SSM框架整合

开始学习SSM，现在来整理一下SSM框架整合。
SSM框架，Spring mvc + Spring + mybatis，先大概概括一下这三个框架。
关于这个SSM框架整合的学习，我是从一篇博客上学习的，现在是基于机子的理解写的。不过还是贴上地址，也是一篇十分好的文章
http://blog.csdn.net/yipanbo/article/details/45644751

Spring mvc 4.2.5.RELEASE

MVC框架，与Strusts2相比，首先比较好的一点就是能与Spring完美整合。除了学习用法，我个人觉得最重要的就是学习这个MVC框架的设计思想。

Spring 4.2.5.RELEASE

主要就是IoC(依赖注入)，AOP(面向切面)，目前我对于此也是一知半解，就不说什么了

mybatis 3.3.0

轻量级ORM框架

---

接下来，就是SSM框架的整合（使用的是MyEclipse,用Maven管理）

目录结构

图为完整目录结构。
在src/mian/resources目录下，一共有3个配置文件，spring-mybatis.xml包含spring,mybatis的配置，dispatcherServlet-servlet.xml为spring-mvc的配置，log4j2.xml为log4j2的配置，一个资源文件jdbc.properteis，包含关于基本的jdbc连接和数据源的属性

---

一、Maven所引入的jar包

<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>MyWebDemo</groupId>    <artifactId>MyWebDemo</artifactId>    <version>0.0.1-SNAPSHOT</version>    <packaging>war</packaging>    <name>MyWebDemo</name>    <description />    <properties>        <!-- 资源配置的编码环境 -->        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <!--spring使用的版本 -->        <spring.version>4.2.5.RELEASE</spring.version>        <!--mybatis使用的版本 -->        <mybatis.version>3.3.0</mybatis.version>        <!--log4j的使用版本 -->        <log4j.version>2.5</log4j.version>    </properties>    <dependencies>        <!--javaee api -->        <dependency>            <groupId>javax</groupId>            <artifactId>javaee-api</artifactId>            <version>7.0</version>            <scope>provided</scope>        </dependency>        <!--jstl的核心包 -->        <dependency>            <groupId>org.glassfish.web</groupId>            <artifactId>javax.servlet.jsp.jstl</artifactId>            <version>1.2.2</version>        </dependency>        <!--spring的核心包 -->        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-context</artifactId>            <version>${spring.version}</version>        </dependency>        <!--spring mvc -->        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-webmvc</artifactId>            <version>${spring.version}</version>        </dependency>        <!--spring jdbc -->        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-jdbc</artifactId>            <version>${spring.version}</version>        </dependency>        <!--spring测试 -->        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-test</artifactId>            <version>${spring.version}</version>        </dependency>        <!--spring end -->        <!--mybatis核心包 -->        <dependency>            <groupId>org.mybatis</groupId>            <artifactId>mybatis</artifactId>            <version>${mybatis.version}</version>        </dependency>        <!--mybatis与spring整合的包 -->        <dependency>            <groupId>org.mybatis</groupId>            <artifactId>mybatis-spring</artifactId>            <version>1.2.2</version>        </dependency>        <!--myabtis end -->        <!--mysql连接的jar包 -->        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <version>5.1.38</version>        </dependency>        <!--导入dbcp的jar包，用来在applicationContext.xml中配置数据库 -->        <dependency>            <groupId>commons-dbcp</groupId>            <artifactId>commons-dbcp</artifactId>            <version>1.2.2</version>        </dependency>        <!--数据库 end  -->        <!--导入log4j的jar包  -->        <dependency>            <groupId>org.apache.logging.log4j</groupId>            <artifactId>log4j-api</artifactId>            <version>${log4j.version}</version>        </dependency>        <dependency>            <groupId>org.apache.logging.log4j</groupId>            <artifactId>log4j-core</artifactId>            <version>${log4j.version}</version>        </dependency>        <!--用于格式化对象，便于输入  -->        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>fastjson</artifactId>            <version>1.1.41</version>        </dependency>        <!--日志配置 end  -->        <!--解释json  -->        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-databind</artifactId>            <version>2.2.0</version>        </dependency>        <!--用于测试  -->        <dependency>            <groupId>junit</groupId>            <artifactId>junit</artifactId>            <version>4.11</version>            <!--标记只用于测试，发布时不含该报  -->            <scope>test</scope>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <artifactId>maven-compiler-plugin</artifactId>                <version>2.3.2</version>                <configuration>                    <source>1.7</source>                    <target>1.7</target>                </configuration>            </plugin>            <plugin>                <artifactId>maven-war-plugin</artifactId>                <version>2.2</version>                <configuration>                    <version>3.1</version>                    <failOnMissingWebXml>false</failOnMissingWebXml>                </configuration>            </plugin>        </plugins>    </build></project>

---

二、Spring与mybatis的整合

jdbc.properties

用于配置jdbc的基本属性，和数据源的属性

---

spring-mybatis.xml

spring与mybatis的完美整合

<?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 http://www.springframework.org/schema/context/spring-context-4.2.xsd">    <!--自动扫描，扫描在指定包目录下的注释  -->    <context:component-scan base-package="com.example"></context:component-scan>    <!--引入所需要的资源文件，本项目中，引入的就是jdbc.properties  -->    <bean id="propertyConfigurer"        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"        lazy-init="default">        <!--向location属性注入jdbc.properties的位置  -->        <property name="location" value="classpath:jdbc.properties"></property>    </bean>    <!--设置数据源  -->    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"        abstract="false" lazy-init="default" autowire="default"        destroy-method="close">        <!--设置driver  -->        <property name="driverClassName" value="${driver}"></property>        <!--数据库的url  -->        <property name="url" value="${url}"></property>        <!--数据库的用户名  -->        <property name="username" value="${username}"></property>        <!--数据库的密码  -->        <property name="password" value="${password}"></property>        <!--初始化连接大小  -->        <property name="initialSize" value="${initialSize}"></property>        <!--连接池最大连接数量  -->        <property name="maxActive" value="${maxActive}"></property>        <!--连接池最大空间  -->        <property name="maxIdle" value="${maxIdle}"></property>        <!--连接池最小空闲  -->        <property name="minIdle" value="${minIdle}"></property>        <!--获取连接最大等待时间  -->        <property name="maxWait" value="${maxWait}"></property>    </bean>    <!--spring与mybatis的完美整合，负责于与数据库建立会话  -->    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"        abstract="false" lazy-init="default" autowire="default">        <property name="dataSource" ref="dataSource"></property>        <!--设置mybatis的配置文件的位置  -->    </bean>    <!--扫描mybatis的映射文件，不需配置mapper.xml,直接配置映射接口即可  -->    <bean id="mapperScannerConf" class="org.mybatis.spring.mapper.MapperScannerConfigurer"        abstract="false" lazy-init="default" autowire="default">        <!--扫描mybatis映射接口的包  -->        <property name="basePackage" value="com.example.dao"></property>        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"></property>    </bean>    <!--设置事务管理  -->    <bean id="tansatcionManager"        class="org.springframework.jdbc.datasource.DataSourceTransactionManager"        abstract="false" lazy-init="default" autowire="default">        <property name="dataSource" ref="dataSource"></property>    </bean></beans>

---

log4j2.xml的配置

为了方便调试，一般会使用日志记录，输出信息。
log4j的配置基本上是通用的。
这里用的是log4j2，我开始打算用properties配置的，但是貌似并不能。
当然也可以用1.x的版本。
具体的log4j配置，贴个链接吧

http://blog.csdn.net/zhshulin/article/details/37937365

<?xml version="1.0" encoding="UTF-8"?><Configuration status="WARN">    <!--将日志输入到控制台  -->    <Appenders>        <Console name="Console" target="SYSTEM_OUT">            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n" />        </Console>    </Appenders>    <!--日志打印的级别  -->    <Loggers>        <Root level="ALL">            <AppenderRef ref="Console" />        </Root>    </Loggers></Configuration>

---

三、JUnit测试

测试一下spring与mybatis的整合效果。
日后在开发中，完成相关的模块的工作，也应该先调试。

数据库表

pojo类

package com.example.pojo;public class User {    private String userId;    private String userName;    private String password;    public String getUserId() {        return userId;    }    public void setUserId(String userId) {        this.userId = userId;    }    public String getUserName() {        return userName;    }    public void setUserName(String userName) {        this.userName = userName;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    @Override    public String toString() {        return "User [userId=" + userId + ", userName=" + userName                + ", password=" + password + "]";    }}

---

接下来编写mybatis的mapper接口

package com.example.dao;import java.util.List;import org.apache.ibatis.annotations.Select;import com.example.pojo.User;/** * mybaits的mapper接口 * */public interface IUserDao {    //每个方法对应相应的sql语句    @Select("SELECT * FROM user WHERE userid = #{userid}")    public User selectOneUserByUserId(String userid);    @Select("SELECT * FROM user")    public List<User> selectUserList();}

业务层接口

package com.example.service;import java.util.List;import com.example.pojo.User;public interface IUserService {    public User getUserByUserId(String userid);    public List<User> getAllUsers();}

业务层实现类

package com.example.service.impl;import java.util.List;import javax.annotation.Resource;import org.springframework.stereotype.Service;import com.example.dao.IUserDao;import com.example.pojo.User;//Service对应业务层实现类，而且名字必须为"userService"@Service("userService")public class UserServiceImpl implements IUserService {    //控制反转，使用该注释后，由spring容器获得该属性的实例化控制权    @Resource    private IUserDao userDao;    @Override    public User getUserByUserId(String userid) {        // TODO Auto-generated method stub        return this.userDao.selectOneUserByUserId(userid);    }    @Override    public List<User> getAllUsers() {        // TODO Auto-generated method stub        return this.userDao.selectUserList();    }}

---

测试

package myTest;import javax.annotation.Resource;import org.apache.logging.log4j.LogManager;import org.apache.logging.log4j.Logger;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;import com.alibaba.fastjson.JSON;import com.example.pojo.User;import com.example.service.IUserService;//表示继承了SpringJUnit4ClassRunner类  @RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(locations = { "classpath:spring-mybatis.xml" })public class TestMyBatis {    private static Logger logger = LogManager.getLogger(TestMyBatis.class);    @Resource    private IUserService userService;    @Test    public void test() {        User user = userService.getUserByUserId("141542254");        logger.info(JSON.toJSONString(user));    }}

测试结果

说一下，这里因为方便没有对密码做相关处理，实际开发中，最低限度都要用MD5处理密码，再存入数据库。不然明文存储密码，会被人打死。

---

四、整合Spring Mvc

配置dispathcerServlet-servlet.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 http://www.springframework.org/schema/context/spring-context-4.2.xsd">    <!--扫描指定的包，查找由@Controller注释的控制器 -->    <context:component-scan base-package="com.example.controller"></context:component-scan>    <!-- 解释json，同时避免IE执行AJAX时，返回JSON出现下载文件 -->    <bean id="mappingJackson2HttpMessageConverter"        class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter"        abstract="false" lazy-init="default" autowire="default">        <property name="supportedMediaTypes">            <list>                <value>text/html;charset=UTF-8</value>            </list>        </property>    </bean>    <!--启动spring mvc的注解功能，完成请求和注解POJO的映射，与RequestMappingHandlerAdapter互相协作 -->    <!--当用户通过域名访问，将映射到相应的Controller  -->    <bean id="requestMappingHandlerMapping"        class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping"        abstract="false" lazy-init="default" autowire="default">    </bean>    <!--启动spring mvc的注解功能，完成请求和注解POJO的映射，与RequestMappingHandlerMapping -->    <!--将RequestMappingHandlerMapping返回的Controller适配，然后调用Controller的处理方法  -->    <bean id="requestMappingHandlerAdapter"        class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter"        abstract="false" lazy-init="default" autowire="default">        <property name="messageConverters">            <list>                <!-- Json转换器 -->                <ref bean="mappingJackson2HttpMessageConverter" />            </list>        </property>    </bean>    <!--用于支持Servlet、Jsp的视图解析 -->    <bean id="internalResourceViewResolver"        class="org.springframework.web.servlet.view.InternalResourceViewResolver"        abstract="false" lazy-init="default" autowire="default">        <!--JstlView表示Jsp模板页面需要使用Jstl标签库  -->        <property name="viewClass"            value="org.springframework.web.servlet.view.JstlView">        </property>        <!--查找视图页面的前缀和后缀(前缀[视图名]后缀) -->        <property name="prefix" value="/WEB-INF/jsp/"></property>        <property name="suffix" value=".jsp"></property>    </bean></beans>

---

web.xml配置

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns="http://xmlns.jcp.org/xml/ns/javaee"    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"    id="WebApp_ID" version="3.1">    <display-name>MyWebDemo</display-name>    <welcome-file-list>        <welcome-file>index.html</welcome-file>        <welcome-file>index.htm</welcome-file>        <welcome-file>index.jsp</welcome-file>        <welcome-file>default.html</welcome-file>        <welcome-file>default.htm</welcome-file>        <welcome-file>default.jsp</welcome-file>    </welcome-file-list>    <!--上下文加载监听器，spring监听器  -->    <listener>        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>    </listener>    <!--上下文的配置文件  -->    <context-param>        <param-name>contextConfigLocation</param-name>        <param-value>classpath:spring-mybatis.xml</param-value>    </context-param>    <!--前端处理器  -->    <servlet>        <servlet-name>dispatcherServlet</servlet-name>        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>        <!--前端处理器的配置文件  -->        <init-param>            <param-name>contextConfigLocation</param-name>            <param-value>classpath:dispatcherServlet-servlet.xml</param-value>        </init-param>        <!--表示启动容器时，初始化该servelt  -->        <load-on-startup>1</load-on-startup>        <async-supported>true</async-supported>    </servlet>    <servlet-mapping>        <servlet-name>dispatcherServlet</servlet-name>        <url-pattern>/</url-pattern>    </servlet-mapping>    <!--编码过滤器  -->    <filter>        <filter-name>encodingFilter</filter-name>        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>        <async-supported>true</async-supported>        <init-param>            <param-name>encoding</param-name>            <param-value>UTF-8</param-value>        </init-param>    </filter>    <filter-mapping>        <filter-name>encodingFilter</filter-name>        <url-pattern>/*</url-pattern>    </filter-mapping></web-app>

---

页面控制器的代码

package com.example.controller;import java.util.List;import javax.annotation.Resource;import org.springframework.stereotype.Controller;import org.springframework.ui.Model;import org.springframework.web.bind.annotation.RequestMapping;import com.example.pojo.User;import com.example.service.IUserService;@Controller@RequestMapping("/user")public class UserController {    @Resource    private IUserService userService;    @RequestMapping("/showUser")    public String toIndex(Model model) {        List<User> users = userService.getAllUsers();        model.addAttribute("users", users);        //返回的是视图(一般为jsp)的名称        return "showUser";    }}

---

View，jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>测试</title></head><body>    <c:forEach items="${users}" var="user">    ${user}<br>    </c:forEach></body></html>

测试结果

---

SSM框架的整合，基本上到此完成了，最后贴上一个简单的Spring mvc的工作流程图，加深理解，在配置时也更得心应手。