[Java知识库]springboot 上传文件/图片到本地文件夹，利用nginx可以采用地址打开该文件

springboot 上传文件/图片到本地文件夹，利用nginx可以采用地址打开该文件

步骤：

一、下载nginx

打开nginx.conf 文件，配置nginx

启动nginx在nginx.exe文件所在的文件夹路径上直接cmd，输入nginx.exe即可启动nginx
注意：要是先启动了nginx，直接关了cmd窗口，你以为nginx关闭了，其实没有，这个时候如果修改了nginx.conf文件的内容，需要重新在nginx.exe所在的目录上输入cmd ，然后输入 nginx.exe -s reload即可！！！！

二、springboot 代码

1、application.yml

upload:
  path: G:\\yougong\\chery-file   # 文件保存的路径 和 nginx.conf 保持一致
  reUrl: localhost:8013 # nginx的访问ip和端口 和 nginx.conf 保持一致

2、读取yml文件的内容

@Configuration
public class UploadConfig {
    public static String path;
 
    public static String reUrl;
 
    @Value("${upload.path}")
    public void setPath(String path) {
        UploadConfig.path = path;
    }
 
    @Value("${upload.reUrl}")
    public void setReUrl(String reUrl) {
        UploadConfig.reUrl = reUrl;
    }
}

3、写一个文件工具类

package com.yougong.admin.utils;

import java.io.*;
import java.util.UUID;

public class FileUtils {

    /**
     * 写入文件 未分块上传
     * 采用MultipartFile接收上传文件并使用FileOutputStream写入文件
     *
     * @param target
     * @param src
     * @throws IOException
     */
    public static void write(String target, InputStream src) throws IOException {
        OutputStream os = new FileOutputStream(target);
        byte[] buf = new byte[1024];
        int len;
        while (-1 != (len = src.read(buf))) {
            os.write(buf, 0, len);
        }
        os.flush();
        os.close();
    }

    /**
     * 分块写入文件
     * 采用MultipartFile接收上传文件的分块文件，上传参数包括：size：文件大小，chunk:分块号，chunks:总分块数
     *
     * @param target
     * @param targetSize
     * @param src
     * @param srcSize
     * @param chunks
     * @param chunk
     * @throws IOException
     */
    public static void writeWithBlcok(String target, Long targetSize, InputStream src, Long srcSize, Integer chunks, Integer chunk) throws IOException {
        RandomAccessFile randomAccessFile = new RandomAccessFile(target, "rw");
        randomAccessFile.setLength(targetSize);
        if (chunk == chunks - 1) {
            randomAccessFile.seek(targetSize - srcSize);
        } else {
            randomAccessFile.seek(chunk * srcSize);
        }
        byte[] buf = new byte[1024];
        int len;
        while (-1 != (len = src.read(buf))) {
            randomAccessFile.write(buf, 0, len);
        }
        randomAccessFile.close();
    }

    /**
     * 生成随机文件名
     *
     * @return
     */
    public static String generateFileName() {
        return UUID.randomUUID().toString();
    }
}

4、controller层

package com.yougong.admin.controller;
import com.yougong.admin.config.UploadConfig;
import com.yougong.admin.service.FileService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;

@RestController
@RequestMapping("/file")
public class FileController {
    
    @Autowired
    private FileService fileService;

    @PostMapping("/upload")
    public String upload(MultipartFile file) throws IOException {

        String fileExt = this.getExtName(file.getOriginalFilename());

        String fileName = System.currentTimeMillis() + "." + fileExt;

        fileService.upload(file, fileName);
        String filePath = "/" + fileName;
        String url = UploadConfig.reUrl + filePath;
        System.out.println("返回地址:"+url);
        //一次性上传多张的时候最好加上这个
        //Thread.sleep(500);
        return url;
    }

    private String getExtName(String fileName) {
        String fullName = fileName.toLowerCase();
        int dotIndex = fullName.lastIndexOf(".");
        return dotIndex == -1 ? "" : fileName.substring(dotIndex + 1);
    }
}

5、service层：

package com.yougong.admin.service;

import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;

public interface FileService {
 
    void upload(MultipartFile file, String fileName) throws IOException;
}

实现类：

package com.yougong.admin.service.impl;

import cn.hutool.core.io.FileUtil;
import com.yougong.admin.config.UploadConfig;
import com.yougong.admin.service.FileService;
import com.yougong.admin.utils.FileUtils;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.IOException;

@Service
public class FileServiceImpl implements FileService {
    @Override
    public void upload(MultipartFile file, String fileName) throws IOException {
        System.out.println("UploadConfig.path + path:"+ UploadConfig.path );
        //创建目录
        FileUtil.mkdir(UploadConfig.path );
 
        String newPath = UploadConfig.path  + "\\"+fileName;

        FileUtils.write(newPath, file.getInputStream());
 
    }
}

6、测试：
postman发送文件进行测试：

网页查看：
成功！！！
文件夹查看：这个就是我们在nginx.conf文件里面配置的路径
成功！！！