java客户端文件的上传和下载

 1 //上传
 2     public JTable upload(String id){
 3         JTable table=new JTable();
 4         System.out.println("上传");
 5         JFileChooser fileChooser=new JFileChooser();
 6         fileChooser.setDialogTitle("文件上传");
 7         fileChooser.showOpenDialog(null);
 8         fileChooser.setVisible(true);
 9         String srcPath=fileChooser.getSelectedFile().getAbsolutePath();
10         System.out.println(srcPath);
11 
12         String destFile="contract/"+id+".pdf";
13         System.out.println(destFile);
14         try{
15             FileInputStream in=new FileInputStream(srcPath);
16             FileOutputStream out=new FileOutputStream(destFile);
17             byte[] buf=new byte[8*1024];
18             int b;
19             while((b=in.read(buf, 0, buf.length))!=-1){
20                 out.write(buf,0,b);
21                 out.flush();//最好加上
22             }
23             System.out.println("上传成功！！");
24             in.close();
25             out.close();
26             //在数据库里更新
27             //sql语句肯定是在这边传，因为这边是需求满足
28             //直接在数据库里面改数据，在这边刷新数据就可以了
29             JOptionPane.showMessageDialog(this,"上传成功");
30             table=this.refresh();
31 
32         }
33         catch (Exception ex3){
34             ex3.printStackTrace();
35         }
36         return table;
37     }

上传

 1 public JTable download(String id){
 2         System.out.println("下载");
 3 
 4         JTable table=new JTable();
 5 
 6         JFileChooser fileChooser=new JFileChooser();
 7         fileChooser.setDialogTitle("选择要存放下载文件的位置");
 8         fileChooser.showOpenDialog(null);
 9         fileChooser.setVisible(true);
10         String destPath=fileChooser.getSelectedFile().getAbsolutePath();
11         System.out.println(destPath);
12 
13         String endFileName=".pdf";
14         if(!destPath.endsWith(endFileName)){
15             destPath+=endFileName;
16         }
17 
18         String srcFile="contract/"+id+".pdf";
19 
20         String destFile=destPath;
21         System.out.println(destFile);
22         try{
23             FileInputStream in=new FileInputStream(srcFile);
24             FileOutputStream out=new FileOutputStream(destFile);
25             byte[] buf=new byte[8*1024];
26             int b;
27             while((b=in.read(buf, 0, buf.length))!=-1){
28                 out.write(buf,0,b);
29                 out.flush();//最好加上
30             }
31             System.out.println("下载成功！！");
32             in.close();
33             out.close();
34             JOptionPane.showMessageDialog(this,"下载成功");
35             //下载操作不需要连数据库不需要刷新
36             table=this.refresh();
37         }
38         catch (Exception ex3){
39             ex3.printStackTrace();
40         }
41         return table;
42     }

下载