java HttpURLConnection來實作get及post動作

這個範例可以利用java.net.HttpURLconnection或HttpsURLconnection來摸擬瀏覽網頁

做form submit動作

public boolean doPost(String sURL,String data,String cookie,String referer,String charset)

post部份需要傳入

  • sURL:Action的url
  • data :要傳送的的資料也就是像id=123&test=456之類的
  • cookie:是否要傳送cookie資料,可為null,像 __utma=114386561.1334910113.1250671126.1251247266.1251279995.24;
  • referer:傳那裡來的,是一個網址,可為null
  • charset:傳送及取回的資料編碼為何
public boolean doGet(String sURL,String cookie,String referer,String charset)

跟post唯一不同的地方為

  • sURL:Action的url 再加上?data ,像http://www.aaa.com/123.jsp?id=123&test=456

ps.範例使用log4j,如果不會用的人可以直接把log4j部份改成System.out.println

private org.apache.log4j.Logger logger; 

  public WebModule() { 
    logger = org.apache.log4j.Logger.getLogger(this.getClass()); 
  } 

  public boolean doPost(String sURL, String data, String cookie, 
      String referer, String charset) { 

    boolean doSuccess = false; 
    java.io.BufferedWriter wr = null; 
    try { 

      URL url = new URL(sURL); 
      HttpURLConnection URLConn = (HttpURLConnection) url 
          .openConnection(); 

      URLConn.setDoOutput(true); 
      URLConn.setDoInput(true); 
      ((HttpURLConnection) URLConn).setRequestMethod("POST"); 
      URLConn.setUseCaches(false); 
      URLConn.setAllowUserInteraction(true); 
      HttpURLConnection.setFollowRedirects(true); 
      URLConn.setInstanceFollowRedirects(true); 

      URLConn 
          .setRequestProperty( 
              "User-agent", 
              "Mozilla/5.0 (Windows; U; Windows NT 6.0; zh-TW; rv:1.9.1.2) " 
                  + "Gecko/20090729 Firefox/3.5.2 GTB5 (.NET CLR 3.5.30729)"); 
      URLConn 
          .setRequestProperty("Accept", 
              "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"); 
      URLConn.setRequestProperty("Accept-Language", 
          "zh-tw,en-us;q=0.7,en;q=0.3"); 
      URLConn.setRequestProperty("Accept-Charse", 
          "Big5,utf-8;q=0.7,*;q=0.7"); 
      if (cookie != null) 
        URLConn.setRequestProperty("Cookie", cookie); 
      if (referer != null) 
        URLConn.setRequestProperty("Referer", referer); 

      URLConn.setRequestProperty("Content-Type", 
          "application/x-www-form-urlencoded"); 
      URLConn.setRequestProperty("Content-Length", String.valueOf(data 
          .getBytes().length)); 

      java.io.DataOutputStream dos = new java.io.DataOutputStream(URLConn 
          .getOutputStream()); 
      dos.writeBytes(data); 

      java.io.BufferedReader rd = new java.io.BufferedReader( 
          new java.io.InputStreamReader(URLConn.getInputStream(), 
              charset)); 
      String line; 
      while ((line = rd.readLine()) != null) { 
        System.out.println(line); 
      } 

      rd.close(); 
    } catch (java.io.IOException e) { 
      doSuccess = false; 
      logger.info(e); 

    } finally { 
      if (wr != null) { 
        try { 
          wr.close(); 
        } catch (java.io.IOException ex) { 
          logger.info(ex); 
        } 
        wr = null; 
      } 
    } 

    return doSuccess; 
  } 

  public boolean doGet(String sURL, String cookie, String referer, 
      String charset) { 
    boolean doSuccess = false; 
    BufferedReader in = null; 
    try { 
      URL url = new URL(sURL); 
      HttpURLConnection URLConn = (HttpURLConnection) url 
          .openConnection(); 
      URLConn 
          .setRequestProperty( 
              "User-agent", 
              "Mozilla/5.0 (Windows; U; Windows NT 6.0; zh-TW; rv:1.9.1.2) " 
                  + "Gecko/20090729 Firefox/3.5.2 GTB5 (.NET CLR 3.5.30729)"); 
      URLConn 
          .setRequestProperty("Accept", 
              "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"); 
      URLConn.setRequestProperty("Accept-Language", 
          "zh-tw,en-us;q=0.7,en;q=0.3"); 
      URLConn.setRequestProperty("Accept-Charse", 
          "Big5,utf-8;q=0.7,*;q=0.7"); 

      if (cookie != null) 
        URLConn.setRequestProperty("Cookie", cookie); 
      if (referer != null) 
        URLConn.setRequestProperty("Referer", referer); 
      URLConn.setDoInput(true); 
      URLConn.setDoOutput(true); 
      URLConn.connect(); 
      URLConn.getOutputStream().flush(); 
      in = new BufferedReader(new InputStreamReader(URLConn 
          .getInputStream(), charset)); 

      String line; 
      while ((line = in.readLine()) != null) { 
        System.out.println(line); 
      } 

    } catch (IOException e) { 
      doSuccess = false; 
      log.out.println(e); 
      e.printStackTrace(); 
    } finally { 
      if (in != null) { 
        try { 
          in.close(); 
        } catch (java.io.IOException ex) { 
          logger.info(ex); 
        } 
        in = null; 

      } 
    } 

    return doSuccess; 
  }

如果要使用SSL來取得資料可以用下面的source

public boolean doPostSSL(String sURL, String data, String referer, String charset) {
		buff = null;
		buff = new StringBuffer();
		boolean doSuccess = true;
		java.io.BufferedWriter wr = null;
		try {

			URL url = new URL(sURL);
			// Proxy proxy = new Proxy(Proxy.Type.HTTP, new
			// InetSocketAddress("proxy.hinet.net", 80));
			// trustAllHosts();
			HttpsURLConnection URLConn = (HttpsURLConnection) url.openConnection();

			URLConn.setDoOutput(true);
			URLConn.setDoInput(true);
			URLConn.setRequestMethod("POST");
			URLConn.setUseCaches(false);
			// URLConn.setHostnameVerifier(DO_NOT_VERYFY);
			URLConn.setAllowUserInteraction(true);
			HttpsURLConnection.setFollowRedirects(true);
			// URLConn.setInstanceFollowRedirects(true);
			URLConn.setInstanceFollowRedirects(false);

			URLConn.setRequestProperty("User-agent",
					"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.87 Safari/537.36");
			URLConn.setRequestProperty("Accept",
					"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8");
			URLConn.setRequestProperty("Accept-Encoding", "gzip,deflate,sdch");
			URLConn.setRequestProperty("Accept-Language", "zh-TW,zh;q=0.8,en-US;q=0.6,en;q=0.4");
			// URLConn.setRequestProperty("Accept-Charse",
			// "Big5,utf-8;q=0.7,*;q=0.7");
			if (sessionid != null)
				URLConn.setRequestProperty("Cookie", sessionid);
			if (referer != null)
				URLConn.setRequestProperty("Referer", referer);

			URLConn.setReadTimeout(30000);

			URLConn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
			URLConn.setRequestProperty("Content-Length", String.valueOf(data.getBytes().length));

			java.io.DataOutputStream dos = new java.io.DataOutputStream(URLConn.getOutputStream());
			dos.writeBytes(data);

			InputStream ins = null;
			// System.out.println("111111111111111\r\n"+URLConn.getContentEncoding()+"\r\n------------------------");
			if (URLConn.getContentEncoding() != null && !URLConn.getContentEncoding().equals("")) {
				String encode = URLConn.getContentEncoding().toLowerCase();
				if (encode != null && !encode.equals("") && encode.indexOf("gzip") >= 0) {
					ins = new GZIPInputStream(URLConn.getInputStream());
				}
			}
			if (ins == null)
				ins = URLConn.getInputStream();

			java.io.BufferedReader rd = new java.io.BufferedReader(new java.io.InputStreamReader(ins, charset));
			String line;
			while ((line = rd.readLine()) != null) {
				buff.append(line + "\r\n");
			}
			if (sessionid == null) {
				String key;
				if (URLConn != null) {
					for (int i = 1; (key = URLConn.getHeaderFieldKey(i)) != null; i++) {
						if (key.equalsIgnoreCase("set-cookie")) {
							sessionid = URLConn.getHeaderField(key);
							sessionid = sessionid.substring(0, sessionid.indexOf(";"));
						}
					}
				}
			}
			// System.out.println("------------------------------------"+sessionid);
			rd.close();
		} catch (java.io.IOException e) {
			doSuccess = false;
			logger.info(e);

		} finally {
			if (wr != null) {
				try {
					wr.close();
				} catch (java.io.IOException ex) {
					logger.info(ex);
					ex.printStackTrace();
				}
				wr = null;
			}
		}

		return doSuccess;
	}

	static {
		// Create a trust manager that does not validate certificate chains
		TrustManager[] trustAllCerts = new TrustManager[] { new X509TrustManager() {
			public java.security.cert.X509Certificate[] getAcceptedIssuers() {
				return new java.security.cert.X509Certificate[] {};
			}

			public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
			}

			public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
			}
		} };

		// Install the all-trusting trust manager
		try {
			SSLContext sc = SSLContext.getInstance("TLS");
			sc.init(null, trustAllCerts, new java.security.SecureRandom());
			HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

如果要取得error code 像是405 ,505之後的訊息或內容可以使用下面的source

在getInputStream時如果有error時會跑到IOException,此時取得Error Stream來做處理

	    		  InputStream error = URLConn.getErrorStream();
	    		  String line = "";
	              try {
	            	  
	              
	                  int data = error.read();
	                  while (data != -1) {
	                      
	                      line = line + (char)data;
	                      data = error.read();
	                      
	                  }
	                  
	                  error.close();
	              } catch (Exception ex) {
	                  try {
	                      if (error != null) {
	                          error.close();
	                      }
	                  } catch (Exception exx) {

	                  }
	              }

13 thoughts to “java HttpURLConnection來實作get及post動作”

  1. 這篇文章太棒啦,讓我不必用到「HttpClient」就能讓網頁執行post動作,真是獲益良多,謝謝作者的教學。
    還有其他文章的教學都很讚和很有幫助,有看有推,雖然懶的一篇一篇回,只有留這篇留言 意思意思,但總之每篇文章都大推,謝謝作者大方地傾囊相授啦~

    1. 謝謝你的讚美…
      如果有什麼特別需求也可以跟我講…
      我有時間會做的範例的^^ (能力之內)

  2. hihi yku
    看完你的文章 存在很多疑問
    要將android與PC做連接 1個圖檔用網路的方式上傳到PC
    這地方我一直想不透要怎麼做
    能否請你指教…
    By初學的Please

    1. 一個圖檔可以利用httpurlconnection的post stream上傳至Server
      就如你上一篇問的一樣,也可以提供一個網站讓android使用者自己選取檔案上傳

  3. hihi
    能否請教 將一個圖片透過網路上傳到電腦且讓圖片回傳到android
    這點要從哪裡動工 請指教
    多謝~

    1. 上傳的方式上一篇有回覆,那回傳到android部份 你就利用HttpUrlConnection把要接收的圖檔利用到getInputStream的串流把它存成檔案

  4. 請問大大

    我照著http://www.myandroid.tw/bbs-topic-21.sea
    的教學作

    他都無法跟網頁溝通

    請問是我哪裡沒弄到?

    我有設定權限

    1. 你可以試著用它的程式 去抓tw.yahoo.com的內容回來嘛?
      如果可以,那就是你server的設定配合有問題
      1.是不是port不對
      2.連接ip是否在同一個區段,或Server是否可對外
      3……
      如果不能取回內容,那程式碼就有狀況了!
      你給的資訊不對,我也只能這樣子猜而已

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