springboot的图片上传和下载

怼烎@ 2022-05-17 07:52 233阅读 0赞

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][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<String, Object> 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<byte[]> 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<byte[]> response = new ResponseEntity<byte[]>(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

[http_localhost_8080_image_4c8c8c96-6653-4e5a-acdf-d20efa392c05.jpg]: http://localhost:8080/image/4c8c8c96-6653-4e5a-acdf-d20efa392c05.jpg