1 public class FileImage {
 2     private File file;
 3     private String contentType;
 4     private String filename;
 5
 6     public File getFile() {
 7         return file;
 8     }
 9
10     public String getContentType() {
11         return contentType;
12     }
13
14     public String getFilename() {
15         return filename;
16     }
17
18     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
19         this.file = file;
20     }
21
22     public void setUploadContentType(String contentType) {
23         this.contentType = contentType;
24     }
25
26     public void setUploadFileName(String filename) {
27         this.filename = filename;
28     }
29 }

 1 //文件上传工具类接口
 2 public interface FileUpload {
 3
 4     //实现文件上传的功能，返回上传后新的文件名称
 5     public abstract String uploadFile(FileImage fileImage);
 6
 7 }
 8
 9 //文件上传工具类具体实现
10 @Component("fileUpload")
11 public class FileUploadUtil implements FileUpload {
12
13     private String filePath;
14     @Value("#{prop.filePath}")
15     //@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
16     public void setFilePath(String filePath) {
17         System.out.println(filePath);
18         this.filePath = filePath;
19     }
20
21     //1. 通过文件名获取扩展名
22     private String getFileExt(String fileName) {
23         return FilenameUtils.getExtension(fileName);
24     }
25
26     //2. 生成UUID随机数，作为新的文件名
27     private String newFileName(String fileName) {
28         String ext = getFileExt(fileName);
29         return UUID.randomUUID().toString() + "." + ext;
30     }
31
32     //实现文件上传的功能，返回上传后新的文件名称
33     @Override
34     public String uploadFile(FileImage fileImage) {
35         //获取新唯一文件名
36         String pic = newFileName(fileImage.getFilename());
37         try {
38             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
39             return pic;
40         } catch (Exception e) {
41             throw new RuntimeException(e);
42         } finally {
43             fileImage.getFile().delete();
44         }
45     }
46 }

 1 @Controller("baseAction")
 2 @Scope("prototype")
 3 public class BaseAction<T> extends ActionSupport implements RequestAware,SessionAware,ApplicationAware,ModelDriven<T> {
 4
 5     //封装了图片信息的类
 6     protected FileImage fileImage;
 7
 8     //上传文件工具类
 9     @Resource
10     protected FileUpload fileUpload;
11
12     public FileImage getFileImage() {
13         return fileImage;
14     }
15     public void setFileImage(FileImage fileImage) {
16         this.fileImage = fileImage;
17     }
18     //省略其他无关代码……
19 }

 1 @Controller("productAction")
 2 @Scope("prototype")
 3 public class ProductAction extends BaseAction<Product> {
 4
 5         //省略其他无关代码……
 6
 7     public void save() throws Exception {
 8         //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
 9         String pic = fileUpload.uploadFile(fileImage);
10
11         model.setPic(pic);
12         model.setDate(new Date());
13         System.out.println(model);
14         //商品信息入库
15         productService.save(model);
16     }
17
18     public void update() {
19         String pic = fileUpload.uploadFile(fileImage);
20         model.setPic(pic);
21         model.setDate(new Date());
22         System.out.println(model);
23         //更新商品
24         productService.update(model);
25     }
26 }