2008-02-25

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

评论
发表评论

您还没有登录，请登录后发表评论

esffor
搜索本博客
最近加入圈子
存档
最新评论