HttpURLConnection

访问get资源

HttpURLConnection connection = (HttpURLConnection)new URL("http://ip/test").openConnection();int responseCode = connection.getResponseCode();InputStream inputStream;if (200 <= responseCode && responseCode <= 299) {    inputStream = connection.getInputStream();} else {    inputStream = connection.getErrorStream();}BufferedReader in = new BufferedReader( new InputStreamReader(inputStream));StringBuilder response = new StringBuilder();String currentLine;while ((currentLine = in.readLine()) != null) response.append(currentLine);in.close();response.toString();

访问post资源

HttpURLConnection connection = (HttpURLConnection)new URL("http://ip/test").openConnection();connection.setRequestProperty("Content-Type", "application/json");connection.setDoOutput(true);OutputStream out = connection.getOutputStream();out.write("post传递的数据".getBytes());out.close();InputStream in = connection.getInputStream();BufferedReader reader = new BufferedReader(new InputStreamReader(in));String line = null;while ((line = reader.readLine()) != null) {    System.out.println(line);}in.close();if (connection != null) connection.disconnect();if (out != null) out.close();if (in != null) in.close();

访问Delete资源

HttpURLConnection connection = (HttpURLConnection)new URL("http://ip/test").openConnection();connection.setRequestProperty("Content-Type", "application/json");connection.setRequestMethod("DELETE");connection.setDoInput(true);Map
    
     > map = connection.getHeaderFields();StringBuilder sb = new StringBuilder();Iterator
     
      
       >> iterator = map.entrySet().iterator();while(iterator.hasNext()) {    Map.Entry
       
        > entry = iterator.next();    sb.append(entry.getKey());    sb.append('=').append('"');    sb.append(entry.getValue());    sb.append('"');    if(iterator.hasNext()){        sb.append(',').append(' ');    }}System.out.println(sb.toString());if (connection != null) connection.disconnect();
       
      
     
    

获取状态码

HttpURLConnection connection = (HttpURLConnection)new URL("http://ip/test").openConnection();connection.setRequestMethod("HEAD");int code = connection.getResponseCode();connection.disconnect();

结语

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