1 <%@page import="java.net.URI"%> 2 <%@page import="java.io.IOException"%> 3 <%@page import="org.apache.http.HttpHost"%> 4 <%@page import="org.apache.http.HttpResponse"%> 5 <%@page import="org.apache.http.HttpStatus"%> 6 <%@page import="org.apache.http.client.ClientProtocolException"%> 7 <%@page import="org.apache.http.client.methods.HttpGet"%> 8 <%@page import="org.apache.http.client.methods.HttpUriRequest"%> 9 <%@page import="org.apache.http.impl.client.DefaultHttpClient"%> 10 <%@page import="org.apache.http.protocol.BasicHttpContext"%> 11 <%@page import="org.apache.http.protocol.ExecutionContext"%> 12 <%@page import="org.apache.http.protocol.HttpContext"%> 13 <%@page import="org.apache.http.client.utils.URLEncodedUtils"%> 14 <%@page import="java.net.URLEncoder"%> 15 <%@page import="java.io.UnsupportedEncodingException"%> 16 <%@page import="org.apache.http.impl.client.DefaultRedirectHandler"%> 17 <%@page import="org.apache.http.ProtocolException"%> 18 <%@page import="org.apache.http.Header"%> 19 <%@page import="java.net.URISyntaxException"%> 20 <%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %> 21 <%@ taglib uri="http://www.duxiu.com/proxy" prefix="proxy" %> 22 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 23 <%! 24 class CustomRedirectHandler extends DefaultRedirectHandler { 25 @Override 26 public URI getLocationURI(HttpResponse response, HttpContext context) throws ProtocolException{ 27 if(isRedirectRequested( response, context)) 28 { 29 Header locationHeader = response.getFirstHeader("location"); 30 String location= locationHeader.getValue(); 31 if(location!=null&&!"".equals(location)&&!location.startsWith("http")&&location.contains("---")){ 32 response.removeHeaders("location"); 33 response.setHeader("location","-----"+location); 34 URI uri=null; 35 try { 36 uri = new URI("------"+location.substring(0, location.lastIndexOf("url=") + 4) 37 + URLEncoder.encode(location.substring(location.indexOf("url=") + 4, location.length()))); 38 } catch (URISyntaxException e) { 39 e.printStackTrace(); 40 } 41 return uri; 42 } 43 } 44 return super.getLocationURI(response,context); 45 46 } 47 } 48 %> 49 <%!public String test1(String url) { 50 DefaultHttpClient httpClient = new DefaultHttpClient(); 51 CustomRedirectHandler handler=new CustomRedirectHandler(); 52 httpClient.setRedirectHandler(handler); 53 HttpGet httpget = new HttpGet(url); 54 HttpContext context = new BasicHttpContext(); 55 HttpResponse response = null; 56 try { 57 response = httpClient.execute(httpget, context); 58 } catch (ClientProtocolException e1) { 59 e1.printStackTrace(); 60 } catch (IOException e1) { 61 e1.printStackTrace(); 62 } 63 if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) 64 try { 65 throw new IOException(response.getStatusLine().toString()); 66 } catch (IOException e) { 67 e.printStackTrace(); 68 } 69 HttpUriRequest currentReq = (HttpUriRequest) context.getAttribute(ExecutionContext.HTTP_REQUEST); 70 HttpHost currentHost = (HttpHost) context.getAttribute(ExecutionContext.HTTP_TARGET_HOST); 71 String currentUrl = (currentReq.getURI().isAbsolute()) ? currentReq.getURI().toString(): (currentHost.toURI() + currentReq.getURI()); 72 return currentUrl; 73 } %> 74 <% 75 String dx = request.getParameter("dx"); 76 if(dx==null||"".equals(dx)) 77 { 78 out.println("dx为空!"); 79 return; 80 } 81 // 获得最终访问地址 82 String url =dx; 83 out.println("url="+url); 84 String finalURL=test1(url); 85 //out.println("finalURL="+finalURL); 86 if(!url.equals(finalURL)){ 87 response.sendRedirect("最终跳转地址"); 88 } 89 %>
继承DefaultRedirectHandler，重写获得URI方法-----