JAVA从服务器下载文件根据Url把多文件打包成ZIP下载

注意：

1. String filename = new String(“xx.zip”.getBytes(“UTF-8”), “ISO8859-1”);包装zip文件名不发生乱码。 

2.一定要注意，否则会发生下载下来的压缩包无法解压。在给OutputStream 传值之前，一定要先把ZipOutputStream的流给关闭了

压缩文件代码工具类：

package com.ksource.core.util.CheckToPdf;

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

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class UrlFilesToZip {

    private static final Logger logger = LoggerFactory.getLogger(UrlFilesToZip.class);  

    //根据文件链接把文件下载下来并且转成字节码
    public byte[] getImageFromURL(String urlPath) {
        byte[] data = null;
        InputStream is = null;
        HttpURLConnection conn = null;
        try {
            URL url = new URL(urlPath);
            conn = (HttpURLConnection) url.openConnection();
            conn.setDoInput(true);
            // conn.setDoOutput(true);
            conn.setRequestMethod("GET");
            conn.setConnectTimeout(6000);
            is = conn.getInputStream();
            if (conn.getResponseCode() == 200) {
                data = readInputStream(is);
            } else {
                data = null;
            }
        } catch (MalformedURLException e) {
            logger.error("MalformedURLException", e);
        } catch (IOException e) {
            logger.error("IOException", e);
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
            } catch (IOException e) {
                logger.error("IOException", e);
            }
            conn.disconnect();
        }
        return data;
    }  

    public byte[] readInputStream(InputStream is) {
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        byte[] buffer = new byte[1024];
        int length = -1;
        try {
            while ((length = is.read(buffer)) != -1) {
                baos.write(buffer, 0, length);
            }
            baos.flush();
        } catch (IOException e) {
            logger.error("IOException", e);
        }
        byte[] data = baos.toByteArray();
        try {
            is.close();
            baos.close();
        } catch (IOException e) {
            logger.error("IOException", e);
        }
        return data;
    }
}

控制层代码：

public void filesdown(HttpServletResponse response){
    try {
            //String filename = new String("xx.zip".getBytes("UTF-8"), "ISO8859-1");//控制文件名编码
            String fileName = URLEncoder.encode("证据材料.zip","UTF-8");
　　　　　　  ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ZipOutputStream zos = new ZipOutputStream(bos);
            UrlFilesToZip s = new UrlFilesToZip();
            int idx = 1;
            for (String oneFile : urls) {
                zos.putNextEntry(new ZipEntry("profile" + idx);
                byte[] bytes = s.getImageFromURL(oneFile);
                zos.write(bytes, 0, bytes.length);
                zos.closeEntry();
                idx++;
            }
            zos.close();
            response.setContentType("application/force-download");// 设置强制下载不打开
            response.addHeader("Content-Disposition", "attachment;fileName=" + filename);// 设置文件名
            OutputStream os = response.getOutputStream();
            os.write(bos.toByteArray());
            os.close();
        } catch (FileNotFoundException ex) {
            logger.error("FileNotFoundException", ex);
        } catch (Exception ex) {
            logger.error("Exception", ex);
        }
    }
}