Struts文件上传机制

 action name="fileUp" class="FileUpload.FileUpload">
            result>/message.jspresult>
        action>

 1 package FileUpload;
 2 
 3 import java.io.File;
 4 import java.io.FileInputStream;
 5 import java.io.FileNotFoundException;
 6 import java.io.FileOutputStream;
 7 
 8 import javax.servlet.ServletContext;
 9 
10 import org.apache.struts2.ServletActionContext;
11 
12 import com.opensymphony.xwork2.ActionSupport;
13 
14 public class FileUpload  extends ActionSupport{
15 
16     private File fileName;
17     private String fileNameContentType;
18     private String fileNameFileName;
19     
20     public String execute() throws Exception{
21         
22         ServletContext servletContext = ServletActionContext.getServletContext();
23         String dir = servletContext.getRealPath("/files/"+fileNameFileName);
24         System.out.println(dir);

25         FileOutputStream outputStream = new FileOutputStream(dir);
26         FileInputStream inputStream = new FileInputStream(fileName);
27         byte[] buffer = new byte[1024];
28         int len = 0;
29 //        从此输入流中将最多 b.length 个字节的数据读入一个 byte 数组中.读入缓冲区的字节总数，如果因为已经到达文件末尾而没有更多的数据，则返回 -1。
30         while((len = inputStream.read(buffer))!=-1){
31 //            将指定 byte 数组中从偏移量 off 开始的 len 个字节写入此文件输出流。
32             outputStream.write(buffer, 0, len);
33         }
34         inputStream.close();
35         outputStream.close();

36         return SUCCESS;
37     }
38 
39     public File getFileName() {
40         return fileName;
41     }
42 
43     public void setFileName(File fileName) {
44         this.fileName = fileName;
45     }
46 
47     public String getFileNameContentType() {
48         return fileNameContentType;
49     }
50 
51     public void setFileNameContentType(String fileNameContentType) {
52         this.fileNameContentType = fileNameContentType;
53     }
54 
55     public String getFileNameFileName() {
56         return fileNameFileName;
57     }
58 
59     public void setFileNameFileName(String fileNameFileName) {
60         this.fileNameFileName = fileNameFileName;
61     }
62 
63 
64     
65 }

 1 DOCTYPE html>
 2 html>
 3 head>
 4 meta charset="UTF-8">
 5 title>Insert title heretitle>
 6 head>
 7 body>
 8 
 9 form action="/Struts2FileUpload/fileUp.action" method="post" enctype ="multipart/form-data">
10 
11 input type="file" name="fileName" >
12 input type="submit" value="提交">
13 form>
14 
15 body>
16 html>

 action name="fileUp" class="FileUpload.FileUpload">
            result>/message.jspresult>
 action>