上传、下载

uploadAction

package com.power.web.action.kabp;
import java.io.File;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import com.power.util.FileOptUtil;
import com.power.web.action.base.AbstractBaseAction;

public class UploadAction extends AbstractBaseAction{
     private static final long serialVersionUID = 1L;
     private static final int BUFFER_SIZE = 16 * 1024;
     // 文件标题
     private String title;
     // 上传文件域对象
     private File userfile;
     // 上传文件名
     private String userfileFileName;
     // 上传文件类型
     private String userfileContentType;
     // 保存文件的目录路径(通过依赖注入)
     private String savePath;
     
    public String fileUpload(){
         //根据服务器的文件保存地址和原文件名创建目录文件全路径
        String dstPath = request.getSession().getServletContext().getRealPath("");
        try {
            userfileFileName = FileOptUtil.createFileName(userfileFileName);
        } catch (Exception e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }
        dstPath += "/uploadFiles/" + userfileFileName;
        /*System.out.println("上传的文件的类型:"+userfileFileName);
        System.out.println("上传的文件的类型："+ this.getUserfileContentType());*/
        File dstFile = new File(dstPath);
        copy(this.userfile, dstFile);
        try {
            response.getWriter().print("{success:true,filename:'"+userfileFileName+"'}");
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
    private void copy(File src, File dst) {
        InputStream in = null;
        OutputStream out = null;
        try {
            in = new BufferedInputStream(new FileInputStream(src), BUFFER_SIZE);
            out = new BufferedOutputStream(new FileOutputStream(dst),
                    BUFFER_SIZE);
            byte[] buffer = new byte[BUFFER_SIZE];
            int len = 0;
            while ((len = in.read(buffer)) > 0) {
                out.write(buffer, 0, len);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            if (null != in) {
                try {
                    in.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != out) {
                try {
                    out.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
    public File getUserfile() {
        return userfile;
    }
    public void setUserfile(File userfile) {
        this.userfile = userfile;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    
    public String getUserfileFileName() {
        return userfileFileName;
    }
    public void setUserfileFileName(String userfileFileName) {
        this.userfileFileName = userfileFileName;
    }
    
    public String getUserfileContentType() {
        return userfileContentType;
    }
    public void setUserfileContentType(String userfileContentType) {
        this.userfileContentType = userfileContentType;
    }
    public String getSavePath() {
        return savePath;
    }
    public void setSavePath(String savePath) {
        this.savePath = savePath;
    }
    
}

downAction

/**
     * 下载文件
     * @return
     */
    public String downloadFile() {
        response.setContentType(CONTENT_TYPE);
        // 得到下载文件的名字
        String filename = request.getParameter("filename");
        try {
            String basePath = request.getSession().getServletContext().getRealPath("");
            // 解决中文乱码问题
//            filename = new String(request.getParameter("filename").getBytes("iso-8859-1"), "gbk");
            // 创建file对象
            File file = new File(basePath +"M/uploadFiles/"+ filename);

            // 设置response的编码方式
            response.setContentType("application/x-msdownload");

            // 写明要下载的文件的大小
            response.setContentLength((int) file.length());

            // 设置附加文件名
            // response.setHeader("Content-Disposition","attachment;filename="+filename);

            // 解决中文乱码
            response.setHeader("Content-Disposition", "attachment;filename="
                    + new String(filename.getBytes("gbk"), "iso-8859-1"));

            // 读出文件到i/o流
            FileInputStream fis = new FileInputStream(file);
            BufferedInputStream buff = new BufferedInputStream(fis);

            byte[] b = new byte[1024];// 相当于我们的缓存

            long k = 0;// 该值用于计算当前实际下载了多少字节

            // 从response对象中得到输出流,准备下载
            OutputStream myout = response.getOutputStream();

            // 开始循环下载
            while (k < file.length()) {
                int j = buff.read(b, 0, 1024);
                k += j;
                // 将b中的数据写到客户端的内存
                myout.write(b, 0, j);
            }
            // 将写入到客户端的内存的数据,刷新到磁盘
            myout.flush();
        } catch (UnsupportedEncodingException e) {
//            e.printStackTrace();
        } catch (FileNotFoundException e) {
//            e.printStackTrace();
        } catch (IOException e) {
//            e.printStackTrace();
        }
        return null;
    }