public class FileImage { 
 private File file; 
 private String contentType; 
 private String filename; 
  
 public File getFile() { 
  return file; 
 } 
 
 public String getContentType() { 
  return contentType; 
 } 
 
 public String getFilename() { 
  return filename; 
 } 
 
 public void setUpload(File file) { //set方法可以不用和属性名一样，但是前台传进来时的参数得和set方法名相同。即前台传的参数为fileImage.upload 
  this.file = file; 
 } 
  
 public void setUploadContentType(String contentType) { 
  this.contentType = contentType; 
 } 
  
 public void setUploadFileName(String filename) { 
  this.filename = filename; 
 } 
} 

//文件上传工具类接口 
public interface FileUpload { 
 
 //实现文件上传的功能，返回上传后新的文件名称 
 public abstract String uploadFile(FileImage fileImage); 
 
} 
 
//文件上传工具类具体实现 
@Component("fileUpload") 
public class FileUploadUtil implements FileUpload { 
  
 private String filePath; 
 @Value("#{prop.filePath}") 
 //@Value表示去beans.xml文件中找id="prop"的bean，它是通过注解的方式读取properties配置文件的，然后去相应的配置文件中读取key=filePath的值 
 public void setFilePath(String filePath) { 
  System.out.println(filePath); 
  this.filePath = filePath; 
 } 
 
 //1. 通过文件名获取扩展名 
 private String getFileExt(String fileName) { 
  return FilenameUtils.getExtension(fileName); 
 } 
  
 //2. 生成UUID随机数，作为新的文件名 
 private String newFileName(String fileName) { 
  String ext = getFileExt(fileName); 
  return UUID.randomUUID().toString() + "." + ext; 
 } 
  
 //实现文件上传的功能，返回上传后新的文件名称 
 @Override 
 public String uploadFile(FileImage fileImage) { 
  //获取新唯一文件名 
  String pic = newFileName(fileImage.getFilename()); 
  try { 
   FileUtil.copyFile(fileImage.getFile(), new File(filePath, pic));//第一个参数是上传的文件，第二个参数是将文件拷贝到新路径下 
   return pic; 
  } catch (Exception e) { 
   throw new RuntimeException(e); 
  } finally { 
   fileImage.getFile().delete(); 
  } 
 } 
} 

@Controller("baseAction") 
@Scope("prototype") 
public class BaseAction<T> extends ActionSupport implements RequestAware,SessionAware,ApplicationAware,ModelDriven<T> { 
 
 //封装了图片信息的类 
 protected FileImage fileImage; 
  
 //上传文件工具类 
 @Resource 
 protected FileUpload fileUpload; 
 
 public FileImage getFileImage() { 
  return fileImage; 
 } 
 public void setFileImage(FileImage fileImage) { 
  this.fileImage = fileImage; 
 } 
 //省略其他无关代码…… 
} 

@Controller("productAction") 
@Scope("prototype") 
public class ProductAction extends BaseAction<Product> { 
 
  //省略其他无关代码…… 
  
 public void save() throws Exception { 
  //fileUpload工具类被抽取了，uploadFile方法直接接受一个fileImage对象，返回新的图片名 
  String pic = fileUpload.uploadFile(fileImage); 
   
  model.setPic(pic); 
  model.setDate(new Date()); 
  System.out.println(model); 
  //商品信息入库 
  productService.save(model); 
 } 
  
 public void update() { 
  String pic = fileUpload.uploadFile(fileImage); 
  model.setPic(pic); 
  model.setDate(new Date()); 
  System.out.println(model); 
  //更新商品 
  productService.update(model); 
 } 
}