前台代码：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>广告页面</title>
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="this is my page">
<meta http-equiv="content-type" content="text/html; charset=utf-8">
</head>
<body>
广告内容，请猛戳这里。<br/>
<a href="/day09/demo4">点击此处下载</a>
</body>
</html>
后台代码：
package servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class RequestDemo4 extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setHeader("content-type", "text/html; charset=utf-8");
response.setCharacterEncoding("utf-8");
String referer = request.getHeader("referer");
System.out.println("referer == " + referer);
/*
* 判断非法链接：
* 1）直接访问的话referer=null
* 2）如果当前请求不是来自广告
*/
if(referer == null || referer.contains("/day09/adv.html")) {
response.getWriter().write("当前是非法链接，请回到首页。<a href=‘/day09/adv.html‘>首页</a>");
} else {
//正确的链接
response.getWriter().write("资源正在下载...");
}
}
}
只是添加了response.setCharacterEncoding("utf-8");并不能防止乱码，还需要设置消息头。response.setHeader("content-type", "text/html; charset=utf-8");
时间： 2024-08-26 13:05:46