Java发送GET、POST请求代码，javagetpost请求,一、创建一个servle

Java发送GET、POST请求代码，javagetpost请求,一、创建一个servle

一、创建一个servlet来接收get或post请求 ```javapackage 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 */@Overrideprotected 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 */@Overrideprotected 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javapackage 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;}

}```