IDEA整合SSM框架
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编程语言 Java

IDEA整合SSM框架

科长
科长
2023-07-06 / 0 评论 / 100 阅读 / 正在检测是否收录...

创建项目

打开IDEA-File-Project

image-20230706134755453

项目大致目录

image-20230706135118502

项目目录类型

image-20230706135459469

修改pom.xml添加maven依赖

  <properties>
    <!-- 设置项目编码编码 -->
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <!-- spring版本号 -->
    <spring.version>4.3.5.RELEASE</spring.version>
    <!-- mybatis版本号 -->
    <mybatis.version>3.4.1</mybatis.version>
  </properties>


  <dependencies>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>jstl</artifactId>
      <version>1.2</version>
    </dependency>
    
    <dependency>
      <groupId>org.apache.taglibs</groupId>
      <artifactId>taglibs-standard-impl</artifactId>
      <version>1.2.5</version>
    </dependency>

    <!-- 实现slf4j接口并整合 -->
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-api</artifactId>
      <version>1.7.30</version>
    </dependency>
    
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-classic</artifactId>
      <version>1.2.2</version>
    </dependency>
    
    <dependency>
      <groupId>ch.qos.logback</groupId>
      <artifactId>logback-core</artifactId>
      <version>1.2.3</version>
    </dependency>

    <!-- JSON -->
    <dependency>
      <groupId>com.fasterxml.jackson.core</groupId>
      <artifactId>jackson-databind</artifactId>
      <version>2.8.7</version>
    </dependency>
    
    <!-- mysql -->
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.25</version>
      <scope>runtime</scope>
    </dependency>
    
        <!-- 数据源 -->
    <dependency>
      <groupId>com.mchange</groupId>
      <artifactId>c3p0</artifactId>
      <version>0.9.5.2</version>
    </dependency>

    <!-- MyBatis -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>${mybatis.version}</version>
    </dependency>

    <!-- mybatis/spring整合包 -->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.1</version>
    </dependency>

    <!-- Spring -->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-beans</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-tx</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>${spring.version}</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-test</artifactId>
      <version>${spring.version}</version>
    </dependency>

    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>

  <build>
    <finalName>spring-ssm</finalName>
  </build>

配置DispatcherServlet

有关DispatcherServlet前端控制器的文章可以查看SpringMVC之DispatcherServlet前置控制器

编辑web.xml

<!DOCTYPE web-app PUBLIC
        "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
        "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
    <display-name>ssm</display-name>
    <!--添加防止乱码的过滤器-->
    <filter>
        <!--过滤器名称-->
        <filter-name>SetCharacterEncoding</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <!--设置CharacterEncodingFilter属性-->
        <!--encoding属性-->
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <!--forceEncoding属性-->
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>

    <!--映射过滤器-->
    <filter-mapping>
        <!--使用哪个过滤器-->
        <filter-name>SetCharacterEncoding</filter-name>
        <!--配置全局路由需要使用这个过滤器-->
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <!--配置 DispatcherServlet 调度器-->
    <servlet>
        <servlet-name>SpringMVC</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
         <!--初始化 DispatcherServlet-->
                 <!-- SpringMVC通过web.xml文件中servlet标签下的DispatcherServlet类完成自身的初始化-->
        <init-param>
            <param-name>contextConfigLocation</param-name>
            <param-value>classpath:spring-*.xml</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>
    <!--映射所有请求到 DispatcherServlet 调度器-->
    <servlet-mapping>
        <servlet-name>SpringMVC</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
    <!-- 默认首页   -->
    <welcome-file-list>
        <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
</web-app>

在这里提一嘴，很多同学不太明白拦截器和过滤器的区别，现在跟大家解释一下两者的区别：

  1. 拦截器是基于Java的反射机制的，而过滤器则是基于函数的回调
  2. 拦截器是实现HandleInterceptor，过滤器则是实现Filter接口
  3. 拦截器不依赖于Servlet容器，过滤器依赖于Servlet容器
  4. 拦截器使用来验证请求，能截断请求。过滤器用来设置request，response参数、属性，侧重对数据的过滤
  5. 过滤器在拦截器之前执行
  6. 过滤器是tomcat服务器创建的对象，拦截器是springmvc容器创建的对象
  7. 过滤器可以处理jsp、js、html等；拦截器是侧重拦截Controller的对象，如果你的请求不能被DispatcherServlet接收，这个请求不会执行拦截器的内容
  8. 拦截器可以获取IOC容器中的各个bean，而过滤器就不行，这点很重要，在拦截器里注入一个service，可以调用业务逻辑

配置SpringMVC

在classpath目录下也就是resources目录下新增spring-mvc.xml配置文件，写入：

<?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.xsd
       http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd ">

    <!--扫描控制器的包路径-->
    <context:component-scan base-package="com.bystart.ssm.controller"/>

    <!--开启springmvc模式-->
    <mvc:annotation-driven/>

    <!--静态资源默认servlet配置-->
    <mvc:default-servlet-handler/>

    <!--配置jsp 显示viewResolver -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
        <property name="prefix" value="/WEB-INF/views/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
</beans>

集成MySQL、MyBatis

同样是是在resources目录下，首先先创建mysql的连接配置文件jdbc.properties

jdbc.driver=com.mysql.jdbc.Driver
#数据库地址
jdbc.url=jdbc:mysql://127.0.0.1:3306/ssmdb?useUnicode=true&characterEncoding=utf8&useSSL=false
#用户名
jdbc.username=root
#密码
jdbc.password=123456
#最大连接数
c3p0.maxPoolSize=30
#最小连接数
c3p0.minPoolSize=10
#关闭连接后不自动commit
c3p0.autoCommitOnClose=false
#获取连接超时时间
c3p0.checkoutTimeout=10000
#当获取连接失败重试次数
c3p0.acquireRetryAttempts=2

继续添加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:context="http://www.springframework.org/schema/context"
       xmlns:tx="http://www.springframework.org/schema/tx"
       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">

    <!--配置数据库相关信息-->
    <!--读取数据库的连接配置信息-->
    <context:property-placeholder location="classpath:jdbc.properties"/>

    <!--构建数据库连接池-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="driverClass" value="${jdbc.driver}"/>
        <property name="jdbcUrl" value="${jdbc.url}"/>
        <property name="user" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <property name="maxPoolSize" value="${c3p0.maxPoolSize}"/>
        <property name="minPoolSize" value="${c3p0.minPoolSize}"/>
        <property name="autoCommitOnClose" value="${c3p0.autoCommitOnClose}"/>
        <property name="checkoutTimeout" value="${c3p0.checkoutTimeout}"/>
        <property name="acquireRetryAttempts" value="${c3p0.acquireRetryAttempts}"/>
    </bean>

    <!--配置SqlSessionFactory对象-->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--注入数据连接池-->
        <property name="dataSource" ref="dataSource"/>
        <!--扫描entity包 使用别名-->
        <property name="typeAliasesPackage" value="com.bystart.ssm.model"/>
        <!--扫描mapper文件-->
        <property name="mapperLocations" value="classpath:mapper/*.xml"/>
    </bean>

    <!--配置事务管理-->
    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <!--注入数据连接池-->
        <property name="dataSource" ref="dataSource"/>
    </bean>

    <!--配置使用注解声明式事务-->
    <tx:annotation-driven transaction-manager="transactionManager"/>

    <!--扫描Dao接口包 自动注入到spring容器-->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <!--注入sqlSessionFactory-->
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
        <!--dao接口包路径-->
        <property name="basePackage" value="com.bystart.ssm.dao"/>
    </bean>

    <!--扫描dao包下所有使用注解的类型-->
    <context:component-scan base-package="com.bystart.ssm.dao"/>

    <!--扫描service包下所有使用注解的类型-->
    <context:component-scan base-package="com.bystart.ssm.service"/>
</beans>

添加日志输出

新增logback-spring.xml同样是在resources目录下

<?xml version="1.0" encoding="UTF-8"?>
<configuration debug="true">
    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
        <encoder>
            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
        </encoder>
    </appender>
    <root level="debug">
        <appender-ref ref="STDOUT"/>
    </root>
</configuration>

实战从数据库查询数据

数据库表结构：

CREATE TABLE `sys_user` (
  `id` bigint NOT NULL AUTO_INCREMENT COMMENT '主键',
  `username` varchar(32) NOT NULL COMMENT '用户名',
  `password` varchar(32) NOT NULL COMMENT '密码',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci;

插入数据：

INSERT INTO `sys_user` (`id`, `username`, `password`) VALUES (1, 'sysadmin', '123456');

编写数据表对应的JavaBean

在包路径com.bystart.ssm.model下创建数据库表对应的Java类实体

package com.bystart.ssm.model;

public class SysUserEntity {
    /**
     * 自增id
     */
    private Long id;

    /**
     * 用户名
     */
    private String username;

    /**
     * 密码
     */
    private String password;

    public SysUserEntity() {
    }

    public SysUserEntity(Long id, String username, String password) {
        this.id = id;
        this.username = username;
        this.password = password;
    }

    public Long getId() {
        return id;
    }

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

    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;
    }

    @Override
    public String toString() {
        return "SysUserEntity{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

编写数据交互层DAO

在包com.bystart.ssm.dao路径下添加接口

package com.bystart.ssm.dao;

import com.bystart.ssm.model.SysUserEntity;
import org.apache.ibatis.annotations.Param;
import org.springframework.stereotype.Repository;

import java.util.List;

public interface SysUserDao{

    /**
     * 查询所有的用户
     * */
    List<SysUserEntity> getUserList();


    /**
     * 根据用户名查询指定用户
     * */
    SysUserEntity getUserByUsername(@Param("username") String username);
}

编写SysUserDao.xml

在resources-mapper目录下新增SysUserDao.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.bystart.ssm.dao.SysUserDao">

    <select id="getUserList" resultType="com.bystart.ssm.model.SysUserEntity">
        select * from sys_user
    </select>

    <select id="getUserByUsername" resultType="com.bystart.ssm.model.SysUserEntity">
        select *
        from sys_user
        where username = #{username}
    </select>
</mapper>

编写业务层接口

在com.bystart.ssm.service新增SysUserService接口，并提供两个方法

package com.bystart.ssm.service;

import com.bystart.ssm.model.SysUserEntity;

import java.util.List;

public interface SysUserService {

    /**
     * 查询所有的用户
     * */
    List<SysUserEntity> getUserList();


    /**
     * 根据用户名查询用户的信息
     * @param username 用户名查询条件
     * */
    SysUserEntity getUserByUsername(String username);

}

添加service的实现类，在com.bystart.ssm.service.impl包下新增SysUserServiceImpl实现类

package com.bystart.ssm.service.impl;

import com.bystart.ssm.dao.SysUserDao;
import com.bystart.ssm.model.SysUserEntity;
import com.bystart.ssm.service.SysUserService;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import java.util.List;

@Service
public class SysUserServiceImpl implements SysUserService {
    
    @Resource
    private SysUserDao dao;

    @Override
    public List<SysUserEntity> getUserList() {
        return dao.getUserList();
    }

    @Override
    public SysUserEntity getUserByUsername(String username) {
        return dao.getUserByUsername(username);
    }
}

编写controller

com.bystart.ssm.controller包下新增SysUserController

package com.bystart.ssm.controller;

import com.bystart.ssm.model.SysUserEntity;
import com.bystart.ssm.service.SysUserService;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.annotation.Resource;
import java.util.List;

@Controller
public class SysUserController {
    @Resource
    private SysUserService service;

    /**
     * 查询用户列表并返回到JSP进行数据渲染
     */
    @RequestMapping("/getUserList")
    public String getUserList(Model model) {
        List<SysUserEntity> userList = service.getUserList();
        model.addAttribute("userList", userList);
        // 返回到 webapp目录下的 WEB-INF > views > userList.jsp
        return "userList";
    }


    /**
     * 根据用户名查询指定用户
     * 将查询到的数据以json形式返回到页面
     *
     * @param username 用户名
     */
    @RequestMapping("/getUserByUsername")
    @ResponseBody
    public SysUserEntity getUserByUsername(@RequestParam String username) {
        SysUserEntity user = service.getUserByUsername(username);
        return user;
    }
}

编写JSP页面

在webapp -> WEB-INF -> views目录下新增userList.jsp：

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--
  Created by IntelliJ IDEA.
  User: bystart
  Date: 2023/7/6
  Time: 15:32
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" isELIgnored="false" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <table border=1>
        <thead>
            <tr>
                <th>序号</th>
                <th>用户名</th>
                <th>密码</th>
            </tr>
        </thead>
        <tbody>
        <c:forEach items="${userList}" var="user">
            <tr>
                <th>${user.id}</th>
                <th>${user.username}</th>
                <th>${user.password}</th>
            </tr>
        </c:forEach>
        </tbody>
    </table>
</body>
</html>

配置tomcat

image-20230706155011873

image-20230706161046778

image-20230706161116280

image-20230706161132531

配置好tomcat后即可运行起来

测试发起请求获得数据

我们编写的SysUserController中有两个接口，一个会返回页面，一个会返回json数据

我们在浏览器中请求http://localhost:8080/ssm/此处的地址可以在这里查看

image-20230706161729199

在浏览器访问http://localhost:8080/ssm/getUserList

image-20230706161856836

再去访问http://localhost:8080/ssm/getUserByUsername?username=sysadmin

image-20230706161924029

如果能跟我一样正常显示，说明ssm框架搭建完成，并且可以跟数据库进行交互

0
SpringMVCspringmybaits
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