<s:form action="upload2.action" method="post" theme="simple" enctype="multipart/form-data">
<tr><td id="more">选择上传文件:<s:file name="file"></s:file><br><s:submit type="button" value="submit"/></td></tr>
</s:form>

 <package name="struts2" extends="struts-default"><action name="upload2"class="com.hloytax.wg.upload.UploadAction1"><result name="success">/success.jsp</result><interceptor-ref name="fileUpload"><param name="maximumSize">409600</param> //上传文件大小设置// <!--allowedTypes (可选) - 以逗号分割的contentType类型列表(例如text/html), <param name="contentType"> application/txt; </param>            <param name="allowedTypes"></param></interceptor-ref><interceptor-ref name="defaultStack"></interceptor-ref></action></package>

public class UploadAction1 extends ActionSupport {/*** */private static final long serialVersionUID = 1L;private File file;  //文件名称  private String fileFileName;  //文件类型  private String fileContentType;  //注意：文件名称和文件类型的名称前缀必须相同，  省略get set 方法 @Override  public String execute() throws Exception{     //获取需要上传文件的文件路径  File uploadFile=new File(ServletActionContext.getServletContext().getRealPath("uploadFile"));  //判断文件是否上传，如果上传的话将会创建该目录  if(!uploadFile.exists()){  uploadFile.mkdir(); //创建该目录
        }  /*//第一种文件上传的方法  //声明文件输入流，为输入流指定文件路径  FileInputStream input=new FileInputStream(file);  //获取输出流，获取文件的文件地址及名称  FileOutputStream out=new FileOutputStream(uploadFile + "\\" +fileFileName);  try{  byte[] b=new byte[1024];//每次写入的大小  int i=0;  while((i=input.read(b))>0){  out.write(b,0,i);  }  }catch(Exception e){  e.printStackTrace();  }finally{  input.close();  out.close();  }  *///第二种文件上传的方法  //FileUtils.copyFile(file,new File(uploadFile+"\\"+fileFileName));  // FileUtils.copyFile(file,new File(uploadFile,fileFileName));  // System.out.println(uploadFile);//第三种方法  BufferedReader bReader=new BufferedReader(new InputStreamReader(new FileInputStream(file)));  BufferedWriter bWriter=new BufferedWriter(new OutputStreamWriter(new FileOutputStream(uploadFile+"\\"+fileFileName)));  System.out.println(uploadFile);   try{  char[] str=new char[1024];  int i=0;  while((i=bReader.read(str))>0){  bWriter.write(str,0,i);   }  }catch(Exception e){  e.printStackTrace();  }finally{  bReader.close();  bWriter.close();  uploadFile.delete();  }  return SUCCESS;  }  

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"id="WebApp_ID" version="2.5"><filter><filter-name>struts2</filter-name><filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class></filter><filter-mapping><filter-name>struts2</filter-name><url-pattern>/*</url-pattern></filter-mapping>
</web-app>

private List<File> file;
private List<String> fileContentType;
private List<String> fileFileName;private String savePath;
省略get  set 方法   上传方法  参照单文件上传@Override    public String execute() throws Exception {        List<File> files= getFile();        if (files !=null) {                for (int i = 0; i < files.size(); i++) {                    FileOutputStream fos = new FileOutputStream(getSavePath() + "\\" + getFileFileName().get(i));                    //建立上传文件的输入流                    System.out.println(getSavePath());                    FileInputStream fis = new FileInputStream(files.get(i));

        byte[] buffer = new byte[1024];        int len = 0;        while ((len = fis.read(buffer)) > 0) {             fos.write(buffer, 0, len);         }         fis.close();         fos.close();     } }      return SUCCESS;

            }

    /**     * 返回上传文件保存的位置     *      * @return     * @throws Exception     */    public String getSavePath() throws Exception {        return ServletActionContext.getServletContext().getRealPath(savePath);    }    public void setSavePath(String savePath) {        this.savePath = savePath;    }