springMVC 显示图片问题

悬赏园豆：20 [已解决问题] 解决于 2016-07-20 17:39

功能是上传一个图片文件到服务器路径并根据路径打开文件

jsp代码如下：

<form action="${ctx}/file/oneUpload" method="post" enctype="multipart/form-data">
        <h3>hello</h3>
        <div class="control-group">
            文件：<input type="text" name="fileName"/>
            <input type="file" name="fileTest"/>
        </div>
        <div class="control-group">
            <input type="submit" value="上传"/>
        </div>
    </form>

处理的controller如下：

@RequestMapping("/file")
public class FileUploadController {

    @RequestMapping(value = "/oneUpload")
    public String oneUpload(@RequestParam("fileTest") MultipartFile fileTest,
                            HttpServletRequest request, ModelMap model) {

        String uploadUrl = request.getSession().getServletContext().getRealPath("/") + "upload/";
        String fileName = fileTest.getOriginalFilename();

        File dir = new File(uploadUrl);
        if (!dir.exists()) {
            dir.mkdirs();
        }
        System.out.println("上传文件到：" + uploadUrl + fileName);
        File targetFile = new File(uploadUrl + fileName);
        if (!targetFile.exists()) {
            try {
                targetFile.createNewFile();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        try {
            fileTest.transferTo(targetFile);
        } catch (IOException e) {
            e.printStackTrace();
        }
        return "redirect:http://localhost:8080/demo-test/upload/" + fileName;
    }
}