文件的上传

 1 import java.io.File;
 2 import java.util.HashMap;
 3 import java.util.List;
 4 import java.util.Map;
 5 
 6 import javax.servlet.http.HttpServletRequest;
 7 
 8 import org.apache.commons.fileupload.FileItem;
 9 import org.apache.commons.fileupload.disk.DiskFileItemFactory;
10 import org.apache.commons.fileupload.servlet.ServletFileUpload;
11 import org.apache.commons.io.FilenameUtils;
12 
13 public class MyFileUpload {
14 
15     public static Map<String,String[]> getFileUpload(HttpServletRequest request){
16         //1获取表单数据
17         //*1.1创建工厂类DiskFileItemFactory对象
18         DiskFileItemFactory factory = new DiskFileItemFactory();
19         //*1.2使用工厂创建解析对象
20         ServletFileUpload fileUpload = new ServletFileUpload(factory);
21         //*1.3使用解析器来解析request对象
22         //用于封装普通表单项的数据
23         Map<String, String[]> map = new  HashMap<String,String[]>();
24         
25         try {
26             List<FileItem> list = fileUpload.parseRequest(request);
27             for (FileItem item : list) {
28                 if(item.isFormField()){   
29                     //如果里面封装的是普通数据
30                     String name = item.getFieldName(); //字段名
31                     String value = item.getString("UTF-8"); //字段的值
32                     map.put(name,new String[]{value});
33                 }else{                    
34                     //里面是文件表单数据
35                     String filename = item.getName();//上传的文件名
36                     String extension = FilenameUtils.getExtension(filename);//文件的扩展名
37                     //上传的文件的扩展名不能是jsp和exe
38                     if(!(extension.equals("jsp")||extension.equals("exe"))){
39                         //创建目录
40                         File storeDir = new File(request.getServletContext().getRealPath("/WEB-INF/upload"));
41                         if(!storeDir.exists()){
42                             storeDir.mkdirs();  //目录不存在就创建目录
43                         }
44                         //处理文件名
45                         if(filename !=null&&(!"".equals(filename))){
46                             filename = FilenameUtils.getName(filename);
47                         }else{
48                             continue;
49                         }
50 
51                         //目录打散
52                         String childDir = makeChildDir(storeDir,filename);
53                         filename = childDir+File.separator+filename;
54                         //System.out.println(storeDir);                    
55                         try {
56                             item.write(new File(storeDir,filename));//！！！！！！！存储路径
57                             item.delete();
58                         } catch (Exception e) {
59                             e.printStackTrace();
60                         }
61                         map.put(item.getFieldName(), new String[]{filename});
62                     }
63                 }
64             }
65         } catch (Exception e) {
66             e.printStackTrace();
67         }
68         return map;
69     }
70     private static String makeChildDir(File storeDir, String filename) {
71         int hashcode = filename.hashCode(); //返回字符串转换的32位的hashcode码
72         String code = Integer.toHexString(hashcode);//把hashcode转换为16进制的字符
73 
74         String childDir = code.charAt(0)+File.separator+code.charAt(1);//  a/b
75         //创建指定目录
76         File file = new File(storeDir,childDir); //根据storeDir的路径创建一个新的childDir路径
77         if(!file.exists()){
78             file.mkdirs();
79         }
80         return childDir;
81     }
82 
83 }