【httpclient-4.3.1.jar】httpclient发送get、post请求以及携带数据上传文件
工具类封装如下：
1 package cn.qlq.utils; 2 3 import java.io.File; 4 import java.io.IOException; 5 import java.nio.charset.StandardCharsets; 6 import java.util.ArrayList; 7 import java.util.HashMap; 8 import java.util.Iterator; 9 import java.util.List; 10 import java.util.Map; 11 import java.util.Map.Entry; 12 import java.util.Set; 13 14 import org.apache.commons.io.IOUtils; 15 import org.apache.http.HttpEntity; 16 import org.apache.http.HttpStatus; 17 import org.apache.http.NameValuePair; 18 import org.apache.http.ParseException; 19 import org.apache.http.client.entity.UrlEncodedFormEntity; 20 import org.apache.http.client.methods.CloseableHttpResponse; 21 import org.apache.http.client.methods.HttpGet; 22 import org.apache.http.client.methods.HttpPost; 23 import org.apache.http.entity.ContentType; 24 import org.apache.http.entity.StringEntity; 25 import org.apache.http.entity.mime.HttpMultipartMode; 26 import org.apache.http.entity.mime.MultipartEntityBuilder; 27 import org.apache.http.entity.mime.content.FileBody; 28 import org.apache.http.impl.client.CloseableHttpClient; 29 import org.apache.http.impl.client.HttpClientBuilder; 30 import org.apache.http.message.BasicNameValuePair; 31 import org.apache.http.protocol.HTTP; 32 import org.apache.http.util.EntityUtils; 33 import org.slf4j.Logger; 34 import org.slf4j.LoggerFactory; 35 36 /** 37 * http工具类的使用 38 * 39 * @author Administrator 40 * 41 */ 42 public class HttpUtils { 43 44 private static Logger logger = LoggerFactory.getLogger(HttpUtils.class); 45 46 /** 47 * get请求 48 * 49 * @return 50 */ 51 public static String doGet(String url) { 52 CloseableHttpClient client = null; 53 CloseableHttpResponse response = null; 54 try { 55 // 定义HttpClient 56 client = HttpClientBuilder.create().build(); 57 // 发送get请求 58 HttpGet request = new HttpGet(url); 59 // 执行请求 60 response = client.execute(request); 61 62 return getResponseResult(response); 63 } catch (Exception e) { 64 logger.error("execute error,url: {}", url, e); 65 } finally { 66 IOUtils.closeQuietly(response); 67 IOUtils.closeQuietly(client); 68 } 69 70 return ""; 71 } 72 73 /** 74 * get请求携带参数 75 * 76 * @return 77 */ 78 public static String doGetWithParams(String url, Map<String, String> params) { 79 CloseableHttpClient client = null; 80 CloseableHttpResponse response = null; 81 try { 82 // 定义HttpClient 83 client = HttpClientBuilder.create().build(); 84 85 // 1.转化参数 86 if (params != null && params.size() > 0) { 87 List<NameValuePair> nvps = new ArrayList<NameValuePair>(); 88 for (Iterator<String> iter = params.keySet().iterator(); iter.hasNext();) { 89 String name = iter.next(); 90 String value = params.get(name); 91 nvps.add(new BasicNameValuePair(name, value)); 92 } 93 String paramsStr = EntityUtils.toString(new UrlEncodedFormEntity(nvps, HTTP.UTF_8)); 94 url += "?" + paramsStr; 95 } 96 97 HttpGet request = new HttpGet(url); 98 response = client.execute(request); 99 100 return getResponseResult(response); 101 } catch (IOException e) { 102 logger.error("execute error,url: {}", url, e); 103 } finally { 104 IOUtils.closeQuietly(response); 105 IOUtils.closeQuietly(client); 106 } 107 108 return ""; 109 } 110 111 public static String doPost(String url, Map<String, String> params) { 112 CloseableHttpClient client = null; 113 CloseableHttpResponse response = null; 114 try { 115 // 定义HttpClient 116 client = HttpClientBuilder.create().build(); 117 HttpPost request = new HttpPost(url); 118 119 // 1.转化参数 120 if (params != null && params.size() > 0) { 121 List<NameValuePair> nvps = new ArrayList<NameValuePair>(); 122 for (Iterator<String> iter = params.keySet().iterator(); iter.hasNext();) { 123 String name = iter.next(); 124 String value = params.get(name); 125 nvps.add(new BasicNameValuePair(name, value)); 126 } 127 request.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8)); 128 } 129 130 response = client.execute(request); 131 return getResponseResult(response); 132 } catch (IOException e) { 133 logger.error("execute error,url: {}", url, e); 134 } finally { 135 IOUtils.closeQuietly(response); 136 IOUtils.closeQuietly(client); 137 } 138 139 return ""; 140 } 141 142 public static String doPost(String url, String params) { 143 return doPost(url, params, false); 144 } 145 146 /** 147 * post请求（用于请求json格式的参数） 148 * 149 * @param url 150 * @param params 151 * @param isJsonData 152 * @return 153 */ 154 public static String doPost(String url, String params, boolean isJsonData) { 155 CloseableHttpClient client = null; 156 CloseableHttpResponse response = null; 157 try { 158 // 定义HttpClient 159 client = HttpClientBuilder.create().build(); 160 161 HttpPost request = new HttpPost(url); 162 StringEntity entity = new StringEntity(params, HTTP.UTF_8); 163 request.setEntity(entity); 164 165 if (isJsonData) { 166 request.setHeader("Accept", "application/json"); 167 request.setHeader("Content-Type", "application/json"); 168 } 169 170 response = client.execute(request); 171 172 return getResponseResult(response); 173 } catch (IOException e) { 174 logger.error("execute error,url: {}", url, e); 175 } finally { 176 IOUtils.closeQuietly(response); 177 IOUtils.closeQuietly(client); 178 } 179 180 return ""; 181 } 182 183 /** 184 * 上传文件携带参数发送请求 185 * 186 * @param url 187 * URL 188 * @param fileName 189 * neme，相当于input的name 190 * @param filePath 191 * 本地路径 192 * @param params 193 * 参数 194 * @return 195 */ 196 public static String doPostWithFile(String url, String fileName, String filePath, Map<String, String> params) { 197 CloseableHttpClient httpclient = HttpClientBuilder.create().build(); 198 CloseableHttpResponse response = null; 199 try { 200 MultipartEntityBuilder multipartEntityBuilder = MultipartEntityBuilder.create(); 201 202 // 上传文件,如果不需要上传文件注掉此行 203 multipartEntityBuilder.setMode(HttpMultipartMode.BROWSER_COMPATIBLE).addPart(fileName, 204 new FileBody(new File(filePath))); 205 206 if (params != null && params.size() > 0) { 207 Set<Entry<String, String>> entrySet = params.entrySet(); 208 for (Entry<String, String> entry : entrySet) { 209 multipartEntityBuilder.addTextBody(entry.getKey(), entry.getValue(), 210 ContentType.create(HTTP.PLAIN_TEXT_TYPE, StandardCharsets.UTF_8)); 211 } 212 } 213 214 HttpEntity httpEntity = multipartEntityBuilder.build(); 215 216 HttpPost httppost = new HttpPost(url); 217 httppost.setEntity(httpEntity); 218 219 response = httpclient.execute(httppost); 220 return getResponseResult(response); 221 } catch (Exception e) { 222 logger.error("execute error,url: {}", url, e); 223 } finally { 224 IOUtils.closeQuietly(response); 225 IOUtils.closeQuietly(httpclient); 226 } 227 228 return ""; 229 } 230 231 private static String getResponseResult(CloseableHttpResponse response) throws ParseException, IOException { 232 /** 请求发送成功，并得到响应 **/ 233 if (response != null) { 234 if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { 235 return EntityUtils.toString(response.getEntity(), "utf-8"); 236 } else { 237 logger.error("getResponseResult code error, code: {}", response.getStatusLine().getStatusCode()); 238 } 239 } 240 241 return ""; 242 } 243 }
上述代码支持application/json数据的传送。post方法的isJsonData 为true即在请求头部加上application/json。
测试：
1 public static void main(String[] args) { 2 String doGet = doGet("http://localhost:8088//weixin/test/test.html?name=zs&age=25"); 3 System.out.println(doGet); 4 5 Map<String, String> map = new HashMap<String, String>(); 6 map.put("xx", "xxx"); 7 String doGetWithParams = doGetWithParams("http://localhost:8088//weixin/test/test.html", map); 8 System.out.println(doGetWithParams); 9 10 String doPost = doPost("http://localhost:8088//weixin/test/test.html?name=zs&age=25", ""); 11 System.out.println(doPost); 12 13 String doPost2 = doPost("http://localhost:8088//weixin/test/test.html?name=zs&age=25", map); 14 System.out.println(doPost2); 15 }
