防盗链代码实现

[java]代码库

package pm_cn.itcast.request;

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 RequestDemo3 extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		// 会带过来  : referer: http://localhost:8080/day11/1.html
		
		String headerValue = request.getHeader("referer");
		
		response.setContentType("text/html;charset=utf-8");
		if(headerValue==null|| !headerValue.startsWith("http://localhost:8080")){
			
			// 说明是 盗链 过来的 . 
			response.getWriter().print("哥们,  你是 盗链 过来的 ...");
		}else{
//			http://localhost:8080
			// 说明 不是 盗链 过来的 
			response.getWriter().print(" 采访 詹姆斯 ");
		}
	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request, response);
	}

}