Struts2入门实例

web.xml

 

<? xml version="1.0" encoding="UTF-8" ?>
< web-app  version ="2.5"  
    xmlns ="http://java.sun.com/xml/ns/javaee"  
    xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance"  
    xsi:schemaLocation ="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" >
     < filter >
       < filter-name > struts2 </ filter-name >
       < filter-class > org.apache.struts2.dispatcher.FilterDispatcher </ filter-class >
     </ filter >
     < filter-mapping >
       < filter-name > struts2 </ filter-name >
       < url-pattern > /* </ url-pattern >
     </ filter-mapping >


</ web-app >

 srtuts.xml (WEB-INF/classes下)

 

<? xml version="1.0" encoding="GBK"  ?>
<! DOCTYPE struts PUBLIC
        "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
        "http://struts.apache.org/dtds/struts-2.0.dtd" >

< struts >
     < package  name ="struts"  extends ="struts-default" >
        < action  name ="Login"  class ="HelloWorld.LoginAction" >
          < result  name ="success" > /helloworld/welcome.jsp </ result >
          < result  name ="error" > /helloworld/error.jsp </ result >
        </ action >
     </ package >
</ struts >

 

Action：

 

package  HelloWorld;

import  com.opensymphony.xwork2.Action;
import  com.opensymphony.xwork2.ActionContext;

public   class  LoginAction  implements  Action ... {
  private String username;
  private String password;
  private String[] books;
  public String[] getBooks() ...{
    return books;
}
public void setBooks(String[] books) ...{
    this.books = books;
}
public String execute() throws Exception...{
      if(this.getUsername().equals("admin")&&this.getPassword().equals("1234"))...{
          ActionContext.getContext().getSession().put("user", this.getUsername());
          BookService bs=new BookService();
          this.setBooks(bs.getBooks());
          return SUCCESS;
      }else...{
          return ERROR;
      }
  }
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;
}
  
}

 

BookService.java

 

package  HelloWorld;

public   class  BookService  ... {
  private String[] books=new String[]...{
          "Spring 2.0",
          "Hibernate 3.2",
          "Struts 2.0"
  };
  public String[] getBooks()...{
      return books;
  }
}

 

index.jsp

 

<% ... @ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="gb2312" %>
<% ... @ taglib prefix="s" uri="/struts-tags"  %>
< html >
   < head >  
     < title ></ title >
   </ head >
   < body >       
      < s:form  action ="Login" >
        < s:textfield  name ="username"  label ="用户名" ></ s:textfield >
        < s:password  name ="password"  label ="密码" ></ s:password >
        < s:submit  value ="login" ></ s:submit >
      </ s:form >                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
   
   </ body >
</ html >

 

welcome.jsp

 

<% ... @ page language="java" contentType="text/html; charset=gb2312"
    pageEncoding="gb2312" %>
<% ... @ page isELIgnored="false"  %>
    
<% ... @ taglib prefix="s" uri="/struts-tags"  %>
<% ... @ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"  %>
< html >
   < head >  
     < title ></ title >
   </ head >
   < body >                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           
   欢迎${sessionScope.user}登陆
    < c:out  value ="${requestScope.now}" ></ c:out >
    < br >
    < table  border ="1" >
      < s:iterator  value ="books"  status ="index" >
          < s:if  test ="#index.odd==true" >
            < tr  style ="background-color=#cccccc" >
          </ s:if >
          < s:else >
            < tr >
          </ s:else >
          < td > 书名: </ td >
          < td >< s:property /></ td >
        </ tr >
      </ s:iterator >
    </ table >
   </ body >
</ html >