一、创建一个servlet来接收get或post请求

package guwen;    import java.io.IOException;  import java.io.InputStream;  import java.io.PrintWriter;    import javax.servlet.ServletException;  import javax.servlet.http.HttpServlet;  import javax.servlet.http.HttpServletRequest;  import javax.servlet.http.HttpServletResponse;    import org.dom4j.Document;  import org.dom4j.DocumentException;  import org.dom4j.io.SAXReader;    public class TestServlet extends HttpServlet{        /**       * 接收get请求       */      @Override      protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {          req.setCharacterEncoding("UTF-8");          resp.setCharacterEncoding("UTF-8");          System.out.println(req.getQueryString());  //打印参数          PrintWriter out = resp.getWriter();          out.print("响应");  //响应      }        /**       * 接收post请求       */      @Override      protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {          resp.setCharacterEncoding("UTF-8");          req.setCharacterEncoding("UTF-8");          System.out.println(req.getQueryString());  //打印参数          InputStream inputStream = req.getInputStream();          SAXReader reader = new SAXReader();          try {              Document document = reader.read(inputStream);  //报文体              System.out.println(document.asXML());          } catch (DocumentException e) {              e.printStackTrace();          }          PrintWriter out = resp.getWriter();          out.print("响应");  //响应      }          }

二、发送请求

package guwen;    import java.io.IOException;    import org.apache.http.HttpEntity;  import org.apache.http.client.ClientProtocolException;  import org.apache.http.client.config.RequestConfig;  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.HttpClientBuilder;  import org.apache.http.util.EntityUtils;      public class ConnectionUtil {            public static void main(String[] args) throws ClientProtocolException, IOException {          //sent get          doGet("http://localhost:8088/sentTest/test?p=123");          //sent post          doPost("http://localhost:8088/sentTest/test?p=321","<xml><a>aa</a><b>哈</b></xml>");      }            /**       * 发送get请求       * @throws IOException        */      public static String doGet(String url) throws ClientProtocolException, IOException {                    CloseableHttpClient httpClient = HttpClientBuilder.create().build();                      HttpGet httpGet = new HttpGet(url);                   //配置请求的超时设置            RequestConfig requestConfig = RequestConfig.custom()                      .setConnectionRequestTimeout(50)                    .setConnectTimeout(50)                      .setSocketTimeout(50).build();              httpGet.setConfig(requestConfig);                         CloseableHttpResponse response = null;          String res = null;          try {              response = httpClient.execute(httpGet);   //发送请求              System.out.println("StatusCode -> " + response.getStatusLine().getStatusCode());                HttpEntity entity = response.getEntity();                        res = EntityUtils.toString(entity,"utf-8");                 System.out.println(res);            } catch (ClientProtocolException e) {              throw e;          } catch (IOException e) {              throw e;          } finally{              httpGet.releaseConnection();           }                      return res;      }                        /**       * 发送get请求       * @throws IOException        */      public static String doPost(String url,String body) throws IOException {                    CloseableHttpClient httpclient = HttpClientBuilder.create().build();            HttpPost httpPost = new HttpPost(url);          //配置请求的超时设置            RequestConfig requestConfig = RequestConfig.custom()                      .setConnectionRequestTimeout(50)                    .setConnectTimeout(50)                      .setSocketTimeout(50).build();              httpPost.setConfig(requestConfig);                     CloseableHttpResponse response = null;          String res = null;          try {              if (body != null) {  //设置报文体 设置编码为 UTF-8                  StringEntity entity = new StringEntity(body, "UTF-8");                  httpPost.setEntity(entity);              }              response = httpclient.execute(httpPost);  //发送请求              System.out.println(response.toString());                              HttpEntity entity = response.getEntity();                res = EntityUtils.toString(entity, "utf-8");                System.out.println(res);            } catch (ClientProtocolException e) {              throw e;          } catch (IOException e) {              throw e;          } finally{              httpPost.releaseConnection();          }                    return res;                          }              }