springmvc整合mybatis
2020-02-05 16:03:01来源:博客园 阅读 ()
springmvc整合mybatis
准备工作
IDEA 2019.3.1
MySql 8.0.17
Tomcat 7.0.9
开始步骤
一、创建一个项目,添加Web支持
点击菜单:File->NEW->Project
[](https://img2018.cnblogs.com/blog/
1380074/202002/1380074-20200205231042588-855824854.png)
选择左侧的Maven项目,这里的 Create from archetype先不要选择,然后点击Next
项目建好之后,目录结构如下:
在项目上右键单击,弹出菜单,选择 Add Framework Support
弹出如下界面,勾选左侧的Web Application(4.0),点击OK
点击OK之后,可以看到项目的目录结构有web文件夹了
二、项目搭建
1.数据库
新建数据库,创建一个student表,并插入几条数据
create table test.student
(
id integer auto_increment primary key ,
name varchar(50),
age int,
detail varchar(200)
)
insert into test.student(name,age,detail) values
('Tony1',18,'Tony1 is handsome');
insert into test.student(name,age,detail) values
('Tony2',19,'Tony2 is more handsome');
insert into test.student(name,age,detail) values
('Tony2',20,'Tony3 is most handsome');
2.项目目录
在项目结构的/src/main/java文件夹下创建一个包,并添加dao,service,entities,controller这四个文件夹,在/web/WEB-INF目录下添加jsp文件夹:
3.配置文件
本项目总共有7个配置文件:
web.xml:项目的配置文件
applicationContext.xml:spring总的配置文件,会引用controller/service/dao的配置文件
spring-controller.xml:controller层的配置文件
spring-service.xml:service层的配置文件
spring-dao.xml:dao层的配置文件,同时配置,mybatis的配置扫描
db.properties:数据库配置文件,被dao引用
StudentDao.xml:mybatis实体类映射文件
4.maven配置
引入springmvc ,mybatis所需的包,配置如下:
<dependencies>
<!--Junit-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
</dependency>
<!--数据库驱动-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.47</version>
</dependency>
<!-- 数据库连接池 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
<!--Servlet - JSP -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.2</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<!--Mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.2</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>2.0.2</version>
</dependency>
<!--Spring-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>5.1.9.RELEASE</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.10</version>
</dependency>
</dependencies>
解决资源文件的依赖问题:
<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>
三、代码编写
1.在entities包中添加Student类:
package com.Tony.entities;
public class Student {
private int id;
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 int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
public String getDetail() {
return detail;
}
public void setDetail(String detail) {
this.detail = detail;
}
private String name;
private int age;
private String detail;
}
2.在dao包中添加StudentDao接口:
package com.Tony.dao;
import com.Tony.entities.Student;
import java.util.List;
public interface StudentDao {
Student findStudentById(int id);
List<Student> findAllStudent();
int deleteStudent(int id);
int updateStudent(Student student);
int addStudent(Student student);
}
3.在dao中添加StudentDao.xml 映射文件
<?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.Tony.dao.StudentDao">
<select id="findStudentById" parameterType="int" resultType="com.Tony.entities.Student">
select * from test.student where id=#{id}
</select>
<select id="findAllStudent" resultType="com.Tony.entities.Student">
select * from test.student
</select>
<delete id="deleteStudent" parameterType="int">
delete from test.student where id=#{id}
</delete>
<update id="updateStudent" parameterType="com.Tony.entities.Student">
update test.student set name=#{name},age=#{age},detail=#{detail} where id=#{id}
</update>
<insert id="addStudent" parameterType="com.Tony.entities.Student">
insert into test.student(name,age,detail) values
(#{name},#{age},#{detail})
</insert>
</mapper>
4.在service包中添加StudentService接口和其实现类StudentServiceImpl:
StudentService:
package com.Tony.service;
import com.Tony.entities.Student;
import java.util.List;
public interface StudentService {
Student findStudentById(int id);
List<Student> findAllStudent();
int deleteStudent(int id);
int updateStudent(Student student);
int addStudent(Student student);
}
StudentServiceImpl:
package com.Tony.service;
import com.Tony.dao.StudentDao;
import com.Tony.entities.Student;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class StudentServiceImpl implements StudentService {
@Autowired
private StudentDao studentDao;
public Student findStudentById(int id) {
return this.studentDao.findStudentById(id);
}
public List<Student> findAllStudent() {
return this.studentDao.findAllStudent();
}
public int deleteStudent(int id) {
return this.studentDao.deleteStudent(id);
}
public int updateStudent(Student student) {
return this.studentDao.updateStudent(student);
}
public int addStudent(Student student) {
return this.studentDao.addStudent(student);
}
}
5.在controller包中添加StudentController,并添加showAllStudent接口:
package com.Tony.controller;
import com.Tony.entities.Student;
import com.Tony.service.StudentService;
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.util.List;
@Controller
@RequestMapping("/student")
public class StudentController {
@Autowired
private StudentService studentService;
@RequestMapping("/showAllStudent")
public String showAllStudent(Model model)
{
List<Student> list=studentService.findAllStudent();
model.addAttribute("list",list);
return "allStudent";
}
}
6.在/web/WEB-INF/jsp/文件夹中添加allStudent.jsp页面:
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>显示所有的学生</title>
</head>
<body>
<table>
<thead>
<tr>
<td>学生ID</td>
<td>学生姓名</td>
<td>学生年龄</td>
<td>学生明细</td>
</tr>
</thead>
<tbody>
<c:forEach var="student" items="${requestScope.get('list')}">
<tr>
<td>${student.id}</td>
<td>${student.name}</td>
<td>${student.age}</td>
<td>${student.detail}</td>
</tr>
</c:forEach>
</tbody>
</table>
</body>
</html>
四、配置文件
1.db.properties
jdbc.url=jdbc:mysql://localhost:3306/test
jdbc.username=root
jdbc.password=123456
jdbc.driver=com.mysql.jdbc.Driver
2.spring-dao.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
https://www.springframework.org/schema/context/spring-context.xsd">
<context:property-placeholder location="classpath:db.properties"></context:property-placeholder>
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"></property>
<property name="user" value="${jdbc.username}"></property>
<property name="password" value="${jdbc.password}"></property>
<property name="jdbcUrl" value="${jdbc.url}"></property>
</bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource"></property>
</bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>
<property name="basePackage" value="com.Tony.dao"></property>
</bean>
</beans>
3.spring-service.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:cache="http://www.springframework.org/schema/cache"
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/cache
http://www.springframework.org/schema/cache/spring-cache.xsd">
<context:component-scan base-package="com.Tony.service"></context:component-scan>
</beans>
4.spring-controller.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
https://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!--扫描@controller注解-->
<context:component-scan base-package="com.Tony.controller"></context:component-scan>
<!--@RequestMapping生效-->
<mvc:annotation-driven></mvc:annotation-driven>
<bean id="internalResourceViewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
5.applicationContext.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"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd">
<import resource="classpath:spring-controller.xml"></import>
<import resource="classpath:spring-dao.xml"></import>
<import resource="classpath:spring-service.xml"></import>
</beans>
最后,整个项目的目录结构如下:
五、配置Tomcat
点击上方的AddConfiguration按钮
弹出如下界面,点击+号,选择Tomcat Server->Local
弹出如下界面,点击fix:
配置后,这里就看得到刚配置的Tomcat服务器名了:
六、配置打包的Artifacts:
点击菜单File->Project Structure:
弹出如下界面,选择左侧的Artifacts:
在Output Layout的WEB-INF下新建一个lib文件夹(注意此处必须是lib,全部是小写,写错了会导致出各种错误):
选中lib文件夹,右键单击,弹出菜单,选择Add Copy of->Library Files:
七、运行项目:
点击如下的播放按钮运行项目,运行起来之后,IDEA会自动打开浏览器
打开浏览器之后,默认是如下的网址:
我们需要加上显示所有学生的网址,然后按回车键,就可以显示所有的学生了:
八、各种问题排查
1.不支持发行版本5:
解决办法:
点击菜单:File->Setting,弹出如下界面,选择左边的Build,Execution,Deployment->Compiler->Java Compiler,
将项目的target bytecode version从1.5改为9
原文链接:https://www.cnblogs.com/lishuanguan1987/p/12267350.html
如有疑问请与原作者联系
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