SpringBoot文件上传, 上传到项目的相对路径上

偏执的太偏执、 2021-09-21 23:32 852阅读 0赞

### 目录 ###

*  1.准备工作
 *  2.文件上传代码

# 1.准备工作 #

1、新建一个SpringBoot项目加上web依赖, 所有依赖

<dependency>
    	<groupId>org.springframework.boot</groupId>
    	<artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    
    <dependency>
    	<groupId>org.thymeleaf</groupId>
    	<artifactId>thymeleaf-spring5</artifactId>
    </dependency>
    
    <dependency>
    	<groupId>org.springframework.boot</groupId>
    	<artifactId>spring-boot-starter-test</artifactId>
    	<scope>test</scope>
    </dependency>

2、application.properties

# 上传文件总的最大值
    spring.servlet.multipart.max-request-size=10MB
    #spring.servlet.multipart.max-request-size=10KB
    # 单个文件的最大值
    spring.servlet.multipart.max-file-size=10MB
    #spring.servlet.multipart.max-file-size=10KB
    
    # 文件上传路径
    pro.uploadPath=/uploadFile
    
    #spring.resources.static-locations = classpath:/META-INF/resources/,classpath:/resources/,classpath:/static/,classpath:/public/,classpath:/uploadFile/

3、新建文件上传的静态文件 `index.html`

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>文件上传</title>
    </head>
        <body>
            <h1>单文件上传</h1>
            <form method="post" action="/file/upload" enctype="multipart/form-data">
                <input type="file" name="file"><br>
                <input type="submit" value="提交">
            </form>
    
            <h1>传统手艺文件上传</h1>
            <form method="post" action="/upload" enctype="multipart/form-data">
                <input type="file" name="file"><br>
                <input type="submit" value="提交">
            </form>
    
            <h1>多文件上传</h1>
            <form method="post" action="/uploads" enctype="multipart/form-data">
                <input type="file" name="file"><br>
                <input type="file" name="file"><br>
                <input type="submit" value="提交">
            </form>
        </body>
    </html>

# 2.文件上传代码 #

package com.pro.controller;
    
    import org.springframework.beans.factory.annotation.Value;
    import org.springframework.util.ResourceUtils;
    import org.springframework.web.bind.annotation.*;
    import org.springframework.web.multipart.MultipartFile;
    import org.springframework.web.multipart.MultipartHttpServletRequest;
    
    import javax.servlet.http.HttpServletRequest;
    import java.io.*;
    import java.text.SimpleDateFormat;
    import java.util.*;
    
    @RestController
    public class UploadController { 
        @Value("${pro.uploadPath}")
        private String uploadPath;
    
        public final static String UPLOAD_PATH_PREFIX = "src/main/resources/static";
    
        /** * 获取文件路径 * @param request 请求体 * @param fileName 文件名称 * @return 文件路径 */
        public String getUploadPath(HttpServletRequest request, String fileName) { 
            return request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + uploadPath + "/" + fileName;
        }
    
        @GetMapping("/hello")
        public String hello(HttpServletRequest request) { 
            System.out.println("uploadPath --> " + uploadPath);
            System.out.println("上下文2 --> " + request.getServletContext().getRealPath("/file"));
    
            File file = new File(UPLOAD_PATH_PREFIX);
            System.out.println("UPLOAD_PATH_PREFIX 路径: " + file.getAbsoluteFile());
    
            try { 
                String path = ResourceUtils.getURL("classpath:").getPath();
                System.out.println("ResourceUtils.getURL.getPath --> " + path);
    
                System.out.println("当前项目的绝对路径 --> " + new File("").getAbsolutePath());
                System.out.println("upload 绝对路径 --> " + new File("upload").getAbsolutePath());
                System.out.println("/upload 绝对路径 --> " + new File("/upload").getAbsolutePath());
                System.out.println("./upload 绝对路径 --> " + new File("./upload").getAbsolutePath());
            } catch (FileNotFoundException e) { 
                e.printStackTrace();
            }
    
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
            String format = simpleDateFormat.format(new Date());
            return format;
        }
    
        // 单文件上传
        @RequestMapping("/file/upload")
        public Object fileUpload(@RequestParam("file") MultipartFile multipartFile, HttpServletRequest request) { 
            Map<String, Object> map = new HashMap();
            map.put("msg", "上传成功");
    
            if (multipartFile.isEmpty()) { 
                map.put("msg", "空文件");
                return map;
            }
    
            // 获取文件名
            String fileName = multipartFile.getOriginalFilename();
            if ("".equals(fileName)) { 
                map.put("msg", "文件名不能为空");
                return map;
            }
            System.out.println("上传文件原始的名字: " + fileName);
    
            // 使用uuid生成新文件名
            String newFileName = UUID.randomUUID().toString().replaceAll("-", "") + fileName.substring(fileName.lastIndexOf("."), fileName.length());
            System.out.println("保存的文件的新名字: " + newFileName);
    
            // 获取年月日的日期格式
            SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd");
            String format = simpleDateFormat.format(new Date());
    
            // 生成以日期分割的文件路径
            File readPath = new File(UPLOAD_PATH_PREFIX + uploadPath + File.separator + format);
            System.out.println("存放的文件夹: " + readPath);
            System.out.println("存放文件的绝对路径: " + readPath.getAbsolutePath());
            // 判断文件夹是否存在
            if (!readPath.isDirectory()) { 
                // 创建文件夹
                readPath.mkdirs();
            }
    
            // 文件真实的保存路径
            File file = new File(readPath.getAbsolutePath() + File.separator + newFileName);
            try { 
                multipartFile.transferTo(file);
    
                // 获取存储路径
                String filePath = getUploadPath(request, format + "/" + newFileName);
                map.put("path", filePath);
            } catch (IOException e) { 
                e.printStackTrace();
                map.put("msg", "上传失败");
            }
    
            return map;
        }
    
        // 传统手艺
        @PostMapping("/upload")
        public Object upload(@RequestParam("file") MultipartFile multipartFile) { 
            Map<String, Object> map = new HashMap();
            map.put("msg", "上传成功");
    
            if (multipartFile.isEmpty()) { 
                return "文件不能为空";
            }
    
            String fileName = multipartFile.getOriginalFilename();
            if ("".equals(fileName)) { 
                return "文件名不能为空";
            }
            System.out.println("文件名: " + fileName);
    
            File readPath = new File(UPLOAD_PATH_PREFIX + uploadPath + File.separator + "temp");
            if (!readPath.isDirectory()) { 
                readPath.mkdirs();
            }
            System.out.println("保存路径: " + readPath);
    
            InputStream is = null;
            FileOutputStream os = null;
            try { 
                is = multipartFile.getInputStream();
                os = new FileOutputStream(new File(readPath, fileName));
    
                int len = 0;
                byte[] bytes = new byte[1024];
                while ((len = is.read(bytes)) != -1) { 
                    os.write(bytes, 0, len);
                }
            } catch (IOException e) { 
                e.printStackTrace();
                map.put("msg", "上传失败");
            } finally { 
                try { 
                    is.close();
                } catch (IOException e) { 
                    e.printStackTrace();
                }
                try { 
                    os.close();
                } catch (IOException e) { 
                    e.printStackTrace();
                }
            }
    
            return map;
        }
    
        // 多文件上传
        @PostMapping("/uploads")
        public String uploads(HttpServletRequest request) { 
            List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");
    
            for (MultipartFile file : files) { 
                if (file.isEmpty()) { 
                    return file.getOriginalFilename() + "上传失败";
                }
    
                File readPath = new File(UPLOAD_PATH_PREFIX + uploadPath + File.separator + "temps");
                System.out.println("多文件上传的位置: " + readPath);
                System.out.println("多文件上传的绝对路径: " + readPath.getAbsolutePath());
                if (!readPath.isDirectory()) { 
                    readPath.mkdirs();
                }
    
                File dest = new File(readPath.getAbsolutePath() + File.separator + file.getOriginalFilename());
                try { 
                    file.transferTo(dest);
                } catch (IOException e) { 
                    e.printStackTrace();
                    return file.getOriginalFilename() + "上传失败";
                }
            }
    
            return "上传成功";
        }
    }