Struts2学习二----------访问Servlet API

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Struts2提供了三种方式去访问Servlet API

-ActionContext

-实现*Aware接口

-ServletActionContext

实例：

1.项目结构

 

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>org.struts</groupId>
	<artifactId>Struts2-ServletAPI</artifactId>
	<packaging>war</packaging>
	<version>0.0.1-SNAPSHOT</version>
	<name>Struts2-ServletAPI Maven Webapp</name>
	<url>http://maven.apache.org</url>
	
	<properties>
		<!-- 统一Struts2开发环境 -->
		<struts2.version>2.5.10</struts2.version>
	</properties>
	
	<dependencies>
		<!-- junit -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.12</version>
			<scope>test</scope>
		</dependency>
		<!-- Struts2 -->
		<dependency>
		    <groupId>org.apache.struts</groupId>
		    <artifactId>struts2-core</artifactId>
		    <version>${struts2.version}</version>
		</dependency>
		<!-- Servlet -->
		<dependency>
		    <groupId>javax.servlet</groupId>
		    <artifactId>javax.servlet-api</artifactId>
		    <version>3.1.0</version>
		</dependency>
	</dependencies>
	
	<build>
		<finalName>Struts2-ServletAPI</finalName>
	</build>
	
</project>

3.web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app 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"
		version="3.0" metadata-complete="true">
  
  	<!-- 配置Struts2过滤器 -->
	<filter>
		<filter-name>struts</filter-name>
		<filter-class>org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter</filter-class>
	</filter>
	<filter-mapping>
		<filter-name>struts</filter-name>
		<url-pattern>/*</url-pattern>
	</filter-mapping>
  
</web-app>

4.ServletAPIAction.java

package org.struts.action;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.ServletRequestAware;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class ServletAPIAction extends ActionSupport implements ServletRequestAware {

	private static final long serialVersionUID = 1L;
	
	private HttpServletRequest req1;
	private HttpServletRequest req2;
	private HttpServletRequest req3;
	
	/**
	 * struts2默认执行方法
	 */
	@Override
	public String execute() throws Exception {
		
		//第一种方式：ActionContext
		req1 = (HttpServletRequest) ActionContext.getContext()
				.get(org.apache.struts2.StrutsStatics.HTTP_REQUEST);
		//第三种方式：ServletActionContext
		req3 = ServletActionContext.getRequest();
		return SUCCESS;
		
	}
	
	//第二种方式：实现*Aware接口
	public void setServletRequest(HttpServletRequest request) {
		
		req2 = request;
		
	}

	public HttpServletRequest getReq1() {
		return req1;
	}

	public HttpServletRequest getReq2() {
		return req2;
	}

	public HttpServletRequest getReq3() {
		return req3;
	}

}

5.struts.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.5//EN"
    "http://struts.apache.org/dtds/struts-2.5.dtd">
<struts>

	<package name="servletAPI" extends="struts-default" namespace="/">
		<action name="servletAPI" class="org.struts.action.ServletAPIAction">
			<result>/success.jsp</result>
		</action>
	</package>

</struts>

6.success.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 here</title>
</head>
<body>
	第一种方式获取request：${req1 }<br/>
	第二种方式获取request：${req2 }<br/>
	第三种方式获取request：${req3 }
</body>
</html>

7.效果预览

参考：http://www.imooc.com/video/8997

posted @ 2017-05-02 14:34  禁忌夜色153  阅读(157)  评论(0)  编辑  收藏  举报