修改图片

[java]代码库

/**
	 *
	 * 修改
	 * @throws Exception 
	 * @throws Exception 
	 * 
	 */
	
	//带图片的增删改查
	//删除原来的图片 
	//上传新图片
	//不修改原来图片获取原来图片
	public String update() throws Exception  {
		File file = this.getFile();
		if(file != null && !("").equals(toGongQiuShangJiaXinXi.getGimge()) ) {  //如果不存在（没有改变） 获取原来图片的路径
			String oldpath  = ServletActionContext.getServletContext().getRealPath("/upload/");
			System.out.println(oldpath);
			File oldImageFile = new File(oldpath + File.separator + toGongQiuShangJiaXinXi.getGimge());
			if (oldImageFile.exists()) {
				oldImageFile.delete();
			}
			ServletActionContext.getRequest().setCharacterEncoding("UTF-8");
			String newpath = ServletActionContext.getServletContext().getRealPath("upload/"+ fileFileName);
			System.out.println(newpath);
			FileOutputStream fos = new FileOutputStream(newpath);
			FileInputStream fis = new FileInputStream(file);
			byte[] butter = new byte[1024];
			int len = 0;
			while ((len = fis.read(butter))!= -1) {
				fos.write(butter,0,len);
			}
			fos.close();
			fis.close();
			toGongQiuShangJiaXinXi.setGimge(fileFileName);
		} else {
			if (toGongQiuShangJiaXinXi.getGimge().equals(1)) {
				ServletActionContext.getRequest().setCharacterEncoding("UTF-8");
				//图片没有修改时，输入框中的值为NULL，获取原来图片的地址在上传
				String path = ServletActionContext.getServletContext().getRealPath("upload/"+ toGongQiuShangJiaXinXi.getGimge());
				System.out.println(path);
				FileOutputStream fos = new FileOutputStream(path);
				FileInputStream fis = new FileInputStream(file);
				byte[] butter = new byte[1024];
				int len = 0;
				while ((len = fis.read(butter))!= -1) {
					fos.write(butter,0,len);
				}
				fos.close();
				fis.close();
				toGongQiuShangJiaXinXi.setGimge(fileFileName);
			} else {
				System.out.println("图片不能为空！！！");
			}
		}
		toGongQiuShangJiaXinXiService.update(toGongQiuShangJiaXinXi);
		return "update";
		}