2020-11-05 系统之间的数据交互

我常用的系统之间的数据交互方式有：

1.HTTP  这个现在比较多，一般数据是JSON/XML格式

2.WEBSERVICE 传统互联网金融银行保险用的比较多，电商好像基本不用

3.socket  用的比较少了 老旧项目用的多

4.SFTP/FTP 现在因为安全问题一般都是使用SFTP

5.系统之间共用数据库可能会数据库直接授权。

6.有些服务集群可能会有共享磁盘，大家都有权限去读写。

7.MQ

8.集群有时候中间会过一道NGINX APACHE 之类的

下面放一个http例子：

package com.example.test;import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;import javax.net.ssl.HttpsURLConnection;public class TestHttps {public static void main(String[] args) throws UnsupportedEncodingException  {String aString = "7898989";String urlString = "http:******************* ";executeHttpPostMethod(urlString,aString,"UTF-8");}public static String executeHttpPostMethod(String requestUrl,String request,String charsetName) {String result = "";HttpsURLConnection httpURLConnection = null;ByteArrayOutputStream outputStream = null;InputStream inputStream = null;try {URL url = new URL(requestUrl);httpURLConnection = (HttpsURLConnection) url.openConnection();httpURLConnection.setDoOutput(true);httpURLConnection.setDoInput(true);httpURLConnection.setRequestProperty("Content-Type","text/plain");httpURLConnection.setRequestMethod("POST");httpURLConnection.setInstanceFollowRedirects(true);httpURLConnection.setConnectTimeout(60 * 1000);httpURLConnection.connect();httpURLConnection.getOutputStream().write(request.getBytes(charsetName));httpURLConnection.getOutputStream().flush();outputStream = new ByteArrayOutputStream();inputStream = httpURLConnection.getInputStream();int len = 0;byte[] byteArray = new byte[1024 * 8];while ((len = inputStream.read(byteArray)) != -1) {outputStream.write(byteArray, 0, len);}outputStream.flush();byte[] data = outputStream.toByteArray();result = new String(data, charsetName);} catch (MalformedURLException e) {System.out.println("MalformedURLException 请求报文" + request+e);} catch (ProtocolException e) {System.out.println("ProtocolException 请求报文" + request+ e);} catch (IOException e) {System.out.println("IOException 请求报文" + request+e);} finally {if (inputStream != null) {try {inputStream.close();} catch (IOException e) {System.out.println("error happened close inputStream 请求报文"+ request+ e);}}if (outputStream != null) {try {outputStream.close();} catch (IOException e) {System.out.println("error happened close outputStream 请求报文"+ request+ e);}}httpURLConnection.disconnect();}System.out.println("响应报文" + result);return result;}
}

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