java文件下載

package com.common.util;import org.apache.log4j.Logger;import javax.servlet.http.HttpServletResponse;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.ByteArrayInputStream;import java.io.File;import java.io.FileInputStream;import java.io.InputStream;import java.io.OutputStream;import java.net.URLEncoder;import java.util.Map;import java.util.zip.ZipEntry;import java.util.zip.ZipOutputStream;public final class FileUtils {    private static final Logger logger = Logger.getLogger(FileUtils.class);    //文件下載    public void downLoadFile(HttpServletResponse response,String path) throws Exception {        logger.info("path:"+path);        File f = new File(path);        if (!f.exists()) {            response.sendError(404, "File not found!");            return;        }        String fileName = f.getName();        fileName = new String(fileName.getBytes("UTF-8"), "ISO-8859-1");        BufferedInputStream br = new BufferedInputStream(new FileInputStream(f));        byte[] buf = new byte[1024];        int len = 0;        response.reset();        response.setContentType("application/x-msdownload");        response.setHeader("Content-Disposition", "attachment; filename=" + fileName);        OutputStream out = response.getOutputStream();        while ((len = br.read(buf)) > 0){            out.write(buf, 0, len);        }        br.close();        out.close();    }    //下載壓縮包    public static void downloadZipFileByInputStream(HttpServletResponse response, Map<String,InputStream> map, String zipName) throws Exception{        response.setContentType("application/x-msdownload");        response.setHeader("content-disposition", "attachment;filename="+ URLEncoder.encode(zipName, "utf-8"));        ZipOutputStream zos = new ZipOutputStream(response.getOutputStream());        BufferedOutputStream bos = new BufferedOutputStream(zos);        for(Map.Entry<String, InputStream> entry : map.entrySet()){            String fileName = entry.getKey();            //每一個文件的文件名            InputStream inputStream = entry.getValue();  //每一個文件的輸入流            BufferedInputStream bis = new BufferedInputStream(inputStream);            zos.putNextEntry(new ZipEntry(fileName));            int len = 0;            byte[] buf = new byte[10 * 1024];            while( (len=bis.read(buf, 0, buf.length)) != -1){                bos.write(buf, 0, len);            }            bis.close();            bos.flush();        }        bos.close();    }    //下載壓縮包    public void downloadZipFileByByte(HttpServletResponse response, Map<String, byte[]> files, String zipName) throws Exception{        response.setContentType("application/x-msdownload");        response.setHeader("content-disposition", "attachment;filename="+URLEncoder.encode(zipName, "utf-8"));        ZipOutputStream zos = new ZipOutputStream(response.getOutputStream());        BufferedOutputStream bos = new BufferedOutputStream(zos);        for(Map.Entry<String, byte[]> entry : files.entrySet()){            String fileName = entry.getKey();   //每一個文件的文件名            byte[]    file = entry.getValue();  //每一個文件的字節            BufferedInputStream bis = new BufferedInputStream(new ByteArrayInputStream(file));            zos.putNextEntry(new ZipEntry(fileName));            int len = 0;            byte[] buf = new byte[10 * 1024];            while( (len=bis.read(buf, 0, buf.length)) != -1){                bos.write(buf, 0, len);            }            bis.close();            bos.flush();        }        bos.close();    }}