文件上传（spring+struts+jquery）

最近实现了文件上传的功能，是基于spring +struts+jquery实现的。

需要注意的是 前台要引用jquery的 ajaxfileupload.js 文件。

 

具体伪代码如下:

1,控制层. 

我们提供了一个基类定义了一个文件上传的基本设置，比如控键名和上传路径等，如何想要特别处理，需要子类继承 UploadFileCallback，实现callback 方法。

 下面代码是我整合后的基类和实现类在一起后的效果。

public class UploadAction extends ActionSupport implements Preparable, ModelDriven, UploadFileCallback{
public static String UPLOADFRONTENDBASEPATH = "/home/upload";

    static {
    //the path of upload file	
    UPLOADFRONTENDBASEPATH = SettingManager.getInstance().getConfig().getString("uploadfrontEndBasePath");
    }

    private File[]       uploadFile;
    
    private String[]     uploadFileFileName;
    
    private static final String[] imageSuffix = {".jpg",".JPG",".jpeg",".JPEG",".gif",".GIF",".png",".PNG",".bmp",".BMP",".ico",".ICO"}; 
    
  
    public String[] processUploadFile() {
		if (uploadFile != null) {
			String suffix = uploadFileFileName[0].substring(uploadFileFileName[0].lastIndexOf("."));
			Arrays.sort(imageSuffix);
			int result = Arrays.binarySearch(imageSuffix, suffix); // 在数组中搜索是否含有该后缀名
			if (result < 0) {	// 如果不包含，返回特殊值
				return new String[] { "FORMAT_ERROR" };
			}
			int fileCounts = uploadFile.length;
			logger.debug("UploadFile counts :" + fileCounts);
			// 按照File[]的长度初始化一个用于返回文件上传结果的String数组,这个数组的元素与File[]的元素一一对应
			String[] uploadFileResult = new String[fileCounts];
			// 判断子类是否实现了UploadFileCallback接口,如果实现了该接口,文件处理逻辑移交到子类实现.
			if (this instanceof UploadFileCallback) {
				UploadFileCallback callback = (UploadFileCallback) this;
				for (int i = 0; i < this.uploadFile.length; i++) {
					uploadFileResult[i] = callback.callback(this.uploadFile[i], this.uploadFileFileName[i]);
				}
			} else { // 子类没有实现UploadFileCallback接口,采用默认的文件处理方式:将上传的文件保存到应用的files目录中.
				String appDir = this.getRequest().getSession()
						.getServletContext()
						.getRealPath(DEFAULT_UPLOAD_FILE_DIR)
						+ File.separator;
				File dir = new File(appDir);
				if (!dir.exists()) {
					dir.mkdir();
				}
				for (int i = 0; i < this.uploadFile.length; i++) {
					String filePath = appDir + this.uploadFileFileName[i];
					try {
						// 把临时文件复制到目标路径下
						FileUtils.copyFile(this.uploadFile[i], new File(
								filePath));
						// 文件地址作为上传结果返回
						uploadFileResult[i] = filePath;
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			}
			return uploadFileResult;
		} else {
			return null;
		}
    }
    
    public File[] getUploadFile() {
        return uploadFile;
    }
    
    public void setUploadFile(File[] uploadFile) {
        this.uploadFile = uploadFile;
    }
    
    public String[] getUploadFileFileName() {
        return uploadFileFileName;
    }
    
    public void setUploadFileFileName(String[] uploadFileFileName) {
        this.uploadFileFileName = uploadFileFileName;
    }

/**
	 * 图片上传回调函数
	 */
	@Override
	public String callback(File uploadFile, String uploadFileFileName) {
		String suffix = uploadFileFileName.substring(uploadFileFileName.lastIndexOf("."));
		uploadFileFileName =generateFileName(suffix);
		
		//BACK GROUND
		String appDir = getFeedbackPath(BASEPATH);
		String filePath = appDir + uploadFileFileName;
		File old = new File(filePath);
		if(old.exists()){
			old.delete();
		}

		
		try {
			// 把临时文件复制到目标路径下（同时备份）
			FileUtils.copyFile(uploadFile,new File(URLDecoder.decode(filePath, "UTF-8")));
			
			//如果前后台部署在二个tomcat下面，那么图片则同时复制一份。
			if(!UPLOADFRONTENDBASEPATH.equals(BASEPATH)){
				//FRONT END
				String frontDir = getFeedbackPath(UPLOADFRONTENDBASEPATH);
				String frontFilePath = frontDir + uploadFileFileName;
				File frontOld = new File(frontFilePath);
				if(frontOld.exists()){
					frontOld.delete();
				}
				
				// 把临时文件复制到目标路径下（同时备份）
				FileUtils.copyFile(uploadFile,new File(URLDecoder.decode(frontFilePath, "UTF-8")));
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		return uploadFileFileName;
	}
    
	// 存放图片地址
	public String getFeedbackPath(String basepath) {
		String realPath = basepath + File.separator+"feedbackPic" + File.separator;
		File dir = new File(realPath);
		if (!dir.exists()) {
			dir.mkdir();
		}
		return realPath;
	}
	
	private String generateFileName(String fileName) {
		DateFormat format = new SimpleDateFormat("yyMMddHHmmss");
		String formatDate = format.format(new Date());
		int random = new Random().nextInt(10000);
		int position = fileName.lastIndexOf(".");
		String extension = fileName.substring(position);
		return formatDate + random + extension;
	}

	/**
	 * 
	 * @return
	 */
	public String ajaxUploadFiles(){
		Map<String, Object> result = new HashMap<String, Object>();
    	String[] files= processUploadFile();
    	
    	if(files != null && files.length>0){
    		if("FORMAT_ERROR".equals(files[0])){
    			result.put("isSuccess", false);
    		}else{
    	    	result.put("filePath", files[0]);
    	    	result.put("isSuccess", true);
    		}
    		
    	}
    	
    	this.getRequest().setAttribute(GsonResult.GSON_RESULT_OBJECT, result);
		
		return "ajax";
	}

}

 

2. jsp 界面

 我采用的是ajax处理图片上传。 上传控键名为uploadFile。

 

<!-- js reference-->
<script type="text/javascript" src="scripts/jquery/ajaxfileupload.js"></script>
<script type="text/javascript" src="scripts/jquery/jquery1.7.js"></script>


	<div>
			                            <a href="javascript:addImgAttachment();" id="staffInfo_add">
						                        <i class="ydicons ydicons-feedbackAttach"></i> 添加附件
						                </a>　
 <input class="" id="uploadFile" name="uploadFile" type="file" accept="image/*" onchange="uploaderImg();" style="display:none;">
</div>


<script type="text/javascript">
function uploaderImg() {
			$.ajaxFileUpload({
				url : "${ctx}/ss/ssAjax/Upload/ajaxUploadFiles.do", //上传文件的服务端
				secureuri : false, //是否启用安全提交
				dataType : "json", //数据类型  
				fileElementId : "uploadFile", //表示文件域ID
				success : function(data) {//提交成功后处理函数      html为返回值，status为执行的状态
					if (data.isSuccess) {
						//上传成功后处理
}
				},
				error : function(data, status, e) {//提交失败处理函数
					alert("上传失败！" + e);
				}
			});
		}
</script>