String url = "http://www.baidu.com";//将要访问的url字符串放入HttpPost中HttpPost httpPost= new HttpPost(url);//请求头 放置一些修改http请求头和cookiehttpPost.setHeader("Accept", "application/json");......//如果是HttpPost或者HttpPut请求需要在请求里加参数，//而HttpGet或者HttpDelete请求则可以直接拼接到url字符串后面//向HttpPost中加入参数List<NameValuePair> values = new ArrayList<NameValuePair>();values.add(new NameValuePair("id", "1"));values.add(new NameValuePair("name", "xiaohong"));httpPost.setEntity(new UrlEncodeFormEntity(values, HTTP.UTF_8));  //进行转码//实例HttpClient 并执行带有HttpPost的方法,返回HttpResponse 响应，再进行操作HttpClient httpClient = new DefaultHttpClient();HttpResponse httpResponse = httpClient.execute(httpPost);int statusCode = httpResponse.getStatusLine().getStatusCode();  //返回状态码 ，用来进行识别或者判断访问结果if(statusCode == 200){Instream in = httpResponse.getEntity().getContent();  //要处理该数据流是否为GZIP流}示例代码如下：package cn.dratek.haoyingsheng.manager.client;import cn.dratek.haoyingsheng.manager.util.ResourceUtil;
import net.dratek.browser.http.Cookie;
import net.dratek.browser.http.CookieManager;
import net.dratek.browser.http.URL;
import org.apache.http.*;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpDelete;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.HTTP;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.util.List;public class HttpNetClient {/*** 所有get 请求底层调用方法** @param url 请求url* @return byte[] response data*/public static byte[] doGet(String url) {InputStream in;byte[] bre = null;HttpResponse response;CookieManager manager = CookieManager.getInstance();if (url != null && url.length() != 0) {URL myURL = URL.parseString(url);Cookie[] cookies = manager.getCookies(myURL);HttpGet httpGet = new HttpGet(url);if (cookies != null && cookies.length > 0) {StringBuilder sb = new StringBuilder();for (Cookie ck : cookies) {sb.append(ck.name).append('=').append(ck.value).append(";");}String sck = sb.toString();if (sck.length() > 0) {httpGet.setHeader("Cookie", sck);}//if}//ifhttpGet.setHeader("Accept-Encoding", "gzip, deflate");httpGet.setHeader("Accept-Language", "zh-CN");httpGet.setHeader("Accept", "application/json, application/xml, text/html, text/*, image/*, */*");try {response = new DefaultHttpClient().execute(httpGet);if (response != null) {int statusCode = response.getStatusLine().getStatusCode();if (statusCode == 200 || statusCode == 403) {Header[] headers = response.getHeaders("Set-Cookie");if (headers != null && headers.length > 0) {for (Header header : headers) {manager.setCookie(myURL, header.getValue());}//for}//ifin = response.getEntity().getContent();if (in != null) {bre = ResourceUtil.readStream(in);}//if}//if}//if} //trycatch (IOException e) {e.printStackTrace();}}return bre;}/*** 所有Post 请求底层调用方法** @param url    请求url* @param values 传递的参数* @return byte[] 返回数据 or null*/public static byte[] doPost(String url, List<NameValuePair> values) {System.out.println("url = " + url);byte[] bytes = null;HttpResponse response;InputStream inputStream = null;CookieManager manager = CookieManager.getInstance();if (url != null && url.length() != 0) {URL myurl = URL.parseString(url);Cookie[] cookies = manager.getCookies(myurl);HttpPost post = new HttpPost(url);if (cookies != null && cookies.length > 0) {StringBuilder sb = new StringBuilder();for (Cookie ck : cookies) {sb.append(ck.name).append('=').append(ck.value).append(";");}//forString sck = sb.toString();if (sck.length() > 0) {post.setHeader("Cookie", sck);}//if}//ifpost.setHeader("Accept-Encoding", "gzip, deflate");post.setHeader("Accept-Language", "zh-CN");post.setHeader("Accept", "application/json, application/xml, text/html, text/*, image/*, */*");DefaultHttpClient client = new DefaultHttpClient();try {if (values != null && values.size() > 0) {post.setEntity(new UrlEncodedFormEntity(values, HTTP.UTF_8));}response = client.execute(post);if (response != null) {int statusCode = response.getStatusLine().getStatusCode();if (statusCode == 200 || statusCode == 403) {Header[] headers = response.getHeaders("Set-Cookie");if (headers != null && headers.length > 0) {for (Header header : headers) {manager.setCookie(myurl, header.getValue());}//for}//ifinputStream = response.getEntity().getContent();}//if}//if}//trycatch (UnsupportedEncodingException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}if (inputStream != null) {bytes = ResourceUtil.readStream(inputStream);}}return bytes;}/*** PUT基础请求** @param url    请求地址* @param values 提交参数* @return byte[] 请求成功后的结果*/public static byte[] doPut(String url, List<NameValuePair> values) {byte[] ret = null;CookieManager manager = CookieManager.getInstance();if (url != null && url.length() > 0) {URL myUrl = URL.parseString(url);StringBuilder sb = new StringBuilder();Cookie[] cookies = manager.getCookies(myUrl);if (cookies != null && cookies.length > 0) {for (Cookie cookie : cookies) {sb.append(cookie.name).append("=").append(cookie.value).append(";");}//for}//ifHttpPut request = new HttpPut(url);String sck = sb.toString();if (sck.length() > 0) {request.setHeader("Cookie", sck);}request.setHeader("Accept-Encoding", "gzip, deflate");request.setHeader("Accept-Language", "zh-CN");request.setHeader("Accept", "application/json, application/xml, text/html, text/*, image/*, */*");DefaultHttpClient client = new DefaultHttpClient();if (values != null && values.size() > 0) {try {UrlEncodedFormEntity entity;entity = new UrlEncodedFormEntity(values);request.setEntity(entity);} catch (UnsupportedEncodingException e) {e.printStackTrace();}}//iftry {HttpResponse response = client.execute(request);if (response != null) {StatusLine statusLine = response.getStatusLine();int statusCode = statusLine.getStatusCode();if (statusCode == 200 || statusCode == 403) {Header[] headers = response.getHeaders("Set-Cookie");if (headers != null && headers.length > 0) {for (Header header : headers) {manager.setCookie(myUrl, header.getValue());}}//ifHttpEntity entity = response.getEntity();InputStream inputStream = entity.getContent();if (inputStream != null) {ret = ResourceUtil.readStream(inputStream);inputStream.close();}//if}//if}//if} //trycatch (IOException e) {e.printStackTrace();}}//ifreturn ret;}/*** Delete基础请求** @param url 请求地址* @return 请求成功后的结果*/public static byte[] doDelete(String url) {InputStream in;byte[] bre = null;HttpResponse response;CookieManager manager = CookieManager.getInstance();if (url != null && url.length() != 0) {URL myurl = URL.parseString(url);Cookie[] cookies = manager.getCookies(myurl);HttpDelete delete = new HttpDelete(url);if (cookies != null && cookies.length > 0) {StringBuilder sb = new StringBuilder();for (Cookie ck : cookies) {sb.append(ck.name).append('=').append(ck.value).append(";");}//forString sck = sb.toString();if (sck.length() > 0) {delete.setHeader("Cookie", sck);}}//fordelete.setHeader("Accept-Encoding", "gzip, deflate");delete.setHeader("Accept-Language", "zh-CN");delete.setHeader("Accept", "application/json, application/xml, text/html, text/*, image/*, */*");try {response = new DefaultHttpClient().execute(delete);if (response != null) {int statusCode = response.getStatusLine().getStatusCode();if (statusCode == 200 || statusCode == 403) {Header[] headers = response.getHeaders("Set-Cookie");if (headers != null && headers.length > 0) {for (Header header : headers) {manager.setCookie(myurl, header.getValue());}//for}//ifin = response.getEntity().getContent();if (in != null) {bre = ResourceUtil.readStream(in);}}//if}//if} catch (IOException e) {e.printStackTrace();}}return bre;}}