# 獲取URL請求狀態 本篇簡單介紹如果使用原生API發送HTTP請求 題目: 請求鏈接 https://www.baidu.com/ ，查看返回URL的狀態 把這一部分單獨拿出來，是我覺得有必要更深一步的理解http狀態碼的作用 ### 原生API請求獲取HTTP返回狀態 ``` package com.llg.book.http; import java.net.HttpURLConnection; import java.net.MalformedURLException; import java.net.URL; import java.net.URLConnection; public class HttpResponseTest { public static void main(String[] args) throws MalformedURLException { String link = "https://www.baidu.com/"; URL url = new URL(link); System.out.println(getHttpResponseCode(url)); } public static int getHttpResponseCode(URL url) { HttpURLConnection httpurlconnection = null; int responsecode = -1; try { URLConnection urlconnection = url.openConnection(); urlconnection.connect(); if (!(urlconnection instanceof HttpURLConnection)) { // urlconnection.disconnect(); return responsecode; } httpurlconnection = (HttpURLConnection) urlconnection; // httpurlconnection.setFollowRedirects(true); // 獲取返回碼,通過responsecode 就可以知道網頁的狀態,我們也是通過此字段用于判斷請求的資源是否存在 responsecode= httpurlconnection.getResponseCode(); switch (responsecode) { // here valid codes! case HttpURLConnection.HTTP_OK: case HttpURLConnection.HTTP_MOVED_PERM: case HttpURLConnection.HTTP_MOVED_TEMP: break; default: httpurlconnection.disconnect(); } } catch (Exception ioexception) { if (httpurlconnection != null) { httpurlconnection.disconnect(); } return responsecode; } return responsecode; } } ``` 執行以上代碼，返回結果 ```200 ```