Java_HttpURLConnection使用

Posted 2020-07-28 gossip

包括使用HttpURLConnection执行get/post请求

 

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package com.cn.testproject; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; public class HttpConnectionUrlDemo {     public static void main(String[] args) throws Exception {         //get();         post();     }       public static void get() throws Exception {         String path = "http://www.baidu.com";         URL url = new URL(path);         HttpURLConnection conn = (HttpURLConnection) url.openConnection();         conn.setConnectTimeout(5 * 1000);         conn.setRequestMethod("GET");         InputStream inStream = conn.getInputStream();         byte[] data = toByteArray(inStream);         String result = new String(data, "UTF-8");         System.out.println(result);     }       public static void post() throws Exception {         String encoding = "UTF-8";         //post的form参数(json兼职对)         String params = "[{\"addTime\":\"2011-09-19 14:23:02\"[],\"iccid\":\"1111\",\"id\":0,\"imei\":\"2222\",\"imsi\":\"3333\",\"phoneType\":\"4444\",\"remark\":\"aaaa\",\"tel\":\"5555\"}]";         String path = "http://www.baidu.com";         byte[] data = params.getBytes(encoding);         URL url = new URL(path);         HttpURLConnection conn = (HttpURLConnection) url.openConnection();         conn.setRequestMethod("POST");         conn.setDoOutput(true);               conn.setRequestProperty("Content-Type", "application/x-javascript; charset=" + encoding);         conn.setRequestProperty("Content-Length", String.valueOf(data.length));         conn.setConnectTimeout(5 * 1000);         OutputStream outStream = conn.getOutputStream();         outStream.write(data);         outStream.flush();         outStream.close();         System.out.println(conn.getResponseCode()); // 响应代码 200表示成功         if (conn.getResponseCode() == 200) {             InputStream inStream = conn.getInputStream();             String result = new String(toByteArray(inStream), "UTF-8");             System.out.println(result); // 响应代码 200表示成功         }     }     private static byte[] toByteArray(InputStream input) throws IOException {         ByteArrayOutputStream output = new ByteArrayOutputStream();         byte[] buffer = new byte[4096];         int n = 0;         while (-1 != (n = input.read(buffer))) {             output.write(buffer, 0, n);         }         return output.toByteArray();     } }