Struts2 ServletAPI的使用
在Struts2应用中，我们经常需要用到Servlet的API来帮助我们完成功能需求，有三种使用方式
1 方式一：ServletActionContext
在index.jsp添加表单，用于提交参数到Action：
<h3>使用ServletActionContext类</h3>
<form action="demo1.action" method="post">
姓名：<input type="text" name="name"/><br/>
性别：<input type="text" name="gender"/><br/>
年龄：<input type="text" name="age"/><br/>
<input type="submit" value="提交"/>
</form>
Action类，使用ServletActionContext获取HttpServletRequest，获取参数
package com.yiidian.action;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
/**
* 使用ServletActionContext类
* @author 一点教程(yiidian.com)
*
*/
public class Demo1Action extends ActionSupport{
@Override
public String execute() throws Exception {
//1.接收参数
HttpServletRequest request = ServletActionContext.getRequest();
String name = request.getParameter("name");
String gender = request.getParameter("gender");
String age = request.getParameter("age");
System.out.println(name);
System.out.println(gender);
System.out.println(age);
//2.共享数据到页面
//2.1 request域
request.setAttribute("request_data", "小苍");
//2.2 session域
request.getSession().setAttribute("session_data", "小风");
//2.3 application域（ServletContext）
ServletActionContext.getServletContext().setAttribute("application_data", "小泽");
return SUCCESS;
}
}
struts.xml配置
<?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="base" extends="struts-default" namespace="/">
<action name="demo1" class="com.yiidian.action.Demo1Action">
<result>/succ.jsp</result>
</action>
</package>
</struts>
最后，在succ.jsp获取数据
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>一点教程-成功页面</title>
</head>
<body>
${requestScope.request_data }<br/>
${sessionScope.session_data }<br/>
${applicationScope.application_data }<br/>
</body>
</html>
表单输入参数，提交表单，效果如下：
控制台打印：
3 方式二：ActionContext
在index.jsp添加表单，用于提交参数到Action：
<h3>使用ActionContext类</h3>
<form action="demo2.action" method="post">
姓名：<input type="text" name="name"/><br/>
性别：<input type="text" name="gender"/><br/>
年龄：<input type="text" name="age"/><br/>
<input type="submit" value="提交"/>
</form>
Action类，使用ActionContext接收请求参数
package com.yiidian.action;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.StrutsStatics;
import org.apache.struts2.dispatcher.HttpParameters;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
/**
* 使用ActionContext类
* @author 一点教程(yiidian.com)
*
*/
public class Demo2Action extends ActionSupport{
@Override
public String execute() throws Exception {
//1.接收参数
ActionContext context = ActionContext.getContext();
HttpParameters parameters = context.getParameters();
String name = parameters.get("name").getValue();
String gender = parameters.get("gender").getValue();
String age = parameters.get("age").getValue();
System.out.println(name);
System.out.println(gender);
System.out.println(age);
//2.共享数据到页面
//2.1 request域
HttpServletRequest request = (HttpServletRequest)context.get(StrutsStatics.HTTP_REQUEST);
request.setAttribute("request_data", "小苍");
//2.2 session域
context.getSession().put("session_data", "小风");
//2.3 application域
context.getApplication().put("application_data", "小泽");
return SUCCESS;
}
}
struts.xml配置
<action name="demo2" class="com.yiidian.action.Demo2Action">
<result>/succ.jsp</result>
</action>
表单输入参数，提交表单，效果如下：
控制台打印
3 方式三：接口注入方式
在index.jsp添加表单，用于提交参数到Action：
<h3>使用接口注入方式</h3>
<form action="demo3.action" method="post">
姓名：<input type="text" name="name"/><br/>
性别：<input type="text" name="gender"/><br/>
年龄：<input type="text" name="age"/><br/>
<input type="submit" value="提交"/>
</form>
Action类通过实现ServletRequestAware，ServletContextAware接口来注入HttpServletRequest
package com.yiidian.action;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.util.ServletContextAware;
import com.opensymphony.xwork2.ActionSupport;
/**
* 使用接口注入方式
* @author 一点教程(yiidian.com)
*
*/
public class Demo3Action extends ActionSupport implements ServletRequestAware,ServletContextAware{
private HttpServletRequest request;
private ServletContext application;
@Override
public String execute() throws Exception {
//1.接收参数
String name = request.getParameter("name");
String gender = request.getParameter("gender");
String age = request.getParameter("age");
System.out.println(name);
System.out.println(gender);
System.out.println(age);
//2.共享数据到页面
request.setAttribute("request_data", "小苍");
request.getSession().setAttribute("session_data", "小风");
application.setAttribute("application_data", "小泽");
return SUCCESS;
}
@Override
public void setServletRequest(HttpServletRequest request) {
this.request = request;
}
@Override
public void setServletContext(ServletContext context) {
this.application = context;
}
}
struts.xml配置
<action name="demo3" class="com.yiidian.action.Demo3Action">
<result>/succ.jsp</result>
</action>
表单输入参数，提交表单，效果如下：
控制台打印结果
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