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
{
public class User
private String username;
private String password;
private String[] books;
public String[] getBooks()
{
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
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