Java下载HTTP URL链接示例

这里以下载迅雷U享版为例。
示例代码：

package com.zifeiy.snowflake.handle.filesget;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class HttpFileGetter {
    
    public boolean download(String urlString, File localFile) {
        try {
            URL url = new URL(urlString);
            URLConnection connection = url.openConnection();
            connection.setConnectTimeout(5*1000);
            InputStream inputStream = connection.getInputStream();
            byte[] byteArr = new byte[1024];
            int len;
            File dir = localFile.getParentFile();
            if (dir.exists() == false) 
                dir.mkdirs();
            OutputStream outputStream = new FileOutputStream(localFile);
            while ((len = inputStream.read(byteArr)) != -1) {
                outputStream.write(byteArr, 0, len);
            }
            outputStream.close();
            inputStream.close();
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
        
        return true;
    }
    
    // main for test
    public static void main(String[] args) {
        HttpFileGetter httpFileGetter = new HttpFileGetter();
        httpFileGetter.download("http://down.sandai.net/ThunderVIP/ThunderVIP-xlgw.exe", new File("D:\\test_download.exe"));
    }
}

下载下来的程序运行也没有问题：