kkFileView二开之word转pdf接口

1 kkFileView源码下载及编译
2 word转pdf接口
- 2.1 背景
- 2.2 接口开发
- 2.3 接口测试
- - 2.3.1 word文件准备
  - 2.3.2 文件链接转pdf
  - 2.3.3 上传文件转pdf
3 部署

1 kkFileView源码下载及编译

前文【kkFileView二开之源码编译及部署】已完成了kkFileView源码二开的基础准备。

2 word转pdf接口

2.1 背景

在实际工作过程中，经常会有系统针对word模板填充，并转换为pdf的需求，如合同、订单等文件，在代码内集成word转pdf一方面代码会比较臃肿，另一方面兼容性相较于kkfile会差一点。
在使用kkFileView的过程中，在线浏览word文档界面上可以以pdf的方式进行预览，因而想到可以使用kkFileView对外提供接口，传入指定的word文件后，将该文件转换为pdf后返回，通过阅读kkFileView源码后，发现可以实现，故编写该文档。

2.2 接口开发

在cn.keking.web.controller包下，新增ConvertController.java 文件

package cn.keking.web.controller;import cn.keking.config.ConfigConstants;
import cn.keking.model.FileAttribute;
import cn.keking.model.FileType;
import cn.keking.model.ReturnResponse;
import cn.keking.service.FileHandlerService;
import cn.keking.service.OfficeToPdfService;
import cn.keking.utils.DownloadUtils;
import cn.keking.utils.KkFileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.util.StreamUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLDecoder;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;/*** 文件转换接口*/
@Controller
public class ConvertController {private final String fileDir = ConfigConstants.getFileDir();//临时目录private final String tempPath = "temp" + File.separator;@Autowiredprivate OfficeToPdfService officeToPdfService;@Autowiredprivate FileHandlerService fileHandlerService;private static final String FILE_DIR = ConfigConstants.getFileDir();/*** 转换文件并输出* @param rep* @param fileAttribute* @param filePath*/private void coverAndWrite(HttpServletResponse rep,FileAttribute fileAttribute,String filePath){String covertFilePath = "";try{String fileName = fileAttribute.getName().replace(fileAttribute.getSuffix(),"pdf");covertFilePath = FILE_DIR+ fileName;//调用kkfile服务进行转换officeToPdfService.openOfficeToPDF(filePath, covertFilePath, fileAttribute);rep.setContentType("application/octet-stream");rep.setHeader("Content-Disposition", "attachment; filename=\"" + fileName + "\"");// 创建输出流ServletOutputStream outStream = rep.getOutputStream();try (InputStream in = new BufferedInputStream(Files.newInputStream(Paths.get(covertFilePath)))) {byte[] buffer = new byte[4096];int bytesRead;while ((bytesRead = in.read(buffer)) != -1) {outStream.write(buffer, 0, bytesRead);}} finally {outStream.flush();outStream.close();}}catch (Exception e){e.printStackTrace();}finally {//完成后，删除文件File file = new File(filePath);file.deleteOnExit();file = new File(covertFilePath);file.deleteOnExit();}}/*** 使用链接将文件转换为pdf* @param fileUrl* @param req* @param rep* @throws Exception*/@GetMapping("/word2Pdf")public void word2Pdf(String fileUrl, HttpServletRequest req, HttpServletResponse rep) throws Exception{if(null == fileUrl || fileUrl.equals("")){throw new Exception("文件路径不能为空");}fileUrl = URLDecoder.decode(fileUrl,"utf-8");//根据链接解析文件信息FileAttribute fileAttribute = fileHandlerService.getFileAttribute(fileUrl, req);//下载文件ReturnResponse<String> response = DownloadUtils.downLoad(fileAttribute, fileAttribute.getName());//进行转换this.coverAndWrite(rep,fileAttribute,response.getContent());}/*** 通过文件将word转为pdf* @param req* @param rep* @param file*/@PostMapping("/word2PdfByFile")public void word2PdfByFile(HttpServletRequest req, HttpServletResponse rep,@RequestParam("file") MultipartFile file){FileAttribute fileAttribute = new FileAttribute();fileAttribute.setName(file.getOriginalFilename());fileAttribute.setType(FileType.typeFromFileName(fileAttribute.getName()));fileAttribute.setSuffix(KkFileUtils.suffixFromFileName(fileAttribute.getName()));//上传文件至指定路径File tempFile = upLoadFile(file);String filePath = tempFile.getPath();//进行转换this.coverAndWrite(rep,fileAttribute,filePath);}/*** 上传文件* @param file* @return*/private File upLoadFile(MultipartFile file){File outFile = new File(fileDir + tempPath);if (!outFile.exists() && !outFile.mkdirs()) {throw new RuntimeException("创建文件夹【{}】失败，请检查目录权限！");}Path path = Paths.get(fileDir + tempPath + file.getOriginalFilename());try (InputStream in = file.getInputStream(); OutputStream out = Files.newOutputStream(path)) {StreamUtils.copy(in, out);} catch (IOException e) {throw new RuntimeException("文件上传失败"+e.getMessage());}return path.toFile();}
}