SpringMVC框架从入门到入土(三):SSM的整合开发
SSM整合开发的实现步骤
SSM整合开发
SpringMVC + Spring + Mybatis
SpringMVC:视图层,界面层,负责接收请求,显示处理结果1
Spring:业务层,管理service,dao,工具类
Mybatis:持久层,访问数据库
工作流程:
用户发起请求--------使用SpringMVC接收--------Spring中的Service对象--------Mybatis处理数据
SSM整合也叫SSI,整合中有2个容器
1. SpringMVC的容器,管理Controller控制器对象
2. Spring容器,管理Service,Dao,工具类对象的
我们要做的就是把使用的对象交给合适的容器创建,管理。把Controller还有web开发的相关对象交给SpringMVC
这些web用的对象写在springmvc的配置文件中
service,dao对象写在spring配置文件中,让spring管理这些对象。
springmvc和spring容器有关系,关系已经确定了
springmvc和spring容器的子容器,类似java中的继承,就可以实现controller使用的service对象
实现步骤:
0. 使用springdb的数据库,表使用student(id,name,email,age)其中id自增
1. 新建maven项目
2. 加入依赖
springmvc、spring、mybatis三个框架的依赖,jackson依赖,mysql驱动,druid连接池
jsp,servlet依赖
3. 写web.xml
①注册DispatchServlet 目的:1. 创建springmvc容器对象,才能创建Controller类对象
2. 创建的是Servlet,才能接收用户的请求
②注册spring的监听器:ContextLoaderListener 目的:创建spring容器,才能创建service,到对象
③注册字符集过滤器,解决post请求的乱码问题
4. 创建包,Controller包,service,dao,实体类包名创建好
5. 写springmvc,spring,mybatis的配置文件
①springmvc的配置文件
②spring的配置文件
③mybatis的主配置文件
④数据库的属性配置文件
6. 写代码,dao接口和mapper文件,service文件
导入依赖
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2.1-b03</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.3.16</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.5.RELEASE</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.9.8</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.9.8</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.9</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.12</version>
</dependency>
<build>
<resources>
<resource>
<directory>src/main/java</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
<resource>
<directory>src/main/resources</directory>
<includes>
<include>**/*.properties</include>
<include>**/*.xml</include>
</includes>
<filtering>false</filtering>
</resource>
</resources>
</build>
编写Web.xml文件
<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:conf/dispatcherServlet.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>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:conf/applicationContext.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<filter>
<filter-name>characterEncodingFilter</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>forceRequestEncoding</param-name>
<param-value>true</param-value>
</init-param>
<init-param>
<param-name>forceResponseEncoding</param-name>
<param-value>true</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>characterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
编写配置文件
springmvc的配置文件
<context:component-scan base-package="com.liar.controller"/>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/view/"/>
<property name="suffix" value=".jsp"/>
</bean>
<mvc:annotation-driven/>
<mvc:default-servlet-handler/>
数据库连接资源配置文件
jdbc.url=jdbc:mysql://localhost:3306/springdb?characterEncoding=UTF8&useSSL=false
jdbc.username=root
jdbc.password=001204
jdbc.maxActive=20
spring的配置文件
<context:property-placeholder location="classpath:conf/jdbc.properties"/>
<bean id="myDataSource" class="com.alibaba.druid.pool.DruidDataSource"
init-method="init" destroy-method="close">
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
<property name="maxActive" value="${jdbc.maxActive}"/>
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="myDataSource"/>
<property name="configLocation" value="classpath:conf/mybatis.xml"/>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
<property name="basePackage" value="com.liar.dao"/>
</bean>
<context:component-scan base-package="com.liar.service"/>
mybatis的主配置文件
<typeAliases>
<package name="com.liar.entity"/>
</typeAliases>
<mappers>
<package name="com.liar.dao"/>
</mappers>
写接口和实现类
dao包
public interface StudentDao {
int insertStudent(Student student);
List<Student> selectStudents();
}
<?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.liar.dao.StudentDao">
<select id="selectStudents" resultType="com.liar.entity.Student">
select id, name, email, age
from student
order by id desc
</select>
<insert id="insertStudent">
insert into student(name, email, age)
values (#{name}, #{email}, #{age})
</insert>
</mapper>
service包
int addStudent(Student student);
List<Student> findStudents();
package com.liar.service.impl;
import com.liar.dao.StudentDao;
import com.liar.entity.Student;
import com.liar.service.StudentService;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
import java.util.List;
@Service
public class StudentServiceImpl implements StudentService {
@Resource
private StudentDao studentDao;
@Override
public int addStudent(Student student) {
return studentDao.insertStudent(student);
}
@Override
public List<Student> findStudents() {
return studentDao.selectStudents();
}
}
controller包
package com.liar.controller;
import com.liar.entity.Student;
import com.liar.service.StudentService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import javax.annotation.Resource;
import java.util.List;
@Controller
@RequestMapping("/student")
public class MyController {
@Resource
private StudentService service;
@RequestMapping(value = "/addStudent.do")
public ModelAndView addStudent(Student student){
ModelAndView mv = new ModelAndView();
String message = "注册失败!";
int nums = service.addStudent(student);
if(nums > 0){
message = student.getName() + "注册成功!";
}
mv.addObject("message",message);
mv.setViewName("result");
return mv;
}
@RequestMapping(value = "/queryStudent.do")
@ResponseBody
public List<Student> queryStudent(Student student){
List<Student> students = service.findStudents();
return students;
}
}
前端
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<% String basePath = request.getScheme() +"://"
+request.getServerName() + ":" + request.getServerPort() +
request.getContextPath() + "/";
%>
<html>
<head>
<title>功能入口</title>
<base href="<%=basePath%>"/>
</head>
<body>
<div align="center">
<p>SSM整合的例子</p>
</div>
<div align="center">
<img src="images/door.jpg" width="100px" height="50px"/>
</div>
<table align="center">
<tr>
<td><a href="addStudent.jsp">注册学生</a></td>
</tr>
<tr>
<td><a href="listStudent.jsp">浏览学生</a></td>
</tr>
</table>
</body>
</html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<% String basePath = request.getScheme() +"://"
+request.getServerName() + ":" + request.getServerPort() +
request.getContextPath() + "/";
%>
<html>
<head>
<title>添加学生</title>
<base href="<%=basePath%>"/>
</head>
<body>
<h3 align="center">添加学生</h3>
<hr/>
<div align="center">
<form action="student/addStudent.do" method="post">
<table>
<tr>
<td>姓名:</td>
<td><input type="text" name="name"></td>
</tr>
<tr>
<td>邮箱:</td>
<td><input type="text" name="email"></td>
</tr>
<tr>
<td>年龄:</td>
<td><input type="text" name="age"></td>
</tr>
<tr>
<td> </td>
<td><input type="submit" value="注册"></td>
</tr>
</table>
</form>
</div>
</body>
</html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<% String basePath = request.getScheme() +"://"
+request.getServerName() + ":" + request.getServerPort() +
request.getContextPath() + "/";
%>
<html>
<head>
<title>查询学生页面</title>
<base href="<%=basePath%>"/>
<script type="application/javascript" src="js/jquery-3.6.0.js"></script>
<script type="application/javascript">
$(function (){
//在当前页面dom对象加载后直接执行
loadStudentDate();
$("#btnLoader").click(function (){
loadStudentDate();
})
})
function loadStudentDate(){
$.ajax({
url:"student/queryStudent.do",
type:"get",
dataType:"json",
success:function (data){
//清楚旧的数据
$("#info").html("")
$.each(data,function (i,n){
$("#info").append("<tr>")
.append("<td>"+n.id+"</td>")
.append("<td>"+n.name+"</td>")
.append("<td>"+n.email+"</td>")
.append("<td>"+n.age+"</td>")
.append("</tr>")
})
}
})
}
</script>
</head>
<body>
<div align="center">
<table>
<thead>
<tr>
<td>学号</td>
<td>姓名</td>
<td>邮件</td>
<td>年龄</td>
</tr>
</thead>
<tbody id="info">
</tbody>
</table>
<input type="button" id="btnLoader" value="查询事件">
</div>
</body>
</html>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>结果页面</title>
</head>
<body>
<h5 align="center">结果页面</h5>
<hr/>
<h6 align="center">注册结果:${message}</h6>
</body>
</html>