文章目录
- 1. 格式转换
- 2. 在线预览
1. 格式转换
package com.gblfy.office.utils;
import org.apache.commons.io.IOUtils;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
/**
* @@author gblfy
* @Date : 2022-11-05 11:20
* @describe: 文档在线预览
* <p>
* 服务器环境：Linux环境
* 现支持文档类型: Excel word ppt pdf
*/
public class ExecuteLinuxShellUtil {
private static ExecuteLinuxShellUtil linuxPageDIsplsyFileUtil;
public static synchronized ExecuteLinuxShellUtil getSwitchUtil() {
if (linuxPageDIsplsyFileUtil == null) {
linuxPageDIsplsyFileUtil = new ExecuteLinuxShellUtil();
}
return linuxPageDIsplsyFileUtil;
}
/**
* 文档在线预览
*
* @param response
* @param fileStoragePath 文件存储路径 (前段获取文件存储路径返给后台)
* @param beforeConversion 文件名(必须带文件后缀名,这里指的就是文件全名称)
* @throws Exception
*/
public void conversionFile(HttpServletResponse response, String fileStoragePath, String beforeConversion) throws Exception {
//文件存储路径
//fileStoragePath ="/app/";
//转换前的文件名
//beforeConversion ="20191009133209lis_chgrpt.docx";
String fileNamePath = fileStoragePath + beforeConversion;
File file = new File(fileNamePath);
if (!file.exists()) {
System.err.println("库存中没有指定文件。。。。");
return;
}
//获取到文件名
String interceptFileName = beforeConversion.substring(0, beforeConversion.lastIndexOf("."));
//截取文件后缀名
String fileNameSuffix = beforeConversion.substring(beforeConversion.lastIndexOf(".") + 1);
String command = null;
if ("pdf".equals(fileNameSuffix)) {
/**
* 在线预览方法
*/
PdfPreviewUtil.openPdf(response, fileStoragePath + interceptFileName + ".pdf");
} else if ("doc".equals(fileNameSuffix) || "docx".equals(fileNameSuffix)
|| "xls".equals(fileNameSuffix) || "xlsx".equals(fileNameSuffix)
|| "ppt".equals(fileNameSuffix) || "pptx".equals(fileNameSuffix)) {
//文件格式转换命令 unoconv插件实现
command = "/opt/libreoffice6.3/program/soffice --headless --invisible --convert-to pdf " + fileNamePath;
//格式转换+在线预览
formatConverAndPreview(command, response, fileStoragePath, interceptFileName);
} else {
System.err.println("暂不支持该类型文件在线预览！！！");
return;
}
}
/**
* 格式转换+在线预览 方法
*
* @param command 文件格式转换命令 例：/usr/bin/unoconv -f pdf /app/1.pptx
* @param response http响应网页,实现在线预览
* @param fileStoragePath 准备文件存放路径 例：/app/
* @param interceptFileName 文件名 例: 1.pptx
* @throws Exception
*/
public void formatConverAndPreview(String command,
HttpServletResponse response,
String fileStoragePath,
String interceptFileName) throws Exception {
/**
* 执行shell命令，格式转换方法
*/
//String temp ="/usr/bin/unoconv -f pdf " + command;
executeCommand(command);
/**
* 在线预览方法
*/
PdfPreviewUtil.openPdf(response, fileStoragePath + interceptFileName + ".pdf");
}
/**
* 执行shell命令
* <p>
* 統一把文件格式转换成pdf文件
*
* @param command 文件格式转换命令
* 例1：/usr/bin/unoconv -f pdf /app/1.pptx
* 例2：/opt/libreoffice6.3/program/soffice --headless --invisible --convert-to pdf /app/1.pptx
*/
private static void executeCommand(String command) {
StringBuffer output = new StringBuffer();
Process process;
InputStreamReader inputStreamReader = null;
BufferedReader reader = null;
try {
process = Runtime.getRuntime().exec(command);
process.waitFor();
inputStreamReader = new InputStreamReader(process.getInputStream(), "UTF-8");
reader = new BufferedReader(inputStreamReader);
String line = "";
while ((line = reader.readLine()) != null) {
output.append(line + "\n");
}
//p.destroy();//这个一般不需要
} catch (Exception e) {
e.printStackTrace();
} finally {
IOUtils.closeQuietly(reader);
IOUtils.closeQuietly(inputStreamReader);
}
}
}
2. 在线预览
package com.gblfy.office.utils;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
/**
* pdf在吸纳预览方法
*
* @author gblfy
* @date 2022-11-05
*/
public class PdfPreviewUtil {
/**
* 在线预览方法
* 把转换后的pdf文件在网页上进行预览
*
* @param response http响应
* @param previewFile 文件的決定路径 例：/app/20191009133209_chgrpt.pdf
* @throws Exception 格式转换过程中的异常
*/
public static void openPdf(HttpServletResponse response, String previewFile) throws Exception {
InputStream inputStream = null;
OutputStream outputStream = null;
//String path ="/app/20191009133209_chgrpt.pdf";
inputStream = new FileInputStream(previewFile);
//响应文件的类型
response.setContentType("application/pdf");
response.setCharacterEncoding("UTF-8");
outputStream = response.getOutputStream();
int a = 0;
byte[] b = new byte[1024];
while ((a = inputStream.read(b)) != -1) {
outputStream.write(b, 0, a);
}
if (inputStream != null) {
inputStream.close();
}
if (outputStream != null) {
outputStream.close();
outputStream.flush();
}
}
/**
* 删除文件
*
* @param filePath 文件
* @return
*/
public static boolean deleteFile(String filePath) {
boolean flag = false;
File file = new File(filePath);
// 路径为文件且不为空则进行删除
if (file.isFile() && file.exists()) {
file.delete();
flag = true;
}
return flag;
}
}
