java restful规范 restful java 例子

在这个例子中，我们将看到如何使用java.net包实用工具，创建一个访问REST服务RESTful的客户端。当然这不是创建一个RESTful客户端最简单的方法，因为你必须自己读取服务器端的响应，以及Json和Java对象的转换。

请求Get

public class JavaNetURLRESTFulClient {
        private static final String targetURL = "http://localhost:8080/JerseyJSONExample/rest/jsonServices/print/Jamie";
        public static void main(String[] args) {
                 try {
                      URL restServiceURL = new URL(targetURL);
                      HttpURLConnection httpConnection = (HttpURLConnection) restServiceURL.openConnection();
                      httpConnection.setRequestMethod("GET");
                      httpConnection.setRequestProperty("Accept", "application/json");                      if (httpConnection.getResponseCode() != 200) {
                             throw new RuntimeException("HTTP GET Request Failed with Error code : "
                                           + httpConnection.getResponseCode());
                      }                      BufferedReader responseBuffer = new BufferedReader(new InputStreamReader(
                             (httpConnection.getInputStream())));                      String output;
                      System.out.println("Output from Server:  \n");                      while ((output = responseBuffer.readLine()) != null) {
                             System.out.println(output);
                      }                      httpConnection.disconnect();
                 } catch (MalformedURLException e) {
                      e.printStackTrace();
                 } catch (IOException e) {
                      e.printStackTrace();
                 }
               }
 }

运行后输出结果是：

Output from Server: {"id":1,"firstName":"Jamie","age":22,"lastName":"Diaz"}

POST提交：

public class JavaNetURLRESTFulClient {
        private static final String targetURL = "http://localhost:8080/JerseyJSONExample/rest/jsonServices/send";
        public static void main(String[] args) {
               try {
                      URL targetUrl = new URL(targetURL);
                      HttpURLConnection httpConnection = (HttpURLConnection) targetUrl.openConnection();
                      httpConnection.setDoOutput(true);
                      httpConnection.setRequestMethod("POST");
                      httpConnection.setRequestProperty("Content-Type", "application/json");                      String input = "{\"id\":1,\"firstName\":\"Liam\",\"age\":22,\"lastName\":\"Marco\"}";
                      OutputStream outputStream = httpConnection.getOutputStream();
                      outputStream.write(input.getBytes());
                      outputStream.flush();                      if (httpConnection.getResponseCode() != 200) {
                             throw new RuntimeException("Failed : HTTP error code : "
                                    + httpConnection.getResponseCode());
                      }                      BufferedReader responseBuffer = new BufferedReader(new InputStreamReader(
                                    (httpConnection.getInputStream())));                      String output;
                      System.out.println("Output from Server:\n");
                      while ((output = responseBuffer.readLine()) != null) {
                             System.out.println(output);
                      }                      httpConnection.disconnect();
                 } catch (MalformedURLException e) {
                      e.printStackTrace();
                 } catch (IOException e) {
                      e.printStackTrace();
                }
               }     
 }