必须添加jar包commons-fileupload.jar，commons-io-2.0.1.jar

<%@ page contentType="text/html; charset=UTF-8" %> 

<%@ taglib prefix="s" uri="/struts-tags" %> 
    <html> 
    <head> 
        <title>Struts2 File Upload</title> 
      
        <script language="javascript" type="text/javascript">
    function checked(){
       
        if (!/\.(mp3|WMA)$/.test(document.getElementById("upload").value)) { 
             alert("文件类型必须是.MP3.WMA中的一种");
            document.getElementById("upload").value = "";  
            return false;  
        }
    }
</script>
    </head> 
    <body>   
    <s:text name=""></s:text> 
        <form name="myform" action="fileUpload.action" method="post" enctype="multipart/form-data" οnsubmit="return checked();"> 
文件标题：<s:textfield name="title"></s:textfield><br>
选择文件：<s:file name="upload" id="upload"></s:file>
          <input type="submit" value="上传">       
        </form> 
    </body> 
    </html> 

*******************************************

package com.song.action;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStreamWriter;
import org.apache.commons.io.FileUtils;
public class UploadFileAction extends BaseAction {
    public static String FILESAVEPATH = "D:/Downloads";
    /**
     *
     */
    private static final long serialVersionUID = 1L;
    private String fileName;
   
    private String title;
    private File upload;
    @Override
    public String execute() throws Exception {
        String targetDirectory = FILESAVEPATH + File.separator;
        System.out.println("targetDirectory" + targetDirectory);
        System.out.println(fileName + "1111");
        File target = new File(targetDirectory, fileName);
        System.out.println("111111" + FILESAVEPATH + "/upload.txt");
        BufferedWriter bww = null;
        try {
            bww = new BufferedWriter(new OutputStreamWriter(
                    new FileOutputStream(FILESAVEPATH + "/upload.txt", true),
                    "UTF-8"));
            File file = new File(FILESAVEPATH + "/upload.txt");
            FileReader fr = new FileReader(file);
            BufferedReader br = new BufferedReader(fr);
            String str = br.readLine();
            System.out.println("str" + str);
            StringBuffer s = new StringBuffer();
            String song = fileName + title;
            System.out.println("song" + song);
            if (str == null || "".equals(str)) {
                s.append(fileName).append("-").append(title);
                bww.write(s.toString().trim());
                bww.newLine();
                bww.flush();
            } else if (!str.equals(song)) {
                s.append(fileName).append("-").append(title);
                bww.write(s.toString().trim());
                bww.newLine();
                bww.flush();
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            freeIO(bww);
        }
        FileUtils.copyFile(upload, target);
        return SUCCESS;
    }
   
   
    public void freeIO(BufferedWriter bww) {
        try {
            if (bww != null)
                bww.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    public String getTitle() {
        return title;
    }
    public File getUpload() {
        return upload;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public void setUpload(File upload) {
        this.upload = upload;
    }
    public void setUploadFileName(String fileName) {
        this.fileName = fileName;
    }
}

**************struts2.xml文件配置省略。。