java客户端文件的上传和下载

java客户端文件的上传和下载

//上传
    public JTable upload(String id){
        JTable table=new JTable();
        System.out.println("上传");
        JFileChooser fileChooser=new JFileChooser();
        fileChooser.setDialogTitle("文件上传");
        fileChooser.showOpenDialog(null);
        fileChooser.setVisible(true);
        String srcPath=fileChooser.getSelectedFile().getAbsolutePath();
        System.out.println(srcPath);

        String destFile="contract/"+id+".pdf";
        System.out.println(destFile);
        try{
            FileInputStream in=new FileInputStream(srcPath);
            FileOutputStream out=new FileOutputStream(destFile);
            byte[] buf=new byte[8*1024];
            int b;
            while((b=in.read(buf, 0, buf.length))!=-1){
                out.write(buf,0,b);
                out.flush();//最好加上
            }
            System.out.println("上传成功！！");
            in.close();
            out.close();
            //在数据库里更新
            //sql语句肯定是在这边传，因为这边是需求满足
            //直接在数据库里面改数据，在这边刷新数据就可以了
            JOptionPane.showMessageDialog(this,"上传成功");
            table=this.refresh();

        }
        catch (Exception ex3){
            ex3.printStackTrace();
        }
        return table;
    }

public JTable download(String id){
        System.out.println("下载");

        JTable table=new JTable();

        JFileChooser fileChooser=new JFileChooser();
        fileChooser.setDialogTitle("选择要存放下载文件的位置");
        fileChooser.showOpenDialog(null);
        fileChooser.setVisible(true);
        String destPath=fileChooser.getSelectedFile().getAbsolutePath();
        System.out.println(destPath);

        String endFileName=".pdf";
        if(!destPath.endsWith(endFileName)){
            destPath+=endFileName;
        }

        String srcFile="contract/"+id+".pdf";

        String destFile=destPath;
        System.out.println(destFile);
        try{
            FileInputStream in=new FileInputStream(srcFile);
            FileOutputStream out=new FileOutputStream(destFile);
            byte[] buf=new byte[8*1024];
            int b;
            while((b=in.read(buf, 0, buf.length))!=-1){
                out.write(buf,0,b);
                out.flush();//最好加上
            }
            System.out.println("下载成功！！");
            in.close();
            out.close();
            JOptionPane.showMessageDialog(this,"下载成功");
            //下载操作不需要连数据库不需要刷新
            table=this.refresh();
        }
        catch (Exception ex3){
            ex3.printStackTrace();
        }
        return table;
    }