com.documents4j documents4j-local 1.1.1 com.documents4j documents4j-transformer-msoffice-word 1.1.1 import com.documents4j.api.DocumentType;import com.documents4j.api.IConverter;import com.documents4j.job.LocalConverter;/**
* 文档文件预览
*/
@RequestMapping(path = "/previewFile")
public void preview(HttpServletResponse response, @RequestParam(required = true)String path, @RequestParam(required = true)String fileName, @RequestParam(required = true)String suffix) throws Exception {
// 读取pdf文件的路径
String pdfPath="";
// 将对应的后缀转换成小写
String lastSuffix=suffix.toLowerCase();
//读取文件内容,获取文件存储的路径
String orgPath = filePath + path;
// 生成pdf文件的路径
String toPath = filePath + "pdf/";
// 判断对应的pdf是否存在，不存在则创建
File folder = new File(toPath);
if (!folder.exists()) {
folder.mkdirs();
}
// doc类型
if (lastSuffix.equals("pdf")) {
// pdf 文件不需要转换，直接从上传文件路径读取即可
pdfPath=orgPath;
} else {
// 转换之后的pdf文件
String newName=fileName.replace(lastSuffix,"pdf");;
File newFile = new File( toPath+"/"+newName);
// 如果转换之后的文件夹中有转换后的pdf文件，则直接从里面读取即可
if (newFile.exists()) {
pdfPath =toPath+"/"+newName;
}else {
pdfPath = wordToPdf(fileName,orgPath, toPath,lastSuffix);
}
}
// 读取文件流上
FileInputStream fis = new FileInputStream(pdfPath);
//设置返回的类型
response.setContentType("application/pdf");
//得到输出流，其实就是发送给客户端的数据。
OutputStream os = response.getOutputStream();
try {
int count = 0;
//fis.available()返回文件的总字节数
byte[] buffer = new byte[fis.available()];
//read(byte[] b)方法一次性读取文件全部数据。
while ((count = fis.read(buffer)) != -1)
os.write(buffer, 0, count);
os.flush();
} catch (IOException e) {
e.printStackTrace();
} finally {
if (os != null)
os.close();
if (fis != null)
fis.close();
}
}
/** * 将之前对应的word文件转换成pdf，然后预览pdf文件 */ public String wordToPdf(String orgFile,String orgPath, String toPath, String suffix ){ // 转换之后的pdf文件 String targetFile=orgFile.replace(suffix,“pdf”); File inputWord = new File(orgPath); File outputFile = new File(toPath+targetFile); try { InputStream docxInputStream = new FileInputStream(inputWord); OutputStream outputStream = new FileOutputStream(outputFile); IConverter converter = LocalConverter.builder().build(); if(suffix.equals(“doc”)){ converter.convert(docxInputStream).as(DocumentType.DOC).to(outputStream).as(DocumentType.PDF).execute(); } else if(suffix.equals(“docx”)){ converter.convert(docxInputStream).as(DocumentType.DOCX).to(outputStream).as(DocumentType.PDF).execute(); } else if(suffix.equals(“txt”)){ converter.convert(docxInputStream).as(DocumentType.TEXT).to(outputStream).as(DocumentType.PDF).execute(); } outputStream.close(); } catch (Exception e) { e.printStackTrace(); } return toPath+targetFile; }
