springboot的图片上传和下载

使用springboot项目获取的相对路径，图片的存取位置是：C:\Users\GongYiYang_PC\AppData\Local\Temp\undertow-docbase.6316589994069529914.8080

在C盘而且路径不安逸，希望存在项目的路径中并且将地址映射为服务器相对地址:

项目存放地址：D:/eclipse/workspace

希望将图片存放在：D:/eclipse/workspace/upload/

直接获取图片地址：http://localhost:8080/image/4c8c8c96-6653-4e5a-acdf-d20efa392c05.jpg

package com.gyy.demo.controller;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

@RestController
public class FileController {

	@Autowired
	private HttpServletRequest request;

	@RequestMapping(value = { "/file/upload" }, method = RequestMethod.POST)
	public void fileUpLoad(@RequestParam(value = "file", required = true) MultipartFile file)
			 {
		/* 获取项目路径 */
		String property = System.getProperty("user.dir");
		File file3 = new File(property);
		String filePath = file3.getParent() + File.separator + "upload";
		// 自定义的文件名称
		String trueFileName = UUID.randomUUID().toString();
		// 文件原名称
		String fileName = file.getOriginalFilename();
		// 文件类型
		String type = fileName.indexOf(".") != -1 ? fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length())
				: null;
		// 设置存放图片文件的路径
		String path = null == type ? filePath + File.separator + trueFileName
				: filePath + File.separator + trueFileName + "." + type;
		File file2 = new File(filePath);
		if (!file2.exists()) {
			file2.mkdirs();
		}
		// 转存文件到指定的路径
		try {
			file.transferTo(new File(path));
			Map resultMap = new HashMap<>();
			resultMap.put("path", null == type ? trueFileName : trueFileName + "." + type);
			System.out.println(resultMap);
		} catch (IllegalStateException | IOException e) {
			e.printStackTrace();
		}
	}

	@RequestMapping(value = { "/file/download" }, method = RequestMethod.GET)
	public ResponseEntity download(@RequestParam("filename") String fileName) throws IOException {
		String property = System.getProperty("user.dir");
		File file3 = new File(property);
		String filePath = file3.getParent() + File.separator + "upload" + File.separator + fileName;
		@SuppressWarnings("resource")
		InputStream in = new FileInputStream(new File(filePath));// 将该文件加入到输入流之中
		byte[] body = null;
		body = new byte[in.available()];// 返回下一次对此输入流调用的方法可以不受阻塞地从此输入流读取（或跳过）的估计剩余字节数
		in.read(body);// 读入到输入流里面

		fileName = new String(fileName.getBytes("gbk"), "iso8859-1");// 防止中文乱码
		HttpHeaders headers = new HttpHeaders();// 设置响应头
		headers.add("Content-Disposition", "attachment;filename=" + fileName);
		HttpStatus statusCode = HttpStatus.OK;// 设置响应吗
		ResponseEntity response = new ResponseEntity(body, headers, statusCode);
		return response;
	}
}

将图片地址映射为服务器相对路径：

package com.gyy.demo.config;

import java.io.File;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 * 图片绝对地址与虚拟地址映射
 */

@Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter {

	
	@Override
	public void addResourceHandlers(ResourceHandlerRegistry registry) {

		// 文件磁盘图片url 映射
		// 配置server虚拟路径，handler为前台访问的目录，locations为files相对应的本地路径
		String property = System.getProperty("user.dir");
		File file3 = new File(property);
		String filePath = file3.getParent()+File.separator+"upload"+File.separator;
		System.out.println(filePath);
		registry.addResourceHandler("/image/**").addResourceLocations("file:"+filePath);
	}

}

设置文件大小：

spring.http.multipart.maxFileSize: 10Mb
spring.http.multipart.maxRequestSize: 10Mb