图片、pdf、wrod和excel 在线预览

自定义文件服务器图片、pdf、wrod和excel 在线预览

场景介绍
准备工作
预览图片，pdf
预览word
预览excel
效果图

场景介绍

因公司项目中需要使用到文件交互,因此在网上找了一个demo做了点修改，原项目功能只有上传和下载，现要求在线预览pdf word excel 文件，所以在原来的基础上进行修改使其支持在线预览，图片和pdf 的在线预览比较简单，word excel 的预览实现方式是先将word 和excel 文件转换成具有一定格式的html 然后输出在界面上，目前只支持.xls 和 .doc 文件预览

准备工作

1.需要用到的 jar 用于word excel的解析
2. PoiUtil2 类用于解析word excel 的工具类

package fileServer.util;import org.apache.poi.hssf.converter.ExcelToHtmlConverter;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.converter.PicturesManager;
import org.apache.poi.hwpf.converter.WordToHtmlConverter;
import org.apache.poi.hwpf.usermodel.Picture;
import org.apache.poi.hwpf.usermodel.PictureType;
import org.w3c.dom.Document;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.BufferedWriter;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;public class PoiUtil2 {public static final String dtLong = "yyyyMMddHHmmss";static DateFormat df = new SimpleDateFormat(dtLong);/*** Excel 转为　HTML* @param fileName* @param outputFile* @throws FileNotFoundException* @throws IOException* @throws ParserConfigurationException* @throws TransformerConfigurationException* @throws TransformerException*/public static void excelToHtml(String fileName, String outputFile)throws FileNotFoundException, IOException, ParserConfigurationException,TransformerConfigurationException, TransformerException {String htmlStr = excelPareToHtmlString(fileName);writeFile(htmlStr, outputFile);}public  static String  excelPareToHtmlString(String fileName)  throws FileNotFoundException, IOException, ParserConfigurationException,TransformerConfigurationException, TransformerException {InputStream is = new FileInputStream(fileName);HSSFWorkbook excelBook = new HSSFWorkbook(is);ExcelToHtmlConverter ethc = new ExcelToHtmlConverter(DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument());ethc.setOutputColumnHeaders(false);ethc.setOutputRowNumbers(false);ethc.processWorkbook(excelBook);Document htmlDocument = ethc.getDocument();ByteArrayOutputStream out = new ByteArrayOutputStream();DOMSource domSource = new DOMSource(htmlDocument);StreamResult streamResult = new StreamResult(out);TransformerFactory tf = TransformerFactory.newInstance();Transformer serializer = tf.newTransformer();serializer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");serializer.setOutputProperty(OutputKeys.INDENT, "yes");serializer.setOutputProperty(OutputKeys.METHOD, "html");serializer.transform(domSource, streamResult);out.close();String htmlStr = new String(out.toByteArray(),"UTF-8");htmlStr = htmlStr.replace("<h2>Sheet1</h2>", "").replace("<h2>Sheet2</h2>", "").replace("<h2>Sheet3</h2>", "").replace("<h2>Sheet4</h2>", "").replace("<h2>Sheet5</h2>", "");return  htmlStr;}/*** Word 转为　HTML** @param fileName* @param outputFile* @throws IOException* @throws ParserConfigurationException* @throws TransformerException*/
//    public static void wordToHtml(String fileName, String outputFile) throws
//            IOException, ParserConfigurationException, TransformerException {
//        String htmlStr = wordParseToHtmlString(fileName,null,null);
//        writeFile(htmlStr, outputFile);
//    }public static  String wordParseToHtmlString(String fileName, String imageStoragePath,HttpServletRequest request)throwsIOException, ParserConfigurationException, TransformerException {HWPFDocument wordDoc = new HWPFDocument(new FileInputStream(fileName));WordToHtmlConverter wthc = new WordToHtmlConverter(DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument());//这里用来处理word 中的图片 保存到服务器本地磁盘并且 返回在线可访问的地址wthc.setPicturesManager(new PicturesManager() {@Overridepublic String savePicture(byte[] bytes, PictureType pt, String string, float f, float f1) {//文件命名与FileUpLload上传文件名称规则一致String extension = pt.getExtension();//因为服务会给上传的文件追加时间搓防止文件重复 oldName 上传之前的文件名称String oldName = System.currentTimeMillis() + "." + extension;String name = df.format(new Date()) + "-" + oldName;try {String targetPath = imageStoragePath + name;FileOutputStream out = new FileOutputStream(targetPath);out.write(bytes);out.close();String webroot = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + request.getContextPath();String fileurl = webroot + "/download?name=" + name;name = fileurl;//返回在线可访问的地址 如 http://localhost:8000/download?name=1.jpg;} catch (Exception e) {e.printStackTrace();}return name;}});wthc.processDocument(wordDoc);List<Picture> pics = wordDoc.getPicturesTable().getAllPictures();if (null != pics && pics.size() > 0) {for (Picture pic : pics) {String suggestFullFileName = pic.suggestFullFileName();pic.writeImageContent(new FileOutputStream(suggestFullFileName));}}Document htmlDocument = wthc.getDocument();ByteArrayOutputStream out = new ByteArrayOutputStream();DOMSource domSource = new DOMSource(htmlDocument);StreamResult streamResult = new StreamResult(out);TransformerFactory tf = TransformerFactory.newInstance();Transformer serializer = tf.newTransformer();serializer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");serializer.setOutputProperty(OutputKeys.INDENT, "yes");serializer.setOutputProperty(OutputKeys.METHOD, "html");serializer.transform(domSource, streamResult);out.close();String htmlStr = new String(out.toByteArray(),"UTF-8");return  htmlStr;}public static void writeFile(String content, String path) {FileOutputStream fos = null;BufferedWriter bw = null;File file = new File(path);try {fos = new FileOutputStream(file);bw = new BufferedWriter(new OutputStreamWriter(fos, "UTF-8"));bw.write(content);} catch (FileNotFoundException ex) {ex.printStackTrace();} catch (UnsupportedEncodingException ex) {ex.printStackTrace();} catch (IOException ex) {ex.printStackTrace();} finally {try {if (null != bw) {bw.close();}if (null != fos) {fos.close();}} catch (IOException ex) {ex.printStackTrace();}}}/*** @param args the command line arguments*/public static void main(String[] args) {try {PoiUtil2.excelToHtml("C:\\Users\\-AiYuan\\Desktop\\20190508001.xls", "C:\\Users\\-AiYuan\\Desktop\\test.html");} catch (IOException e) {e.printStackTrace();} catch (ParserConfigurationException e) {e.printStackTrace();} catch (TransformerException e) {e.printStackTrace();}//        try {
//        PoiUtil2.wordToHtml("C:\\Users\\-AiYuan\\Desktop\\安卓扫描枪对接文档 .doc","C:\\Users\\-AiYuan\\Desktop\\test2.html");
//        } catch (IOException ex) {
//            logger.error(ex);
//        } catch (ParserConfigurationException ex) {
//            logger.error(ex);
//        } catch (TransformerException ex) {
//            logger.error(ex);
//        }}
}

预览图片，pdf

    protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// 省略通请求地址  //localhost:8000/download?name=1.jpg;  获取文件代码  //假装这个file 是通过地址File file = new File("C:\\Users\\-AiYuan\\Desktop\\1.jpg");previewFile(response, file, oldName);}//预览文件 图片和dpf 都可以用此方法预览void previewFile(HttpServletResponse response, File file, String oldName) {//指定浏览器内部打开response.setHeader("Content-Disposition", "inline; filename=\"" + oldName + "\"");writeFile(response, file);}
// 写入文件
void writeFile(HttpServletResponse response, File file) {ServletOutputStream os = null;FileInputStream is = null;BufferedOutputStream bos = null;try {os = response.getOutputStream();is = new FileInputStream(file);bos = new BufferedOutputStream(os);byte[] len = new byte[1024];int read = 0;while ((read = is.read(len)) != -1) {bos.write(len, 0, read);}bos.flush();} catch (IOException e) {e.printStackTrace();} finally {if (bos != null) {try {bos.close();} catch (IOException e) {e.printStackTrace();}}if (is != null) {try {is.close();} catch (IOException e) {e.printStackTrace();}}}}

预览word

 protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// 省略通请求地址  //localhost:8000/download?name=1.jpg;  获取文件代码  //假装这个file 是通过地址File file = new File("C:\\Users\\-AiYuan\\Desktop\\1.jpg");//imageStoragePath  word 中图片要存储的路径 previewOfficeDoc(request, response, file.getAbsolutePath(), imageStoragePath);}//预览word .doc 文件void previewOfficeDoc(HttpServletRequest request, HttpServletResponse response,String fileAbsolutePath, String buildPath) {ServletOutputStream os = null;try {os = response.getOutputStream();//调用工具类的 word 转htmlString wordParseToHtmlString = PoiUtil2.wordParseToHtmlString(fileAbsolutePath, buildPath, request);os.write(wordParseToHtmlString.getBytes("UTF-8"));os.flush();} catch (IOException | ParserConfigurationException | TransformerException e) {e.printStackTrace();} finally {if (os != null) {try {os.close();} catch (IOException e) {e.printStackTrace();}}}}

预览excel

 protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// 省略通请求地址  //localhost:8000/download?name=1.jpg;  获取文件代码  //假装这个file 是通过地址File file = new File("C:\\Users\\-AiYuan\\Desktop\\1.jpg");previewOfficeXls(response,  file.getAbsolutePath());}//预览excel .xls 文件void previewOfficeXls(HttpServletResponse response, String fileAbsolutePath) {ServletOutputStream os = null;try {os = response.getOutputStream();//调用 解析工具解析excelString wordParseToHtmlString = PoiUtil2.excelPareToHtmlString(fileAbsolutePath);os.write(wordParseToHtmlString.getBytes("UTF-8"));os.flush();} catch (IOException | ParserConfigurationException | TransformerException e) {e.printStackTrace();} finally {if (os != null) {try {os.close();} catch (IOException e) {e.printStackTrace();}}}}

效果图

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图片、pdf、wrod和excel 在线预览

自定义文件服务器图片、pdf、wrod和excel 在线预览

场景介绍

准备工作

预览图片，pdf

预览word

预览excel

效果图

图片、pdf、wrod和excel 在线预览相关推荐

最新文章

热门文章

图片、pdf、wrod和excel 在线预览

自定义文件服务器 图片、pdf、wrod和excel 在线预览

场景介绍

准备工作

预览图片，pdf

预览word

预览excel

效果图

图片、pdf、wrod和excel 在线预览相关推荐

最新文章

热门文章

自定义文件服务器图片、pdf、wrod和excel 在线预览