我有使用 Jersey 在 java (JAX-RS) 中实现 REST 的个人经验。然后我通过一个 Android 应用程序连接到这个 RESTful Web 服务。
在您的 Android 应用程序中,您可以使用 HTTP 客户端库。它支持 POST、PUT、DELETE、GET 等 HTTP 命令。例如使用 GET 命令并以 JSON 格式或 TextPlain 传输数据:
public class Client {
private String server;
public Client(String server) {
this.server = server;
}
private String getBase() {
return server;
}
public String getBaseURI(String str) {
String result = "";
try {
HttpParams httpParameters = new BasicHttpParams();
int timeoutConnection = 3000;
HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
int timeoutSocket = 5000;
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters);
HttpGet getRequest = new HttpGet(getBase() + str);
getRequest.addHeader("accept", "application/json");
HttpResponse response = httpClient.execute(getRequest);
result = getResult(response).toString();
httpClient.getConnectionManager().shutdown();
} catch (Exception e) {
System.out.println(e.getMessage());
}
return result;
}
public String getBaseURIText(String str) {
String result = "";
try {
HttpParams httpParameters = new BasicHttpParams();
int timeoutConnection = 3000;
HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
int timeoutSocket = 5000;
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters);
HttpGet getRequest = new HttpGet(getBase() + str);
getRequest.addHeader("accept", "text/plain");
HttpResponse response = httpClient.execute(getRequest);
result = getResult(response).toString();
httpClient.getConnectionManager().shutdown();
} catch (Exception e) {
System.out.println(e.getMessage());
}
return result;
}
private StringBuilder getResult(HttpResponse response) throws IllegalStateException, IOException {
StringBuilder result = new StringBuilder();
BufferedReader br = new BufferedReader(new InputStreamReader((response.getEntity().getContent())), 1024);
String output;
while ((output = br.readLine()) != null)
result.append(output);
return result;
}
}
然后在一个 android 类中你可以:
Client client = new Client("http://localhost:6577/Example/rest/");
String str = client.getBaseURI("Example"); // Json format
解析 JSON 字符串(或者可能是 xml)并在 ListView、GridView 和...中使用它
我简要浏览了您提供的链接。那里有一个好点。您需要在 API 级别 11 或更高级别的单独线程上实现网络连接。看看这个链接:HTTP Client API level 11 or higher in Android。
这是我在 Client 类中使用 HTTP 发布对象的方式:
public String postBaseURI(String str, String strUrl) {
String result = "";
try {
HttpParams httpParameters = new BasicHttpParams();
int timeoutConnection = 3000;
HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
int timeoutSocket = 5000;
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
DefaultHttpClient httpClient = new DefaultHttpClient(httpParameters);
HttpPost postRequest = new HttpPost(getBase() + strUrl);
StringEntity input = new StringEntity(str);
input.setContentType("application/json");
postRequest.setEntity(input);
HttpResponse response = httpClient.execute(postRequest);
result = getResult(response).toString();
httpClient.getConnectionManager().shutdown();
} catch (Exception e) {
System.out.println(e.getMessage());
}
return result;
}
在 REST WS 中,我将对象发布到数据库:
@POST
@Path("/post")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.TEXT_PLAIN)
public Response addTask(Task task) {
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
session.save(task);
session.getTransaction().commit();
return Response.status(Response.Status.CREATED).build();
}