63 javabean的作用域范围
定义一个users类
package srever;
public class Users {
private String username;
private String password;
public Users() {
}
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;
}
}
定义一个login的jsp页面
<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>用户登录</h1>
<hr>
<form action="dologind.jsp?mypass=999999" name="loginForm" method="post">
<table>
<tr>
<td>用户名:</td>
<td><input type="text" name="username"/></td>
</tr>
<tr>
<td>密码:</td>
<td><input type="password" name="password"/></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="登录"></td>
</tr>
</table>
</body>
</html>
改为session
运行结果
改为request
dologin
<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<jsp:useBean id="myUsers" class="srever.Users" scope="application"/>
<h1>setproperty</h1><br>
<!-- 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getproperty获取密码 -->
账号:<jsp:getProperty name="myUsers" property="username"/>
密码:<jsp:getProperty name="myUsers" property="password" />
<a href="testScope.jsp">测试作用域范围</a>
<%
request.getRequestDispatcher("tstScope.jsp").forward(request,response);
%>
</body>
</html>
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