script心得，哈哈。。。

来源：互联网发布：mac安装windows10出错编辑：程序博客网时间：2024/04/27 16:48

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%><%@page import = "loss.*" %><%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%>"> <link rel="stylesheet" type="text/css" href="./lib/ext-3.3.1/resources/css/ext-all.css" mce_href="lib/ext-3.3.1/resources/css/ext-all.css" /> <mce:script type="text/javascript" src="lib/ext-3.3.1/adapter/ext/ext-base.js" mce_src="lib/ext-3.3.1/adapter/ext/ext-base.js"></mce:script> <mce:script type="text/javascript" src="lib/ext-3.3.1/ext-all-debug.js" mce_src="lib/ext-3.3.1/ext-all-debug.js"></mce:script> <title>修改密码</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"><%!String Password = "222123";String Log_Username = "091110301";//E:/workspace/card/src/loss/modify.java ? method = Modify <form name = "form1" ID = "form1" action = "modifyPassword.jsp" method = "post" name = "listen1" >//src/loss/modify.java%><% boolean result = false; modify.setLog_Username(Log_Username); String pass = request.getParameter("password_new_Sure"); if(null != pass) { modify.setPassword(pass); System.out.println(pass + " 新密码"); result = modify.Modify(); } if(result == true){ // response.getWriter().print("<javascript type='text/javascript'>alert('密码');</javascript>"); out.print("<mce:script type='text/javascript'></mce:script>"); } else if ( result == false && (null != pass) ){ out.print("<mce:script type='text/javascript'></mce:script>"); // response.getWriter().print("<javascript type='text/javascript'>alert('密码');</javascript>"); } %> </head> <body BACKGROUND = "image/wenli.jpg"> <form name = "form1" ID = "form1" action = "modifyPassword.jsp" method = "post" name = "listen1" > 选择账号： <select id = "ID" name = "ID"> <option value = "0"><%=Log_Username%></option> </select> <br></br> <mce:script language="javascript"></mce:script> 原密码： <input type= "password" name = "password" onblur= "Check();" name = "listen"/><br></br> <mce:script language = "javascript"></mce:script> 新密码： <input type = "password" name = "password_new" onblur = "Check_new_bits();"><br></br> <mce:scriptlanguage="javascript"></mce:script> 新查询密<br></br> 码确认： <input type = "password" name = "password_new_Sure" onblur = "CheckTOO();"><br></br> <mce:scriptlanguage="javascript"></mce:script> <button type = "submit" name = "submit" >确定</button></form></body></html>

已上是课设的modifyPassword.jsp页面；以上是可执行的简单密码更改的操作；

有以下几点收获：

1.在jsp的java代码块是在页面加载时就已经执行的；对于那些镶嵌在script标签里的function函数，也一样，未触发事件也会在页面加载时执行一次；当在html或script里的各个时间调用时，也会执行；

2.对于response和request的操作，必须是页面提交后草可以使用；jsp页面调用其他的jsp页面，则用responde.getparameter("name");name是属性名；

3.对于自己页面的java代码块掉用自己页面的各种标签所对应的值，则是整个页面提交之后，才可获取；

比如说如下代码：

里面的

String pass = request.getParameter("password_new_Sure");

password_new_Sure是form里的密码矿的name属性；

点击button是先触发事件end();但是事件表单password_new_Sure得值不能获取；该值必须是在submit执行提交之后才执行；

所以导致我出现alert框弹出"密码更新失败"；但是数据库里的密码还是更新成功了；

该操作就是因为调用end();函数时respond没有执行；而是在submit之后执行的；