android 获取网络重定向URL

直接上代码:

import java.net.HttpURLConnection;
import java.net.URL;
import org.junit.Assert;
import org.junit.Test;
public class GetRedirectUrlTest {
    
    
    @Test
    public void test_getRedirectUrl() throws Exception {
    
    
        String url="http://www.baidu.com/link?url=ByBJLpHsj5nXx6DESXbmMjIrU5W4Eh0yg5wCQpe3kCQMlJK_RJBmdEYGm0DDTCoTDGaz7rH80gxjvtvoqJuYxK";
        String expectUrl="http://www.zhihu.com/question/20583607/answer/16597802";
        String redictURL = getRedirectUrl(url);
        Assert.assertEquals(expectUrl, redictURL);
    }
    /**
     * 获取重定向地址
     * @param path
     * @return
     * @throws Exception
     */
    private String getRedirectUrl(String path) throws Exception {
    
    
        HttpURLConnection conn = (HttpURLConnection) new URL(path)
                .openConnection();
        conn.setInstanceFollowRedirects(false);
        conn.setConnectTimeout(5000);
        return conn.getHeaderField("Location");
    }
}