springboot实现上传图片并在页面上显示及遇到的问题小结

 
 



 姓名
 密码
 上传图片
 
 

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.";
 }
 }
}

 
 


用户名:

图片:

package com.example.demo.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
/**
 * Created by 18274 on 2017/8/9.
 */
@Configuration
public class MyWebAppConfigurer extends WebMvcConfigurerAdapter{
 @Override
 public void addResourceHandlers(ResourceHandlerRegistry registry) {
 registry.addResourceHandler("/src/main/webapp/**").addResourceLocations("classpath:/webapp/");
 super.addResourceHandlers(registry);
 }
}

package com.example.demo.domain;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
/**
 * Created by 18274 on 2017/8/9.
 */
@Entity
public class User {
 @Id
 @GeneratedValue
 private Long id;
 private String username;
 private String password;
 private String tupian;//图片地址
 public User(){}
 public Long getId() {
 return id;
 }
 public String getUsername() {
 return username;
 }
 public String getPassword() {
 return password;
 }
 public String getTupian() {
 return tupian;
 }
 public void setId(Long id) {
 this.id = id;
 }
 public void setUsername(String username) {
 this.username = username;
 }
 public void setPassword(String password) {
 this.password = password;
 }
 public void setTupian(String tupian) {
 this.tupian = tupian;
 }
}

package com.example.demo.dao;
import com.example.demo.domain.User;
import org.springframework.data.jpa.repository.JpaRepository;
/**
 * Created by 18274 on 2017/8/9.
 */
public interface UserRepository extends JpaRepository{
}