整合思路
主要分为Controller,service层,dao层
- 整合dao:mybatis和spring的整合,通过spring来管理mapper接口,数据源,使用mapper的扫描器自动扫描mapper接口
- service层:通过spring来管理service类,并将dao层的实例注入到service中使用,另事务相关的操作也通过spring进行管理
- 整合controller层:springMVC是spring中的一部分,不需要进行整合,spring管理将service层实例注入到controller层
1.数据库与实体类
以student表的信息为例:
根据数据库,建立对应的实体类Student
package com.bean;
/**
* Description :
* Created by Resumebb
* Date :2021/4/19
*/
public class Student {
/**
* 和数据库中的Student表对应
*/
private Integer SID;
private String Sname;
private String Ssex;
private Integer Sage;
//省略的getter和setter方法
public Integer getSID() {
return SID;
}
public void setSID(Integer SID) {
this.SID = SID;
}
public String getSname() {
return Sname;
}
public void setSname(String sname) {
Sname = sname;
}
public String getSsex() {
return Ssex;
}
public void setSsex(String ssex) {
Ssex = ssex;
}
public Integer getSage() {
return Sage;
}
public void setSage(Integer sage) {
Sage = sage;
}
@Override
public String toString() {
return "com.pojo{" +
"SID=" + SID +
", Sname='" + Sname + '\'' +
", Ssex='" + Ssex + '\'' +
", Sage=" + Sage +
'}';
}
}
2.引入依赖
依赖中包含了spring四个核心依赖,mybatis依赖,springmvc依赖,mybats-spring整合依赖,数据库连接池依赖等。
<?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>org.example</groupId>
<artifactId>springMVC</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<name>springMVC Maven Webapp</name>
<!-- FIXME change it to the project's website -->
<url>http://www.example.com</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.7</maven.compiler.source>
<maven.compiler.target>1.7</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency>
<!-- spring依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
<!--web依赖/spring mvc依赖-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<!--tomcat servlet api -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<!--mybatis依赖-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.4.1</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.39</version>
</dependency>
<!-- 整合-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.3.0</version>
</dependency>
<!-- 连接池-->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
</dependencies>
<build>
<finalName>springMVC</finalName>
<pluginManagement><!-- lock down plugins versions to avoid using Maven defaults (may be moved to parent pom) -->
<plugins>
<!--Jetty福服务器插件-->
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>maven-jetty-plugin</artifactId>
<version>6.1.24</version>
<configuration>
<connectors>
<connector implementation="org.mortbay.jetty.nio.SelectChannelConnector">
<port>8089</port>
<maxIdleTime>30000</maxIdleTime>
</connector>
</connectors>
<contextPath>/</contextPath>
</configuration>
</plugin>
<plugin>
<artifactId>maven-clean-plugin</artifactId>
<version>3.1.0</version>
</plugin>
<!-- see http://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_war_packaging -->
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<version>3.0.2</version>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.8.0</version>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.22.1</version>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>3.2.2</version>
</plugin>
<plugin>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
</plugin>
<plugin>
<artifactId>maven-deploy-plugin</artifactId>
<version>2.8.2</version>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
3.mybatis设计
StudentMapper接口:
public interface StudentMapper {
public List<Student> findAll();
}
StudentService:
@Service
public class StudentService {
@Autowired
private StudentMapper studentMapper;
public List<Student> selectAllStudents(){
return studentMapper.findAll();
}
}
StudentMapper.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.dao.StudentMapper">
<select id="findAll" resultType="com.bean.Student">
select * from Student
</select>
</mapper>
4.spring设计
主要配置数据源,注入mapper映射文件,配置会话工厂。
<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
http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-3.0.xsd">
<!--开启注解-->
<context:component-scan base-package="com"/>
<!--配置数据源:借助连接池c3p0-->
<bean id ="dataSource" class="com.mchange.v2.c3p0.DriverManagerDataSource">
<!--注入属性-->
<property name="driverClass" value="com.mysql.jdbc.Driver"/>
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/test"/>
<property name="user" value="root"/>
<property name="password" value="123456"/>
</bean>
<bean id="sqlSessionFactory" scope="singleton" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<!--注入mapper映射文件-->
<!-- <property name="configLocation" value="mmapper/StudentMapper.xml"></property>-->
<property name="mapperLocations" value="classpath:mapper/*.xml"/>
</bean>
<bean class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="mapperInterface" value="com.dao.StudentMapper"/>
<!--会话工厂-->
<property name="sqlSessionFactory" ref="sqlSessionFactory"/>
</bean>
</beans>
5.springmvc设计
配置处理器
<?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-4.1.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd">
<!--扫描controller写注解-->
<context:component-scan base-package="com.controller"/>
<!--配置映射器-->
<mvc:annotation-driven/>
<!--配置视图解析器-->
<!--视图解析器-->
<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!--jsp页面前缀-->
<property name="prefix" value="/WEB-INF/jsp/"/>
<!--jsp后缀-->
<property name="suffix" value=".jsp"/>
</bean>
</beans>
设计视图studentlist.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>学生信息展示</title>
</head>
<body>
<table align="center" border="1">
<thead>
<tr>
<td>学生ID</td>
<td>用户名</td>
<td>性别</td>
<td>年龄</td>
</tr>
</thead>
<tbody>
<c:forEach items="${students}" var="student">
<tr>
<td>${student.SID}</td>
<td>${student.sname}</td>
<td>${student.ssex}</td>
<td>${student.sage}</td>
</tr>
</c:forEach>
</tbody>
</table>
</form>
</body>
</html>
web.xml
在web.xml配置文件中读取spring配置
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-core.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-core.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--前端控制器-->
<servlet>
<servlet-name>springMVC</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<!--将springMVC的配置文件进行配置-->
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc2.xml</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>springMVC</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
StudentController
package com.controller;
import com.bean.Student;
import com.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;
import java.util.List;
/**
* Description :
* Created by Resumebb
* Date :2021/4/19
*/
@Controller
public class StudentController {
@Autowired
//将service层对象注入
private UserService userService;
@RequestMapping("/list")
public ModelAndView list(){
List<Student> students = userService.selectAllStudents();
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("students",students);
modelAndView.setViewName("studentlist");
return modelAndView;
}
}
运行结果
可能出现的问题
报错java.lang.NoClassDefFoundError: org/springframework/dao/support/DaoSupport
包没有导全,检查spring的包,我整合的时候少导入了两个包:
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.2.8.RELEASE</version>
</dependency>
报错[/mapper/]cannot be resolved to URL because it does not exist
在注入mapper的映射文件时,没有找到对应的xml文件,这两种写法不要用混了,configLocation指明单个xml,mapperLocation是可以指多个的,如果找不到,就在前面加classpath:
<property name="configLocation" value="mapper/StudentMapper.xml"></property>
<property name="mapperLocations" value="classpath:mapper/*.xml"/>
报错没有某个数据库的数据,比如com.Student doe not have the property ‘Sname’
用拿值的时候根据提示去拿,Sname找不到,正确的应该是student.sname,根据系统提示输入。
参数绑定与返回值
SPringMVC,在客户端提交数据的过程中,客户端将数据以key-value形式进行提交,在SPringMVC中通过参数绑定器将参数绑定到方法的形参上,这里涉及到一个参数绑定器,将请求的数据转化为需要的数据。
以上个Demo为例进行测试,目的是通过一个超链接跳转至url,新的jsp为一个修改页面。
Handler开发
@RequestMapping(value = "/{id}")
//{id} 通过符 @PathVariable注解将注解括号中的属性名绑定到当前的参数上
public ModelAndView edit(@PathVariable("id")int id) throws Exception {
Student student = userService.selectStudentById(id);
//修改页面将原数据进行回显
ModelAndView modelAndView = new ModelAndView();
modelAndView.addObject("user",student);
modelAndView.setViewName("editStudent");
return modelAndView;
}
视图开发
修改界面,editStudent.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>修改页面</title>
</head>
<body>
<form action="${pageContext.request.contextPath }/editUserSubmit" method="post">
<table width="60%" border="1"align="center">
<h1 align="center">修改用户信息</h1>
<tr>
<td>用户ID</td>
<td> <input type="text" name="id" value="${user.SID }" readonly ></td> </td>
</tr>
<tr>
<td>用户名</td>
<td> <input id="username" type="text" name="username" value="${user.sname }"></td> </td>
</tr>
<tr>
<td>性别</td>
<td> <input id="sex" type="text" name="sex" value="${user.ssex }"></td> </td>
</tr>
<tr>
<td>地址</td>
<td> <input id="address" type="text" name="address" value="${user.sage }"></td> </td>
</tr>
<tr ><td colspan="2" align="center"><input type="submit" value="提交"/></td></tr>
</table>
</form>
</body>
</html>
学生界面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ taglib uri="http://java.sun.com/jsp/jstl/fmt" prefix="fmt" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>学生信息展示</title>
</head>
<body>
<table align="center" border="1">
<thead>
<tr>
<td>学生ID</td>
<td>用户名</td>
<td>性别</td>
<td>年龄</td>
<td>编辑</td>
</tr>
</thead>
<tbody>
<c:forEach items="${students}" var="student">
<tr>
<td>${student.SID}</td>
<td>${student.sname}</td>
<td>${student.ssex}</td>
<td>${student.sage}</td>
<td><a href="${pageContext.request.contextPath}/student/${student.SID}"/>修改</td>
</tr>
</c:forEach>
</tbody>
</table>
</form>
</body>
</html>
StudentMapper
添加新的查询语句
<select id="selectStudentById" resultType="com.bean.Student">
select * from Student where SID = #{id}
</select>
运行结果
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