本人在学习Maven之余，为了深入了解Maven的用法，决定创建一个SSM整合实例。项目是自己实际搭建，真实可用。
-
技术介绍
SSM（Spring+SpringMVC+Mybatis）
Spring是一种轻量级框架，这是众所周知的，开发者只需要把一些常用的如日志，事务管理在配置文件中申明，能大大降低代码的耦合，减少代码侵入。他的核心是 IOC（控制反转）和AOP（面向切面编程），具体大家想了解深入可以上网查阅，这里不再多讲。
SpringMVC顾名思义就是运用Spring框架使用MVC思想实现，他的核心就是前端控制器（DispatcherServlet），它的工作原理是：
1、客户端发出一个http请求给web服务器，web服务器对http请求进行解析，如果匹配DispatcherServlet的请求映射路径（在web.xml中指定），web容器将请求转交给
DispatcherServlet.
2、DipatcherServlet接收到这个请求之后将根据请求的信息（包括URL、Http方法、请求报文头和请求参数Cookie等）以及HandlerMapping的配置找到处理请求的处理 器（Handler）。
3-4、DispatcherServlet根据HandlerMapping找到对应的Handler,将处理权交给Handler（Handler将具体的处理进行封装），再由具体的HandlerAdapter对Handler进行 具体的调用。
5、Handler对数据处理完成以后将返回一个ModelAndView()对象给DispatcherServlet。
6、Handler返回的ModelAndView()只是一个逻辑视图并不是一个正式的视图，DispatcherSevlet通过ViewResolver将逻辑视图转化为真正的视图View。
7、Dispatcher通过model解析出ModelAndView()中的参数进行解析最终展现出完整的view并返回给客户端。
Mybatis是支持定制化 SQL、存储过程以及高级映射的优秀的持久层框架。MyBatis 避免了几乎所有的 JDBC 代码和手动设置参数以及获取结果集。MyBatis 可以对 配置和原生Map使用简单的 XML 或注解，将接口和 Java 的 POJOs(Plain Old Java Objects,普通的 Java对象)映射成数据库中的记录。
- 数据库创建
这里是MySQL数据库，数据库表创建如下图：
CREATE TABLE tb_user( id int(11) NOT NULL AUTO_INCREMENT, user_name varchar(40) NOT NULL, password varchar(40) NOT NULL, age int(4) NOT NULL, PRIMARY KEY(id)) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
- SSM整合步骤
完整项目整合如下图所示：
1.创建Maven的Web项目（这个在上一篇文章已经讲解了，这里就不再多讲）
2.配置pom.xml,代码如下：
<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/maven-v4_0_0.xsd"> <modelVersion>4.0.0modelVersion> <groupId>cn.tempgroupId> <artifactId>maven-web-demo02artifactId> <packaging>warpackaging> <version>0.0.1-SNAPSHOTversion> <name>maven-web-demo02 Maven Webappname> <url>http://maven.apache.orgurl> <properties> <srping.version>4.0.2.RELEASEsrping.version> <mybatis.version>3.2.8mybatis.version> <slf4j.version>1.7.12slf4j.version> <log4j.version>1.2.17log4j.version> properties> <dependencies> <dependency> <groupId>junitgroupId> <artifactId>junitartifactId> <version>3.8.1version> <scope>testscope> dependency> <dependency> <groupId>javax.servletgroupId> <artifactId>javax.servlet-apiartifactId> <version>3.1.0version> <scope>providedscope> dependency> <dependency> <groupId>javaxgroupId> <artifactId>javaee-apiartifactId> <version>7.0version> <scope>providedscope> dependency> <dependency> <groupId>org.springframeworkgroupId> <artifactId>spring-testartifactId> <version>${srping.version}version> dependency> <dependency> <groupId>org.springframeworkgroupId> <artifactId>spring-coreartifactId> <version>${srping.version}version> dependency> <dependency> <groupId>org.springframeworkgroupId> <artifactId>spring-oxmartifactId> <version>${srping.version}version> dependency> <dependency> <groupId>org.springframeworkgroupId> <artifactId>spring-txartifactId> <version>${srping.version}version> dependency> <dependency> <groupId>org.springframeworkgroupId> <artifactId>spring-jdbcartifactId> <version>${srping.version}version> dependency> <dependency> <groupId>org.springframeworkgroupId> <artifactId>spring-aopartifactId> <version>${srping.version}version> dependency> <dependency> <groupId>org.springframeworkgroupId> <artifactId>spring-contextartifactId> <version>${srping.version}version> dependency> <dependency> <groupId>org.springframeworkgroupId> <artifactId>spring-context-supportartifactId> <version>${srping.version}version> dependency> <dependency> <groupId>org.springframeworkgroupId> <artifactId>spring-expressionartifactId> <version>${srping.version}version> dependency> <dependency> <groupId>org.springframeworkgroupId> <artifactId>spring-ormartifactId> <version>${srping.version}version> dependency> <dependency> <groupId>org.springframeworkgroupId> <artifactId>spring-webartifactId> <version>${srping.version}version> dependency> <dependency> <groupId>org.springframeworkgroupId> <artifactId>spring-webmvcartifactId> <version>${srping.version}version> dependency> <dependency> <groupId>org.mybatisgroupId> <artifactId>mybatisartifactId> <version>${mybatis.version}version> dependency> <dependency> <groupId>org.mybatisgroupId> <artifactId>mybatis-springartifactId> <version>1.2.2version> dependency> <dependency> <groupId>mysqlgroupId> <artifactId>mysql-connector-javaartifactId> <version>5.1.35version> dependency> <dependency> <groupId>commons-dbcpgroupId> <artifactId>commons-dbcpartifactId> <version>1.4version> dependency> <dependency> <groupId>jstlgroupId> <artifactId>jstlartifactId> <version>1.2version> dependency> <dependency> <groupId>log4jgroupId> <artifactId>log4jartifactId> <version>${log4j.version}version> dependency> <dependency> <groupId>org.slf4jgroupId> <artifactId>slf4j-apiartifactId> <version>${slf4j.version}version> dependency> <dependency> <groupId>org.slf4jgroupId> <artifactId>slf4j-log4j12artifactId> <version>${slf4j.version}version> dependency> <dependency> <groupId>com.alibabagroupId> <artifactId>fastjsonartifactId> <version>1.2.6version> dependency> <dependency> <groupId>org.codehaus.jacksongroupId> <artifactId>jackson-mapper-aslartifactId> <version>1.9.13version> dependency> <dependency> <groupId>commons-fileuploadgroupId> <artifactId>commons-fileuploadartifactId> <version>1.3.1version> dependency> <dependency> <groupId>commons-iogroupId> <artifactId>commons-ioartifactId> <version>2.4version> dependency> <dependency> <groupId>commons-codecgroupId> <artifactId>commons-codecartifactId> <version>1.10version> dependency> dependencies> <build> <finalName>maven-web-demo02finalName> build> project>
3.创建jdbc.properties文件
driver=com.mysql.jdbc.Driver url=jdbc:mysql://127.0.0.1:3306/orcl username=root password=123qweasd initialSize=0 maxActive=20 maxIdle=20 minIdle=1 maxWait=60000
4.创建日志属性文件
#\u5B9A\u4E49LOG\u8F93\u51FA\u7EA7\u522B
log4j.rootLogger=INFO,Console,File
#\u5B9A\u4E49\u65E5\u5FD7\u8F93\u51FA\u76EE\u7684\u5730\u4E3A\u63A7\u5236\u53F0
log4j.appender.Console=org.apache.log4j.ConsoleAppender
log4j.appender.Console.Target=System.out
#\u53EF\u4EE5\u7075\u6D3B\u5730\u6307\u5B9A\u65E5\u5FD7\u8F93\u51FA\u683C\u5F0F\uFF0C\u4E0B\u9762\u4E00\u884C\u662F\u6307\u5B9A\u5177\u4F53\u7684\u683C\u5F0F
log4j.appender.Console.layout = org.apache.log4j.PatternLayout
log4j.appender.Console.layout.ConversionPattern=[%c] - %m%n
#\u6587\u4EF6\u5927\u5C0F\u5230\u8FBE\u6307\u5B9A\u5C3A\u5BF8\u7684\u65F6\u5019\u4EA7\u751F\u4E00\u4E2A\u65B0\u7684\u6587\u4EF6
log4j.appender.File = org.apache.log4j.RollingFileAppender
#\u6307\u5B9A\u8F93\u51FA\u76EE\u5F55
log4j.appender.File.File = logs/ssm.log
#\u5B9A\u4E49\u6587\u4EF6\u6700\u5927\u5927\u5C0F
log4j.appender.File.MaxFileSize = 10MB
# \u8F93\u51FA\u6240\u4EE5\u65E5\u5FD7\uFF0C\u5982\u679C\u6362\u6210DEBUG\u8868\u793A\u8F93\u51FADEBUG\u4EE5\u4E0A\u7EA7\u522B\u65E5\u5FD7
log4j.appender.File.Threshold = ALL
log4j.appender.File.layout = org.apache.log4j.PatternLayout
log4j.appender.File.layout.ConversionPattern =[%p] [%d{yyyy-MM-dd HH\:mm\:ss}][%c]%m%n
5.接下来创建Spring和MyBatis整合文件
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"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">
<context:component-scan base-package="com.sgcc.user" >
<context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
context:component-scan>
<bean id="propertyConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="classpath:jdbc.properties" />
bean>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="${driver}" />
<property name="url" value="${url}" />
<property name="username" value="${username}" />
<property name="password" value="${password}" />
<property name="initialSize" value="${initialSize}">property>
<property name="maxActive" value="${maxActive}">property>
<property name="maxIdle" value="${maxIdle}">property>
<property name="minIdle" value="${minIdle}">property>
<property name="maxWait" value="${maxWait}">property>
bean>
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="mapperLocations" value="classpath:com/sgcc/user/mapping/*.xml">property>
bean>
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.sgcc.user.dao" />
<property name="sqlSessionFactoryBeanName" value="sqlSessionFactory">property>
bean>
<bean id="transactionManager"
class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
<property name="dataSource" ref="dataSource" />
bean>
<tx:annotation-driven transaction-manager="transactionManager"/>
beans>
6.创建SpringMVC文件，如下代码
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">
<context:component-scan base-package="com.sgcc.user.controller"/>
<mvc:default-servlet-handler/>
<mvc:annotation-driven>mvc:annotation-driven>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/views/" />
<property name="suffix" value=".jsp" />
bean>
beans>
7.接下来就是各个业务文件了，如下图所示：
8.创建UserController文件，如下图所示：
package com.sgcc.user.controller;
import javax.annotation.Resource;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import com.sgcc.user.pojo.User;
import com.sgcc.user.service.UserService;
@Controller
public class UserController {
/**
* 使用@Autowired也可以，@Autowired默认按类型装配
* @Resource 默认按名称装配，当找不到与名称匹配的bean才会按类型装配。
*/
@Resource
private UserService userService;
/**
* 测试查询
*
* @param id
* @param model
* @return
*/
@RequestMapping("/showUser")
public String testtoshowUser(@RequestParam(value = "id") Integer id, Model model) {
System.out.println("id:" + id);
User user = userService.getUserById(id);
model.addAttribute("user", user);
return "showUser";
}
/**
* 测试添加数据
*
* @param id
* @param model
* @return
*/
@RequestMapping("/insertUser")
public String testinsertUser() {
User user = new User();
user.setUserName("李清照");
user.setPassword("3232322");
user.setAge(22);
int count = userService.insert(user);
System.out.println("插入" + count + "条数据成功");
return "showUser";
}
}
9.创建UserDao
package com.sgcc.user.dao; import com.sgcc.user.pojo.User; public interface UserDao { int deleteByPrimaryKey(Integer id); int insert(User record); int insertSelective(User record); User selectByPrimaryKey(Integer id); int updateByPrimaryKeySelective(User record); int updateByPrimaryKey(User record); }
10.创建UserMapper.xml文件，代码如下
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.sgcc.user.dao.UserDao">
<resultMap id="BaseResultMap" type="com.sgcc.user.pojo.User">
<id column="id" property="id" jdbcType="INTEGER" />
<result column="user_name" property="userName" jdbcType="VARCHAR" />
<result column="password" property="password" jdbcType="VARCHAR" />
<result column="age" property="age" jdbcType="INTEGER" />
resultMap>
<sql id="Base_Column_List">
id, user_name, password, age
sql>
<select id="selectByPrimaryKey" resultMap="BaseResultMap"
parameterType="java.lang.Integer">
select
<include refid="Base_Column_List" />
from tb_user
where id = #{id,jdbcType=INTEGER}
select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">
delete from
tb_user
where id = #{id,jdbcType=INTEGER}
delete>
<insert id="insert" parameterType="com.sgcc.user.pojo.User">
insert into tb_user (id,
user_name, password,
age)
values (#{id,jdbcType=INTEGER},
#{userName,jdbcType=VARCHAR},
#{password,jdbcType=VARCHAR},
#{age,jdbcType=INTEGER})
insert>
<insert id="insertSelective" parameterType="com.sgcc.user.pojo.User">
insert into tb_user
<trim prefix="(" suffix=")" suffixOverrides=",">
<if test="id != null">
id,
if>
<if test="userName != null">
user_name,
if>
<if test="password != null">
password,
if>
<if test="age != null">
age,
if>
trim>
<trim prefix="values (" suffix=")" suffixOverrides=",">
<if test="id != null">
#{id,jdbcType=INTEGER},
if>
<if test="userName != null">
#{userName,jdbcType=VARCHAR},
if>
<if test="password != null">
#{password,jdbcType=VARCHAR},
if>
<if test="age != null">
#{age,jdbcType=INTEGER},
if>
trim>
insert>
<update id="updateByPrimaryKeySelective" parameterType="com.sgcc.user.pojo.User">
update tb_user
<set>
<if test="userName != null">
user_name = #{userName,jdbcType=VARCHAR},
if>
<if test="password != null">
password = #{password,jdbcType=VARCHAR},
if>
<if test="age != null">
age = #{age,jdbcType=INTEGER},
if>
set>
where id = #{id,jdbcType=INTEGER}
update>
<update id="updateByPrimaryKey" parameterType="com.sgcc.user.pojo.User">
update tb_user
set
user_name = #{userName,jdbcType=VARCHAR},
password =
#{password,jdbcType=VARCHAR},
age = #{age,jdbcType=INTEGER}
where id =
#{id,jdbcType=INTEGER}
update>
mapper>
12.创建User类
package com.sgcc.user.pojo; public class User { private Integer id; private String userName; private String password; private Integer age; public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName == null ? null : userName.trim(); } public String getPassword() { return password; } public void setPassword(String password) { this.password = password == null ? null : password.trim(); } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } @Override public String toString() { return "User [id=" + id + ", userName=" + userName + ", password=" + password + ", age=" + age + "]"; } }
13.创建UserService接口
package com.sgcc.user.service; import com.sgcc.user.pojo.User; public interface UserService { //根据id查找 public User getUserById(Integer userid); //添加一条数据 public int insert(User user); }
14.创建UserServiceImpl实现类
package com.sgcc.user.service; import javax.annotation.Resource; import org.springframework.stereotype.Service; import org.springframework.transaction.annotation.Transactional; import com.sgcc.user.dao.UserDao; import com.sgcc.user.pojo.User; @Transactional @Service("userService") public class UserServiceImpl implements UserService { /** * 因为没有在spring的文件中显式的声明userService实现类，直接通过getBean得到 userService 会找不到 * 需要显式配置 @Service ("userService")，指定bean的名称 * 相当与*/ @Resource private UserDao userDao; public User getUserById(Integer userid) { return this.userDao.selectByPrimaryKey(userid); } @Override public int insert(User user) { return this.userDao.insert(user); } }
16.配置程序入口web.xml文件
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>maven-web-demo02display-name>
<filter>
<filter-name>encodingFilterfilter-name>
<filter-class>org.springframework.web.filter.CharacterEncodingFilterfilter-class>
<async-supported>trueasync-supported>
<init-param>
<param-name>encodingparam-name>
<param-value>UTF-8param-value>
init-param>
filter>
<filter-mapping>
<filter-name>encodingFilterfilter-name>
<url-pattern>/*url-pattern>
filter-mapping>
<context-param>
<param-name>contextConfigLocationparam-name>
<param-value>classpath:spring-mybatis.xmlparam-value>
context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
listener>
<servlet>
<servlet-name>springDispatcherServletservlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
<init-param>
<param-name>contextConfigLocationparam-name>
<param-value>classpath:springmvc.xmlparam-value>
init-param>
<load-on-startup>1load-on-startup>
servlet>
<servlet-mapping>
<servlet-name>springDispatcherServletservlet-name>
<url-pattern>/url-pattern>
servlet-mapping>
web-app>
18.创建前端页面，index.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 heretitle> head> <body> <a href="showUser?id=2">ShowUser pagea><br> <a href="insertUser">insertUser a> body> html>
19.创建showUser.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>测试title> head> <body> id:${user.id} <br> userName: ${user.userName} <br> password: ${user.password} <br> age: ${user.age} <br> body> html>
20启动服务，如下图所示：
