package com.thhy.filectrl.utils;
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import org.apache.commons.io.IOUtils;
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import javax.servlet.http.HttpServletResponse;
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import java.io.*;
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public class ConvertUtils {
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public void conversionFile(HttpServletResponse response, String fileStoragePath, String beforeConversion) throws Exception {
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//文件存储路径
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//fileStoragePath ="/app/";
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//转换前的文件名
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//beforeConversion ="20191009133209lis_chgrpt.docx";
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String fileNamePath = fileStoragePath + beforeConversion;
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File file = new File(fileNamePath);
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if (!file.exists()) {
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System.err.println("库存中没有指定文件。。。。");
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return;
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}
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//获取到文件名
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String interceptFileName = beforeConversion.substring(0, beforeConversion.lastIndexOf("."));
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//截取文件后缀名
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String fileNameSuffix = beforeConversion.substring(beforeConversion.lastIndexOf(".") + 1);
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String command = null;
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if ("pdf".equals(fileNameSuffix)) {
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/**
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* 在线预览方法
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*/
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openPdf(response, fileStoragePath + interceptFileName + ".pdf");
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} else if ("doc".equals(fileNameSuffix) || "docx".equals(fileNameSuffix) || "xls".equals(fileNameSuffix) || "xlsx".equals(fileNameSuffix)
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|| "ppt".equals(fileNameSuffix) || "pptx".equals(fileNameSuffix)) {
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//文件格式转换命令 unoconv插件实现
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command = "/opt/libreoffice6.3/program/soffice --headless --invisible --convert-to pdf " + fileNamePath;
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//格式转换+在线预览
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formatConverAndPreview(command, response, fileStoragePath, interceptFileName);
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} else {
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System.err.println("暂不支持该类型文件在线预览！！！");
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return;
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}
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}
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/**
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* 格式转换+在线预览 方法
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*
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* @param command 文件格式转换命令 例：/usr/bin/unoconv -f pdf /app/1.pptx
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* @param response http响应网页,实现在线预览
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* @param fileStoragePath 准备文件存放路径 例：/app/
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* @param interceptFileName 文件名 例: 1.pptx
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* @throws Exception
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*/
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public void formatConverAndPreview(String command,
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HttpServletResponse response,
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String fileStoragePath,
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String interceptFileName) throws Exception {
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/**
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* 格式转换方法
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*/
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//String temp ="/usr/bin/unoconv -f pdf " + command;
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executeCommand(command);
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/**
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* 在线预览方法
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*/
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openPdf(response, fileStoragePath + interceptFileName + ".pdf");
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}
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/**
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* 在线预览方法
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* 把转换后的pdf文件在网页上进行预览
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*
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* @param response http响应
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* @param previewFile 文件的決定路径 例：/app/20191009133209_chgrpt.pdf
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* @throws Exception 格式转换过程中的异常
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*/
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private static void openPdf(HttpServletResponse response, String previewFile) throws Exception {
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InputStream inputStream = null;
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OutputStream outputStream = null;
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//String path ="/app/20191009133209_chgrpt.pdf";
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inputStream = new FileInputStream(previewFile);
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//响应文件的类型
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response.setContentType("application/pdf");
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outputStream = response.getOutputStream();
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int a = 0;
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byte[] b = new byte[1024];
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while ((a = inputStream.read(b)) != -1) {
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outputStream.write(b, 0, a);
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}
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if (outputStream != null) {
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outputStream.close();
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}
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if (inputStream != null) {
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inputStream.close();
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}
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}
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/**
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* 格式转换方法
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* <p>
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* 統一把文件转换成pdf文件
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*
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* @param command 文件格式转换命令 例：/usr/bin/unoconv -f pdf /app/1.pptx
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* @throws Exception 格式转换过程中的异常
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*/
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private static void executeCommand(String command) throws Exception {
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StringBuffer output = new StringBuffer();
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Process process;
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InputStreamReader inputStreamReader = null;
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BufferedReader reader = null;
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try {
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process = Runtime.getRuntime().exec(command);
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process.waitFor();
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inputStreamReader = new InputStreamReader(process.getInputStream(), "UTF-8");
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reader = new BufferedReader(inputStreamReader);
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String line = "";
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while ((line = reader.readLine()) != null) {
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output.append(line + "\n");
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}
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//p.destroy();//这个一般不需要
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} catch (Exception e) {
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e.printStackTrace();
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} finally {
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IOUtils.closeQuietly(reader);
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IOUtils.closeQuietly(inputStreamReader);
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}
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}
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}
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