03.java实现文件上传的工具类及xml配置

/*
 *@ClassName:FileUpLoad
 *@Author:Arvin_yuan
 *@Date:2020/3/1 20:55
 *@Description:TODO
 */

import org.apache.commons.io.IOUtils;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.UUID;

public class FileUpLoad {

    public static String upload(String parentPath, MultipartFile fileImage){

        //如果没有上传文件就为null
        if (fileImage == null) {
            return null;
        }
        InputStream is = null;
        String fileName = null;
        FileOutputStream os = null;
        try {
            //获取输入流
            is = fileImage.getInputStream();
            //获取文件名
            fileName = fileImage.getOriginalFilename();
            //文件名处理，加上一串随机数
            fileName = UUID.randomUUID().toString().replaceAll("-","") + fileName;
            //根据文件名和父路径获取文件
            File file = new File(parentPath, fileName);
            //获取输出流
            os = new FileOutputStream(new File(parentPath, fileName));
            //进行复制
            IOUtils.copy(is,os);
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                if (os != null) {
                    os.close();
                }
                if (is != null) {
                    is.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return  fileName;
    }
}

<!-- 定义文件上传解析器 -->
    <bean id="multipartResolver"       
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 设定默认编码 -->
        <property name="defaultEncoding" value="UTF-8"></property>
        <!-- 设定文件上传的最大值5MB，5*1024*1024 -->
        <property name="maxUploadSize" value="5242880"></property>
    </bean>