創(chuàng)建基于HttpUrlConnection的具體獲取網絡數(shù)據(jù)流HttpUrlConnectionUtil
public class HttpUrlConnectionUtil {
public static ByteArrayOutputStream execute(Request request) throws HttpException {
switch (request.requestMethod) {
case GET:
return get(request);
case POST:
return post(request);
}
return null;
}
private static ByteArrayOutputStream get(Request request) throws HttpException {
try {
HttpURLConnection connection = (HttpURLConnection) new URL(request.url).openConnection();
connection.setRequestMethod("GET");
connection.setConnectTimeout(15 * 1000);
addHeaders(connection, request);
if (HttpStatus.HTTP_OK == connection.getResponseCode()) {
InputStream is = connection.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[2048];
int len = 0;
while (-1 != (len = is.read(buffer))) {
baos.write(buffer, 0, len);
}
baos.flush();
baos.close();
is.close();
return baos;
}
} catch (MalformedURLException e) {
throw new HttpException(HttpException.Status.XXX_EXCEPTION);
} catch (ProtocolException e) {
throw new HttpException(HttpException.Status.XXX_EXCEPTION);
} catch (SocketTimeoutException e) {
throw new HttpException(HttpException.Status.TIMEOUT_EXCEPTION);
} catch (IOException e) {
throw new HttpException(HttpException.Status.XXX_EXCEPTION);
}
throw new HttpException(HttpException.Status.XXX_EXCEPTION);
}
private static ByteArrayOutputStream post(Request request) throws HttpException {
try {
HttpURLConnection connection = (HttpURLConnection) new URL(request.url).openConnection();
connection.setRequestMethod("POST");
connection.setConnectTimeout(15 * 1000);
connection.setDoOutput(true);
connection.setDoInput(true);
addHeaders(connection, request);
StringBuilder out = new StringBuilder();
for (String key : request.body.keySet()) {
if (out.length() != 0) {
out.append("&");
}
out.append(key).append("=").append(request.body.get(key));
}
OutputStream outputStream = connection.getOutputStream();
outputStream.write(out.toString().getBytes());
if (HttpStatus.HTTP_OK == connection.getResponseCode()) {
InputStream is = connection.getInputStream();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
byte[] buffer = new byte[2048];
int len = 0;
while (-1 != (len = is.read(buffer))) {
baos.write(buffer, 0, len);
}
baos.flush();
baos.close();
is.close();
return baos;
}
} catch (MalformedURLException e) {
throw new HttpException(HttpException.Status.XXX_EXCEPTION);
} catch (ProtocolException e) {
throw new HttpException(HttpException.Status.XXX_EXCEPTION);
} catch (SocketTimeoutException e) {
throw new HttpException(HttpException.Status.TIMEOUT_EXCEPTION);
} catch (IOException e) {
throw new HttpException(HttpException.Status.XXX_EXCEPTION);
}
throw new HttpException(HttpException.Status.XXX_EXCEPTION);
}
private static void addHeaders(HttpURLConnection connection, Request request) {
for (Map.Entry<String, String> header : request.headers.entrySet()) {
connection.addRequestProperty(header.getKey(), header.getValue());
}
}
}
包裝具體每一個請求的Request類
public class Request {
/**
* 請求地址
*/
public String url;
/**
* 請求form表單
*/
public Map<String, String> body;
/**
* 請求頭
*/
public Map<String, String> headers = new HashMap<>();
/**
* 請求方法
*/
public RequestMethod requestMethod;
/**
* 請求回調
*/
public AbsCallback callBack;
/**
* 請求重試次數(shù)
*/
public int maxRequestCount = 3;
public enum RequestMethod {GET, POST}
public Request(String url, RequestMethod requestMethod) {
this.url = url;
this.requestMethod = requestMethod;
}
public Request setUrl(String url) {
this.url = url;
return this;
}
public Request setBody(Map<String, String> body) {
this.body = body;
return this;
}
public void setCallBack(AbsCallback callBack) {
this.callBack = callBack;
}
}
基于Handler旋圆、ThreadPoolExecutor線程池的異步請求處理類
public class RequestTask {
private static final int MAIN_THREAD = 0x0001;
private static InnerHandler handler = new InnerHandler();
private final ThreadPoolExecutor poolExecutor = new ThreadPoolExecutor(5,
Integer.MAX_VALUE,
60 * 1000,
TimeUnit.MILLISECONDS,
new LinkedBlockingDeque<Runnable>(128));
private Request request;
public RequestTask(Request request) {
this.request = request;
}
public void execute() {
poolExecutor.execute(new Runnable() {
@Override
public void run() {
Result result = request(0);
Message message = handler.obtainMessage();
message.obj = result;
message.what = MAIN_THREAD;
handler.sendMessage(message);
}
});
}
private Result request(int retry) {
try {
final ByteArrayOutputStream response = HttpUrlConnectionUtil.execute(request);
return new Result(RequestTask.this, request.callBack.handleData(response));
} catch (HttpException e) {
if (e.type == HttpException.Status.TIMEOUT_EXCEPTION) {
if (retry < request.maxRequestCount) {
retry++;
request(retry);
}
}
return new Result(RequestTask.this, e);
}
}
private static class InnerHandler extends Handler {
private InnerHandler() {
super(Looper.getMainLooper());
}
@Override
public void handleMessage(Message msg) {
Result result = (Result) msg.obj;
switch (msg.what) {
case MAIN_THREAD:
if (result.response instanceof Exception) {
result.requestTask.request.callBack.failure((Exception) result.response);
return;
}
result.requestTask.request.callBack.sucess(result.response);
}
}
}
private static class Result<T> {
private RequestTask requestTask;
private T response;
private Result(RequestTask requestTask, T response) {
this.requestTask = requestTask;
this.response = response;
}
}
}
可拓展的響應處理callback,自己可根據(jù)需要拓展
public interface AbsCallback<T> {
void sucess(T response);
void failure(Exception e);
T handleData(ByteArrayOutputStream response) throws HttpException;
}
public abstract class JsonCallback<T> implements AbsCallback<T> {
private static Gson gson = new Gson();
@Override
@SuppressWarnings("unchecked")
public T handleData(ByteArrayOutputStream response) throws HttpException {
try {
Class<T> clz= (Class<T>) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
return gson.fromJson(response.toString("UTF-8"),clz);
} catch (UnsupportedEncodingException e) {
throw new HttpException(HttpException.Status.XXX_EXCEPTION);
}
}
}
public abstract class StringCallback implements AbsCallback<String> {
@Override
public String handleData(ByteArrayOutputStream response) throws HttpException {
try {
return response.toString("UTF-8");
} catch (UnsupportedEncodingException e) {
throw new HttpException(HttpException.Status.XXX_EXCEPTION);
}
}
}
有問題猾愿，請留言交流
