java中獲取url路徑下文件MD5值的方法

獲取url路徑下的文件md5值，JAVA自帶的commons-codec包就提供了獲取16進制MD5值的方法。

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import org.apache.commons.codec.digest.DigestUtils;

public class Test {
	public static void main(String[] args) {
		InputStream inputStream = null; 
		try {
			//url路徑
			URL url=new URL("http://obs.jwy.szga/0266784f2acf448d862de250a04fc0b9/62ee75dc919b4841803add044909cc78.zip");
			//獲取連接
			HttpURLConnection connection=(HttpURLConnection)url.openConnection();
			connection.setConnectTimeout(3*1000);
			//設置請求頭
			connection.setRequestProperty("User-Agent","Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.110 Safari/537.36");
			
			inputStream = connection.getInputStream();
			//DigestUtils爲org.apache.commons.codec.digest.DigestUtils下的類
			String md5 = DigestUtils.md5Hex(inputStream);
			System.out.println(md5);
		} catch (IOException e) {
			e.printStackTrace();
		} finally{
			try {
				if (inputStream != null) {
					//關閉流
					inputStream.close();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
	}
}

文件md5在線計算：http://www.metools.info/other/o21.html