Struts2使用OGNL表达式封装输入数据

我们在action中有一个封装好的user对象，其中有username和password两个属性

我们可以在页面上直接使用user,username作为输入框的名字，struts2可以直接把输入的username和password封装到user对象中，这点和webwork2如出一辙

 

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

 

package  HelloWorld;

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

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

  private User user;

public User getUser() ...{
    return user;
}

public void setUser(User user) ...{
    this.user = user;
}

public String execute() throws Exception...{
      if(this.getUser().getUsername().equals("admin")&&this.getUser().getPassword().equals("1234"))...{
          ActionContext.getContext().getSession().put("user", this.getUser().getUsername());
          BookService bs=new BookService();
          this.getUser().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;
}


  
}

index.jsp输入页面

 

<% ... @ 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 ="user.username"  key ="username" ></ s:textfield >
        < s:textfield  name ="user.password"  key ="password" ></ s:textfield >
        < s:submit  value ="login" ></ s:submit >
      </ s:form >                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
   
   </ body >
</ html >