struts2上传文件及多文件上传

1. struts2中的文件上传?
第一步：在WEB=INF/lib下加入commons-fileupload-1.2.1.jar ， commons-io-1.3.2.jar。?

第二步：把form表单的enctype属性设置为"multipart/form-data"，如?
?Java代码?

1. <form?action="${pageContext.request.contextPath}/control/employee/list_execute.action"?enctype="multipart/form-data"?method="post">??
2. ????文件:<input?type="file"?name="image">??
3. ????<input?type="submit"?value="上传"/>??
4. ??</form>??
5. ??//${pageContext.request.contextPath}：获取服务器根路径??

????
第三步：在action中添加一下属性，?
Java代码?

1. public?class?HelloWorldAction?{??
2. ????private?File?image;???????????//与jsp表单中的名称对应??
3. ????private?String?imageFileName;?//FileName为固定格式??
4. ????private?String?imageContentType?;//ContentType为固定格式??
5. ??????
6. ????public?String?getImageContentType()?{??
7. ????????return?imageContentType;??
8. ????}??
9. ????public?void?setImageContentType(String?imageContentType)?{??
10. ????????this.imageContentType?=?imageContentType;??
11. ????}??
12. ????public?String?getImageFileName()?{??
13. ????????return?imageFileName;??
14. ????}??
15. ????public?void?setImageFileName(String?imageFileName)?{??
16. ????????this.imageFileName?=?imageFileName;??
17. ????}??
18. ????public?File?getImage()?{??
19. ????????return?image;??
20. ????}??
21. ????public?void?setImage(File?image)?{??
22. ????????this.image?=?image;??
23. ????}??
24. ????public?String?execute()?throws?Exception{??
25. System.out.println("imageFileName?=?"+imageFileName);?????
26. System.out.println("imageContentType?=?"+imageContentType);??
27. ????????//获取服务器的根路径realpath??
28. ????????String?realpath?=?ServletActionContext.getServletContext().getRealPath("/images");??
29. System.out.println(realpath);??
30. ????????if(image!=null){??
31. ????????????File?savefile?=?new?File(new?File(realpath),?imageFileName);??
32. ????????????if(!savefile.getParentFile().exists())?savefile.getParentFile().mkdirs();??
33. ????????????FileUtils.copyFile(image,?savefile);??
34. ????????????ActionContext.getContext().put("message",?"上传成功");??
35. ????????}else{??
36. ????????????ActionContext.getContext().put("message",?"上传失败");??
37. ????????}??
38. ????????return?"success";??
39. ????}??
40. }??

???
此外，可以在struts.xml中配置上传文件的大小?
??? <constant name="struts.multipart.maxSize" value="10701096"/> //最大上传配置成10M?
??? 默认的上传大小为2M?

思维拓展：如果要上传的文件非常大，如上传的是电影，好几百M ，用web上传一般是不可能难上传成功的，这时候要安装一个插件，类似于应用程序?
????????? socket ，通过网络通讯上传。?

2 . 多文件上传?
??? 在上面的基础上略加改动?
??? 1.jsp表单?
?Java代码?

1. <form?action="${pageContext.request.contextPath}/control/employee/list_execute.action"?enctype="multipart/form-data"?method="post">??
2. ????文件1:<input?type="file"?name="image"><br/>??
3. ????文件2:<input?type="file"?name="image"><br/>??
4. ????文件3:<input?type="file"?name="image"><br/>??
5. ????<input?type="submit"?value="上传"/>??
6. ??</form>??

??? 2. action中用数组接收?
?Java代码?

1. ??public?class?HelloWorldAction?{??
2. ????private?File[]?image;??
3. ????private?String[]?imageFileName;??
4. ????private?String[]?imageContentType?;??
5. ????//省略了set和get方法??
6. ????public?String?execute()?throws?Exception{??
7. ??????????
8. ????????String?realpath?=?ServletActionContext.getServletContext().getRealPath("/images");??
9. ????????System.out.println(realpath);??
10. ????????if(image!=null){??
11. ????????????File?savedir?=?new?File(realpath);??
12. ????????????if(!savedir.exists())??
13. ???????????????{???
14. ??????????????????savedir.mkdirs();??
15. ???????????????}??
16. ????????System.out.println("image.length?=?"+image.length);??
17. ????????????for(int?i?=?0?;?i<image.length?;?i++){??
18. ??????????????????
19. System.out.println("imageContentType["+i+"]?=?"+imageContentType[i]);??
20. ????????????????File?savefile?=?new?File(savedir,?imageFileName[i]);??
21. ????????????????FileUtils.copyFile(image[i],?savefile);??
22. ????????????}??
23. ????????????ActionContext.getContext().put("message",?"上传成功");??
24. ????????}??
25. ????????return?"success";??
26. ????}??
27. } ?