上传下载---图片|文件

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说明。此样例是把图片或者文件上传到数据库的blob或者clob字段里头进行存储

controller层

package com.site.biz.controller.common;

import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
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.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import com.gta.edu.sdk.common.dto.ResultData;
import com.site.api.attach.FileResult;
import com.site.api.attach.service.IAttachService;
import com.site.api.attach.vo.GovsAttachVo;
import com.site.biz.controller.BaseController;

import io.swagger.annotations.Api;
@Api("文件上传")
@Controller
@RequestMapping("/fileCommon")
public class FileCommonController extends BaseController {
    private static final Logger LOG = LogManager.getLogger(FileCommonController.class);
    @Autowired
    private IAttachService attachService;

    @RequestMapping(value="/upload", method = RequestMethod.POST)
    @ResponseBody
    public ResultData upload(@RequestParam("file") MultipartFile file) {
        ResultData rd = new ResultData();
        rd.setSuccess(false);
        String fileName = file.getOriginalFilename();
        try {
            FileResult fr = attachService.save(fileName, file.getBytes());
            if (fr.isResultFlag()) {
                rd.setSuccess(true);
                Map<String, String> map = new HashMap<String, String>();
                map.put("attachId", fr.getAttachId());
                rd.setData(map);
            } else {
                rd.setErrorMsg(fr.getFailedMsg());
            }
        } catch (IOException e) {
            LOG.error("", e);
            rd.setErrorMsg("文件上传异常");
        }
        return rd;
    }

    @RequestMapping(value = "/getImg", method = RequestMethod.GET)
    public void getImg(HttpServletRequest request, HttpServletResponse response){
        response.setDateHeader("Expires", 0);
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        response.setHeader("Pragma", "no-cache");
        response.setContentType("image/png");
        String attachId = request.getParameter("attachId");
        GovsAttachVo attach = attachService.queryAttach(attachId);
        if(LOG.isInfoEnabled()) {
            LOG.info("getimg.attachId={}", attachId);
        }
        if(attach != null && attach.getFileContent()!=null) {
            //String base64=Base64.encodeBase64String(attach.getFileContent());
            OutputStream os = null;
            try {
                os = response.getOutputStream();
                os.write(attach.getFileContent());
                os.flush();
            } catch (IOException e) {
                LOG.error("", e);
            }finally {
                if(os != null) {
                    try {
                        os.close();
                    } catch (IOException e) {
                        LOG.error("", e);
                    }
                }
            }
            
            
        }

    }
    @RequestMapping(value = "/download", method = RequestMethod.GET)
    public void download(HttpServletRequest request, HttpServletResponse response) {
        String attachId = request.getParameter("attachId");
        GovsAttachVo attach = attachService.queryAttach(attachId);
        if(LOG.isInfoEnabled()) {
            LOG.info("download.attachId={}", attachId);
        }
        if(attach != null && attach.getFileContent()!=null) {
            OutputStream os=null;
            response.setContentType("bin");
            response.reset();
            response.setContentType("application/ms-excel;charset=utf-8");
            response.setCharacterEncoding("UTF-8");
            response.addHeader("Cache-Control", "no-cache");
            String fileName = attach.getFileName();
            try {
                response.setHeader("Content-disposition", "attachment;filename="+URLEncoder.encode(fileName,"UTF-8"));
                os=response.getOutputStream();
                os.write(attach.getFileContent());
                os.flush();
            } catch (UnsupportedEncodingException e) {
                LOG.error("", e);
            } catch (IOException e) {
                LOG.error("", e);
            }finally {
                if(os != null) {
                    try {
                        os.close();
                    } catch (IOException e) {
                        LOG.error("", e);
                    }
                }
            }
            
        }
    }
}

server接口层

package com.site.api.attach.service;

import java.util.List;

import com.site.api.attach.FileResult;
import com.site.api.attach.vo.GovsAttachVo;

public interface IAttachService {
    /**
     * 保存附件，返回附件保存结果信息
     * @param fileName 附件文件名
     * @param fileContent 附件文件内容
     * @return
     */
    public FileResult save(String fileName,byte[]fileContent);
    /**
     * 保存附件，返回附件保存结果信息
     * @param fileName 附件文件名
     * @param fileContent 附件文件内容
     * @param realTable 关联的表名或模块名
     * @param realTableId 关联的表名主键id
     * @return
     */
    public FileResult save(String fileName,byte[]fileContent,String realTable,String realTableId);
    /**
     * 保存附件，返回附件保存结果信息
     * @param fileName 附件文件名
     * @param fileContent 附件文件内容
     * @param realTable 关联的表名或模块名
     * @param realTableId 关联的表名主键id
     * @param seq 附件序号
     * @return
     */
    public FileResult save(String fileName,byte[]fileContent,String realTable,String realTableId,int seq);
    /**
     * 根据附件id删除附件
     * @param attachId
     * @return
     */
    public boolean delete(String attachId);
    /**
     * 根据关联的表名或模块名和关联的表名主键id删除附件
     * @param realTable
     * @param realTableId
     * @return
     */
    public boolean delete(String realTable,String realTableId);
    /**
     *  根据关联的表名或模块名和关联的表名主键id查询附件
     * @param realTable
     * @param realTableId
     * @return
     */
    public List<GovsAttachVo> queryAttach(String realTable,String realTableId);
    /**
     * 根据附件id查询附件
     * @param attachId
     * @return
     */
    public GovsAttachVo queryAttach(String attachId);
    
}

server实现层

package com.site.biz.service.attach;

import java.util.List;
import java.util.Locale;

import org.apache.commons.lang3.StringUtils;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import com.common.core.DaoSeqUtils;
import com.common.core.FileTypeUtil;
import com.site.api.attach.FileResult;
import com.site.api.attach.bo.GovsAttachBo;
import com.site.api.attach.bo.GovsAttachRealBo;
import com.site.api.attach.dao.IGovsAttachDao;
import com.site.api.attach.dao.IGovsAttachRealDao;
import com.site.api.attach.service.IAttachService;
import com.site.api.attach.vo.GovsAttachVo;
import org.springframework.transaction.annotation.Transactional;

@Service
public class AttachServiceImpl implements IAttachService{
    private static final Logger LOG = LogManager.getLogger(AttachServiceImpl.class);
    @Autowired
    private IGovsAttachDao attachDao;
    @Autowired
    private IGovsAttachRealDao attachRealDao;
    @Override
    public FileResult save(String fileName, byte[] fileContent) {
        return save(fileName,fileContent,null,"0");
    }
    @Override
    public FileResult save(String fileName, byte[] fileContent, String realTable, String realTableId) {
        return save(fileName,fileContent,realTable,realTableId,1);
    }
    @Override
    @Transactional
    public boolean delete(String attachId) {
        attachDao.delete(attachId);
        attachRealDao.delete(attachId);
        return false;
    }
    @Override
    @Transactional
    public boolean delete(String realTable, String realTableId) {
        GovsAttachRealBo attach = new GovsAttachRealBo ();
        attach.setRealTable(getRealTable(realTable));
        attach.setRealTableId(realTableId);
        attachDao.delete(attach);
        attachRealDao.delete(attach);
        return false;
    }
    @Override
    public List<GovsAttachVo> queryAttach(String realTable, String realTableId) {
        GovsAttachRealBo attach = new GovsAttachRealBo ();
        attach.setRealTable(getRealTable(realTable));
        attach.setRealTableId(realTableId);
        return attachRealDao.queryAttach(attach);
    }
    @Override
    public GovsAttachVo queryAttach(String attachId) {
        return attachRealDao.queryAttach(attachId);
    }

    @Override
    @Transactional
    public FileResult save(String fileName, byte[] fileContent, String realTable, String realTableId, int seq) {
        FileResult fr = new FileResult();
        fr.setResultFlag(false);
        if(StringUtils.isEmpty(fileName)) {
            fr.setFailedMsg("文件名不能为空");
            return fr;
        }
        if(fileContent==null || fileContent.length==0) {
            fr.setFailedMsg("文件内容不能为空");
            return fr;
        }
        String type = FileTypeUtil.getFileType(fileContent);
        if(StringUtils.isEmpty(type)) {
            LOG.warn("fileName={},上传的文件类型非法", fileName);
            fr.setFailedMsg("["+fileName+"]为非法文件类型");
            return fr;
        }
        int index = fileName.lastIndexOf(".");
        if(index<=0||(index+1)==fileName.length()) {
            fr.setFailedMsg("["+fileName+"]非法的文件名称");
            return fr;
        }
        String fileNameType = fileName.substring(index+1);
        if(LOG.isInfoEnabled()) {
            LOG.info("fileName={},获取的实际文件后缀：{}",fileName,type);
        }
        if(!type.equals(fileNameType)) {
            fr.setFailedMsg("["+fileName+"]上传的文件类型被篡改");
            return fr;
        }
        fr.setResultFlag(true);
        GovsAttachBo att = new GovsAttachBo();
        att.setAttachId(DaoSeqUtils.getUUID());
        att.setFileContent(fileContent);
        att.setFileName(fileName);
        att.setFileType(type);
        attachDao.save(att);
        GovsAttachRealBo real = new GovsAttachRealBo();
        real.setAttachId(att.getAttachId());
        real.setAttaRealId(DaoSeqUtils.getUUID());
        real.setAttSeq(seq);
        real.setRealTableId(realTableId);
        real.setRealTable(getRealTable(realTable));
        attachRealDao.save(real);
        fr.setAttachId(att.getAttachId());
        return fr;
    }
    
    private String getRealTable(String realTable) {
        if(StringUtils.isEmpty(realTable)) {
            return null;
        }
        return realTable.toUpperCase(Locale.ENGLISH);
    }


}

dao实现层这边就不举例了。简单的将数据插入进去即可。注意文件存放字段 要用大字段。blob类型即可

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