• （九）Struts2 防重复提交

    所有的学习我们必须先搭建好Struts2的环境（1、导入对应的jar包，2、web.xml，3、struts.xml）

    第一节：重复提交示例演示

     struts.xml

     1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
 4     "http://struts.apache.org/dtds/struts-2.0.dtd">
 5 
 6 <struts>
 7     
 8     <package name="manager" extends="struts-default">
 9         
10         <action name="student" class="com.wishwzp.action.StudentAction" method="add">
11             <result name="success">/success.jsp</result>
12            
13             
14         </action>
15         
16     </package>
17  
18 </struts>

     Student.java

     1 package com.wishwzp.model;
 2 
 3 public class Student {
 4 
 5     private String name;
 6     private String age;
 7     
 8     public String getName() {
 9         return name;
10     }
11     public void setName(String name) {
12         this.name = name;
13     }
14     public String getAge() {
15         return age;
16     }
17     public void setAge(String age) {
18         this.age = age;
19     }
20     
21     @Override
22     public String toString() {
23         return "Student [name=" + name + ", age=" + age + "]";
24     }
25     
26     
27 }

    StudentAction.java

     1 package com.wishwzp.action;
 2 
 3 import com.wishwzp.model.Student;
 4 import com.opensymphony.xwork2.ActionSupport;
 5 
 6 public class StudentAction extends ActionSupport{
 7 
 8     /**
 9      * 
10      */
11     private static final long serialVersionUID = 1L;
12     
13     private Student student;
14     
15     public Student getStudent() {
16         return student;
17     }
18 
19     public void setStudent(Student student) {
20         this.student = student;
21     }
22 
23     public String add() throws Exception {
24         System.out.println("开始添加学生："+student);
25         Thread.sleep(5000);
26         System.out.println(student.getName()+"添加完成");
27         return SUCCESS;
28     }
29 
30 }

    student.jsp

     1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 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=UTF-8">
 8 <title>Insert title here</title>
 9 </head>
10 <body>
11 
12 <form action="student" method="post" >
13 
14     姓名：<input type="text" name="student.name"/><br/>
15     年龄：<input type="text" name="student.age"/><br/>
16     <input type="submit" value="提交"/>
17 </form>
18 </body>
19 </html>

    success.jsp

     1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 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=UTF-8">
 8 <title>Insert title here</title>
 9 </head>
10 <body>
11 学生添加成功！
12 </body>
13 </html>

    结果显示：

     

     

    如果我们反复的提交的话，后台就会反复提交很多次的数据，而这些数据都会提交到后台的，我们现在要避免这样的情况发生。

    这样我们第二节就可以防这样的重复提交

    第二节：使用<s:token/>标签防重复提交

    <s:token></s:token> ：加在form 里；

    使用token 拦截器：

    在struts.xml必须配置

    <interceptor-ref name="token"></interceptor-ref>

    <interceptor-ref name="defaultStack"></interceptor-ref>

    <result name="invalid.token">/student.jsp</result> ：在struts.xml 里配置，假如出现重复提交，则直接回到页面；

    <s:actionerror/>：在页面上显示错误信息；

    例子： 

    struts.xml

     1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
 4     "http://struts.apache.org/dtds/struts-2.0.dtd">
 5 
 6 <struts>
 7     
 8     
 9     <package name="manager" extends="struts-default">
10 
11         <action name="student" class="com.wishwzp.action.StudentAction" method="add">
12             <result name="success">/success.jsp</result>
13             <!-- 在struts.xml 里配置，假如出现重复提交，则直接回到页面 -->
14             <result name="invalid.token">/student.jsp</result>
15             
16             <!-- 使用token 拦截器 -->
17             <interceptor-ref name="token"></interceptor-ref>
18             <interceptor-ref name="defaultStack"></interceptor-ref>
19             
20         </action>
21         
22     </package>
23  
24 </struts>

    Student.java

     1 package com.wishwzp.model;
 2 
 3 public class Student {
 4 
 5     private String name;
 6     private String age;
 7     
 8     public String getName() {
 9         return name;
10     }
11     public void setName(String name) {
12         this.name = name;
13     }
14     public String getAge() {
15         return age;
16     }
17     public void setAge(String age) {
18         this.age = age;
19     }
20     
21     @Override
22     public String toString() {
23         return "Student [name=" + name + ", age=" + age + "]";
24     }
25     
26     
27 }

    StudentAction.java

     1 package com.wishwzp.action;
 2 
 3 import com.wishwzp.model.Student;
 4 import com.opensymphony.xwork2.ActionSupport;
 5 
 6 public class StudentAction extends ActionSupport{
 7 
 8     /**
 9      * 
10      */
11     private static final long serialVersionUID = 1L;
12     
13     private Student student;
14     
15     public Student getStudent() {
16         return student;
17     }
18 
19     public void setStudent(Student student) {
20         this.student = student;
21     }
22 
23     public String add() throws Exception {
24         System.out.println("开始添加学生："+student);
25         Thread.sleep(5000);
26         System.out.println(student.getName()+"添加完成");
27         return SUCCESS;
28     }
29 
30 }

    student.jsp

     1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 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=UTF-8">
 8 <title>Insert title here</title>
 9 </head>
10 <body>
11 <s:actionerror/>
12 <form action="student" method="post" >
13     <s:token></s:token>
14     姓名：<input type="text" name="student.name"/><br/>
15     年龄：<input type="text" name="student.age"/><br/>
16     <input type="submit" value="提交"/>
17 </form>
18 </body>
19 </html>

    success.jsp

     1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 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=UTF-8">
 8 <title>Insert title here</title>
 9 </head>
10 <body>
11 学生添加成功！
12 </body>
13 </html>

    结果显示：

     

     

    这样使用防重复提交拦截器，我们不管在前端页面按多少次提交，后天数据就一个数据，不会出现像上面很多次的数据了。

    不过这样的我们可以看到这样的错误信号，我们可不可以直接无视这样的防重复提交呢！这里我们第三节就讲的这个。

    第三节：使用tokenSession 拦截器防重复提交

    tokenSesssion 拦截器直接无视重复提交的请求；

    <interceptor-ref name="tokenSession"></interceptor-ref>

    <interceptor-ref name="defaultStack"></interceptor-ref>

    例子：

    struts.xml

     1 <?xml version="1.0" encoding="UTF-8" ?>
 2 <!DOCTYPE struts PUBLIC
 3     "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
 4     "http://struts.apache.org/dtds/struts-2.0.dtd">
 5 
 6 <struts>
 7     
 8     
 9     <package name="manager" extends="struts-default">    
10 
11         <action name="student" class="com.wishwzp.action.StudentAction" method="add">
12             <result name="success">/success.jsp</result>
13             
14             <interceptor-ref name="tokenSession"></interceptor-ref>
15             <interceptor-ref name="defaultStack"></interceptor-ref>
16             
17         </action>
18 
19     </package>
20  
21 </struts>

    Student.java

     1 package com.wishwzp.model;
 2 
 3 public class Student {
 4 
 5     private String name;
 6     private String age;
 7     
 8     public String getName() {
 9         return name;
10     }
11     public void setName(String name) {
12         this.name = name;
13     }
14     public String getAge() {
15         return age;
16     }
17     public void setAge(String age) {
18         this.age = age;
19     }
20     
21     @Override
22     public String toString() {
23         return "Student [name=" + name + ", age=" + age + "]";
24     }
25     
26     
27 }

    StudentAction.java

     1 package com.wishwzp.action;
 2 
 3 import com.wishwzp.model.Student;
 4 import com.opensymphony.xwork2.ActionSupport;
 5 
 6 public class StudentAction extends ActionSupport{
 7 
 8     /**
 9      * 
10      */
11     private static final long serialVersionUID = 1L;
12     
13     private Student student;
14     
15     public Student getStudent() {
16         return student;
17     }
18 
19     public void setStudent(Student student) {
20         this.student = student;
21     }
22 
23     public String add() throws Exception {
24         System.out.println("开始添加学生："+student);
25         Thread.sleep(5000);
26         System.out.println(student.getName()+"添加完成");
27         return SUCCESS;
28     }
29 
30 }

    student.jsp

     1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 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=UTF-8">
 8 <title>Insert title here</title>
 9 </head>
10 <body>
11 <s:actionerror/>
12 <form action="student" method="post" >
13     <s:token></s:token>
14     姓名：<input type="text" name="student.name"/><br/>
15     年龄：<input type="text" name="student.age"/><br/>
16     <input type="submit" value="提交"/>
17 </form>
18 </body>
19 </html>

    success.jsp

     1 <%@ page language="java" contentType="text/html; charset=UTF-8"
 2     pageEncoding="UTF-8"%>
 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=UTF-8">
 8 <title>Insert title here</title>
 9 </head>
10 <body>
11 学生添加成功！
12 </body>
13 </html>

    结果显示：

    这样的话我们不管在前端页面提交多少次，后台也只有一个数据，而且我们自己在前端页面也无法感受到，是不是很神奇呢！
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  • 原文地址：https://www.cnblogs.com/wishwzp/p/5472617.html
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