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  • 如何在Java客户端调用RESTful服务

    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:  ");

                         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: ");
                         while ((output = responseBuffer.readLine()) != null) {
                                System.out.println(output);
                         }

                         httpConnection.disconnect();

                    } catch (MalformedURLException e) {

                         e.printStackTrace();

                    } catch (IOException e) {

                         e.printStackTrace();

                   }

                  }     
    }

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  • 原文地址:https://www.cnblogs.com/Rozdy/p/4630926.html
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