利用Android自带的http包进行网络请求

目的是为了不依赖第三方的jar包进行网络请求（如：commons-httpclient.jar）

修改了一下，可以自定义请求的Header，增加了对POST表单数据的支持。

1. 建立一个连接配置类

class UserAgentConfig {public String host;public String scheme = "http";public int port = 80;public int timeoutConnection = 3000;public int timeoutSocket = 20000;public String username = "";public String password = "";}

2. 封装请求类

public class HttpRequest {private String mUrl;private UserAgentConfig mConfig = null;private HashMap<String, String> mHeaders = null;private HttpEntity mBody = null;private int mStatus = -1;public HttpRequest(String url) {mUrl = url;}public void addHeader(String key, String value) {if (mHeaders == null)mHeaders = new HashMap<String, String>();mHeaders.put(key, value);}public void clearHeader() {mHeaders.clear();mHeaders = null;}public void setConfig(UserAgentConfig config) {mConfig = config;}public void setPostBody(List<BasicNameValuePair> body) {try {mBody = new UrlEncodedFormEntity(body, "utf-8");} catch (UnsupportedEncodingException e) {e.printStackTrace();}}public void setPostBody(String body) {try {mBody = new StringEntity(body);} catch (UnsupportedEncodingException e) {e.printStackTrace();}}public void execute() throws ClientProtocolException, IOException {httprequest();}public int getStatusCode() {return mStatus;}/** * get "Stream" as response *  * @return response in stream * @throws IOException * @throws ClientProtocolException */public InputStream getStream() throws ClientProtocolException, IOException {HttpEntity entity = httprequest();InputStream ret = null;if (entity != null) {try {byte[] b = EntityUtils.toByteArray(entity);ret = new ByteArrayInputStream(b);} finally {release(entity);}}return ret;}/** * get "String" as response *  * @return response in string * @throws IOException * @throws ClientProtocolException */public String getString() throws ClientProtocolException, IOException {HttpEntity entity = httprequest();String ret = null;if (entity != null) {try {ret = EntityUtils.toString(entity);} finally {release(entity);}}return ret;}/** * release connection resource *  * @param entity */private static void release(HttpEntity entity) {try {entity.consumeContent();} catch (IOException e) {e.printStackTrace();}}/** * get "HttpEntity" as response *  * @return * @throws IOException * @throws ClientProtocolException */private HttpEntity httprequest() throws ClientProtocolException,IOException {System.out.println(mUrl);DefaultHttpClient client = null;HttpEntity entity = null;BasicHttpParams httpParameters = new BasicHttpParams();if (mConfig != null) {// set connection timeoutHttpConnectionParams.setConnectionTimeout(httpParameters,mConfig.timeoutConnection);}client = new DefaultHttpClient(httpParameters);DefaultHttpRequestRetryHandler retryHandler = new DefaultHttpRequestRetryHandler(3, true);client.setHttpRequestRetryHandler(retryHandler);// set username & password if availableif (mConfig != null&& !(isEmpty(mConfig.username) && isEmpty(mConfig.password))) {AuthScope as = new AuthScope(mConfig.host, mConfig.port);UsernamePasswordCredentials upc = new UsernamePasswordCredentials(mConfig.username, mConfig.password);client.getCredentialsProvider().setCredentials(as, upc);}// check get or post method by paramsHttpRequestBase method = null;if (mBody == null) {method = new HttpGet(mUrl);} else {method = new HttpPost(mUrl);((HttpPost) method).setEntity(mBody);}// set request headerif (mHeaders != null) {Iterator<?> iter = mHeaders.entrySet().iterator();while (iter.hasNext()) {Map.Entry<?, ?> entry = (Entry<?, ?>) iter.next();String key = (String) entry.getKey();String val = (String) entry.getValue();method.setHeader(key, val);}}// get responseHttpResponse response = null;if (mConfig == null || isEmpty(mConfig.host) || isEmpty(mConfig.scheme)) {// only URL is availableresponse = client.execute(method);} else {BasicHttpContext localContext = new BasicHttpContext();BasicScheme basicAuth = new BasicScheme();localContext.setAttribute("preemptive-auth", basicAuth);HttpHost targetHost = new HttpHost(mConfig.host, mConfig.port,mConfig.scheme);response = client.execute(targetHost, method, localContext);}mStatus = response.getStatusLine().getStatusCode();entity = response.getEntity();return entity;}/** * Check the string is valuable or not *  * @param s * @return true if s is null or s.length() == 0 false otherwise */private boolean isEmpty(String s) {return s == null || s.length() == 0;}}

3. 调用
GET请求

HttpRequest request = new HttpRequest("...");request.execute();

UserAgentConfig config = new UserAgentConfig();config.host = "...";config.username = "...";config.password = "...";HttpRequest request = new HttpRequest("...");request.setConfig(config);System.out.println(request.getString());

POST请求

HttpRequest request = new HttpRequest("...");request.addHeader("...", "...");request.setPostBody("....");request.execute();System.out.println(request.getStatusCode());

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