近期寫到圖片上傳，就是將圖片上傳至伺服器

該上傳的方式為，前臺將圖片轉成base64碼 ，然後將資料流傳送後臺，然後我再進行base64解碼，並且將圖片上傳至伺服器

// DTO層

package com.hand.utils.uploads.dto;

import java.util.List;

/**Auto Generated By Hap Code Generator**/


public class Upload {

    private String fileName;//檔名稱

    private String imgStr;// 圖片流

    private String[] imgListStr;// 批量上傳

    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 層

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 上傳圖片
         *
         * @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 層

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 圖片上傳
     *
     * @auther:lkj
     * @date:2018/7/26 下午4:43
     * @param:
     * @return:
     *
     */
    ResponseData appUploadImg(Upload dto) throws Exception;
}

// ServiceImpl 實現類

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 圖片上傳
         *
         * @auther:lkj
         * @date:2018/7/26 下午4:43
         * @param:[dto]
         * @return:com.hand.hap.system.dto.ResponseData
         *
         */
        String fileName = dto.getFileName();// 資料夾名稱
        String[] imgListStr = dto.getImgListStr();
        //拼接成完整的指定的檔案路徑名，建立新檔案 
        //我的檔案路徑是配置的快碼
        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++){
            // 獲取時間戳
            long nowDate=(new Date().getTime());
            String filename=nowDate+".jpg";
            GenerateImage(imgListStr[i],filePath+"/"+filename);
        }

        return new ResponseData();
    }
    //解碼
    public static boolean GenerateImage(String imgStr, String imgFilePath) throws IOException {
        // 對位元組陣列字串進行Base64解碼並生成圖片
        if (imgStr == null) // 影象資料為空
            return false;
        BASE64Decoder decoder = new BASE64Decoder();
            // Base64解碼
            byte[] bytes = decoder.decodeBuffer(imgStr);
            for (int i = 0; i < bytes.length; ++i) {
                if (bytes[i] < 0) {// 調整異常資料
                    bytes[i] += 256;
                }
            }
            // 生成jpeg圖片
            OutputStream out = new FileOutputStream(imgFilePath);
            out.write(bytes);
            out.flush();
            out.close();
            return true;

    }
}