关于结果处理类型input的代码演示-深入Struts2

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一 Input因为年龄输入错误自动跳转回输入界面

1、struts.xml

xml  version = "1.0"  encoding = "UTF-8"  ?>

DOCTYPE  struts  PUBLIC  "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"  " http://struts.apache.org/dtds/struts-2.1.dtd" ; >

< struts >

         < package  name = "default"  namespace = "/"  extends = "struts-default" >

                 < default-action-ref  name = "index" > default-action-ref >

                 < action  name = "index" >

                         < result > /error.jsp result >

                 action >

                

                 < action  name = "*_*_*"  method = "{2}"  class = "com.cakin.{3}.{1}Action" >

                         < result > /result.jsp result >

                         < result  name = "add" > /{2}. jsp result >

                         < result  name = "update" > /{2}. jsp result >

                 action >

                

                 < action  name = "LoginAction"  method = "login"  class = "com.cakin.action.LoginAction" >

                         < result > /success.jsp result >

                         < result  name = "input" > /login.jsp result >

                 action >

         package >

struts >    

2、User.java

package  com.cakin.po;

 

import  java.util.List;

 

public  class  User {

         private  String  username ;

        

         private  String  password ;

        

         private  int  age ;

        

         public  int  getAge() {

                 return  age ;

        }

         public  void  setAge( int  age) {

                 this . age  = age;

        }

         private  List  booklist ;

        

         public  List getBooklist() {

                 return  booklist ;

        }

         public  void  setBooklist(List booklist) {

                 this . booklist  = booklist;

        }

         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;

        }

}

3、login.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 'login.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" >

        

 

   head >

 

   < body >

         < form  action = "LoginAction.action"  method = "post" >

                用户名： < input  type = "text"  name = "username" >

                密码： < input  type = "password"  name = "password" >

                书籍1： < input  type = "text"  name = "booklist[0].username" >

                书籍2： < input  type = "text"  name = "booklist[1].username" >

                年龄： < input  type = "text"  name = "age" >

                 < input  type = "submit"  value = "提交"  />

         form >

   body >

html >

4、测试

 

 

二 通过addFieldError跳回到输入页码，并带错误提示

1、struts.xml

xml  version = "1.0"  encoding = "UTF-8"  ?>

DOCTYPE  struts  PUBLIC  "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN"  " http://struts.apache.org/dtds/struts-2.1.dtd" ; >

< struts >

         < package  name = "default"  namespace = "/"  extends = "struts-default" >

                 < default-action-ref  name = "index" > default-action-ref >

                 < action  name = "index" >

                         < result > /error.jsp result >

                 action >

                

                 < action  name = "*_*_*"  method = "{2}"  class = "com.cakin.{3}.{1}Action" >

                         < result > /result.jsp result >

                         < result  name = "add" > /{2}. jsp result >

                         < result  name = "update" > /{2}. jsp result >

                 action >

                

                 < action  name = "LoginAction"  method = "login"  class = "com.cakin.action.LoginAction" >

                         < result > /success.jsp result >

                         < result  name = "input" > /login.jsp result >

                 action >

         package >

struts >    

2、login.jsp

<%@  page  language = "java"  import = "java.util.*"  pageEncoding = "utf-8" %>

<%@  taglib  prefix = "s"  uri = "/struts-tags"  %>

<%

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 'login.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" >

        

 

   head >

 

   < body >

         < form  action = "LoginAction.action"  method = "post" >

                用户名： < input  type = "text"  name = "username" >< s:fielderror  name = "username" > s:fielderror >

                密码： < input  type = "password"  name = "password" >

                书籍1： < input  type = "text"  name = "booklist[0].username" >

                书籍2： < input  type = "text"  name = "booklist[1].username" >

                年龄： < input  type = "text"  name = "age" >

                 < input  type = "submit"  value = "提交"  />

         form >

   body >

html >

3、LoginAction

package com.cakin.action;

import com.cakin.po.User;

import com.opensymphony.xwork2.ActionSupport;

import com.opensymphony.xwork2.ModelDriven;

public class LoginAction extends ActionSupport implements ModelDriven{

    private User user =new User();

    public String login(){

        

        if(user.getUsername()==null

                ||"".equals(user.getUsername()))

        {

            this.addFieldError("username", "用户名为空");

            return INPUT;

        }

        

        System.out.println(user.getUsername());

        System.out.println(user.getBooklist().get(0).getUsername());

        System.out.println(user.getBooklist().get(1).getUsername());

        return SUCCESS;

    }

    @Override

    public User getModel() {

        // TODO Auto-generated method stub

        return user;

    }

}

4、测试

 

三 通过validate方法实现调回到输入页码

1、LoginAction.jsp

package com.cakin.action;

import com.cakin.po.User;

import com.opensymphony.xwork2.ActionSupport;

import com.opensymphony.xwork2.ModelDriven;

public class LoginAction extends ActionSupport implements ModelDriven{

    private User user =new User();

    public String login(){

        

        

        System.out.println(user.getUsername());

        System.out.println(user.getBooklist().get(0).getUsername());

        System.out.println(user.getBooklist().get(1).getUsername());

        return SUCCESS;

    }

    @Override

    public void validate() {

        // TODO Auto-generated method stub

        if(user.getUsername()==null

                ||"".equals(user.getUsername()))

        {

            this.addFieldError("username", "用户名为空");

            //return INPUT;

        }

    }

    @Override

    public User getModel() {

        // TODO Auto-generated method stub

        return user;

    }

}

 

2、测试

 

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