SpringMVC+Spring+Mybatis(SSM)项目基础架构搭建

1.创建web项目

2.导入相关jar包

3.先完成mybatis 的配置

（1）数据建立

（2）根据数据库建立实体类com.l.entity.User.java

package com.l.entity;

public class User {
private int id;
private String name;
private String address;

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 String getAddress() {
return address;
}

public void setAddress(String address) {
this.address = address;
}

@Override
public String toString() {
// TODO Auto-generated method stub
return "User[id=" + id + ",name=" + name + ",address=" + address + "]";
}

}

（3）创建映射类  com.l.mapper.UserMapper.java

package com.l.mapper;

import com.l.entity.User;

public interface UserMapper {
public User selectUserById(int id);
}

（4）创建实体类映射文件（Mapper文件）  User.xml直接放在src目录下

<?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.l.mapper.UserMapper">
<select id="selectUserById" parameterType="int" resultType="User">
select * from user where id = #{id}
</select>
</mapper>

（5）创建数据操作Dao层  新建com.l.dao.UserDao

package com.l.dao;

import com.l.entity.User;

public interface UserDao {
public User findUserById(int id);
}

（6）创建dao层实现类  com.l.dao.impl.UserDaoImpl

package com.l.dao.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.l.dao.UserDao;
import com.l.entity.User;
import com.l.mapper.UserMapper;

@Component
public class UserDaoImpl implements UserDao {
@Autowired
private UserMapper usermapper;

@Override
public User findUserById(int id) {
User user = usermapper.selectUserById(id);
return user;
}

}

（7）编写mybatis配置文件  configuration.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>
<typeAliases>
<!-- 给实体类取别名 方便调用 否则 在student.xml中的resultType需要写成com.l.entity.Student -->
<typeAlias alias="User" type="com.l.entity.User"></typeAlias>
</typeAliases>

<!-- 加载映射文件路径 -->
<mappers>
<mapper resource="User.xml" />
</mappers>
</configuration>

2.完成spring配置

（1）采用@Autowired自动注入

package com.l.dao.impl;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import com.l.dao.UserDao;
import com.l.entity.User;
import com.l.mapper.UserMapper;

@Component
public class UserDaoImpl implements UserDao {
@Autowired
private UserMapper usermapper;

@Override
public User findUserById(int id) {
User user = usermapper.selectUserById(id);
return user;
}

}

（2）编写spring配置文件  applicationContext.xml  直接存放在src目录下

<?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:aop="http://www.springframework.org/schema/aop"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">
<!-- 配置数据源 -->
<bean id="dataSource"
class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/test" />
<property name="username" value="root" />
<property name="password" value="1234" />
</bean>

<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:configuration.xml" />
</bean>

<bean id="userMapper" class="org.mybatis.spring.mapper.MapperFactoryBean">
<property name="mapperInterface" value="com.l.mapper.UserMapper" />
<property name="sqlSessionFactory" ref="sqlSessionFactory" />
</bean>
<!-- 自动扫描注解的bean -->
<context:component-scan base-package="com.l.dao" />

</beans>

（3）在web.xml中启动spring

<!-- 配置加载Spring容器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>

3.完成springMVC配置

（1）配置web.xml文件对springMVC的启动，加上spring的配置和字符设置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>SpringMvc_Mybatis</display-name>

<!-- 配置加载Spring容器 -->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:applicationContext.xml</param-value>
</context-param>

<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/spmvc-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!-- 让Spring MVC的前端控制器拦截所有请求 -->
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>

<!-- 解决中文乱码的情况 -->
<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>
</filter>
<filter-mapping>
<filter-name>CharacterEncodingFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>

</web-app>

（2）配置springMVC设置   创建spmvc-servlet.xml在WEB-INF目录下

<?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:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd">

<!-- spring可以自动去扫描base-pack下面的包或者子包下面的java文件,如果扫描到有Spring的相关注解的类，则把这些类注册为Spring的bean -->
<context:component-scan base-package="com.l.controller" />

<!-- 配置处理映射器 -->
<bean
class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" />

<!-- 配置处理器适配器 -->
<bean
class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter" />

<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>

（3）创建controller类  com.l.controller.UserController.java

package com.l.controller;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.servlet.ModelAndView;

import com.l.dao.UserDao;
import com.l.entity.User;

@Controller
public class UserController {
@RequestMapping("/findUser")
public ModelAndView findUser(int id) {
ModelAndView mv = new ModelAndView();
ApplicationContext context = new ClassPathXmlApplicationContext("applicationContext.xml");
UserDao userDao = (UserDao) context.getBean("userDaoImpl");
User user = userDao.findUserById(id);
mv.addObject("name", user.getName());
mv.addObject("address", user.getAddress());
mv.setViewName("findUser");
return mv;
}

@RequestMapping("/")
public ModelAndView index() {
ModelAndView mv = new ModelAndView();
mv.setViewName("index");
return mv;
}
}

4.根据返回的视图名称来新建相关的jsp文件    

   配置文件中的路径是/WEB-INF/jsp/    新建jsp文件夹

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>Insert title here</title>
</head>
<body>
<center>
<form action="findUser" method="post">
请输入id：<input type="text" name="id"> <br />
<input type="submit" value="确定" />
</form>
</center>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!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>Insert title here</title>
</head>
<body>
<h1>${requestScope.name }</h1>
<h1>${requestScope.address }</h1>
</body>
</html>