Http请求Demo

1、maven依赖

<!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpcore --><dependency>    <groupId>org.apache.httpcomponents</groupId>    <artifactId>httpcore</artifactId>    <version>4.4.10</version></dependency><!-- https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient --><dependency>    <groupId>org.apache.httpcomponents</groupId>    <artifactId>httpclient</artifactId>    <version>4.5.6</version></dependency>2、代码

package com.antaiib.atenergy.dao;import java.io.BufferedReader;import java.io.InputStream;import java.io.InputStreamReader;import java.io.UnsupportedEncodingException;import java.net.HttpURLConnection;import java.net.URL;import java.net.URLEncoder;public class HttpURLConnectionHelper {    public static String sendRequest(String urlParam, String requestType) {        HttpURLConnection con = null;        BufferedReader buffer = null;        StringBuffer resultBuffer = null;        try {            URL url = new URL(urlParam);            //得到连接对象            con = (HttpURLConnection) url.openConnection();            //设置请求类型            con.setRequestMethod(requestType);            //设置请求需要返回的数据类型和字符集类型            con.setRequestProperty("Content-Type", "application/json;charset=utf-8");            //允许写出            con.setDoOutput(true);            //允许读入            con.setDoInput(true);            //不使用缓存            con.setUseCaches(false);            //得到响应码            int responseCode = con.getResponseCode();            if (responseCode == HttpURLConnection.HTTP_OK) {                //得到响应流                InputStream inputStream = con.getInputStream();                //将响应流转换成字符串                resultBuffer = new StringBuffer();                String line;                buffer = new BufferedReader(new InputStreamReader(inputStream, "utf-8"));                while ((line = buffer.readLine()) != null) {                    resultBuffer.append(line);                }                return resultBuffer.toString();            }        } catch (Exception e) {            e.printStackTrace();        }        return "";    }    public static void main(String[] args) throws UnsupportedEncodingException {        String unitCode = "520200000000";        String content = "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";        content = URLEncoder.encode(content,"utf-8");        String delalUrl ="http://ip地址/energy/dealData?content="+ content +"&unitCode="+unitCode;        System.out.println(sendRequest(delalUrl,"POST"));//        String publicKey = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCLz2yI+4AnRDJrKLQxb4kKKv2p5DW+u1iH60Xv+SaVYMADQAdKekBqPMAXWd/CHNqS1HrmtXuojgzHFP3tmAFk5ipvTcPL4RklXulcqQ4xaz8S+cnMBQTbVhgfZhJOGuum6CDnP3+6OEXbfuF9A7dYQvJo+Dho8u+G60qfX2DFFQIDAQAB";//        publicKey = URLEncoder.encode(publicKey,"utf-8");////        String uploadKeyUrl = "http://ip地址/energy/uploadPublicKey?publicKey=" + publicKey + "&unitCode=" + unitCode;////        System.out.println(sendRequest(uploadKeyUrl, "POST"));////        String checkUrl ="http://ip地址/energy/getPublicKey?unitCode="+unitCode;//        System.out.println(sendRequest(checkUrl,"GET"));    }}