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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 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 |
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