在這個例子中，我們將看到如何使用java.net包實用工具，創(chuàng)建一個訪問REST服務(wù)RESTful的客戶端。當(dāng)然這不是創(chuàng)建一個RESTful客戶端最簡單的方法，因為你必須自己讀取服務(wù)器端的響應(yīng)，以及Json和Java對象的轉(zhuǎn)換。

請求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();

}

} }

運行后輸出結(jié)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();

}

}????? }

總結(jié)

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