HttpClientUtil 工具类实现跨域请求数据

  1 package com.xxx.common.util;
  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 public class HttpClientUtil {
 22 
 23     public static String doGet(String url, Map<String, String> param) {
 24         // 创建Httpclient对象
 25         CloseableHttpClient httpclient = HttpClients.createDefault();
 26         String resultString = "";
 27         CloseableHttpResponse response = null;
 28         try {
 29             // 创建uri
 30             URIBuilder builder = new URIBuilder(url);
 31             if (param != null) {
 32                 for (String key : param.keySet()) {
 33                     builder.addParameter(key, param.get(key));
 34                 }
 35             }
 36             URI uri = builder.build();
 37 
 38             // 创建http GET请求
 39             HttpGet httpGet = new HttpGet(uri);
 40 
 41             // 执行请求
 42             response = httpclient.execute(httpGet);
 43             // 判断返回状态是否为200
 44             if (response.getStatusLine().getStatusCode() == 200) {
 45                 resultString = EntityUtils.toString(response.getEntity(), "UTF-8");
 46             }
 47         } catch (Exception e) {
 48             e.printStackTrace();
 49         } finally {
 50             try {
 51                 if (response != null) {
 52                     response.close();
 53                 }
 54                 httpclient.close();
 55             } catch (IOException e) {
 56                 e.printStackTrace();
 57             }
 58         }
 59         return resultString;
 60     }
 61 
 62     public static String doGet(String url) {
 63         return doGet(url, null);
 64     }
 65 
 66     public static String doPost(String url, Map<String, String> param) {
 67         // 创建Httpclient对象
 68         CloseableHttpClient httpClient = HttpClients.createDefault();
 69         CloseableHttpResponse response = null;
 70         String resultString = "";
 71         try {
 72             // 创建Http Post请求
 73             HttpPost httpPost = new HttpPost(url);
 74             // 创建参数列表
 75             if (param != null) {
 76                 List<NameValuePair> paramList = new ArrayList<>();
 77                 for (String key : param.keySet()) {
 78                     paramList.add(new BasicNameValuePair(key, param.get(key)));
 79                 }
 80                 // 模拟表单
 81                 UrlEncodedFormEntity entity = new UrlEncodedFormEntity(paramList, "utf-8");
 82                 httpPost.setEntity(entity);
 83             }
 84             // 执行http请求
 85             response = httpClient.execute(httpPost);
 86             resultString = EntityUtils.toString(response.getEntity(), "utf-8");
 87         } catch (Exception e) {
 88             e.printStackTrace();
 89         } finally {
 90             try {
 91                 response.close();
 92             } catch (IOException e) {
 93                 e.printStackTrace();
 94             }
 95         }
 96         return resultString;
 97     }
 98 
 99     public static String doPost(String url) {
100         return doPost(url, null);
101     }
102 
103     /**
104      * 请求的参数类型为json
105      * @param url
106      * @param json
107      * @return
108      * {username:"",pass:""}
109      */
110     public static String doPostJson(String url, String json) {
111         // 创建Httpclient对象
112         CloseableHttpClient httpClient = HttpClients.createDefault();
113         CloseableHttpResponse response = null;
114         String resultString = "";
115         try {
116             // 创建Http Post请求
117             HttpPost httpPost = new HttpPost(url);
118             // 创建请求内容
119             StringEntity entity = new StringEntity(json, ContentType.APPLICATION_JSON);
120             httpPost.setEntity(entity);
121             // 执行http请求
122             response = httpClient.execute(httpPost);
123             resultString = EntityUtils.toString(response.getEntity(), "utf-8");
124         } catch (Exception e) {
125             e.printStackTrace();
126         } finally {
127             try {
128                 response.close();
129             } catch (IOException e) {
130                 e.printStackTrace();
131             }
132         }
133         return resultString;
134     }
135 }
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原文地址：https://www.cnblogs.com/bignew/p/6715671.html
HttpClientUtil 工具类 实现跨域请求数据

HttpClientUtil 工具类实现跨域请求数据
