HttpURLConnection

訪問get資源

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();

訪問post資源

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傳遞的數據".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();

訪問Delete資源

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();

獲取狀態碼

HttpURLConnection connection = (HttpURLConnection)new URL("http://ip/test").openConnection();

connection.setRequestMethod("HEAD");

int code = connection.getResponseCode();

connection.disconnect();

結語

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總結

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