Java ConnectException.printStackTrace方法代碼示例

import java.net.ConnectException; //導入方法依賴的package包/類
/**
 * @param requestUrl
 * @param requestMethod
 * @param outputStr
 * @return
 */
public static JSONObject httpsRequest(String requestUrl, String requestMethod, String outputStr) {
    JSONObject jsonObject = null;
    StringBuffer buffer = new StringBuffer();
    try {
        TrustManager[] tm = {new MyX509TrustManager()};
        SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
        sslContext.init(null, tm, new java.security.SecureRandom());
        SSLSocketFactory ssf = sslContext.getSocketFactory();
        URL url = new URL(requestUrl);
        HttpsURLConnection httpUrlConn = (HttpsURLConnection) url.openConnection();
        httpUrlConn.setSSLSocketFactory(ssf);
        httpUrlConn.setDoOutput(true);
        httpUrlConn.setDoInput(true);
        httpUrlConn.setUseCaches(false);
        httpUrlConn.setRequestMethod(requestMethod);
        if ("GET".equalsIgnoreCase(requestMethod))
            httpUrlConn.connect();
        if (null != outputStr) {
            OutputStream outputStream = httpUrlConn.getOutputStream();
            outputStream.write(outputStr.getBytes("UTF-8"));
            outputStream.close();
        }
        InputStream inputStream = httpUrlConn.getInputStream();
        InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
        BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
        String str = null;
        while ((str = bufferedReader.readLine()) != null) {
            buffer.append(str);
        }
        bufferedReader.close();
        inputStreamReader.close();
        inputStream.close();
        inputStream = null;
        httpUrlConn.disconnect();
        jsonObject = JSONObject.parseObject(buffer.toString());
    } catch (ConnectException ce) {
        ce.printStackTrace();
    } catch (Exception e) {
        e.printStackTrace();
    }
    return jsonObject;
}
 

import java.net.ConnectException; //導入方法依賴的package包/類
public static JSONObject httpsRequest(String requestUrl, String requestMethod, String outputStr) {
	JSONObject jsonObject = null;
	try {
		// 創建SSLContext對象，並使用我們指定的信任管理器初始化
		TrustManager[] tm = { new HttpsX509TrustManager() };
		SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
		sslContext.init(null, tm, new java.security.SecureRandom());
		// 從上述SSLContext對象中得到SSLSocketFactory對象
		SSLSocketFactory ssf = sslContext.getSocketFactory();
		URL url = new URL(requestUrl);
		HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
		conn.setSSLSocketFactory(ssf);
		conn.setDoOutput(true);
		conn.setDoInput(true);
		conn.setRequestProperty("Connection", "keep-alive");
		conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.154 Safari/537.36");
		conn.setUseCaches(false);
		conn.setRequestProperty("Content-Type", "application/json;;charset=UTF-8");
		// 設置請求方式（GET/POST）
		conn.setRequestMethod(requestMethod);
		// 當outputStr不為null時向輸出流寫數據
		if (null != outputStr) {
			OutputStream outputStream = conn.getOutputStream();
			// 注意編碼格式
			outputStream.write(outputStr.getBytes("UTF-8"));
			outputStream.close();
		}
		// 從輸入流讀取返回內容
		InputStream inputStream = conn.getInputStream();
		InputStreamReader inputStreamReader = new InputStreamReader(inputStream, "utf-8");
		BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
		String str = null;
		StringBuffer buffer = new StringBuffer();
		while ((str = bufferedReader.readLine()) != null) {
			buffer.append(str);
		}
		// 釋放資源
		bufferedReader.close();
		inputStreamReader.close();
		inputStream.close();
		inputStream = null;
		conn.disconnect();
		jsonObject = JSONObject.parseObject(buffer.toString());
	} catch (ConnectException ce) {
		ce.printStackTrace();
	} catch (Exception e) {
		e.printStackTrace();
	}
	return jsonObject;
}
 

import java.net.ConnectException; //導入方法依賴的package包/類
public static void main(String args[]) throws Exception {
    // find a free port
    ServerSocket ss = new ServerSocket(0);
    int port = ss.getLocalPort();
    ss.close();

    String address = String.valueOf(port);

    // launch the server debuggee
    Process process = launch(address, "Exit0");

    // attach to server debuggee and resume it so it can exit
    AttachingConnector conn = (AttachingConnector)findConnector("com.sun.jdi.SocketAttach");
    Map conn_args = conn.defaultArguments();
    Connector.IntegerArgument port_arg =
        (Connector.IntegerArgument)conn_args.get("port");
    port_arg.setValue(port);

    System.out.println("Connection arguments: " + conn_args);

    VirtualMachine vm = null;
    while (vm == null) {
        try {
            vm = conn.attach(conn_args);
        } catch (ConnectException e) {
            e.printStackTrace(System.out);
            System.out.println("--- Debugee not ready. Retrying in 500ms. ---");
            Thread.sleep(500);
        }
    }

    // The first event is always a VMStartEvent, and it is always in
    // an EventSet by itself.  Wait for it.
    EventSet evtSet = vm.eventQueue().remove();
    for (Event event: evtSet) {
        if (event instanceof VMStartEvent) {
            break;
        }
        throw new RuntimeException("Test failed - debuggee did not start properly");
    }
    vm.eventRequestManager().deleteAllBreakpoints();
    vm.resume();

    int exitCode = process.waitFor();

    // if the server debuggee ran cleanly, we assume we were clean
    if (exitCode == 0 && error_seen == 0) {
        System.out.println("Test passed - server debuggee cleanly terminated");
    } else {
        throw new RuntimeException("Test failed - server debuggee generated an error when it terminated, " +
            "exit code was " + exitCode + ", " + error_seen + " error(s) seen in debugee output.");
    }
}