Java SSM 图片上传

青旅半醒 2022-05-15 03:53 249阅读 0赞

近期写到图片上传，就是将图片上传至服务器

该上传的方式为，前台将图片转成base64码 ，然后将数据流发送后台，然后我再进行base64解码，并且将图片上传至服务器

// DTO层

package com.hand.utils.uploads.dto;
    
    import java.util.List;
    
    /**Auto Generated By Hap Code Generator**/
    
    
    public class Upload {
    
        private String fileName;//文件名称
    
        private String imgStr;// 图片流
    
        private String[] imgListStr;// 批量上传
    
        private String jsonDataStr;
    
        public String getJsonDataStr() {
            return jsonDataStr;
        }
    
        public void setJsonDataStr(String jsonDataStr) {
            this.jsonDataStr = jsonDataStr;
        }
    
        public String getFileName() {
            return fileName;
        }
    
        public void setFileName(String fileName) {
            this.fileName = fileName;
        }
    
        public String getImgStr() {
            return imgStr;
        }
    
        public void setImgStr(String imgStr) {
            this.imgStr = imgStr;
        }
    
        public String[] getImgListStr() {
            imgListStr = this.getImgStr().split(",");
            return imgListStr;
        }
    
        public void setImgListStr(String[] imgListStr) {
            this.imgListStr = imgListStr;
        }
    }

// Controller 层

package com.hand.utils.uploads.controllers;
    
    import com.hand.hap.system.dto.ResponseData;
    import com.hand.utils.uploads.dto.Upload;
    import com.hand.utils.uploads.service.IUploadService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestMethod;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import javax.servlet.http.HttpServletRequest;
    
    @Controller
    public class UploadController{
    
        @Autowired
        private IUploadService service;
    
    
        @RequestMapping(value = "/app/upload/img",method = RequestMethod.POST)
        @ResponseBody
        public ResponseData appUploadImg(Upload dto, HttpServletRequest request) {
            /**
             *
             * 功能描述: app 上传图片
             *
             * @auther:lkj
             * @date:2018/7/26 下午4:40
             * @param:[dto, request]
             * @return:com.hand.hap.system.dto.ResponseData
             *
             */
            try {
                ResponseData responseData = service.appUploadImg(dto);
                return responseData;
            } catch (Exception e) {
                e.printStackTrace();
                ResponseData responseData = new ResponseData(false);
                responseData.setMessage(e.getMessage());
                return responseData;
            }
        }
    
    
    }

// IUploadService 层

package com.hand.utils.uploads.service;
    
    import com.hand.hap.system.dto.ResponseData;
    import com.hand.utils.uploads.dto.Upload;
    
    public interface IUploadService{
        /**
         *
         * 功能描述: APP 图片上传
         *
         * @auther:lkj
         * @date:2018/7/26 下午4:43
         * @param:
         * @return:
         *
         */
        ResponseData appUploadImg(Upload dto) throws Exception;
    }

// ServiceImpl 实现类

package com.hand.utils.uploads.service.impl;
    
    import com.hand.hap.system.dto.ResponseData;
    import com.hand.utils.components.mapper.UtilMapper;
    import com.hand.utils.uploads.dto.Upload;
    import com.hand.utils.uploads.service.IUploadService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    import org.springframework.transaction.annotation.Transactional;
    import sun.misc.BASE64Decoder;
    
    import java.io.*;
    import java.util.Date;
    import java.util.List;
    
    @Service
    @Transactional(rollbackFor = Exception.class)
    public class UploadServiceImpl implements IUploadService {
    
        @Autowired
        private UtilMapper utilMapper;
    
        @Override
        public ResponseData appUploadImg(Upload dto) throws Exception{
            /**
             *
             * 功能描述: App 图片上传
             *
             * @auther:lkj
             * @date:2018/7/26 下午4:43
             * @param:[dto]
             * @return:com.hand.hap.system.dto.ResponseData
             *
             */
            String fileName = dto.getFileName();// 文件夹名称
            String[] imgListStr = dto.getImgListStr();
            //拼接成完整的指定的文件路径名，创建新文件 
            //我的文件路径是配置的快码
            String sql = "SELECT T.PROFILE_VALUE FROM SYS_PROFILE_VALUE T WHERE ";
            sql += "T.PROFILE_ID = ( SELECT PROFILE_ID FROM sys_profile WHERE PROFILE_NAME = 'APP_UP_IMG_PATH' ) ";
            String mysql = utilMapper.mysql(sql);
            String filePath = mysql+"/"+fileName;
            File file = new File(filePath);
            if(!file.exists()){
                file.mkdirs();
            }
            for(int i=0;i<imgListStr.length;i++){
                // 获取时间戳
                long nowDate=(new Date().getTime());
                String filename=nowDate+".jpg";
                GenerateImage(imgListStr[i],filePath+"/"+filename);
            }
    
            return new ResponseData();
        }
        //解码
        public static boolean GenerateImage(String imgStr, String imgFilePath) throws IOException {
            // 对字节数组字符串进行Base64解码并生成图片
            if (imgStr == null) // 图像数据为空
                return false;
            BASE64Decoder decoder = new BASE64Decoder();
                // Base64解码
                byte[] bytes = decoder.decodeBuffer(imgStr);
                for (int i = 0; i < bytes.length; ++i) {
                    if (bytes[i] < 0) {// 调整异常数据
                        bytes[i] += 256;
                    }
                }
                // 生成jpeg图片
                OutputStream out = new FileOutputStream(imgFilePath);
                out.write(bytes);
                out.flush();
                out.close();
                return true;
    
        }
    }