struts2结果类型

采取请求转发的方式（dispatcher，默认情况）完成表单内容的添加会造成内容的重复插入；而采取重定向的方式（redirectAction）实现数据的添加不会导致数据的重复插入

   /result.jsp
   /login.jsp
  

 

result.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>

 
 
  
   username: ${requestScope.username }

   password: ${requestScope.password }

   age: ${requestScope.age }

   date: ${requestScope.date }

  
 session:${sessionScope.hello }
   
  
 

注意由于request和session的区别，redirect方式时不显示

“  username: ${requestScope.username }

   password: ${requestScope.password }

   age: ${requestScope.age }

   date: ${requestScope.date }

”

 而dispatcher则全显示.

 

redirectAction方式：携带参数传递 （重要）

 

action1.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
 
 

 

 username:

 password:

 
 

>
 

struts.xml

   
   action2
   ${username}
   ${password}
   ${usernameAndPassword}
   
   
     
  
   
   
    /action2.jsp
   
   

Action1.java

package com.shengsiyuan.struts2;

import com.opensymphony.xwork2.ActionSupport;

public class Action1 extends ActionSupport
{
 private String username ;
 private String password ;
 private String usernameAndPassword ;
 public String getUsernameAndPassword() {
  return usernameAndPassword;
 }
 public void setUsernameAndPassword(String usernameAndPassword) {
  this.usernameAndPassword = usernameAndPassword;
 }
 public String getUsername() {
  return username;
 }
 public void setUsername(String username) {
  this.username = username;
 }
 public String getPassword() {
  return password;
 }
 public void setPassword(String password) {
  this.password = password;
 }
 @Override
 public String execute() throws Exception {
  this.usernameAndPassword= this.username + this.password ;
  return SUCCESS ;
 }
}

Action2.java

package com.shengsiyuan.struts2;

import com.opensymphony.xwork2.ActionSupport;

public class Action2 extends ActionSupport {

 private String username ;
 private String password ;
 private String usernameAndPassword ;
 public String getUsername() {
  return username;
 }
 public void setUsername(String username) {
  this.username = username;
 }
 public String getPassword() {
  return password;
 }
 public void setPassword(String password) {
  this.password = password;
 }
 public String getUsernameAndPassword() {
  return usernameAndPassword;
 }
 public void setUsernameAndPassword(String usernameAndPassword) {
  this.usernameAndPassword = usernameAndPassword;
 }
 @Override
 public String execute() throws Exception {
  return SUCCESS ;
 }
}

action2.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
< prefix = "s" uri = "/struts-tags"  %>


 
 
username:

password:

usernameandpassword
 

chain类型：

若将以上改为chain  即

   
   action2
   ${username}
   ${password}
   ${usernameAndPassword}
   
   
     
  
   
   
    /action2.jsp
   

则在最终显示jsp页面只显示username 和password，不现实usernameAndPassword内容。即以下内容只与redirectAction方式有关，与chain等方式无关：（即仅为redirecAction的参数）

${username}
   ${password}
   ${usernameAndPassword}
   

防止表单重复提交有2种方式：

1通过重定向

2通过Session Token(Session令牌)