文件流的方式实现文件上传 

 1 private String treatFile(File file, int type,
 2             Remotecertapply remotecertapply)//要上传的对象
 3     {
 4         if (file == null)
 5             return "图片文件为空";
 6         if (file.length() > FILEMAXSIZE)
 7             return "图片文件过大";
 8 
 9         //输入流
10         InputStream is = null;
11 
12         //输出流
13         OutputStream os = null;
14         try
15         {
16             String ext;
17             is = new FileInputStream(file);
18 
19             //得到文件类型
20             FileType fileType = FileTypeJudge.getType(is);
21 
22             //判断文件格式
23             if (FileType.JPEG.equals(fileType))
24                 ext = ".jpg";
25             else if (FileType.PNG.equals(fileType))
26                 ext = ".png";
27             else
28                 ext = "图片文件不是JPG/PNG格式";
29             if (!ext.equals(".jpg") && !ext.equals(".png"))
30                 return ext;
31             // 获取ServletAction上下文对象，getServletContext()获取Servlet上下文对象，getRealPath("upload")获取upload的绝对路径
32             String root = ServletActionContext.getServletContext()
33                     .getRealPath("/remoteuserimages");
34 
35             //获得文件名
36             String fileName = user.getId() + "_" + type
37                     + System.currentTimeMillis() + ext;
38 
39             //定义了一个byte类型的数组，数组长度为1024,buffer，有利于较少内存碎片,超过这个值就会报溢出的异常
40             byte[] buffer = new byte[1024];
41             int length = 0;
42 
43             //关闭输入流
44             is.close();
45             is = new FileInputStream(file);
46             os = new FileOutputStream(new File(root, fileName));
47 
48             //循环读取文件
49             while (-1 != (length = is.read(buffer, 0, buffer.length)))
50                 os.write(buffer, 0, length);
51             //存储上传的文件
52             if (type == 1)
53                 remotecertapply.setOrgnaid_imagepath(fileName);
54             else if (type == 2)
55                 remotecertapply.setBusinessid_imagepath(fileName);
56             else if (type == 3)
57                 remotecertapply.setTaxno_imagepath(fileName);
58             else
59             {
60                 remotecertapply.setPersonid_imagepath(fileName);
61                 remotecertapply.setIdtype(0);
62             }
63 
64             return null;
65         }
66         catch (IOException e)
67         {
68             e.printStackTrace();
69             return "图片文件处理时发生IO错误";
70         }
71         finally
72         {
73             if (is != null)
74                 try
75                 {
76                     is.close();
77                 }
78                 catch (IOException e)
79                 {
80                 }
81             if (os != null)
82                 try
83                 {
84                     os.close();
85                 }
86                 catch (IOException e)
87                 {
88                 }
89         }
90     }

 

posted @ 2017-05-05 14:54  尽欢  阅读(7979)  评论(0)    收藏  举报