SpringBoot文件上传+拦截器

1、resource static下有个图片，希望浏览器可以查看这个图片

访问：

若yml设置路径，则可以定义在static下才可以访问

classpath代表类路径，都在target下

也就是项目在运行后的resource下的文件都会到classes下去

无需在target下创建文件夹。在resource下创建文件夹即可

spring.mvc.static-path-pattern=/static/**

spring.mvc.static-path-pattern=/static/**
spring.web.resources.static-locations=classpath:/css

2、文件上传13：00

package com.example.helloworld.controller;import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;/*** @Author Fxdll* @Date 2024/4/30 23:05* @PackageName:com.example.helloworld.controller* @ClassName: FileController* @Description: TODO* @Version 1.0*/
@RestController
public class FileUploadController {@PostMapping("/upload")//等价于@RmoteMapping(value="/uplaod",method=RequestMethod.POST)public String up(String nickname, MultipartFile photo, HttpServletRequest request) throws IOException {//获取前端传来的昵称System.out.println(nickname);//获取上传文件的路径System.out.println( "文件名"+ photo.getOriginalFilename());//获取上传文件的类型System.out.println(photo.getContentType());//        System.out.println(System.getProperty("user.dir"));//获取项目的路径String path = request.getServletContext().getRealPath("/upload/");//获取上传文件的真实路径System.out.println(path);//保存文件saveFile(photo,path);// TODO: 返回上传成功消息return "文件上传成功";}private void saveFile(MultipartFile photo,String path)throws IOException {
//判断路径是否存在，不存在则创建File Dir = new File(path);if (!Dir.exists()) {//创建目录Dir.mkdirs();}File file = new File(path + photo.getOriginalFilename());photo.transferTo(file);}
}

3、如何让上传的图片也可以访问？

配置静态路径即可

第一个是设置单词上传大小上线

第二个是访问图片静态路径设置

spring.servlet.multipart.max-file-size=10MB
spring.web.resources.static-locations=class:/upload/

4、拦截器

5、拦截器定义

package com.example.helloworld.config;import com.example.helloworld.interceptor.LoginInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;/*** @Author Fxdll* @Date 2024/5/3 21:33* @PackageName:com.example.helloworld.config* @ClassName: Webconfig* @Description: TODO* @Version 1.0*/
@Configuration
public class Webconfig implements WebMvcConfigurer {@Overridepublic void addInterceptors(InterceptorRegistry registry) {registry.addInterceptor(new LoginInterceptor()).addPathPatterns("/user/**");}
}

package com.example.helloworld.interceptor;import org.springframework.web.servlet.HandlerInterceptor;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*** @Author Fxdll* @Date 2024/4/30 22:31* @PackageName:com.example.helloworld.interceptor* @ClassName: LoginInterceptor* @Description: TODO 拦截器* @Version 1.0*//*** request:* 1.获取请求信息(客户端传来的cooke,url参数,请求体)* response:* 1.设置响应信息*/
public class LoginInterceptor  implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {System.out.println("LoginInterceptor");return true;}
}