通用的文件上传与下载

package com.lzy.project.common;

import com.lzy.common.constant.Constants;
import com.lzy.common.utils.StringUtils;
import com.lzy.common.utils.file.FileUploadUtils;
import com.lzy.common.utils.file.FileUtils;
import com.lzy.framework.config.LzyConfig;
import com.lzy.framework.config.ServerConfig;
import com.lzy.framework.web.domain.AjaxResult;
import com.lzy.project.knowledge.domain.OpeKnowledgeBase;
import com.lzy.project.knowledge.domain.vo.OpeKnowledgeBaseVO;
import com.lzy.project.knowledge.service.IOpeKnowledgeBaseService;
import com.lzy.project.operation.domain.FileInfo;
import com.lzy.project.operation.service.FileInfoService;
import com.lzy.project.tool.pdf.ConvertSwf;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;

/**
 * 通用请求处理
 *
 * @author lzy
 */
@RestController
public class CommonController {
    private static final Logger log = LoggerFactory.getLogger(CommonController.class);

    @Autowired
    private ServerConfig serverConfig;

    @Autowired
    private FileInfoService fileInfoService;
    @Autowired
    private IOpeKnowledgeBaseService iOpeKnowledgeBaseService;

    /**
     * 通用下载请求
     *
     * @param fileName 文件名称
     * @param delete   是否删除
     */
    @GetMapping("common/download")
    public void fileDownload(String fileName, Boolean delete, HttpServletResponse response,
        HttpServletRequest request) {
        try {
            if (!FileUtils.isValidFilename(fileName)) {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            String realFileName = System.currentTimeMillis() + fileName.substring(fileName.indexOf("_") + 1);
            String filePath = LzyConfig.getDownloadPath() + fileName;

            response.setCharacterEncoding("utf-8");
            response.setContentType("multipart/form-data");
            response.setHeader("Content-Disposition",
                "attachment;fileName=" + FileUtils.setFileDownloadHeader(request, realFileName));
            FileUtils.writeBytes(filePath, response.getOutputStream());
            if (delete) {
                FileUtils.deleteFile(filePath);
            }
        } catch (Exception e) {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 通用下载请求
     *
     * @param fileName 文件名称
     */
    @RequestMapping("common/downloadFile")
    @ResponseBody
    public void downloadFile(String fileName,String path, HttpServletResponse response,HttpServletRequest request) {
        try {
            if (!FileUtils.isValidFilename(fileName)) {
                throw new Exception(StringUtils.format("文件名称({})非法，不允许下载。 ", fileName));
            }
            path=path.substring(8,path.length());
            String filePath = LzyConfig.getProfile() + path;
            File file = new File(filePath);
            if (!file.exists()) {
                throw new Exception(StringUtils.format("文件不存在", fileName));
            }
            FileInputStream inputStream = new FileInputStream(file);
            // 设置输出格式\
            response.setCharacterEncoding("utf-8");
            response.setContentType("application/x-msdownload");
            response.addHeader("Content-Disposition", "attachment;filename=" +
                    FileUtils.setFileDownloadHeader(request, fileName));
            // 循环取出流中的数据
//            byte[] b = new byte[61858764];
//            int len;
//            while ((len = inputStream.read(b)) > 0) {
//                response.getOutputStream().write(b, 0, len);
//            }
//            inputStream.close();
            FileUtils.writeBytes(filePath, response.getOutputStream());
        } catch (Exception e) {
            log.error("下载文件失败", e);
        }
    }

    /**
     * 通用上传请求
     */
    @PostMapping("/common/upload")
    public AjaxResult uploadFile(MultipartFile file) throws Exception {
        try {
            // 上传文件路径
            String filePath = LzyConfig.getUploadPath();
            // 上传并返回新文件名称
            String fileName = FileUploadUtils.upload(filePath, file);
            String url = serverConfig.getUrl() + fileName;
            AjaxResult ajax = AjaxResult.success();
            ajax.put("fileName", fileName);
            ajax.put("url", url);
            return ajax;
        } catch (Exception e) {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 进行office文件转换
     */
    @GetMapping("/common/convertFile/{fileId}")
    public AjaxResult convertFile(@PathVariable("fileId") Long fileId) throws Exception {
        try {
            log.debug("CommonController.convertFile method enter, and param fileId={}", fileId);
            if (null == fileId) {
                return AjaxResult.error("参数错误，文件ID不能为空.");
            }
            FileInfo fileInfo = this.fileInfoService.selectFileInfoById(fileId);
            if (null == fileInfo || StringUtils.isEmpty(fileInfo.getCllj())) {
                return AjaxResult.error("文件不存在。");
            }
            log.debug("CommonController.convertFile fileInfo.getCllj={}", fileInfo.getCllj());
            String filepath = LzyConfig.getProfile() + fileInfo.getCllj().replace("/profile", "");
            log.debug("CommonController.convertFile filepath={}", filepath);
            ConvertSwf.getInstance().beginConvert(filepath);
            return AjaxResult.success("转换成功。");
        } catch (Exception e) {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 知识库文件预览时进行office文件转换
     * 根据fileSource判断该条数据来自附件材料管理表还是知识库模块的表的数据
     */
    @GetMapping("/common/convertKnowledgeFile")
    public AjaxResult convertKnowledgeFile(OpeKnowledgeBaseVO opeKnowledgeBaseVO) throws Exception {
        Long fileId = opeKnowledgeBaseVO.getId();
        String fileSource = opeKnowledgeBaseVO.getFileSource();
        String filePath = "";
        try {
            log.debug("CommonController.convertFile method enter, and param fileId={}", fileId);
            if (null == fileId) {
                return AjaxResult.error("参数错误，文件ID不能为空.");
            }
            if ("knowledge".equals(fileSource)) {
                OpeKnowledgeBase opeKnowledgeBase = this.iOpeKnowledgeBaseService.selectOpeKnowledgeBaseById(fileId);
                if (null == opeKnowledgeBase || StringUtils.isEmpty(opeKnowledgeBase.getFilePath())) {
                    return AjaxResult.error("文件不存在。");
                }
                log.debug("CommonController.convertKnowledgeFile opeKnowledgeBase.getFilePath={}",
                    opeKnowledgeBase.getFilePath());
                filePath = LzyConfig.getProfile() + opeKnowledgeBase.getFilePath().replace("/profile", "");
            } else if ("fjclgl".equals(fileSource)) {
                FileInfo fileInfo = this.fileInfoService.selectFileInfoById(fileId);
                if (null == fileInfo || StringUtils.isEmpty(fileInfo.getCllj())) {
                    return AjaxResult.error("文件不存在。");
                }
                log.debug("CommonController.convertKnowledgeFile fileInfo.getCllj={}", fileInfo.getCllj());
                filePath = LzyConfig.getProfile() + fileInfo.getCllj().replace("/profile", "");
            } else {
                return AjaxResult.error("参数传递错误，无法处理，请联系管理员。");
            }

            log.debug("CommonController.convertKnowledgeFile filepath={}", filePath);
            ConvertSwf.getInstance().beginConvert(filePath);
            return AjaxResult.success("转换成功。");
        } catch (Exception e) {
            return AjaxResult.error(e.getMessage());
        }
    }

    /**
     * 本地资源通用下载
     */
    @GetMapping("/common/download/resource")
    public void resourceDownload(String name, HttpServletRequest request, HttpServletResponse response)
        throws Exception {
        // 本地资源路径
        String localPath = LzyConfig.getProfile();
        // 数据库资源地址
        String downloadPath = localPath + StringUtils.substringAfter(name, Constants.RESOURCE_PREFIX);
        // 下载名称
        String downloadName = StringUtils.substringAfterLast(downloadPath, "/");
        response.setCharacterEncoding("utf-8");
        response.setContentType("multipart/form-data");
        response.setHeader("Content-Disposition",
            "attachment;fileName=" + FileUtils.setFileDownloadHeader(request, downloadName));
        FileUtils.writeBytes(downloadPath, response.getOutputStream());
    }
}