spring mvc的图片上传与显示

来源：互联网发布：乐安全软件编辑：程序博客网时间：2024/04/29 06:21

upload.jsp：

<body>

<form action="/testAnnotationMVC_fileUpload/file/fileUpload2.jspx"

method="post" enctype="multipart/form-data">

<input type="file" name="file" />

<input type="submit" value="上传" />

</form>

<img alt="暂无图片" src="${fileUrl}" />

</body>

fileUpload() --- 文件上传的出的处理类

@Controller

@RequestMapping("/file")

public class fileUploadController {

@RequestMapping("/toFile")

//跳转到文件上传的JSP页面

public String toFileUpload() {

return "fileUpload";

}

@RequestMapping("/fileUpload")

public String fileUpload(@RequestParam("file") CommonsMultipartFile file,

HttpServletRequest request, ModelMap model) {

//获得原始文件名

String fileName = file.getOriginalFilename();

System.out.println("fileName:"+ fileName);

//新文件名

String newFileName = UUID.randomUUID()+fileName;

//上传到什么地方

String path = "d:/upload/";

File f = new File(path);

if(!f.exists())f.mkdirs();

if(!file.isEmpty()){

try {

FileOutputStream fos = new FileOutputStream(path+newFileName);

InputStream in = file.getInputStream();

int b = 0;

while((b=in.read())!=-1){

fos.write(b);

}

fos.close();

in.close();

} catch (Exception e) {

e.printStackTrace();

}

System.out.println("imgurl:"+ path+newFileName);

//保存文件地址，用于JSP页面回显

model.addAttribute("fileUrl", path+newFileName);

return "fileUpload";

}
}

Spring通过对Servlet API的HttpServletRequest接口精选扩展，使其能够很好的处理文件上传。扩展后的接口名为：

org.springframework.web.multipart.MultipartHttpServletRequest

MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest)(request);

然后就能正常读取参数： mRequest.getParameter("xxx");

我们再在fileUploadController里新增一个fileUpload2的方法：

@RequestMapping("/fileUpload2")

public String fileUpload2(HttpServletRequest request,HttpServletResponse response) throws Exception{

CommonsMultipartResolver cmr = new CommonsMultipartResolver(request.getServletContext());

if(cmr.isMultipart(request)){

MultipartHttpServletRequest mRequest = (MultipartHttpServletRequest)(request);

Iterator<String> files = mRequest.getFileNames();

while(files.hasNext()){

MultipartFile mFile = mRequest.getFile(files.next());

if(mFile != null){

String fileName = UUID.randomUUID()+mFile.getOriginalFilename();

String path = "d:/upload/"+fileName;

File localFile = new File(path);

mFile.transferTo(localFile);

request.setAttribute("fileUrl", path);

}

return "fileUpload";

}

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