java HTTP请求URL 获取其跳转后地址及参数

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);

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();
        }
    }

}

转载: http://blog.csdn.net/yaerfeng/article/details/19031529