httpclient模拟post请求json封装表单数据
以下代码包括最基本的GET、POST、JSON参数的POST方式的请求。(相当于POSTMAN中使用raw编写的参数)
package com.chinecredit.eccis.utils; import java.io.IOException; import java.io.UnsupportedEncodingException; import java.util.ArrayList; import java.util.List; import java.util.Map; import java.util.Set; import org.apache.http.HttpEntity; import org.apache.http.HttpStatus; import org.apache.http.NameValuePair; import org.apache.http.ParseException; import org.apache.http.client.ClientProtocolException; import org.apache.http.client.entity.UrlEncodedFormEntity; import org.apache.http.client.methods.CloseableHttpResponse; import org.apache.http.client.methods.HttpGet; import org.apache.http.client.methods.HttpPost; 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 org.slf4j.Logger; import org.slf4j.LoggerFactory; import com.alibaba.fastjson.JSONObject; /** * http访问方法实现 * @author 王俊南 * @date: 2018-11-22 */ public class HttpRequestUtils { private static Logger logger = LoggerFactory .getLogger(HttpRequestUtils.class); // 日志记录 /** * GET提交 * * @return */ public static String doGet(String url) { String strResult = ""; // 1. 创建一个默认的client实例 CloseableHttpClient client = HttpClients.createDefault(); try { // 2. 创建一个httpget对象 HttpGet httpGet = new HttpGet(url); System.out.println("executing GET request " + httpGet.getURI()); // 3. 执行GET请求并获取响应对象 CloseableHttpResponse resp = client.execute(httpGet); try { // 6. 打印响应长度和响应内容 if (resp.getStatusLine().getStatusCode() == HttpStatus.SC_OK) { // 4. 获取响应体 HttpEntity entity = resp.getEntity(); System.out.println("Response content length = " + entity.getContentLength()); System.out.println("------"); strResult = EntityUtils.toString(resp.getEntity()); } } finally { //无论请求成功与否都要关闭resp resp.close(); } } catch (ClientProtocolException e) { logger.error("get请求失败:", e); // e.printStackTrace(); } catch (ParseException e) { logger.error("get请求解析出错:", e); // e.printStackTrace(); } catch (IOException e) { logger.error("get请求IO出错:", e); // e.printStackTrace(); } finally { // 8. 最终要关闭连接,释放资源 try { client.close(); } catch (Exception e) { logger.error("get请求完毕关闭连接出错:", e); // e.printStackTrace(); } } return strResult; } /** * 普通POST提交 * @param url * @param map * @return */ public static String doPost(String url, Map<String, Object> map) { String strResult = ""; // 1. 获取默认的client实例 CloseableHttpClient client = HttpClients.createDefault(); // 2. 创建httppost实例 HttpPost httpPost = new HttpPost(url); // 3. 创建参数队列(键值对列表) List<NameValuePair> paramPairs = new ArrayList<>(); Set<String> keySet = map.keySet(); for (String key : keySet) { Object val = map.get(key); paramPairs.add(new BasicNameValuePair(key, val.toString())); } UrlEncodedFormEntity entity; try { // 4. 将参数设置到entity对象中 entity = new UrlEncodedFormEntity(paramPairs, "UTF-8"); // 5. 将entity对象设置到httppost对象中 httpPost.setEntity(entity); // 6. 发送请求并回去响应 CloseableHttpResponse resp = client.execute(httpPost); try { // 7. 获取响应entity HttpEntity respEntity = resp.getEntity(); strResult = EntityUtils.toString(respEntity, "UTF-8"); } finally { // 9. 关闭响应对象 resp.close(); } } catch (ClientProtocolException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { // 10. 关闭连接,释放资源 try { client.close(); } catch (Exception e) { e.printStackTrace(); } } return strResult; } /** * json参数方式POST提交 * @param url * @param params * @return */ public static String doPost(String url, JSONObject params){ String strResult = ""; // 1. 获取默认的client实例 CloseableHttpClient client = HttpClients.createDefault(); // 2. 创建httppost实例 HttpPost httpPost = new HttpPost(url); httpPost.addHeader("Content-Type", "application/json;charset=utf-8"); //添加请求头 try { httpPost.setEntity(new StringEntity(params.toJSONString(),"utf-8")); CloseableHttpResponse resp = client.execute(httpPost); try { // 7. 获取响应entity HttpEntity respEntity = resp.getEntity(); strResult = EntityUtils.toString(respEntity, "UTF-8"); } finally { resp.close(); } } catch (ClientProtocolException e) { e.printStackTrace(); } catch (UnsupportedEncodingException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } finally { try { client.close(); } catch (Exception e) { e.printStackTrace(); } } return strResult; } }