Struts 2:處理一個form多個submit-优快云博客

本文介绍了一个Struts2框架中实现多个按钮提交功能的例子。通过自定义Action类和配置文件，使得每个按钮可以触发不同的方法。此外，还展示了如何通过拦截器获取HttpServletRequest对象。

例如以下實例:

1.主頁面:more_submit.jsp,該頁面有兩個submit,但在同一個Action類中執行;

 1 <%@ page language="java" contentType="text/html; charset=BIG5"
 2     pageEncoding="BIG5"%>
 3 <%@ taglib prefix="s" uri="/struts-tags" %>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 <html>
 6 <head>
 7 <meta http-equiv="Content-Type" content="text/html; charset=BIG5">
 8 <title>My Jsp "hello.jsp" starting page</title>
 9 </head>
10 <body>
11     <s:form action="submit.action">
12         <s:textfield name="msg" label="輸入內容"></s:textfield>
13         <s:submit name="save" value="保存" align="left" method="save"></s:submit>
14         <s:submit name="print" value="打印" align="left" method="print"></s:submit>
15     </s:form>
16 </body>
17 </html>

2.Action類,該類要注意兩點:(1)save和print方法必須存在,否則會拋出java.lang.NoSuchMethodException異常;(2)在Struts 2 的Action動作的execute方法中,無法訪問request對象,因此,Struts 2的Action類需要實現一個Struts2自帶的攔截器來獲得request對象,攔截器為:org.apache.struts2.interceptor.ServletRequestAware;

 1 package action;
 2 
 3 import javax.servlet.http.*;
 4 
 5 import com.opensymphony.xwork2.ActionSupport;
 6 import org.apache.struts2.interceptor.*;
 7 
 8 //save和print方法必須存在,否則會拋出java.lang.NoSuchMethodException異常
 9 
10 public class MoreSubmitAction extends ActionSupport implements ServletRequestAware {
11     /**
12      * 
13      */
14     private static final long serialVersionUID = 1L;
15     private String msg;
16     public String getMsg() {
17         return msg;
18     }
19 
20     public void setMsg(String msg) {
21         this.msg = msg;
22     }
23 
24     private javax.servlet.http.HttpServletRequest request;
25     
26     //獲得HttpServletRequest對象
27     public void setServletRequest(HttpServletRequest request)
28     {
29         this.request = request;
30     }
31     
32     //處理save submit按鈕的動作
33     public String save() throws Exception
34     {
35         request.setAttribute("result", "成功保存["+msg+"]");
36         return "save";
37     }
38     
39     //處理print submit按鈕的動作
40     public String print() throws Exception
41     {
42         request.setAttribute("result", "成功打印["+msg+"]");
43         return "print";
44     }
45 }

3.配置Struts2 Action

1     <package name="demo" extends="struts-default">
2         <action name="submit" class="action.MoreSubmitAction">
3             <result name="save">/result.jsp</result>
4             <result name="print">/result.jsp</result>
5         </action>
6     </package>

4.編寫結果頁:result.jsp

 1 <%@ page language="java" contentType="text/html; charset=BIG5"
 2     pageEncoding="BIG5"%>
 3 <%@ taglib prefix="s" uri="/struts-tags" %>
 4 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
 5 <html>
 6 <head>
 7 <meta http-equiv="Content-Type" content="text/html; charset=BIG5">
 8 <title>提交結果</title>
 9 </head>
10 <body>
11     <h1>
12         ${msg}
13     </h1>
14 </body>
15 </html>