SpringMVC 多控制器，静态资源访问，配置文件位置更改

SpringMVC 多控制器，静态资源访问，配置文件位置更改

1.配置文件名(springMVC-servlet.xml)称，位置更改:

上一篇博客中看到 是将 springMVC-servlet.xml 放置在 WEB-INF/springMVC-servlet.xml 下面的。这样做会有很多弊端(eg:不便于查找...)

为了配置方便和便于管理，我们将配置文件 springMVC-servlet.xml 放置在 src/config 目录下面。并且改名为 spring-servlet.xml.

为此我们需要在 web.xml 中指定该配置文件的位置

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 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_3_0.xsd"> <display-name></display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<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*.xml</param-value>
</init-param>
<!-- 加载优先级 调到最高 -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springMVC</servlet-name>
<!-- 过滤的内容 -->
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>

在<servlet></servlet>中添加<init-param>属性可以在项目初始化的时候加载

<init-param>
<param-name>contextConfigLocation</param-name>
<!-- 代码编译后存放的位置，spring* 表示以 spring 开头的所有文件 -->
<param-value>classpath*:config/spring*.xml</param-value>
</init-param>

package org.springframework.web.servlet;

@SuppressWarnings("serial")
public class DispatcherServlet extends FrameworkServlet {
/**
* Create a new {@code DispatcherServlet} that will create its own internal web
* application context based on defaults and values provided through servlet
* init-params. Typically used in Servlet 2.5 or earlier environments, where the only
* option for servlet registration is through {@code web.xml} which requires the use
* of a no-arg constructor.
* <p>Calling {@link #setContextConfigLocation} (init-param 'contextConfigLocation')
* will dictate which XML files will be loaded by the
* {@linkplain #DEFAULT_CONTEXT_CLASS default XmlWebApplicationContext}
* <p>Calling {@link #setContextClass} (init-param 'contextClass') overrides the
* default {@code XmlWebApplicationContext} and allows for specifying an alternative class,
* such as {@code AnnotationConfigWebApplicationContext}.
* <p>Calling {@link #setContextInitializerClasses} (init-param 'contextInitializerClasses')
* indicates which {@code ApplicationContextInitializer} classes should be used to
* further configure the internal application context prior to refresh().
* @see #DispatcherServlet(WebApplicationContext)
*/
public DispatcherServlet() {
super();
}
}

2.静态资源访问：

由于我们设置了 过滤内容为 <url-pattern>/</url-pattern> 即是对所有资源文件进行过率。可是在实际中我们不许要对一些静态资源(eg:CSS,JQuery,image等内容进行过滤)

<servlet-mapping>
<servlet-name>springMVC</servlet-name>
<!-- 过滤的内容 -->
<url-pattern>/</url-pattern>
</servlet-mapping>

因此我们需要设置专门的方法来对一些资源不进行过滤。

我们需要在 spring-servlet.xml 文件中进行设置

<!-- 设置不过滤内容，比如:css,jquery,img 等资源文件 -->
<mvc:resources location="/js/*" mapping="/js/**" />
<mvc:resources location="/img/*" mapping="/img/*" />

该步骤需要 添加 Spring 的 mvc 命名空间。

<?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:mvc="http://www.springframework.org/schema/mvc"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:cache="http://www.springframework.org/schema/cache"
xmlns:jdbc="http://www.springframework.org/schema/jdbc"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/context/spring-jdbc-3.2.xsd http://www.springframework.org/schema/cache http://www.springframework.org/schema/context/spring-cache-3.2.xsd"> <beans>

3.对于在同一个Conroller 中添加多个方法：

package com.aoeng.springmvc.controller;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.mvc.multiaction.MultiActionController;
public class MultiController extends MultiActionController
{
public ModelAndView add(HttpServletRequest request, HttpServletResponse response) {
System.out.println("-------add multi--------------");
Map map = new HashMap();
map.put("key1", "value1");
map.put("key2", "value2");
map.put("key3", "value3");
map.put("key4", "value4");
return new ModelAndView("/multi","map",map);
}
public ModelAndView execute(HttpServletRequest request, HttpServletResponse response){

return new ModelAndView("/multi");
}
}

在spring-servlet.xml 文件中需要添加

<bean name="/test/multi" class="com.aoeng.springmvc.controller.MultiController">
<!-- methodNameResolver 为 MultiController 类的父类 MultiActionController 中的属性 -->
<property name="methodNameResolver" ref="parameterMethodNameResolver" />

</bean>
<bean name="parameterMethodNameResolver" class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver">
<property name="paramName" value="do" /><!-- 次属性的值不改变，将会默认使用 action -->
</bean>

multi.jsp 文件为

<script type="text/javascript" src="js/jquery-1.4.2.min.js"></script>

<script type="text/javascript">
$(function(){
alert("hello");
});
</script>
</head>

<body>
${map }<br>
<c:forEach items="${map }" var="val">
${val.key } -------> ${val.value} <br />
</c:forEach>

<img  src="img/img.png">
</body>

访问结果为