我个人有在Java(JAX-RS)中实现REST并使用Jersey的经验。然后我通过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 Client库。它支持HTTP命令,例如POST、PUT、DELETE、GET。例如,要使用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 Android 类中,您可以:
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等控件中使用它。
我简单地浏览了一下你提供的链接。那里有一个很好的观点。对于API级别11或更高版本,您需要将网络连接实现在一个单独的线程上。请查看此链接:Android中的HTTP客户端API级别11或更高版本。
这是我在客户端类中使用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 Web服务中,我将对象提交到数据库:
@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();
}