ssm整合练习

SSM =SpringMVC +Spring +Mybatis
需要的jar包链接链接：http://pan.baidu.com/s/1c10kx7U 密码：1u18
我们先来看看文件结构图

有点多吗？没关系，我们可以一步一步的来

首先我们在mysql中创建一个数据库SSM
然后创建一个表d_user

create table d_user(
id       varchar(20),
username varchar(20),
age  varchar(20)
);

插入一条数据
insert into d_user values(“1”,”hello”,”25”);
好了数据库创建完毕了

然后我们肯定先需要创建一个User.java

package com.model;

public class User {
    int id;
    String username;
    String age;
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }

}

然后我们在来创建mybatis的映射表UserMapper.java和userMapper.xml

先创建一个UserMapper.java

package com.mapper;

import java.util.List;

import com.model.User;

public interface UserMapper {
    String findAge(String id);
}

再来创建userMapper.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.mapper.UserMapper">

    <select id="findAge" parameterType="String" resultType="String">
        select age from d_user WHERE id=#{id} 
    </select>
</mapper>

好了到这里为止，Mybatis的东西基本搭建完毕，当然后续还要配置文件

下面我们创建UserService接口

package com.service;

import java.util.List;

import com.model.User;

public interface UserService {
    String findAge(String id);
}

再来创建它的实现UserServiceImpl.java

package com.service;

import java.util.List;

import javax.annotation.Resource;

import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import com.mapper.UserMapper;
import com.model.User;
import com.service.UserService;

@Service
@Transactional
public class UserServiceImpl implements UserService{   
    @Resource
    public UserMapper userMapper;
    @Override
    public String findAge(String id) {
        // TODO Auto-generated method stub
        String age =userMapper.findAge(id);
        return age;
    }

}

注意注解是必须的，生成bean使用，大家可以搜索一下依赖注入又称控制反转了解一下

好了，现在我们可以到控制层了，我们来写一个UserController

package com.controller;

import java.util.List;

import javax.servlet.http.HttpServletRequest;

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 com.model.User;
import com.service.UserService;

@Controller
public class UserController {

    @Autowired
    private UserService userService;

    @RequestMapping(value="/hello.do")
    public String find(HttpServletRequest request)
    {
        String age=userService.findAge("1");
        System.out.println(age);//如果实验成功，在控制台会打印年龄25
        return "index";
    }
}

下面我们来个jsp看看 hello.jsp

<%@ 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>
<form action="hello.do" method="post">
    hello:<input type="text" name="userName"/>
    <input type="submit" value="提交" /> 
</form>
</body>
</html>

再写一个index.jsp
只需要在body中添加一个456即可

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<p>456</p>
</body>
</html>

下面我们来配置文件
先配置web.xml

<?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">
 <welcome-file-list>
    <welcome-file>hello.jsp</welcome-file>
  </welcome-file-list>
    <!-- 加载Spring容器配置 -->
    <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

    <!-- 设置Spring容器加载所有的配置文件的路径 -->
    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath*:config/applicationContext.xml</param-value>
    </context-param>

    <!-- 配置SpringMVC核心控制器 -->
    <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*:config/spring-mvc.xml</param-value>
        </init-param>
        <!-- 启动加载一次 -->  
        <load-on-startup>1</load-on-startup>
    </servlet>

    <!--为DispatcherServlet建立映射 -->
    <servlet-mapping>
        <servlet-name>springMVC</servlet-name>
        <!-- 此处可以可以配置成*.do -->
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

    <!-- 防止Spring内存溢出监听器 -->
    <listener>
        <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
    </listener>

    <!-- 解决工程编码过滤器 -->
    <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>
</web-app>

我们在配置spring-mvc.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-4.0.xsd
    http://www.springframework.org/schema/mvc
    http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">

    <!-- 注解扫描包 -->
    <context:component-scan base-package="com" />

    <!-- 开启注解 -->
    <mvc:annotation-driven />

    <!-- 定义跳转的文件的前后缀 ，视图模式配置-->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <!-- 这里的配置我的理解是自动给后面action的方法return的字符串加上前缀和后缀，变成一个 可用的url地址 -->
        <property name="prefix" value="/" />
        <property name="suffix" value=".jsp" />
    </bean>
</beans>

配置mybatis-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>
    <typeAliases>
        <typeAlias alias="User" type="com.model.User"/>
    </typeAliases>
    <mappers>
        <mapper resource="com/mapper/userMapper.xml" />
    </mappers>
</configuration>

在配置最后一个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" xmlns:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context-4.0.xsd
        http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-4.0.xsd">

    <!-- 1. 数据源 : DriverManagerDataSource -->
    <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/SSM" />
        <property name="username" value="root" />
        <property name="password" value="123" />
    </bean>

    <!--
        2. mybatis的SqlSession的工厂: SqlSessionFactoryBean dataSource:引用数据源

        MyBatis定义数据源,同意加载配置
    -->
    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <property name="dataSource" ref="dataSource"></property>
        <property name="configLocation" value="classpath:config/mybatis-config.xml" /> 
    </bean>

    <!--
        3. mybatis自动扫描加载Sql映射文件/接口 : MapperScannerConfigurer sqlSessionFactory

        basePackage:指定sql映射文件/接口所在的包（自动扫描）
    -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.mapper"></property>
        <property name="sqlSessionFactory" ref="sqlSessionFactory"></property>
    </bean>

    <!--
        4. 事务管理 : DataSourceTransactionManager dataSource:引用上面定义的数据源
    -->
    <bean id="txManager"
        class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
        <property name="dataSource" ref="dataSource"></property>
    </bean>

    <!-- 5. 使用声明式事务
         transaction-manager：引用上面定义的事务管理器
     -->
    <tx:annotation-driven transaction-manager="txManager" />

</beans>

要注意数据的账号和密码要修改成你自己的，好了大功告成，然后我们运行hello.jsp,随意输入一个字符比如123，然后提交，如果成功读取，会在控制台输出25.

posted @ 2017-09-08 23:38 大向无形阅读(484) 评论(0) 编辑收藏举报

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