如何通过HttpURLConnection得到http 302的跳转地址

如何通过HttpURLConnection得到http 302的跳转地址

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J2SE 2014-02-10 10:44
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redirect302HttpURLConnection跳转
如果不想直接跳转到目标地址，想对中间的Location做些处理则可以通过HttpURLConnection实现。 // 必须设置false，否则会自动redirect到Location的地址 conn.setInstanceFollowRedirects(false);

[java]
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package com.zuidaima;

import java.net.HttpURLConnection;
import java.net.URL;

/**
* 如何通过HttpURLConnection得到http 302的跳转地址
*
* @author javaniu
*
*/
public class Http302 {

public static void main(String[] args) {
try {
String url = "http://www.zuidaima.com/302.htm";
System.out.println("访问地址:" + url);
URL serverUrl = new URL(url);
HttpURLConnection conn = (HttpURLConnection) serverUrl
.openConnection();
conn.setRequestMethod("GET");
// 必须设置false，否则会自动redirect到Location的地址
conn.setInstanceFollowRedirects(false);

conn.addRequestProperty("Accept-Charset", "UTF-8;");
conn.addRequestProperty("User-Agent",
"Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.8) Firefox/3.6.8");
conn.addRequestProperty("Referer", "http://zuidaima.com/");
conn.connect();
String location = conn.getHeaderField("Location");

serverUrl = new URL(location);
conn = (HttpURLConnection) serverUrl.openConnection();
conn.setRequestMethod("GET");

conn.addRequestProperty("Accept-Charset", "UTF-8;");
conn.addRequestProperty("User-Agent",
"Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.8) Firefox/3.6.8");
conn.addRequestProperty("Referer", "http://zuidaima.com/");
conn.connect();
System.out.println("跳转地址:" + location);

} catch (Exception e) {
e.printStackTrace();
}
}

}