struts 获取request_struts getrequest指定文字code

作者：笔触狂放9 | 2024-03-18 02:22:01

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struts getrequest指定文字code

当初没有添加获取request的代码，所以总是反应空指针异常

下面我就给出一个实例程序来演示如何处理有多个submit的form：

【第1步】实现主页面(more_submit.jsp)


<%@	page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
　<title></title>
</head>
<body>
　<s:form action="submit.action" >
	<s:textfield name="msg" label="请输入内容"></s:textfield>
	<s:submit name="save" method="save" value="保存"/> 
　      <s:submit name="print" method="print" value="打印" /> 
　</s:form>
　</body>
　</html>

在more_submit.jsp中有两个submit：保存和打印。其中分别通过method属性指定了要调用的方法：save和print。因此，在Action类中必须要有save和print方法。

【第2步】实现Action类（MoreSubmitAction）


package action;
 
import javax.servlet.http.HttpServletRequest;
 
import org.apache.struts2.ServletActionContext;
 
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
 
public class FirstAction extends ActionSupport {
	private String msg;
	
	public String getMsg() {
		return msg;
	}
 
	public void setMsg(String msg) {
		this.msg = msg;
	}
 
	// 处理savesubmit按钮动作
	public String save() throws Exception {
		HttpServletRequest request=ServletActionContext.getRequest();  
		request.setAttribute("result", "成功保存[" + msg + "]");
		return "save";
	}
 
	// 处理printsubmit按钮动作
	public String print() throws Exception {
		HttpServletRequest request=ServletActionContext.getRequest(); 
		request.setAttribute("result", "成功打印["+msg+"]");
		return "print";
	}
 
}

【第3步】配置Struts2 Action

struts.xml的代码如下：


<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">
    
<struts>
<package name="demo" extends="struts-default">
	<action name="submit" class="action.FirstAction">
  		<result name="save">/result.jsp</result>
  		<result name="print">/result.jsp</result>
	</action>
</package>
</struts>

【第4步】编写结果页（result.jsp）


<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'result.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
 
  </head>
  
  <body>
    <h1>${result }</h1>
  </body>
</html>

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