blob文件的存儲和讀取

1、blob文件的存儲

1.實體類:

private byte[] newPhoto;//數據庫保存圖片

注意返回值類型爲字節數組，數據庫類型爲BLOB;

2.jsp頁面

<form:input path="filePhoto" htmlEscape="false" type="file"/>

3.controller文件

 MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
 MultipartFile multipartFile = multipartRequest.getFile("filePhoto");// 與前端設置的fileDataName屬性值一致     
 String filename = multipartFile.getOriginalFilename();// 文件名稱
 InputStream is = null;    
    try {
	   //讀取文件流   
	   is = multipartFile.getInputStream();      
	   byte[] bytes = FileCopyUtils.copyToByteArray(is);
	   user.setNewPhoto(bytes);
	} catch (Exception e) {
		// TODO: handle exception
	}

2、blob文件從數據庫的讀取

1.jsp頁面

<img alt="照片" src="${ctx}/sys/user/upAndReadImg?id=${user.id}" width="120" height="120">

2.controller文件

public String upAndReadImg(@RequestParam(value="id",required=true)String id,HttpServletResponse response){
	User user=UserUtils.get(id);
	if(user != null){
		byte[] bytes=user.getNewPhoto();
		ServletOutputStream out=null;
			try {
				if (bytes != null && bytes.length > 0) {
					out=response.getOutputStream();
					out.write(bytes);
					out.flush();
				  }
				} catch (IOException e) {
					e.printStackTrace();
				}
		}
		return null;
	}