最近空闲时间，自己打算复习复习Spring MVC，于是使用Maven+Spring MVC+Redis搭建了一个项目，全当是做一个知识回顾。在这个过程当中，也遇到了各种各样的问题，在这里和大家一起分享一下，如有遇到类似问题还没有解决的，希望能帮到大家。下面我将一步步贴出源代码以及总结遇到的一个个问题。
1、项目目录结构
2.pom.xml
<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>4.0.0</modelVersion>
<groupId>com.tutu.love</groupId>
<artifactId>guitu</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>guitu Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<spring.version>4.1.4.RELEASE</spring.version>
</properties>
<dependencies>
<!-- MyBatis相关 -->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.0</version>
</dependency>
<!-- MySQL相关 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.36</version>
</dependency>
<dependency>
<groupId>c3p0</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.1.2</version>
</dependency>
<!-- Spring相关，这里的spring.version就是上方声明的版本号，这样引用更方便修改和维护 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${spring.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-ibatis</artifactId>
<version>2.0.8</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${spring.version}</version>
</dependency>
<!-- 测试相关 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- Servlet相关 -->
<dependency>
<groupId>tomcat</groupId>
<artifactId>servlet-api</artifactId>
<version>5.5.23</version>
</dependency>
<!-- Log相关 -->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<!-- Redis相关 -->
<dependency>
<groupId>redis.clients</groupId>
<artifactId>jedis</artifactId>
<version>2.0.0</version>
</dependency>
<!-- 其他 -->
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
</dependencies>
<build>
<finalName>guitu</finalName>
</build>
</project>
注：其中涉及到ibatis和mysql的依赖，该实例不会涉及，后续会用到，故保留。
3、web.xml
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-*.xml</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
<!--配置Sring MVC的核心控制器DispatcherServlet -->
<!-- 这样配置把所有.do的请求转发到DispatcherServlet控制中心,DispatcherServlet会默认加载 wib-inf
下的 dispatcherServlet-servlet.xml,根据里面的配置再到相应的controller -->
<servlet>
<servlet-name>dispatcher</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<!-- 修改了加载xml的位置 -->
<param-value>classpath:spring-servlet.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<!--为DispatcherServlet建立映射 -->
<servlet-mapping>
<servlet-name>dispatcher</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- session超时定义,单位为分钟 -->
<session-config>
<session-timeout>30</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>
4、Spring相关配置之spring-common.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:jee="http://www.springframework.org/schema/jee"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/jee
http://www.springframework.org/schema/jee/spring-jee-4.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-4.1.xsd">
<bean id="PropertiesConfigurer"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:log4j.properties</value>
<value>classpath:jdbc.properties</value>
</list>
</property>
</bean>
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<property name="driverClass" value="${jdbc.driverClassName}" />
<property name="jdbcUrl" value="${jdbc.url}" />
<property name="user" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
</bean>
<!-- SqlSessionFactory -->
<bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="configLocation" value="classpath:mybatis-config.xml" />
</bean>
<!-- Mybatis sql session -->
<bean id="sqlSession" class="org.mybatis.spring.SqlSessionTemplate">
<constructor-arg index="0" ref="sqlSessionFactory" />
</bean>
<!-- Mybatis mapper scanner, scans for java mapper -->
<bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
<property name="basePackage" value="com.tu.dao" />
<property name="sqlSessionTemplateBeanName" value="sqlSession" />
</bean>
</beans>
5、Spring相关配置值spring-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:jee="http://www.springframework.org/schema/jee"
xmlns:context="http://www.springframework.org/schema/context" xmlns:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.1.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.0.xsd
http://www.springframework.org/schema/jee
http://www.springframework.org/schema/jee/spring-jee-4.1.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.1.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-4.1.xsd">
<context:annotation-config/>
<context:component-scan base-package="com.tu.controller" />
<mvc:annotation-driven/>
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix">
<value>/WEB-INF/pages/</value>
</property>
<property name="suffix">
<value>.jsp</value>
</property>
</bean>
</beans>
6、具体控制器实现HelloworldController
package com.tu.controller;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.servlet.ModelAndView;
import com.tu.redis.RedisUtil;
@Controller
@RequestMapping("/test")
public class HelloworldController{
@RequestMapping("/hello")
public ModelAndView sayHello(ModelMap model) {
String username = RedisUtil.getJedisInstance().get("myname");
model.addAttribute("message", "Hello World, I'm "+username+".");
return new ModelAndView("hello");
}
@RequestMapping("/change")
public ModelAndView changeName(ModelMap model,@RequestParam("name") String name) {
RedisUtil.getJedisInstance().set("myname", name);
String username = RedisUtil.getJedisInstance().get("myname");
model.addAttribute("message", "Hello World, I'm "+username+".");
return new ModelAndView("hello");
}
}
7、由于用到了Redis内存数据库来运行这个实例，这里贴出自己封装的获取Redis公共类(Java中使用Jedis)
package com.tu.redis;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPool;
import redis.clients.jedis.JedisPoolConfig;
public class RedisUtil {
private static Jedis jedis;//非切片客户端连接
private static JedisPool jedisPool;//非切片连接池
/**
* 初始化非切片池
*/
private static void initialPool() {
//池基本配置
JedisPoolConfig config = new JedisPoolConfig();
config.setMaxActive(20);
config.setMaxIdle(5);
config.setMaxWait(100001);
config.setTestOnBorrow(false);
jedisPool = new JedisPool(config, "192.168.142.156", 6379);
}
public static Jedis getJedisInstance() {
if (jedis == null) {
initialPool();
return jedisPool.getResource();
} else {
return jedis;
}
}
}
8、JSP页面hello.jsp
<%@ page contentType="text/html;charset=UTF-8" pageEncoding="UTF-8" isELIgnored="false" %>
<!DOCTYPE html>
<html>
<body style="align:center">
<h2>${message}</h2>
<a href = "../test/change?name=William">Change Name</a>
</body>
</html>
9、浏览器中访问：http://localhost:8080/guitu/test/hello
遇到的问题总结如下：
1、完成了相关的配置以及控制器编写后，访问请求的时候进不去controller，分析了各种原因也没有解决(该情况下用的是Spring 3.0)，后来换了Spring 4.1.4.RELEASE，问题居然没有了；这个还有待继续研究；
2、解决了不能访问控制器之后，访问请求的时候，虽然视图成功返回，但是页面上的EL表达式却没有解决，问题原因：eclipse版本原因，禁用了EL表达式，@Page 中加入isELIgnored="false"解决问题；
3、控制器中多个方法问题，初次测试一个方法没有问题，当再次添加方法却不能请求新增的方法。问题原因：缺少了相关配置，在spring-servlet.xml中增加如下配置完美解决问题：
<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />
作为业余自己尝试的小实例，写得不好的或者有问题的地方，还希望大家指出来，大家共同进步。其中需要大家特别注意的地方，我用红色加粗进行了标记，更加清晰。
这里附上GitHub地址：https://github.com/williamjava/demo
具体源代码可参考Demo