spring boot用户注册上传头像并在及时页面上显示

package com.example.demo.control; import com.example.demo.dao.UserRepository; import com.example.demo.domain.User; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; import java.io.*; /** * Created by 18274 on 2017/8/9. */ @Controller public class Control { @Autowired UserRepository userRepository; @GetMapping(value="/zhuce") public String zhuce(){ return "zhuce"; } @PostMapping(value="/zhuce") public String tijiao(@RequestParam(value="name") String name, @RequestParam(value="password") String password, @RequestParam(value="file")MultipartFile file, Model model) { User user = new User(); user.setUsername(name); user.setPassword(password); if (!file.isEmpty()) { try { BufferedOutputStream out = new BufferedOutputStream( new FileOutputStream(new File("f:\\旗杯\\demo5\\src\\main\\webapp\\"+name+".jpg")));//保存图片到目录下 out.write(file.getBytes()); out.flush(); out.close(); String filename="f:\\旗杯\\demo5\\src\\main\\webapp\\"+name+".jpg"; user.setTupian(filename); userRepository.save(user);//增加用户 } catch (FileNotFoundException e) { e.printStackTrace(); return "上传失败," + e.getMessage(); } catch (IOException e) { e.printStackTrace(); return "上传失败," + e.getMessage(); } model.addAttribute(user); return "permanager"; } else { return "上传失败，因为文件是空的."; } } }