http请求返回302处理方案

ゞ浴缸里的玫瑰 2022-07-14 02:52 286阅读 0赞

http发送淘宝客短链，请求返回302重定向，需要经过几次跳转后，最终得到请求返回内容。代码如下：

import java.net.HttpURLConnection;
    import java.net.URL;
    import java.net.URLDecoder;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    /** * 解决淘宝客短链302跳转 / 商品数字ID转换工具类 * (Tbk shortlink / num_iid convertor) */
    public class ShorturlNumiidConvertUtil { 
        public static void main(String[] args) {
            String shortLink = "http://s.click.taobao.com/Qpv0xTx";
    
            System.out.println("访问地址:" + shortLink);
            URL serverUrl = null;
            try {
                /** * 第一次跳转(短链 => 获取点击链接) */
                serverUrl = new URL(shortLink);
                HttpURLConnection conn1Jump = (HttpURLConnection) serverUrl
                        .openConnection();
                conn1Jump.setRequestMethod("GET");
    
                // 必须设置false，否则会自动redirect到Location的地址
                conn1Jump.setInstanceFollowRedirects(false);
                conn1Jump.connect();
                //response-header field,Location用于302重定向地址
                String location = conn1Jump.getHeaderField("Location");
    
                System.out.println("302第一次跳转地址:" + location);
    
                /** * 第二次跳转(点击链接 => 转换成js跳转链接) */
                serverUrl = new URL(location);
                HttpURLConnection conn2Jump = (HttpURLConnection) serverUrl
                        .openConnection();
                conn2Jump.setRequestMethod("GET");
    
                // 必须设置false，否则会自动redirect到Location的地址
                conn2Jump.setInstanceFollowRedirects(false);
                conn2Jump.connect();
                String locaTwo = conn2Jump.getHeaderField("Location");
    
                System.out.println("302第2次跳转地址:" + locaTwo);
    
                /** * 第三次跳转(js跳转链接 => 商品详情页) */
                String urlAfterDecode = URLDecoder.decode(locaTwo, "UTF-8").split("tu=")[1];
                serverUrl = new URL(urlAfterDecode);
                HttpURLConnection conn3Jump = (HttpURLConnection) serverUrl
                        .openConnection();
                conn3Jump.setRequestMethod("GET");
                conn3Jump.addRequestProperty("Referer", locaTwo);
    
                // 必须设置false，否则会自动redirect到Location的地址
                conn3Jump.setInstanceFollowRedirects(false);
                conn3Jump.connect();
                String locaThree = conn3Jump.getHeaderField("Location");
    
                System.out.println("302第3次跳转地址:" + locaThree);
    
                conn3Jump.disconnect();
                conn2Jump.disconnect();
                conn1Jump.disconnect();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }