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kkFileView二开之word转pdf接口

冬济 2025-03-02 00:01:02

简介kkFileView二开之word转pdf接口

kkFileView二开之word转pdf接口

1 kkFileView源码下载及编译
2 word转pdf接口
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;
    @Autowired
    private OfficeToPdfService officeToPdfService;
    @Autowired
    private 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();
    }
}