先来没事发下一些工具类

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;

public class DownloadFiles {
	
	//文件打包下载
	public static HttpServletResponse downLoadFiles(List<File> files, HttpServletRequest request, HttpServletResponse response) throws Exception {
    	try {
            //创建一个临时压缩文件，把文件流全部注入到这个文件中
        	SimpleDateFormat dateformate = new SimpleDateFormat("yyyyMMddhhmmss");
        	String name = dateformate.format(new Date()) + ".zip";
        	File file = new File("E:/"+name);
            if (!file.exists()){  
                file.createNewFile();  
            }
            response.reset();
            
            //创建文件输出流
            FileOutputStream fous = new FileOutputStream(file);  
            
             //打包的方法我们会用到ZipOutputStream这样一个输出流,所以这里我们把输出流转换一下
            //org.apache.tools.zip.ZipOutputStream
            ZipOutputStream zipOut = new ZipOutputStream(fous);
            //这个方法接受的就是一个所要打包文件的集合，
           	zipFile(files, zipOut);
           	zipOut.close();
           	fous.close();
           	return downloadZip(file,response);
        }catch (Exception e) {
        	e.printStackTrace();
        }
        
        /**
         * 直到文件的打包已经成功了，
         * 文件的打包过程被我封装在FileUtil.zipFile这个静态方法中，
         * 稍后会呈现出来，接下来的就是往客户端写数据了
         */
        return response ;
    }
    
    /**
     * 把接受的全部文件打成压缩包
     */
    public static void zipFile(List files, ZipOutputStream outputStream) {
        int size = files.size();
        for(int i = 0; i < size; i++) {
            File file = (File) files.get(i);
            zipFile(file, outputStream);
        }
    }
    
    public static HttpServletResponse downloadZip(File file, HttpServletResponse response) {
        try {
	        // 以流的形式下载文件。
	        InputStream fis = new BufferedInputStream(new FileInputStream(file.getPath()));
	        byte[] buffer = new byte[fis.available()];
	        fis.read(buffer);
	        fis.close();
	        // 清空response
	        response.reset();
	        
	        OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
	        response.setContentType("application/octet-stream");
	        response.setHeader("Content-Disposition", "attachment; filename=" + new String(file.getName().getBytes("GBK"),"ISO-8859-1")); 
	        
	        toClient.write(buffer);
	        toClient.flush();
	        toClient.close();
        } catch (IOException ex) {
        	ex.printStackTrace();
        }finally{
        	try {
        		File f = new File(file.getPath());
                f.delete();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return response;
    }
    
    /** 
     * 根据输入的文件与输出流对文件进行打包
     * @param org.apache.tools.zip.ZipOutputStream
     */
    public static void zipFile(File inputFile, ZipOutputStream ouputStream) {
        try {
            if(inputFile.exists()) {
                 // 如果是目录的话这里是不采取操作的，
                if (inputFile.isFile()) {
                    FileInputStream IN = new FileInputStream(inputFile);
                    BufferedInputStream bins = new BufferedInputStream(IN, 512);
                    //org.apache.tools.zip.ZipEntry
                    ZipEntry entry = new ZipEntry(inputFile.getName());
                    ouputStream.putNextEntry(entry);
                    // 向压缩文件中输出数据  
                    int nNumber;
                    byte[] buffer = new byte[1024];
                    while ((nNumber = bins.read(buffer)) != -1) {
                        ouputStream.write(buffer, 0, nNumber);
                    }
                    // 关闭创建的流对象  
                    bins.close();
                    IN.close();
                } else {
                    try {
                        File[] files = inputFile.listFiles();
                        for (int i = 0; i < files.length; i++) {
                            zipFile(files[i], ouputStream);
                        }
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

}