使用HttpClient4.5.3的jar包，对post、get、delete、put请求进行了封装，我是用于服务器集成环信REST接口的，希望对大家有帮助：
package CAM.sys.util; import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.UnsupportedEncodingException; import java.nio.charset.Charset; import java.util.ArrayList; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import org.apache.http.HttpEntity; import org.apache.http.NameValuePair; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.methods.CloseableHttpResponse; 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.client.utils.URLEncodedUtils; import org.apache.http.entity.StringEntity; import org.apache.http.impl.client.CloseableHttpClient; import org.apache.http.impl.client.HttpClients; import org.apache.http.message.BasicNameValuePair; import org.apache.http.util.EntityUtils; import net.sf.json.JSONObject; public class HttpClientUtil { public static JSONObject Delete(String url, JSONObject jsonParam, String... tokens) { CloseableHttpClient httpclient = HttpClients.createDefault(); JSONObject js = null; url = buildGetUrl(url, jsonParam); System.out.println("getURL====>" + url); try { HttpDelete httpDelete = new HttpDelete(url); if (tokens != null && tokens[0] != null && tokens.length == 1) { httpDelete.addHeader("Authorization", "Bearer " + tokens[0]); } CloseableHttpResponse response1 = httpclient.execute(httpDelete); try { System.out.println(response1.getStatusLine()); HttpEntity entity1 = response1.getEntity(); if (entity1 != null) { try { BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(entity1.getContent(), "UTF-8"), 8 * 1024); StringBuilder entityStringBuilder = new StringBuilder(); String line = null; while ((line = bufferedReader.readLine()) != null) { entityStringBuilder.append(line); } js = JSONObject.fromObject(entityStringBuilder.toString()); System.out.println("Delte 返回数据:" + entityStringBuilder.toString()); } catch (Exception e) { e.printStackTrace(); } } EntityUtils.consume(entity1); } catch (IOException e) { e.printStackTrace(); } finally { response1.close(); } } catch (ClientProtocolException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } finally { try { httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } return js; } public static JSONObject Put(String url, JSONObject jsonParam, String... tokens) { JSONObject js = null; CloseableHttpClient httpclient = HttpClients.createDefault(); try { HttpPut httpPut = new HttpPut(url); if (tokens != null && tokens.length == 1) { httpPut.addHeader("Authorization", "Bearer " + tokens[0]); } StringEntity entity = new StringEntity(jsonParam.toString(), "utf-8"); entity.setContentEncoding("UTF-8"); entity.setContentType("application/json"); httpPut.setEntity(entity); CloseableHttpResponse response2 = httpclient.execute(httpPut); try { System.out.println("返回状态:" + response2.getStatusLine()); HttpEntity entity2 = response2.getEntity(); if (entity2 != null) { try { BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(entity2.getContent(), "UTF-8"), 8 * 1024); StringBuilder entityStringBuilder = new StringBuilder(); String line = null; while ((line = bufferedReader.readLine()) != null) { entityStringBuilder.append(line); } System.out.println("Put 返回数据:" + entityStringBuilder.toString()); js = JSONObject.fromObject(entityStringBuilder.toString()); } catch (Exception e) { e.printStackTrace(); } } EntityUtils.consume(entity2); } catch (IOException e) { e.printStackTrace(); } finally { try { response2.close(); } catch (IOException e) { e.printStackTrace(); } } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } finally { try { httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } return js; } public static JSONObject Get(String url, JSONObject jsonParam, String... tokens) { CloseableHttpClient httpclient = HttpClients.createDefault(); JSONObject js = null; url = buildGetUrl(url, jsonParam); System.out.println("getURL====>" + url); try { HttpGet httpGet = new HttpGet(url); if (tokens != null && tokens[0] != null && tokens.length == 1) { httpGet.addHeader("Authorization", "Bearer " + tokens[0]); } CloseableHttpResponse response1 = httpclient.execute(httpGet); try { System.out.println(response1.getStatusLine()); HttpEntity entity1 = response1.getEntity(); if (entity1 != null) { try { BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(entity1.getContent(), "UTF-8"), 8 * 1024); StringBuilder entityStringBuilder = new StringBuilder(); String line = null; while ((line = bufferedReader.readLine()) != null) { entityStringBuilder.append(line); } js = JSONObject.fromObject(entityStringBuilder.toString()); System.out.println("Get 返回数据:" + entityStringBuilder.toString()); } catch (Exception e) { e.printStackTrace(); } } EntityUtils.consume(entity1); } catch (IOException e) { e.printStackTrace(); } finally { response1.close(); } } catch (ClientProtocolException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } finally { try { httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } return js; } public static JSONObject Post(String url, JSONObject jsonParam, String... tokens) { JSONObject js = null; CloseableHttpClient httpclient = HttpClients.createDefault(); try { HttpPost httpPost = new HttpPost(url); if (tokens != null && tokens.length == 1) { httpPost.addHeader("Authorization", "Bearer " + tokens[0]); } StringEntity entity = new StringEntity(jsonParam.toString(), "utf-8"); entity.setContentEncoding("UTF-8"); entity.setContentType("application/json"); httpPost.setEntity(entity); CloseableHttpResponse response2 = httpclient.execute(httpPost); try { System.out.println("返回状态:" + response2.getStatusLine()); HttpEntity entity2 = response2.getEntity(); if (entity2 != null) { try { BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(entity2.getContent(), "UTF-8"), 8 * 1024); StringBuilder entityStringBuilder = new StringBuilder(); String line = null; while ((line = bufferedReader.readLine()) != null) { entityStringBuilder.append(line); } System.out.println("post 返回数据:"+entityStringBuilder.toString()); js = JSONObject.fromObject(entityStringBuilder.toString()); } catch (Exception e) { e.printStackTrace(); } } EntityUtils.consume(entity2); } catch (IOException e) { e.printStackTrace(); } finally { try { response2.close(); } catch (IOException e) { e.printStackTrace(); } } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } finally { try { httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } return js; } private static String buildGetUrl(String url, JSONObject jsonParam) { Map<String, String> map = new HashMap<String, String>(); Iterator<?> it = jsonParam.keys(); while (it.hasNext()) { String key = (String) it.next(); String value = jsonParam.getString(key); map.put(key, value); } StringBuffer uriStr = new StringBuffer(url); if (map != null && !map.isEmpty()) { List<NameValuePair> ps = new ArrayList<NameValuePair>(); for (String key : map.keySet()) { ps.add(new BasicNameValuePair(key, map.get(key))); } uriStr.append("?"); uriStr.append(URLEncodedUtils.format(ps, Charset.forName("UTF-8"))); } return uriStr.toString(); } public static String getToken() { String token = ""; String url = "你的URL"; CloseableHttpClient httpclient = HttpClients.createDefault(); try { HttpPost httpPost = new HttpPost(url); JSONObject jsonParam = new JSONObject(); jsonParam.accumulate("grant_type", "client_credentials"); jsonParam.accumulate("client_id", "你的client_id"); jsonParam.accumulate("client_secret", "你的client_secret"); StringEntity entity = new StringEntity(jsonParam.toString(), "utf-8"); entity.setContentEncoding("UTF-8"); entity.setContentType("application/json"); httpPost.setEntity(entity); CloseableHttpResponse response2 = httpclient.execute(httpPost); try { System.out.println("返回状态:" + response2.getStatusLine()); HttpEntity entity2 = response2.getEntity(); if (entity2 != null) { try { BufferedReader bufferedReader = new BufferedReader( new InputStreamReader(entity2.getContent(), "UTF-8"), 8 * 1024); StringBuilder entityStringBuilder = new StringBuilder(); String line = null; while ((line = bufferedReader.readLine()) != null) { entityStringBuilder.append(line); } System.out.println("getToken 返回数据:" + entityStringBuilder.toString()); token = JSONObject.fromObject(entityStringBuilder.toString()).get("access_token").toString(); } catch (Exception e) { e.printStackTrace(); } } EntityUtils.consume(entity2); } catch (IOException e) { e.printStackTrace(); } finally { try { response2.close(); } catch (IOException e) { e.printStackTrace(); } } } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (ClientProtocolException e1) { e1.printStackTrace(); } catch (IOException e1) { e1.printStackTrace(); } finally { try { httpclient.close(); } catch (IOException e) { e.printStackTrace(); } } return token; } public static void main(String[] args) throws ClientProtocolException, IOException { String token = HttpClientUtil.getToken(); JSONObject jsonParam = new JSONObject(); String url = "你的URL"; jsonParam.accumulate("nickname", "88888"); System.out.println(Put(url,jsonParam,token)); } }