java httpclient

  1 package com.ss.utils;
  2 
  3 import java.io.IOException;
  4 import java.net.URI;
  5 import java.util.ArrayList;
  6 import java.util.List;
  7 import java.util.Map;
  8 
  9 import org.apache.http.NameValuePair;
 10 import org.apache.http.client.entity.UrlEncodedFormEntity;
 11 import org.apache.http.client.methods.CloseableHttpResponse;
 12 import org.apache.http.client.methods.HttpGet;
 13 import org.apache.http.client.methods.HttpPost;
 14 import org.apache.http.client.utils.URIBuilder;
 15 import org.apache.http.entity.ContentType;
 16 import org.apache.http.entity.StringEntity;
 17 import org.apache.http.impl.client.CloseableHttpClient;
 18 import org.apache.http.impl.client.HttpClients;
 19 import org.apache.http.message.BasicNameValuePair;
 20 import org.apache.http.util.EntityUtils;
 21 
 22 public class HttpClientUtil {
 23 
 24     public static String doGet(String url, Map<String, String> param) {
 25 
 26         // 创建Httpclient对象
 27         CloseableHttpClient httpclient = HttpClients.createDefault();
 28 
 29         String resultString = "";
 30         CloseableHttpResponse response = null;
 31         try {
 32             // 创建uri
 33             URIBuilder builder = new URIBuilder(url);
 34             if (param != null) {
 35                 for (String key : param.keySet()) {
 36                     builder.addParameter(key, param.get(key));
 37                 }
 38             }
 39             URI uri = builder.build();
 40 
 41             // 创建http GET请求
 42             HttpGet httpGet = new HttpGet(uri);
 43 
 44             // 执行请求
 45             response = httpclient.execute(httpGet);
 46             // 判断返回状态是否为200
 47             if (response.getStatusLine().getStatusCode() == 200) {
 48                 resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
 49             }
 50         } catch (Exception e) {
 51             e.printStackTrace();
 52         } finally {
 53             try {
 54                 if (response != null) {
 55                     response.close();
 56                 }
 57                 httpclient.close();
 58             } catch (IOException e) {
 59                 e.printStackTrace();
 60             }
 61         }
 62         return resultString;
 63     }
 64 
 65     public static String doGet(String url) {
 66         return doGet(url, null);
 67     }
 68 
 69     public static String doPost(String url, Map<String, String> param) {
 70         // 创建Httpclient对象
 71         CloseableHttpClient httpClient = HttpClients.createDefault();
 72         CloseableHttpResponse response = null;
 73         String resultString = "";
 74         try {
 75             // 创建Http Post请求
 76             HttpPost httpPost = new HttpPost(url);
 77             // 创建参数列表
 78             if (param != null) {
 79                 List<NameValuePair> paramList = new ArrayList<>();
 80                 for (String key : param.keySet()) {
 81                     paramList.add(new BasicNameValuePair(key, param.get(key)));
 82                 }
 83                 // 模拟表单
 84                 UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList);
 85                 httpPost.setEntity(entity);
 86             }
 87             // 执行http请求
 88             response = httpClient.execute(httpPost);
 89             resultString = EntityUtils.toString(response.getEntity(), "utf-8");
 90         } catch (Exception e) {
 91             e.printStackTrace();
 92         } finally {
 93             try {
 94                 response.close();
 95             } catch (IOException e) {
 96                 // TODO Auto-generated catch block
 97                 e.printStackTrace();
 98             }
 99         }
100 
101         return resultString;
102     }
103 
104     public static String doPost(String url) {
105         return doPost(url, null);
106     }
107     
108     public static String doPostJson(String url, String json) {
109         // 创建Httpclient对象
110         CloseableHttpClient httpClient = HttpClients.createDefault();
111         CloseableHttpResponse response = null;
112         String resultString = "";
113         try {
114             // 创建Http Post请求
115             HttpPost httpPost = new HttpPost(url);
116             // 创建请求内容
117             StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
118             httpPost.setEntity(entity);
119             // 执行http请求
120             response = httpClient.execute(httpPost);
121             resultString = EntityUtils.toString(response.getEntity(), "utf-8");
122         } catch (Exception e) {
123             e.printStackTrace();
124         } finally {
125             try {
126                 response.close();
127             } catch (IOException e) {
128                 // TODO Auto-generated catch block
129                 e.printStackTrace();
130             }
131         }
132 
133         return resultString;
134     }
135 }