java文件上传实例

UploadVideoController：

package com.lianshang.platform.controller;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.Date;

@Controller
public class UploadVideoController {
    //完整访问路径
    private String url;
    //访问路径前缀
    private String ip = "http://";

    //上传
    @RequestMapping(value = "/uploadFile", produces = "application/json;charset=UTF-8")
    @ResponseBody
    public String uploadFile(@RequestParam("fileName") MultipartFile file, HttpServletRequest request) {
        String host = request.getLocalAddr();
        Integer port =request.getLocalPort();
        System.out.print("服务器id"+host+"\n"+"端口号:"+port);

        System.out.print("上传文件===" + "\n");
        //判断文件是否为空
        if (file.isEmpty()) {
            return "上传文件不可为空";
        }
        // 获取文件名
        String fileName = file.getOriginalFilename();
        // System.out.print("上传的文件名为: "+fileName+"\n");
        fileName = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date()) + "_" + fileName;
        System.out.print("（加时间戳，尽量避免文件名称重复）保存的文件名为: " + fileName + "\n");
        //加个时间戳，尽量避免文件名称重复
       // System.getProperty("user.dir") 获取项目根路径
        String path =System.getProperty("user.dir")+"\\fileUpload\\" + fileName;
        //文件绝对路径
        System.out.print("保存文件绝对路径" + path + "\n");
        //创建文件路径
        File dest = new File(path);
        //判断文件是否已经存在
        if (dest.exists()) {
            return "文件已经存在";
        }
        //判断文件父目录是否存在
        if (!dest.getParentFile().exists()) {
            dest.getParentFile().mkdir();
        }
        InputStream inputStream=null;
        OutputStream outputStream=null;
        try {
            //上传文件
            inputStream = file.getInputStream();
            byte[] bytes = new byte[1024 * 5];
            outputStream = new FileOutputStream(dest);
            while (inputStream.read(bytes) != -1) {
                outputStream.write(bytes);
                outputStream.flush();
            }
            //拼接服务器地址
            url = ip+host+":"+port+"/"+path;
        } catch (IOException e) {
            e.printStackTrace();
            return "上传失败";
        }
        return "上传成功,文件url==" + url;
    }

}

WebConfig：

package com.lianshang.platform.config;

import com.lianshang.platform.annotation.AuthMethodArgumentResolver;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.web.servlet.MultipartConfigFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.GenericJackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.servlet.config.annotation.*;

import javax.servlet.MultipartConfigElement;
import java.util.List;

@Configuration
public class WebConfig implements WebMvcConfigurer
{

 /**
     * 在配置文件中配置的文件保存路径
     */
    @Value("file:/fileUpload/")
    private String mImagesPath;

    @Bean
    public MultipartConfigElement multipartConfigElement() {
        MultipartConfigFactory factory = new MultipartConfigFactory();
        //文件最大KB,MB
        factory.setMaxFileSize("1024MB");
        //设置总上传数据总大小
        factory.setMaxRequestSize("1024MB");
        return factory.createMultipartConfig();
    }
}