通用HttpClientUtil工具类

  1 package com.*.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 import org.apache.http.NameValuePair;
  9 import org.apache.http.client.entity.UrlEncodedFormEntity;
 10 import org.apache.http.client.methods.CloseableHttpResponse;
 11 import org.apache.http.client.methods.HttpGet;
 12 import org.apache.http.client.methods.HttpPost;
 13 import org.apache.http.client.utils.URIBuilder;
 14 import org.apache.http.entity.ContentType;
 15 import org.apache.http.entity.StringEntity;
 16 import org.apache.http.impl.client.CloseableHttpClient;
 17 import org.apache.http.impl.client.HttpClients;
 18 import org.apache.http.message.BasicNameValuePair;
 19 import org.apache.http.util.EntityUtils;
 20 /**
 21  * Created by Administrator on 2018/4/27.
 22  */
 23 public class HttpClientUtil {
 24  
 25     public static String doGet(String url, Map param) {
 26  
 27         // 创建Httpclient对象
 28         CloseableHttpClient httpclient = HttpClients.createDefault();
 29  
 30         String resultString = "";
 31         CloseableHttpResponse response = null;
 32         try {
 33             // 创建uri
 34             URIBuilder builder = new URIBuilder(url);
 35             if (param != null) {
 36                 for (String key : param.keySet()) {
 37                     builder.addParameter(key, param.get(key));
 38                 }
 39             }
 40             URI uri = builder.build();
 41  
 42             // 创建http GET请求
 43             HttpGet httpGet = new HttpGet(uri);
 44  
 45             // 执行请求
 46             response = httpclient.execute(httpGet);
 47             // 判断返回状态是否为200
 48             if (response.getStatusLine().getStatusCode() == 200) {
 49                 resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
 50             }
 51         } catch (Exception e) {
 52             e.printStackTrace();
 53         } finally {
 54             try {
 55                 if (response != null) {
 56                     response.close();
 57                 }
 58                 httpclient.close();
 59             } catch (IOException e) {
 60                 e.printStackTrace();
 61             }
 62         }
 63         return resultString;
 64     }
 65  
 66     public static String doGet(String url) {
 67         return doGet(url, null);
 68     }
 69  
 70     public static String doPost(String url, Map param) {
 71         // 创建Httpclient对象
 72         CloseableHttpClient httpClient = HttpClients.createDefault();
 73         CloseableHttpResponse response = null;
 74         String resultString = "";
 75         try {
 76             // 创建Http Post请求
 77             HttpPost httpPost = new HttpPost(url);
 78             // 创建参数列表
 79             if (param != null) {
 80                 List paramList = new ArrayList<>();
 81                 for (String key : param.keySet()) {
 82                     paramList.add(new BasicNameValuePair(key, param.get(key)));
 83                 }
 84                 // 模拟表单
 85                 UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList,"utf-8");
 86                 httpPost.setEntity(entity);
 87             }
 88             // 执行http请求
 89             response = httpClient.execute(httpPost);
 90             resultString = EntityUtils.toString(response.getEntity(), "utf-8");
 91         } catch (Exception e) {
 92             e.printStackTrace();
 93         } finally {
 94             try {
 95                 response.close();
 96             } catch (IOException e) {
 97                 // TODO Auto-generated catch block
 98                 e.printStackTrace();
 99             }
100         }
101  
102         return resultString;
103     }
104  
105     public static String doPost(String url) {
106         return doPost(url, null);
107     }
108  
109     public static String doPostJson(String url, String json) {
110         // 创建Httpclient对象
111         CloseableHttpClient httpClient = HttpClients.createDefault();
112         CloseableHttpResponse response = null;
113         String resultString = "";
114         try {
115             // 创建Http Post请求
116             HttpPost httpPost = new HttpPost(url);
117             // 创建请求内容
118             StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
119             httpPost.setEntity(entity);
120             // 执行http请求
121             response = httpClient.execute(httpPost);
122             resultString = EntityUtils.toString(response.getEntity(), "utf-8");
123         } catch (Exception e) {
124             e.printStackTrace();
125         } finally {
126             try {
127                 response.close();
128             } catch (IOException e) {
129                 // TODO Auto-generated catch block
130                 e.printStackTrace();
131             }
132         }
133  
134         return resultString;
135     }
136 }