基于spring boot的图片上传接口及生成32为数据库的id工具类

import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;

import java.util.ArrayList;
import java.util.List;

/**
 * 2019/8/4
 * 图片上传控制器
 */
@RestController
@RequestMapping("/client/image")
public class ImageUploadController {
    @Value("${basicsUploadPath}")
    String base;
    @PostMapping("/upload")
    public MsgResponse upload(@RequestParam MultipartFile images[]){

        File pFile = new File(base);
        if (!pFile.exists()) {
            pFile.mkdirs();
        }
        MsgResponse msgResponse=new MsgResponse();
        List<String> imageList = new ArrayList<>();
        //这里可以支持多文件上传
        if (images != null && images.length >= 1) {

            String f;
            String f1;
            try {
                for (MultipartFile file : images) {
                    String fileName = file.getOriginalFilename();
                   // System.out.println("---fileName"+fileName);
                    //判断是否有文件且是否为图片文件
                    if(fileName!=null && !"".equalsIgnoreCase(fileName.trim()) && isImageFile(fileName)) {
                        //创建输出文件对象
                        f1=IdGen.uuid()+ getFileType(fileName);
                        f=base + "/" + f1;
                       // System.out.println("f"+f+"\tgetFileType"+getFileType(fileName));
                            File outFile = new File(f);
                        //拷贝文件到输出文件对象
                        FileUtils.copyInputStreamToFile(file.getInputStream(), outFile);
                        imageList.add(f1);
                    }
                }
            } catch (Exception e) {
                return msgResponse.setMsg("上传图片失败!");
            }
            return  msgResponse.setSuccess(true).setMsg("图片上传成功").setData(imageList);
        }
        return msgResponse.setMsg("请选择图片");

    }

    /**
     * 判断文件是否为图片
     * @param fileName
     * @return
     */
    private Boolean isImageFile(String fileName) {
        String[] img_type = new String[]{".jpg", ".jpeg", ".png", ".gif", ".bmp","svg",".dib",".tif",".ico",
        ".tiff"};
        if (fileName == null) {
            return false;
        }
        fileName = fileName.toLowerCase();
        for (String type : img_type) {
            //endsWith() 方法用于测试字符串是否以指定的后缀结束。 参考 https://www.runoob.com/java/java-string-endswith.html
            if (fileName.endsWith(type)) {
                return true;
            }
        }
        return false;
    }

    /**
     *  获取文件的后缀名
     * @param fileName
     * @return
     */
    private String getFileType(String fileName) {
        if (fileName != null && fileName.indexOf(".") >= 0) {
            return fileName.substring(fileName.lastIndexOf("."), fileName.length());
        }
        return "";
    }



}

application.properties配置

文件上传配置

spring.servlet.multipart.enabled=true
spring.servlet.multipart.max-file-size=10MB
spring.servlet.multipart.max-request-size=100MB
spring.servlet.multipart.resolve-lazily=false

 

 

生成32位数据库id字段的工具类

import org.apache.shiro.session.Session;
import org.apache.shiro.session.mgt.eis.SessionIdGenerator;
import org.springframework.context.annotation.Lazy;
import org.springframework.stereotype.Service;

import java.io.Serializable;
import java.security.SecureRandom;
import java.util.UUID;

/**
 * 封装各种生成唯一性ID算法的工具类.
 * @author ThinkGem
 * @version 2013-01-15
 */
@Service
@Lazy(false)
public class IdGen implements SessionIdGenerator {

    private static SecureRandom random = new SecureRandom();
    
    /**
     * 封装JDK自带的UUID, 通过Random数字生成, 中间无-分割.
     */
    public static String uuid() {
        return UUID.randomUUID().toString().replaceAll("-", "");
    }
    
    /**
     * 使用SecureRandom随机生成Long. 
     */
    public static long randomLong() {
        return Math.abs(random.nextLong());
    }

    /**
     * 基于Base62编码的SecureRandom随机生成bytes.
     */
    public static String randomBase62(int length) {
        byte[] randomBytes = new byte[length];
        random.nextBytes(randomBytes);
        return Encodes.encodeBase62(randomBytes);
    }


    @Override
    public Serializable generateId(Session session) {
        return IdGen.uuid();
    }
    
    public static void main(String[] args) {
        System.out.println(IdGen.uuid());
        System.out.println(IdGen.uuid().length());
        for (int i=0; i<1000; i++){
            System.out.println(IdGen.randomLong() + "  " + IdGen.randomBase62(5));
        }
    }

}