【Java框架】知识点汇总Day4：SSM整合+项目实战（持续更新）

段ヤシ.

337人浏览 · 2026-05-24 17:08:09

段ヤシ. · 2026-05-24 17:08:09 发布

一、SSM整合

SSM：Spring + Spring MVC + MyBatis

Spring的作用？IOC容器自动创建各类对象

SSM框架整合本质就是把Sring MVC、MyBatis所需要的各自对象组件的创建交给Spring IOC来完成。

Spring 起到的作用就是整合创建另外两个框架所需的对象（XML文件，手动配置）
Spring MVC 负责Web层的交互，请求响应
MyBatis负责持久层的交互，连接数据库。

1.1 整合步骤

1.pom.xml

 <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>8.0.33</version>
    </dependency>
    <!--MyBatis 3.4.5（2017年的版本），和 MySQL 8.0 驱动兼容性不好。升级到 3.5.x,同时可以解决JDK11反射警告问题-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis</artifactId>
      <version>3.5.13</version>
    </dependency>
    <!--MyBatis整合Spring MVC-->
    <dependency>
      <groupId>org.mybatis</groupId>
      <artifactId>mybatis-spring</artifactId>
      <version>1.3.1</version>
    </dependency>
    <!--C3P0-->
     <dependency>
       <groupId>com.mchange</groupId>
       <artifactId>c3p0</artifactId>
       <version>0.9.5.5</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-jdbc</artifactId>
      <version>5.3.31</version>
    </dependency>
    <dependency>
      <groupId>org.projectlombok</groupId>
      <artifactId>lombok</artifactId>
      <version>1.18.32</version>
    </dependency>
    <!--版本要对应jdk-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-context</artifactId>
      <version>5.3.31</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aop</artifactId>
      <version>5.3.31</version>
    </dependency>
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-aspects</artifactId>
      <version>5.3.31</version>
    </dependency>
    <!--引入spring mvc的依赖-->
    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-webmvc</artifactId>
      <version>5.3.31</version>
    </dependency>
  </dependencies>

2.web.xml配置spring spring-mvc

web.xml是默认的配置文件

<!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>Archetype Created Web Application</display-name>
  <!--Spring-->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!--Spring MVC的前端控制器-->
  <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:springmvc.xml</param-value>
  </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

3.整合各自的配置文件

spring.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"
       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">

    <!-- Bean 定义、组件扫描、数据源等配置放在这里 -->
    <!--相当于把config.xml中的数据源、mapper映射内容拿过来-->
    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
        <property name="user" value="root"></property>
        <property name="password" value="123456"></property>
        <property name="driverClass" value="com.mysql.cj.jdbc.Driver"></property>
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/sys"></property>
        <property name="initialPoolSize" value="5"></property>
        <property name="maxPoolSize" value="10"></property>
    </bean>

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="mapperLocations" value="classpath:com/myspring/mapper/*.xml"></property>
        <!--引入config.xml中的settings-->
        <property name="configLocation" value="classpath:config.xml"></property>
    </bean>

    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.myspring.mapper"></property>
    </bean>

</beans>

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>
    <!-- 配置项 -->
    <settings>
        <!--打印SQL-->
        <setting name="logImpl" value="STDOUT_LOGGING"/>
        <!--懒加载-->
        <setting name="lazyLoadingEnabled" value="true"/>
        <!--开启二级缓存-->
        <setting name="cacheEnabled" value="true"/>
    </settings>
</configuration>

springmvc.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: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">

    <!-- 启用注解驱动，必须要有。Spring MVC 的 @RequestMapping 注解。
    需要 <mvc:annotation-driven/> 来启用注解驱动的处理器映射和适配器。
    没有它，Spring 根本不认识你的 @Controller 和 @RequestMapping-->
    <mvc:annotation-driven />
    <!-- 扫包 -->
    <context:component-scan base-package="com.myspring.controller"/>

    <!-- 视图解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

4.测试

package com.myspring.controller;
import com.myspring.entity.Class;
import com.myspring.entity.User;
import com.myspring.mapper.ClassMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class HelloController {

    @Autowired
    private ClassMapper classMapper;

    @RequestMapping("/index")
    public String index(){
        Class aclass =  this.classMapper.getById(1);
        System.out.println(aclass);
        return "index";
    }
}

启动Tomcat，访问localhost:8080/index

java.lang.AbstractMethodError: Method com/mchange/v2/c3p0/impl/NewProxyResultSet.isClosed()Z is abstract

原因：Java 版本与 c3p0 库不兼容

解决办法：升级 c3p0 到 0.9.5.x

<<dependency>
    <groupId>com.mchange</groupId>
    <artifactId>c3p0</artifactId>
    <version>0.9.5.5</version>
</dependency>

二、实战

2.1 查找

1.创建实体类

package com.ssm.entity;

import lombok.Data;

import java.util.Date;

@Data
public class News {

    private int id;
    private String title;
    private  String content;
    private Date createtime;
    private String opername;
    private String time;
}

2.创建Mapper及其.xml文件

package com.ssm.mapper;

import com.ssm.entity.News;

import java.util.List;

public interface NewsMapper {
    public List<News> list();
}

<?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.ssm.mapper.NewsMapper">

 <select id="list" resultType="com.ssm.entity.News">
     select * from sys_news
 </select>

</mapper>

3.Controller中添加方法

package com.ssm.controller;

import com.ssm.entity.News;
import com.ssm.mapper.NewsMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;

import java.text.SimpleDateFormat;
import java.util.List;

@Controller
public class HelloController {

    @Autowired
    private NewsMapper newsMapper;

    @RequestMapping("/list")
    public String list(Model model){
        List<News> list = this.newsMapper.list();
        model.addAttribute("list",list);
        for (News news : list){
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
           String format =  simpleDateFormat.format(news.getCreatetime());
           news.setTime(format);
        }
        return "index";
    }
}

4.pom.xml添加log4j依赖

jstl依赖很重要，不添加，访问时会报“org.apache.jasper.JasperException: /index.jsp (行.: [17], 列: [4]) 在用前缀[c]导入的标记库中未定义标记[]”

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>jstl</artifactId>
    <version>1.2</version>
</dependency>

  <!-- Servlet API - 编译时需要，打包时不包含 -->
    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>javax.servlet-api</artifactId>
      <version>4.0.1</version>
      <scope>provided</scope>  <!-- 必须是 provided -->
    </dependency>

5.创建index.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page isELIgnored="false"%>
<%--<%@ taglib prefix="c" uri="http://www.springframework.org/tags/form" %>--%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<table border="1">
    <tr>
        <td>ID</td>
        <td>标题</td>
        <td>内容</td>
        <td>创建时间</td>
        <td>操作员</td>
    </tr>
    <c:forEach items="${list}"  var="news">
    <tr>
        <td>${news.id}</td>
        <td>${news.title}</td>
        <td>${news.content}</td>
        <td>${news.time}</td>
        <td>${news.opername}</td>
    </tr>
    </c:forEach>   <%-- ✅ <tr> 必须放在 <c:forEach> 和 </c:forEach> 之间 --%>

</table>

</body>
</html>

<tr>不放在<c:forEach>之间，就执行一次，只能看到表头。

6.测试

如果检查之后还是只显示表头，检查访问地址，默认跳转localhost:8080,我们需要访问localhost:8080/list，才能看到数据。

2.2 添加

1.index.jsp

<a href="add.jsp">添加</a>

2.创建add.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form action="/add" method="post">
    <table>
        <tr>
            <td>title: </td>
            <td>
                <input type="text" name="title">
            </td>
        </tr>
        <tr>
            <td>content: </td>
            <td>
                <input type="text" name="content">
            </td>
        </tr>
        <tr>
            <td>opername: </td>
            <td>
                <input type="text" name="opername">
            </td>
        </tr>
        <tr>
            <td>
                <input type="submit" name="提交">
            </td>
            <td>
                <input type="reset" name="重置">
            </td>
        </tr>
    </table>
</form>

</body>
</html>

3.controller中添加add方法

 @RequestMapping("/add")
    public String add(News news){
        System.out.println(news);
        news.setCreatetime(new Date());
      this.newsMapper.add(news);
        return "redirect:/list";
    }

4.mapper及.xml文件中添加add方法

package com.ssm.mapper;

import com.ssm.entity.News;

import java.util.List;

public interface NewsMapper {
    public List<News> list();
    public void add(News news);
}

 <insert id="add" parameterType="com.ssm.entity.News">
     insert into sys_news(title,content,createtime,opername) values (#{title},#{content},#{createtime},#{opername})
 </insert>

5.测试

访问localhost:8080/list

点击“添加”

点击“提交”

出现乱码的情况。

原因：web.xml 用的是 Web Application 2.3 DTD，这个版本不支持 <filter> 放在 <servlet> 之前的规范要求，但实际上 Tomcat 会按顺序加载。

关键问题：你的 web.xml 中根本没有 CharacterEncodingFilter

web.xml中添加

<!-- 1. 编码过滤器 - 必须放在最前面 -->
    <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>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

重启Tomcat测试

如果Tomcat服务器显示的数据也是乱码。

解决办法：spring.xml文件中更改为

<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/car_rental_separate?useUnicode=true&amp;characterEncoding=utf-8&amp;serverTimezone=Asia/Shanghai"></property>

2.3 编辑

1.index.jsp链接“编辑”

        <td>
            <a href="/get?id=${news.id}">编辑</a>
        </td>

2.创建edit.jsp

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page isELIgnored="false"%>
<html>
<head>
    <title>Title</title>
</head>
<body>
<form action="/update" method="post">
    <table>
        <tr>
            <td>ID: </td>
            <td>
              <!--只读或者隐藏，在数据库中是自增，强行更改会导致提交后得不到更新后的数据-->
                <input type="text" name="id" value="${news.id}" readonly> 
            </td>
        </tr>
        <tr>
            <td>title: </td>
            <td>
                <input type="text" name="title" value="${news.title}">
            </td>
        </tr>
        <tr>
            <td>content: </td>
            <td>
                <input type="text" name="content" value="${news.content}">
            </td>
        </tr>
        <tr>
            <td>createtime: </td>
            <td>
                <input type="text" name="createtime" value="${news.createtime}" readonly>
            </td>
        </tr>
        <tr>
            <td>opername: </td>
            <td>
                <input type="text" name="opername" value="${news.opername}">
            </td>
        </tr>
        <tr>
            <td>
                <input type="submit" name="提交">
            </td>
            <td>
                <input type="reset" name="重置">
            </td>
        </tr>
    </table>
</form>

</body>
</html>

3.mapper及xml文件

mapper 增加方法

public News getById(Integer id);
    public void update(News news);

.xml

 <select id="update" parameterType="com.ssm.entity.News">
        update sys_news set title = #{title},content = #{content},opername = #{opername} where id = ${id}
    </select>

4.congtroller实现方法

 @RequestMapping("/get")
    public String get(Integer id,Model model){
        News news = this.newsMapper.getById(id);
        model.addAttribute("news",news);
        return "edit";
    }

    @RequestMapping("/update")
    public String update(News news){
        this.newsMapper.update(news);
        return "redirect:/list";

    }

5.测试

2.4 删除

升级 web.xml 到 Servlet 3.0+

如果不升级，保持2.0的话，删除数据时会出现，网页闪一下，但是数据未被删除的情况。

<?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">

1.index.jsp文件

        <td>
            <a href="/delete?id=${news.id}">删除</a>
        </td>

2.mapper及.xml文件

 public void deleteById(Integer id);

  <select id="deleteById" parameterType="java.lang.Integer">
        delete from sys_news where id = #{id}
    </select>

3.controller

 @RequestMapping("/delete")
    public String delete(Integer id){
        this.newsMapper.deleteById(id);
        return "redirect:/list";
    }

4.测试

点击“删除”就能删除数据

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段ヤシ.

@qq_54015925

已为社区贡献15条内容

【Java框架】知识点汇总Day4：SSM整合+项目实战（持续更新）

段ヤシ.

一、SSM整合

1.1 整合步骤

1.pom.xml

2.web.xml配置spring spring-mvc

3.整合各自的配置文件

4.测试

二、实战

2.1 查找

1.创建实体类

2.创建Mapper及其.xml文件

3.Controller中添加方法

4.pom.xml添加log4j依赖

5.创建index.jsp

6.测试

2.2 添加

1.index.jsp

2.创建add.jsp

3.controller中添加add方法

4.mapper及.xml文件中添加add方法

5.测试

2.3 编辑

1.index.jsp链接“编辑”

2.创建edit.jsp

3.mapper及xml文件

4.congtroller实现方法

5.测试

2.4 删除

1.index.jsp文件

2.mapper及.xml文件

3.controller

4.测试

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段ヤシ.