转自：https://www.cnblogs.com/ShawnYang/p/6681870.html
控制重复提交的方式：1、表单提交后页面重定向；2、Struts2.x token拦截器
大致流程：
例子：
index.jsp
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <% 4 String path = request.getContextPath(); 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 6 %> 7 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 8 <html> 9 <head> 10 <base href="<%=basePath %>"/> 11 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 12 <title>Hello Struts2</title> 13 </head> 14 <body> 15 <a href="input.action">输入用户信息</a> 16 </body> 17 </html>
input.jsp
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <% 4 String path = request.getContextPath(); 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 6 %> 7 <%@ taglib uri="/struts-tags" prefix="s" %> 8 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 9 <html> 10 <head> 11 <base href="<%=basePath %>"/> 12 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 13 <title>Hello Struts2</title> 14 </head> 15 <body> 16 <form action="user.action" method="post"> 17 name:<input type="text" name="name"/> 18 age:<input type="text" name="age"/> 19 <input type="submit" value="提 交"/> 20 <s:token></s:token> 21 </form> 22 </body> 23 </html>
addOK.jsp
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <% 4 String path = request.getContextPath(); 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 6 %> 7 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 8 <html> 9 <head> 10 <base href="<%=basePath %>"/> 11 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 12 <title>Hello Struts2</title> 13 </head> 14 <body> 15 addOK. 16 </body> 17 </html>
error.jsp
1 <%@ page language="java" contentType="text/html; charset=UTF-8" 2 pageEncoding="UTF-8"%> 3 <% 4 String path = request.getContextPath(); 5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 6 %> 7 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 8 <html> 9 <head> 10 <base href="<%=basePath %>"/> 11 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 12 <title>Hello Struts2</title> 13 </head> 14 <body> 15 严禁做重复的事！ 16 </body> 17 </html>
struts.xml
1 <?xml version="1.0" encoding="UTF-8" ?> 2 <!DOCTYPE struts PUBLIC 3 "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN" 4 "http://struts.apache.org/dtds/struts-2.3.dtd"> 5 6 <struts> 7 <constant name="struts.enable.DynamicMethodInvocation" value="true" /> 8 <constant name="struts.configuration.xml.reload" value="true"/> 9 10 <package name="test" namespace="/" extends="struts-default"> 11 12 <action name="input" class="com.bjsxt.action.InputAction"> 13 <result>/input.jsp</result> 14 </action> 15 16 <action name="user" class="com.bjsxt.action.UserAction"> 17 <result>/addOK.jsp</result> 18 <interceptor-ref name="defaultStack"></interceptor-ref> 19 <interceptor-ref name="token"></interceptor-ref> 20 <result name="invalid.token">/error.jsp</result> 21 </action> 22 23 </package> 24 25 </struts>
InputAction
1 package com.bjsxt.action;
2
3 import com.opensymphony.xwork2.ActionSupport;
4
5 public class InputAction extends ActionSupport {
6
7 private static final long serialVersionUID = -8003780600877800393L;
8
9 public String execute(){
10 return SUCCESS;
11 }
12
13 }
UserAction
1 package com.bjsxt.action;
2
3 import com.opensymphony.xwork2.ActionSupport;
4
5 public class UserAction extends ActionSupport {
6
7 private static final long serialVersionUID = -8003780600877800393L;
8
9 private String name;
10
11 private int age;
12
13 public String execute(){
14 System.out.println("a user added!");
15 return SUCCESS;
16 }
17
18 public String getName() {
19 return name;
20 }
21
22 public void setName(String name) {
23 this.name = name;
24 }
25
26 public int getAge() {
27 return age;
28 }
29
30 public void setAge(int age) {
31 this.age = age;
32 }
33
34 }