msg set name=#{name }, msg=#{msg} where id=#{id}
    </update>
    <!--public List<TbMsg> queryAll();-->
    <select id="queryAll" resultType="com.zhuliming.entity.TbMsg">
        select id,name,msg from tb_msg
    </select>
</mapper>

Service层接口

package com.zhuliming.service;

import com.zhuliming.entity.TbMsg;

import java.util.List;

public interface TbMsgService {
    /**
     * 新增一条记录
     *
     * @param msg 实体对象
     * @return
     */
    public int addMsg(TbMsg msg);

    /**
     * 删除一条记录
     *
     * @param id id
     * @return
     */
    public int deleteMsg(int id);

    /**
     * 更新一条记录
     *
     * @param msg 实体对象
     * @return
     */
    public int updateMsg(TbMsg msg);

    /**
     * 查询全部
     *
     * @return
     */
    public List<TbMsg> queryAll();

}

Service层实现类

package com.zhuliming.service.impl;

import com.zhuliming.dao.TbMsgDao;
import com.zhuliming.entity.TbMsg;
import com.zhuliming.service.TbMsgService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
@Service
public class TbMsgServiceImpl implements TbMsgService {

    @Autowired
    private TbMsgDao tbMsgDao;

    public int addMsg(TbMsg msg) {
        return tbMsgDao.addMsg(msg);
    }

    public int deleteMsg(int id) {
        return tbMsgDao.deleteMsg(id);
    }

    public int updateMsg(TbMsg msg) {
        return tbMsgDao.updateMsg(msg);
    }

    public List<TbMsg> queryAll() {
        return tbMsgDao.queryAll();
    }
}

Controller层

package com.zhuliming.controller;

import com.zhuliming.entity.TbMsg;
import com.zhuliming.service.TbMsgService;
import com.zhuliming.utils.RestResponse;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TbMsgController {

    @Autowired
    private TbMsgService tbMsgService;

    @RequestMapping("/hello")
    public String showHello() {
        return "HelloWorld";
    }

    @RequestMapping("/addMsg")
    public RestResponse addMsg(TbMsg msg) {
        int row = tbMsgService.addMsg(msg);
        if (row > 0) {
            return RestResponse.success();
        }
        return RestResponse.error();
    }
}

RestResponse工具类

package com.zhuliming.utils;

public class RestResponse {

    private int code;
    private String msg;
    private Object Data;

    public int getCode() {
        return code;
    }

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

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Object getData() {
        return Data;
    }

    public void setData(Object data) {
        Data = data;
    }

    public RestResponse(int code, String msg) {
        this.code = code;
        this.msg = msg;
    }

    public static RestResponse success(){
        return new RestResponse(0,"success");
    }

    public static RestResponse success(String msg){
        return new RestResponse(0,msg);
    }

    public static RestResponse error(){
        return new RestResponse(1,"error");
    }

    public static RestResponse error(String msg){
        return new RestResponse(0,msg);
    }
}

依赖的包pom.xml

<?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.zhuliming</groupId>
    <artifactId>SSM-Demo</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>war</packaging>

    <dependencies>

        <!-- Spring WebMVC -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-webmvc</artifactId>
            <version>4.3.9.RELEASE</version>
        </dependency>

        <!-- MyBatis -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis</artifactId>
            <version>3.4.6</version>
        </dependency>

        <!-- MyBatis与Spring整合 -->
        <dependency>
            <groupId>org.mybatis</groupId>
            <artifactId>mybatis-spring</artifactId>
            <version>1.3.2</version>
        </dependency>

        <!-- Spring JDBC，版本需要与spring-webmvc保持一致 -->
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>4.3.9.RELEASE</version>
        </dependency>

        <!-- MySQL连接 -->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.13</version>
        </dependency>

        <!-- 数据库连接池 -->
        <dependency>
            <groupId>commons-dbcp</groupId>
            <artifactId>commons-dbcp</artifactId>
            <version>1.4</version>
        </dependency>

        <!-- Junit单元测试 -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.9</version>
        </dependency>

        <!-- Json转换器 -->
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
            <version>2.10.0</version>
        </dependency>

    </dependencies>

</project>

配置文件application.xml

<?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:context="http://www.springframework.org/schema/context"
       xmlns:util="http://www.springframework.org/schema/util"
       xmlns:tx="http://www.springframework.org/schema/tx"
       xmlns:aop="http://www.springframework.org/schema/aop"
       xmlns:jee="http://www.springframework.org/schema/jee"
       xmlns:mvc="http://www.springframework.org/schema/mvc"
       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
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd
        http://www.springframework.org/schema/util
        http://www.springframework.org/schema/util/spring-util.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
        http://www.springframework.org/schema/jee
        http://www.springframework.org/schema/jee/spring-jee.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    <!-- 注解驱动 -->
    <mvc:annotation-driven/>
    <!-- 组件扫描 -->
    <context:component-scan base-package="com.zhuliming"></context:component-scan>
    <!-- 视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/"></property>
        <property name="suffix" value=".jsp"></property>
    </bean>

    <!-- 拦截器 -->
<!--    <mvc:interceptors>
    <mvc:interceptor>
    <mvc:mapping path="/hello.do" />
    <bean class="cn.tedu.springmvc.interceptor.LoginInterceptor"></bean>
    </mvc:interceptor>
    </mvc:interceptors>-->

    <!-- 读取db.properties配置文件 -->
    <util:properties id="db" location="classpath:db.properties"></util:properties>
    <!-- 配置数据源 -->
    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
        <property name="driverClassName" value="#{db.driver}"></property>
        <property name="url" value="#{db.url}"></property>
        <property name="username" value="#{db.username}"></property>
        <property name="password" value="#{db.password}"></property>
        <property name="initialSize" value="#{db.initialSize}"></property>
        <property name="maxActive" value="#{db.maxActive}"></property>
    </bean>
    <!-- 指定数据源与XML映射的文件位置 -->
    <bean class="org.mybatis.spring.SqlSessionFactoryBean" id="sqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="mapperLocations" value="classpath:mappers/*.xml"></property>
    </bean>
    <!-- 指定接口文件在哪里 -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactoryBean"></property>
        <property name="basePackage" value="com.zhuliming.dao"></property>
    </bean>

</beans>

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_4_0.xsd"
         version="4.0">

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

    <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>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

配置文件mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="com.zhuliming.dao.TbMsgDao">

    <!--public int addMsg(TbMsg msg);-->
    <insert id="addMsg" parameterType="com.zhuliming.entity.TbMsg">
        insert into tb_msg(name, msg) values(#{name },#{msg})
    </insert>
    <!--public int deleteMsg(int id);-->
    <delete id="deleteMsg" parameterType="java.lang.Integer">
        delete from tb_msg where id = #{id}
    </delete>
    <!--public int updateMsg(TbMsg msg);-->
    <update id="updateMsg" parameterType="com.zhuliming.entity.TbMsg">
        update tb_msg set name=#{name }, msg=#{msg} where id=#{id}
    </update>
    <!--public List<TbMsg> queryAll();-->
    <select id="queryAll" resultType="com.zhuliming.entity.TbMsg">
        select id,name,msg from tb_msg
    </select>
</mapper>

配置文件db.properties

driver=com.mysql.cj.jdbc.Driver
url=jdbc:mysql://localhost:3306/db_case?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC
username=root
password=root
initialSize=3
maxActive=10

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