Struts2的Collection和Map支持

struts2提供了从页面直接封装到List的功能，实现起来有两个办法

1.使用泛型定义集合中的对象类型
2.配合配置文件定义集合中的对象类型

User.java

package  HelloWorld;

public   class  User  ... {
    private String username;
      private String password;
      private String[] books;
      public String[] getBooks() ...{
            return books;
        }
        public void setBooks(String[] books) ...{
            this.books = books;
        }
        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;
        }
}

 LoginAction.java （不使用泛型，使用配置文件定义集合中对象的类型）

 

 

package  HelloWorld;

import  java.util.List;

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

public   class  LoginAction  implements  Action ... {
 
 
private String tip;

private List users;





public List getUsers() ...{
    return users;
}

public void setUsers(List users) ...{
    this.users = users;
}

public String execute() throws Exception...{
    //用第一个user做逻辑判断
      if(((User)this.getUsers().get(0)).getUsername().equals("admin")&&((User)this.getUsers().get(0)).getPassword().equals("1234"))...{
          ActionContext.getContext().getSession().put("user", ((User)this.getUsers().get(0)).getUsername());
          BookService bs=new BookService();
          ((User)this.getUsers().get(0)).setBooks(bs.getBooks());
          this.setTip("welcome welcome");
          return SUCCESS;
      }else...{
          return ERROR;
      }
  }

public String getTip() ...{
    return tip;
}
public void setTip(String tip) ...{
    this.tip = tip;
}


  
}

 

LoginAction_conversion.properties (放在和LoginAction同目录)

Element_users=HelloWorld.User 

表示集合中的Element类型是User,如果是Map类型，则还需要定义Key_users=****

 

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 ="users[0].username"  key ="username" ></ s:textfield >
        < s:textfield  name ="users[0].password"  key ="password" ></ s:textfield >
        < s:textfield  name ="users[1].username"  key ="username" ></ s:textfield >
        < s:textfield  name ="users[1].password"  key ="password" ></ s:textfield >
        < s:submit  value ="login" ></ s:submit >
      </ s:form >                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
   
   </ body >
</ html >

 

如果使用泛型定义List users，则可以省略LoginAction-conversion.properties文件

private List<List> users