SSM
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SSM初体验
这个简单的SSM项目我实在how2j网站上学习的，感兴趣可以前去学习，比较全面，最主要是有源代码提供下载，如果你照着打代码仍然编译失败，可以使用Beyond Compare来进行文件对比，我就是多次有细小的代码错误导致编译失败。
具体思路
- 首先浏览器上访问路径 /listCategory
- tomcat根据web.xml上的配置信息，拦截到了/listCategory，并将其交由DispatcherServlet处理。
- DispatcherServlet 根据springMVC的配置，将这次请求交由CategoryController类进行处理，所以需要进行这个类的实例化
- 在实例化CategoryController的时候，注入CategoryServiceImple
- 在实例化CategoryServiceImple的时候，又注入CategoryMapper
- 根据ApplicationContext.xml中的配置信息，讲CategoryMapper和Category.xml关联起来了。
- 这样拿到了实例化好了的CategoryController,并调用listCategory方法
- 在listCategory方法中，访问CategoryService,并获取数据，并把数据放在”cs”上，接着服务端跳转到listCategory.jsp去
- 最后在listCategory.jsp 中显示数据
代码演示
包结构
配置web.xml
<?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" xmlns:web="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_2_5.xsd" version="2.5"><!-- spring的配置文件--><context-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:applicationContext.xml</param-value></context-param><listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class></listener><!-- spring mvc核心：分发servlet --><servlet> <servlet-name>mvc-dispatcher</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- spring mvc的配置文件 --> <init-param> <param-name>contextConfigLocation</param-name> <param-value>classpath:springMVC.xml</param-value> </init-param> <load-on-startup>1</load-on-startup></servlet><servlet-mapping> <servlet-name>mvc-dispatcher</servlet-name> <url-pattern>/</url-pattern></servlet-mapping></web-app>配置springMVC.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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation="http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"> <context:annotation-config/> <context:component-scan base-package="com.zy.controller"> <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/> </context:component-scan> <mvc:annotation-driven /> <mvc:default-servlet-handler /> <!-- 视图定位 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView" /> <property name="prefix" value="/WEB-INF/jsp/" /> <property name="suffix" value=".jsp" /> </bean></beans>配置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:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:jdbc="http://www.springframework.org/schema/jdbc" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xsi:schemaLocation=" http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd"> <context:annotation-config /> <context:component-scan base-package="com.zy.service" /> <!--注释掉之前的数据库连接配置，改用线程池连接 --> <!-- <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName"> <value>com.mysql.jdbc.Driver</value> </property> <property name="url"> <value>jdbc:mysql://localhost:3306/how2java?characterEncoding=UTF-8</value> </property> <property name="username"> <value>root</value> </property> <property name="password"> <value>admin</value> </property> </bean> --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close"> <!-- 基本属性 url、user、password --> <property name="url" value="jdbc:mysql://localhost:3306/how2java?characterEncoding=UTF-8" /> <property name="username" value="root" /> <property name="password" value="admin" /> <property name="driverClassName" value="com.mysql.jdbc.Driver" /> <!-- 配置初始化大小、最小、最大 --> <property name="initialSize" value="3" /> <property name="minIdle" value="3" /> <property name="maxActive" value="20" /> <!-- 配置获取连接等待超时的时间 --> <property name="maxWait" value="60000" /> <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="60000" /> <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="300000" /> <property name="validationQuery" value="SELECT 1" /> <property name="testWhileIdle" value="true" /> <property name="testOnBorrow" value="false" /> <property name="testOnReturn" value="false" /> <!-- 打开PSCache，并且指定每个连接上PSCache的大小 --> <property name="poolPreparedStatements" value="true" /> <property name="maxPoolPreparedStatementPerConnectionSize" value="20" /> </bean> <bean id="sqlSession" class="org.mybatis.spring.SqlSessionFactoryBean"> <property name="typeAliasesPackage" value="com.zy.pojo" /> <property name="dataSource" ref="dataSource"/> <property name="mapperLocations" value="classpath:com/zy/mapper/*.xml"/> </bean> <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"> <property name="basePackage" value="com.zy.mapper"/> </bean></beans>创建实体包pojo下Category类
package com.zy.pojo;public class Category { private int id; private String name; 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 toString(){ return "Category [id=" + id+ ", name="+ name + "]"; }}mybatis框架应用创建Category.xml和对应的CategoryMapper.java接口
<?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.zy.mapper.CategoryMapper"> <insert id="add" parameterType="Category"> insert into category_ (name) values (#{name}) </insert> <delete id="delete" parameterType="Category" > delete from category_ where id= #{id} </delete> <select id="get" parameterType="_int" resultType="Category"> select * from category_ where id= #{id} </select> <update id="update" parameterType="Category" > update category_ set name=#{name} where id=#{id} </update> <select id="list" resultType="Category"> select * from category_ <if test="start!=null and count!=null"> limit #{start},#{count} </if> </select> <select id="total" resultType="int"> select count(*) from category_ </select> </mapper>package com.zy.mapper;import java.util.List;import com.zy.pojo.Category;import com.zy.util.Page;public interface CategoryMapper { public void add(Category category); public void delete(int id); public Category get(int id); public void update(Category category); public List<Category> list(); public int total(); public List<Category> list(Page page);}创建分页工具类
package com.zy.util;public class Page { int start = 0; int count = 5; int last = 0; public int getStart() { return start; } public void setStart(int start) { this.start = start; } public int getCount() { return count; } public void setCount(int count) { this.count = count; } public int getLast() { return last; } public void setLast(int end) { this.last = end; } public void caculateLast(int total){ if(total % count == 0 ){ last = total - count ; } else{ last = total - total%count; } }}创建service接口
package com.zy.service;import java.util.List;import com.zy.pojo.Category;import com.zy.util.Page;public interface CategoryService { List<Category> list(); List<Category> list(Page page); int total();}创建serviceimpl类继承service接口
package com.zy.service.impl;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import com.zy.mapper.CategoryMapper;import com.zy.pojo.Category;import com.zy.service.CategoryService;import com.zy.util.Page;@Servicepublic class CategoryServiceImpl implements CategoryService{ @Autowired CategoryMapper categoryMapper; public List<Category> list(){ return categoryMapper.list(); } @Override public List<Category> list(Page page) { return categoryMapper.list(page); } @Override public int total() { return categoryMapper.total(); }}最后创建Controller类
package com.zy.controller;import java.util.List;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView;import com.zy.pojo.Category;import com.zy.service.CategoryService;import com.zy.util.Page;//告诉spring MVC这是一个控制类@Controller@RequestMapping("")public class CategoryController { @Autowired CategoryService categoryService; @RequestMapping("listCategory")//映射网址后的地址，当mvc-dispatcher接收到这个地址后通知controller public ModelAndView listCategory(Page page){ ModelAndView modelAndView = new ModelAndView(); List<Category> cs = categoryService.list(page); int total = categoryService.total(); page.caculateLast(total); //放入转发参数 modelAndView.addObject("cs", cs); //放入jsp路径 modelAndView.setViewName("listCategory"); return modelAndView ; }}创建jsp页面
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" import="java.util.*"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <div style="width:500px;margin:0px auto;text-align:center"> <table align='center' border="1" cellspacing='0' bordercolor="red"> <tr > <td>id</td> <td>name</td> </tr> <c:forEach items="${cs}" var="c" varStatus="st"> <tr> <td>${c.id}</td> <td>${c.name}</td> </tr> </c:forEach> </table> <div style="text-align:center"> <a href="?start=0">首 页</a> <a href="?start=${page.start-page.count}">上一页</a> <a href="?start=${page.start+page.count}">下一页</a> <a href="?start=${page.last}">末 页</a> </div> </div>其它
- 项目的输出放在Web/WEB-INF/classes中
- 在eclipse中新建项目ssm，使用java project的方式，不要使用web dynamic project的方式。项目目录必须是e:\project\ssm，因为jar包路径的关系，使用其他项目路径会报错。
- lib中内容在此处下载：点我下载
总结
这是一个简单的小项目，初窥SSM门径，以前我都是使用的jsp/servlet的方式，现在了解了SSM的基本雏形，发觉简单了很多，而且更利于代码的修改和重构，更有利于理解设计者的思路。
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