JSP的setProperty的使用方法

JSP的setProperty的使用方法

一 介绍

jsp:setProperty作用

给已经实例化的javabean对象的属性赋值，一共有四种形式。

二 四种形式

三 实例

1、login.jsp

%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8" %
%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%
 
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
 head
  base href="%=basePath%" rel="external nofollow" rel="external nofollow" 
  
  titleMy JSP 'login.jsp' starting page/title
  
    meta http-equiv="pragma" content="no-cache"
    meta http-equiv="cache-control" content="no-cache"
    meta http-equiv="expires" content="0"  
    meta http-equiv="keywords" content="keyword1,keyword2,keyword3"
    meta http-equiv="description" content="This is my page"
    !--
    link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" rel="external nofollow" 
    --
 
 /head
 
 body
  h1系统登录/h1
  hr
  form name="loginForm" action="dologin.jspmypass=999999" method="post"
   table
    tr
     td用户名：/td
     tdinput type="text" name="username" value=""//td
    /tr
    tr
     td密码：/td
     tdinput type="password" name="password" value=""//td
    /tr
    tr
     td colspan="2" align="center"input type="submit" value="登录"//td
     
    /tr
   /table
  /form
 /body
/html

2、dologin.jsp

%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%
%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%
 
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
html
 head
  base href="%=basePath%" rel="external nofollow" rel="external nofollow" 
  
  titleMy JSP 'dologin.jsp' starting page/title
  
    meta http-equiv="pragma" content="no-cache"
    meta http-equiv="cache-control" content="no-cache"
    meta http-equiv="expires" content="0"  
    meta http-equiv="keywords" content="keyword1,keyword2,keyword3"
    meta http-equiv="description" content="This is my page"
    !--
    link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" rel="external nofollow" 
    --
 
 /head
 
 body
  jsp:useBean id="myUsers" class="com.po.Users" scope="page"/
  h1setProperty动作元素/h1
  hr
  !--根据表单自动匹配所有的属性 --
  %--
  jsp:setProperty name="myUsers" property="*"/ 
  --%
  !--根据表单匹配所有部分的属性 --
  %--
  jsp:setProperty name="myUsers" property="username"/ 
  --%
  !--根表单无关，通过手工赋值给属性 --
  %--
  jsp:setProperty name="myUsers" property="username" value="lisi"/
  jsp:setProperty name="myUsers" property="password" value="888888"/
  --%
  !--通过URL传参数给属性赋值 --
  jsp:setProperty name="myUsers" property="username"/
  jsp:setProperty name="myUsers" property="password" param="mypass"/
  !-- 使用传统的表达式方式来获取用户名和密码 --
    用户名：%=myUsers.getUsername() %br
    密码：%=myUsers.getPassword() %br
  br
  br
 /body
/html

四 运行结果

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• JSP JavaBean的setProperty属性