HttpURLConnection
访问 get 资源
访问 post 资源
访问 Delete 资源
获取状态码
结语
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<String, List<String>> map = connection.getHeaderFields();
- StringBuilder sb = new StringBuilder();
- Iterator<Map.Entry<String, List<String>>> iterator = map.entrySet().iterator();
- while(iterator.hasNext()) {
- Map.Entry<String, List<String>> 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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