一、需求：
1、客戶在公共場所，需要在系統上查看文件內容
二、實現思路
1、通過前端獲取訪問的文件的全路徑，判斷文件的類型
2、如果是office文件、文本文件則進行裝換成pdf文件或者html頁面；如果是圖片，則直接轉移到預覽文件夾
3、將文件類型和文件相對路徑返回頁面進行加載
三、資源
1）、部署pdf.js查看器：
1、進入官網，選擇Stable版本下載pdf.js插件並解壓到本地。
官方網站地址：http://mozilla.github.io/pdf.js/ 如不能訪問,使用我自己下載: 鏈接：https://pan.baidu.com/s/1x1N_p-QTEripSr51tijk8A 提取碼：xabc
2、在服務器根目錄創建
3、在瀏覽器中訪問服務器地址，能夠看到
4、打開
5、在地址欄中輸入 http://10.0.0.5/pdf/web/viewer.html?file=pdf文件地址，在pdf文件地址正確的情況下，可以看到pdf文件的內容已經顯示出來了，這樣就說明實現成功了。
6、如果想在自己的項目中使用，可以在前端使用
pdf靜態資源目錄，並放入剛才解壓的文件。
3、在瀏覽器中訪問服務器地址，能夠看到
pdf這個文件夾，說明上一步的部署是成功的。
4、打開
pdf/web/viewer.html文件，會在瀏覽器上顯示出一個pdf文檔。
5、在地址欄中輸入 http://10.0.0.5/pdf/web/viewer.html?file=pdf文件地址，在pdf文件地址正確的情況下，可以看到pdf文件的內容已經顯示出來了，這樣就說明實現成功了。
6、如果想在自己的項目中使用，可以在前端使用
iframe標簽來進行顯示。
<iframe src="http://127.0.0.1:8080/pdf/web/viewer.html?file=pdf文件地址" width="100%" height="100%" style="position:fixed;left: 0px;top: 0px;" ></iframe>
2）、部署Jacob
1、下載好jacob、itextpdf的jar包、jacob配置文件
鏈接：https://pan.baidu.com/s/1IIGVaWuTvvltoq0AfWyycw 提取碼：yu1k
2、將jacob版本對應的dll文件放到jdk或jre的bin目錄里，如失敗，在對應的項目服務器bin目錄下也放。
四、代碼區域
1、前端
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <base href="<%=basePath%>" target="_self"> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>PDF查看</title> <style type="text/css"> </style> <script type="text/javascript" src="<%=WDK_ROOT%>/pdf/build/pdf.js"></script> <script type="text/javascript" src="<%=WDK_ROOT%>/core/js/wdk.js"></script> <script type="text/javascript"> var strparam = $.urlparam_decode($.getURLParam('param')); var jparam = $.str2json(strparam); var _fileurl = jparam.queryParams.fileurl; //文件絕對路徑 //var _filename = jparam.queryParams.filename;//文件名稱，后台直接從路徑中獲取 var _filesuffix = jparam.queryParams.filesuffix;//文件后綴 window.onload = function(){ $.cuajax({ url:'wdk?action=io.officefile&method=fileView' ,method:'post' ,timeout:WDK_Timeout ,data:{fileurl:_fileurl //,filename:_filename ,filesuffix:_filesuffix} ,success:function(result){ var jres = $.str2json(result); if('1'==jres.code){ debugger var newfilename = jres.newfilename;//文件名稱 var newfilesuffix = jres.newfilesuffix;//文件后綴 var newfileurl = jres.newfileurl;//預覽文件位置 var url = "<%=WDK_ROOT%>/pdf/web/viewer.html?file="+newfileurl+"/"+newfilename; if(newfilesuffix == "pdf"){ var url_str = "<iframe src=" + url + " width='100%' height='100%'></iframe>"; document.getElementById("layout_content").innerHTML=url_str; }else if(newfilesuffix == "jpg"||newfilesuffix == "gif"||newfilesuffix == "bmp"||newfilesuffix == "png"){ $('#layout_content').append('<img src="' + newfileurl+'/'+newfilename +'" width="100%" height="100%"/>'); } }else{ alert_info(jres.desc); } } ,error:function(result){ $.wait_close(); alert('操作失敗'); } }); } </script> </head> <body class="easyui-layout" style="padding:0px;margin:0px;background-color:#FFFFFF;"> <!-- 表格 --> <div id="layout_content" data-options="region:'center',border:false,collapsed:false" style="overflow:hidden;border:1px solid #ddd;" > </div> </body> </html>
2、后端控制器
/** * 在線預覽 * @throws Exception */ public void fileView(HttpServletRequest request,HttpServletResponse response) throws Exception { JSONObject json = new JSONObject(); String fileurl = _getParameter("fileurl", request, response);//保存文件目錄【絕對路徑：全路徑】 //String fileName = _getParameter("filename", request, response);//文件名稱【不含隨機數11位】 String fileSuffix = _getParameter("filesuffix", request, response);//文件后綴 File fileExist = new File(fileurl); if (fileExist.exists()) { json.put("code", "1"); json.put("desc", "文件查找成功"); System.out.println("文件查找成功"); System.out.println("文件位置:"+fileurl); String[] fileurl_str = fileurl.split("/"); String fileName = fileurl_str[fileurl_str.length-1];//文件名稱【含隨機數11位】 String fileViewPath = WDKCore._RESOURCE_ATTACHMENT + "/" + fileurl_str[fileurl_str.length - 3] + "/" + fileurl_str[fileurl_str.length - 2] + "/previewfile"; //預覽保存文件夾 //判斷是否存在預覽文件夾,不存在則新增 File isfile = new File(fileViewPath); if(!isfile.exists()){ isfile.mkdirs(); } System.out.println("預覽文件位置:"+fileViewPath); //String fileSuffix = fileName.substring(fileName.lastIndexOf(".")+1);//文件后綴 if (fileSuffix.equals("pdf") || fileSuffix.equals("jpg") || fileSuffix.equals("gif") || fileSuffix.equals("bmp") || fileSuffix.equals("png")) {//判斷pdf和office區分 //將文件拷貝到預覽文件下 String newFileName = fileViewPath + "/" + fileName; //copyFile(fileurl, newFileName);//流處理，不使用，性能太差 copyTotherFolders(fileurl, newFileName); json.put("newfilesuffix", fileSuffix); json.put("newfilename", fileName); } else { //轉換成pdf String onlyfileName = fileName.substring(0, fileName.indexOf("."));//文件名稱【不包含后綴】 String newFileName = fileViewPath + "/" + onlyfileName + ".pdf"; File file = new File(newFileName); if (!file.exists()) {//存在轉換后文件 Jacob2PDF.officeFileToPDF(fileurl, newFileName);//第一個為舊路徑帶上文件名，第二個是新路徑帶上文件名 //Jacob2Html.officeFileToHtml(fileurl, newFileName);//第一個為舊路徑帶上文件名，第二個是新路徑帶上文件名 } json.put("newfilesuffix", "pdf"); json.put("newfilename", onlyfileName + ".pdf"); } //獲取相對路徑/attachment/billfile/202012/文件名 String[] new_fileurl = fileViewPath.split("/"); String fileViewUrl = ""; for (int i = 3; i <new_fileurl.length; i++) { fileViewUrl += "/"+ new_fileurl[i]; } json.put("newfileurl", fileViewUrl); } else { json.put("code", "0"); json.put("desc", "文件查找失敗"); System.out.println("文件查找失敗"); } _PRINT(request, response, json.toString()); } /** *復制文件 * @param startPath 源文件絕對路徑【全路徑】 * @param endPath 目標文件夾 */ private void copyTotherFolders(String startPath,String endPath) throws IOException { File oldpaths = new File(startPath); File newpaths = new File(endPath); if (!newpaths.exists()) { Files.copy(oldpaths.toPath(), newpaths.toPath()); } else { newpaths.delete(); Files.copy(oldpaths.toPath(), newpaths.toPath()); } //該部分，使用流處理，暫時不使用 // String newfile = ""; // newfile += newpaths; // FileInputStream in = new FileInputStream(oldpaths); // File file = new File(newfile); // if (!file.exists()) { // file.createNewFile(); // } // FileOutputStream out = new FileOutputStream(newpaths); // byte[] buffer = new byte[1024]; // int c; // while ((c = in.read(buffer)) != -1) { // for (int i = 0; i < c; i++) { // out.write(buffer[i]); // } // } // in.close(); // out.close(); }
3、office文件、文本文件轉成pdf【改文章使用該方式，以及用pdf.js查看器加載顯示】
package com.pointlion.sys.mvc.admin.upload; import com.itextpdf.text.Document; import com.itextpdf.text.DocumentException; import com.itextpdf.text.Font; import com.itextpdf.text.Paragraph; import com.itextpdf.text.pdf.BaseFont; import com.itextpdf.text.pdf.PdfWriter; import com.jacob.activeX.ActiveXComponent; import com.jacob.com.ComThread; import com.jacob.com.Dispatch; import com.jacob.com.Variant; import java.io.*; import java.util.Date; public class Jacob2PDF { private static final Integer WORD_TO_PDF_OPERAND = 17; private static final Integer PPT_TO_PDF_OPERAND = 32; private static final Integer EXCEL_TO_PDF_OPERAND = 0; public static void doc2pdf(String srcFilePath, String pdfFilePath) throws Exception { ActiveXComponent app = null; Dispatch doc = null; try { ComThread.InitSTA(); app = new ActiveXComponent("Word.Application"); app.setProperty("Visible", false); Dispatch docs = app.getProperty("Documents").toDispatch(); Object[] obj = new Object[]{ srcFilePath, new Variant(false), new Variant(false),//是否只讀 new Variant(false), new Variant("pwd") }; doc = Dispatch.invoke(docs, "Open", Dispatch.Method, obj, new int[1]).toDispatch(); // Dispatch.put(doc, "Compatibility", false); //兼容性檢查,為特定值false不正確 Dispatch.put(doc, "RemovePersonalInformation", false); Dispatch.call(doc, "ExportAsFixedFormat", pdfFilePath, WORD_TO_PDF_OPERAND); // word保存為pdf格式宏，值為17 }catch (Exception e) { e.printStackTrace(); throw e; } finally { if (doc != null) { Dispatch.call(doc, "Close", false); } if (app != null) { app.invoke("Quit", 0); } ComThread.Release(); } } public static void ppt2pdf(String srcFilePath, String pdfFilePath) throws Exception { ActiveXComponent app = null; Dispatch ppt = null; try { ComThread.InitSTA(); app = new ActiveXComponent("PowerPoint.Application"); Dispatch ppts = app.getProperty("Presentations").toDispatch(); /* * call * param 4: ReadOnly * param 5: Untitled指定文件是否有標題 * param 6: WithWindow指定文件是否可見 * */ ppt = Dispatch.call(ppts, "Open", srcFilePath, true,true, false).toDispatch(); Dispatch.call(ppt, "SaveAs", pdfFilePath, PPT_TO_PDF_OPERAND); // ppSaveAsPDF為特定值32 } catch (Exception e) { e.printStackTrace(); throw e; } finally { if (ppt != null) { Dispatch.call(ppt, "Close"); } if (app != null) { app.invoke("Quit"); } ComThread.Release(); } } public static void excel2Pdf(String inFilePath, String outFilePath) throws Exception { ActiveXComponent ax = null; Dispatch excel = null; try { ComThread.InitSTA(); ax = new ActiveXComponent("Excel.Application"); ax.setProperty("Visible", new Variant(false)); ax.setProperty("AutomationSecurity", new Variant(3)); // 禁用宏 Dispatch excels = ax.getProperty("Workbooks").toDispatch(); Object[] obj = new Object[]{ inFilePath, new Variant(false), new Variant(false) }; excel = Dispatch.invoke(excels, "Open", Dispatch.Method, obj, new int[9]).toDispatch(); // 轉換格式 Object[] obj2 = new Object[]{ new Variant(EXCEL_TO_PDF_OPERAND), // PDF格式=0 outFilePath, new Variant(0) //0=標准 (生成的PDF圖片不會變模糊) ; 1=最小文件 }; Dispatch.invoke(excel, "ExportAsFixedFormat", Dispatch.Method,obj2, new int[1]); } catch (Exception es) { es.printStackTrace(); throw es; } finally { if (excel != null) { Dispatch.call(excel, "Close", new Variant(false)); } if (ax != null) { ax.invoke("Quit", new Variant[] {}); ax = null; } ComThread.Release(); } } /*** * * Excel轉化成PDF * * @param inputFile * @param pdfFile * @return */ private static int Ex2PDF(String inputFile, String pdfFile) { try { ComThread.InitSTA(true); ActiveXComponent ax = new ActiveXComponent("KET.Application"); System.out.println("開始轉化Excel為PDF..."); long date = new Date().getTime(); ax.setProperty("Visible", false); ax.setProperty("AutomationSecurity", new Variant(3)); // 禁用宏 Dispatch excels = ax.getProperty("Workbooks").toDispatch(); Dispatch excel = Dispatch .invoke(excels, "Open", Dispatch.Method, new Object[] { inputFile, new Variant(false), new Variant(false) }, new int[9]) .toDispatch(); // 轉換格式 Dispatch.invoke(excel, "ExportAsFixedFormat", Dispatch.Method, new Object[] { new Variant(0), // PDF格式=0 pdfFile, new Variant(EXCEL_TO_PDF_OPERAND) // 0=標准 (生成的PDF圖片不會變模糊) 1=最小文件 // (生成的PDF圖片糊的一塌糊塗) }, new int[1]); // 這里放棄使用SaveAs /* * Dispatch.invoke(excel,"SaveAs",Dispatch.Method,new Object[]{ * outFile, new Variant(57), new Variant(false), new Variant(57), * new Variant(57), new Variant(false), new Variant(true), new * Variant(57), new Variant(true), new Variant(true), new * Variant(true) },new int[1]); */ long date2 = new Date().getTime(); int time = (int) ((date2 - date) / 1000); Dispatch.call(excel, "Close", new Variant(false)); if (ax != null) { ax.invoke("Quit", new Variant[] {}); ax = null; } ComThread.Release(); return time; } catch (Exception e) { // TODO: handle exception return -1; } } /** * * @param text * @param pdf * @throws DocumentException * @throws IOException */ public static void text2pdf(String text, String pdf) throws DocumentException, IOException { Document document = new Document(); OutputStream os = new FileOutputStream(new File(pdf)); PdfWriter.getInstance(document, os); document.open(); //方法一：使用Windows系統字體(TrueType) BaseFont baseFont = BaseFont.createFont("C:\\Windows\\Fonts\\simhei.ttf", BaseFont.IDENTITY_H, BaseFont.NOT_EMBEDDED); Font font = new Font(baseFont); InputStreamReader isr = new InputStreamReader(new FileInputStream(new File(text)), "UTF-8"); BufferedReader bufferedReader = new BufferedReader(isr); String str = ""; while ((str = bufferedReader.readLine()) != null) { document.add(new Paragraph(str, font)); } document.close(); } /** * * @param filePath 待轉換文件的全路徑 * @param pdfPath 轉換后PDF存放路徑 */ public static void officeFileToPDF(String filePath, String pdfPath) throws Exception { if (filePath.endsWith(".doc") || filePath.endsWith(".docx")) { doc2pdf(filePath, pdfPath); } else if (filePath.endsWith(".xls") || filePath.endsWith(".xlsx")) { excel2Pdf(filePath, pdfPath); } else if (filePath.endsWith(".ppt") || filePath.endsWith(".pptx")) { ppt2pdf(filePath, pdfPath); }else if (filePath.endsWith(".txt")){ text2pdf(filePath,pdfPath); } } public static void main(String[] args) throws Exception { String path = "E:"; //officeFileToPDF(path + "OA時間安排.xlsx", path+ "OA時間安排.pdf"); int i = Ex2PDF(path + "OA時間安排.xlsx", path + "OA時間安排.pdf"); System.out.println(i); } }
4、office文件、文本文件轉成html
package com.pointlion.sys.mvc.admin.upload; import com.jacob.activeX.ActiveXComponent; import com.jacob.com.ComThread; import com.jacob.com.Dispatch; import com.jacob.com.Variant; import java.io.*; public class Jacob2Html { /** * PowerPoint轉成HTML * * @param pptPath PowerPoint文件全路徑 * @param htmlPath 轉換后HTML存放路徑 */ public static Boolean pptToHtml(String pptPath, String htmlPath) { Boolean b = false; ActiveXComponent offCom = new ActiveXComponent("PowerPoint.Application"); try { offCom.setProperty("Visible", new Variant(true)); Dispatch excels = offCom.getProperty("Presentations").toDispatch(); Dispatch excel = Dispatch.invoke( excels, "Open", Dispatch.Method, new Object[]{pptPath, new Variant(false), new Variant(false)}, new int[1]).toDispatch(); Dispatch.invoke(excel, "SaveAs", Dispatch.Method, new Object[]{ htmlPath, new Variant(12)}, new int[1]); Variant f = new Variant(false); Dispatch.call(excel, "Close", f); b = true; } catch (Exception e) { b = false; e.printStackTrace(); } finally { offCom.invoke("Quit", new Variant[]{}); ComThread.Release(); } return b; } public static boolean pptToHtml1(String s, String s1) { ComThread.InitSTA(); ActiveXComponent activexcomponent = new ActiveXComponent( "PowerPoint.Application"); String s2 = s; String s3 = s1; boolean flag = false; try { Dispatch dispatch = activexcomponent.getProperty("Presentations") .toDispatch(); Dispatch dispatch1 = Dispatch.call(dispatch, "Open", s2, new Variant(-1), new Variant(-1), new Variant(0)) .toDispatch(); Dispatch.call(dispatch1, "SaveAs", s3, new Variant(12)); Variant variant = new Variant(-1); Dispatch.call(dispatch1, "Close"); flag = true; } catch (Exception exception) { System.out.println("|||" + exception.toString()); } finally { activexcomponent.invoke("Quit", new Variant[0]); ComThread.Release(); ComThread.quitMainSTA(); } return flag; } /** * WORD轉成HTML * * @param wordPath WORD文件全路徑 * @param htmlPath 生成的HTML存放路徑 */ public static Boolean wordToHtml(String wordPath, String htmlPath) { Boolean b = false; ActiveXComponent offCom = new ActiveXComponent("Word.Application"); try { offCom.setProperty("Visible", new Variant(false)); Dispatch wordDis = offCom.getProperty("Documents").toDispatch(); Dispatch doc = Dispatch.invoke( wordDis, "Open", Dispatch.Method, new Object[]{wordPath, new Variant(true), new Variant(true)}, new int[1]).toDispatch(); Dispatch.invoke(doc, "SaveAs", Dispatch.Method, new Object[]{ htmlPath, new Variant(8)}, new int[1]); Variant f = new Variant(false); Dispatch.call(doc, "Close", f); b = true; } catch (Exception e) { b = false; e.printStackTrace(); } finally { offCom.invoke("Quit", new Variant[]{}); ComThread.Release(); } return b; } /** * EXCEL轉成HTML * * @param excelPath EXCEL文件全路徑 * @param htmlPath 轉換后HTML存放路徑 */ public static Boolean excelToHtml(String excelPath, String htmlPath) { Boolean b = false; ActiveXComponent offCom = new ActiveXComponent("Excel.Application"); try { offCom.setProperty("Visible", new Variant(false)); Dispatch excels = offCom.getProperty("Workbooks").toDispatch(); Dispatch excel = Dispatch.invoke( excels, "Open", Dispatch.Method, new Object[]{excelPath, new Variant(false), new Variant(true)}, new int[1]).toDispatch(); Dispatch.invoke(excel, "SaveAs", Dispatch.Method, new Object[]{ htmlPath, new Variant(44)}, new int[1]); Variant f = new Variant(false); Dispatch.call(excel, "Close", f); b = true; } catch (Exception e) { b = false; e.printStackTrace(); } finally { offCom.invoke("Quit", new Variant[]{}); ComThread.Release(); } return b; } /** * txt文檔轉html * @param filePath txt原文件路徑 * @param htmlPosition 轉化后生成的html路徑 * @return */ public static Boolean txtToHtml(String filePath, String htmlPosition) { Boolean b = false; try { String encoding = "GBK"; File file = new File(filePath); if (file.isFile() && file.exists()) { // 判斷文件是否存在 InputStreamReader read = new InputStreamReader(new FileInputStream(file), encoding); // 考慮到編碼格式 BufferedReader bufferedReader = new BufferedReader(read); // 寫文件 FileOutputStream fos = new FileOutputStream(new File(htmlPosition)); OutputStreamWriter osw = new OutputStreamWriter(fos, "UTF-8"); BufferedWriter bw = new BufferedWriter(osw); String lineTxt = null; while ((lineTxt = bufferedReader.readLine()) != null) { bw.write(lineTxt + "</br>"); } bw.close(); osw.close(); fos.close(); read.close(); b = true; } else { b = false; System.out.println("找不到指定的文件"); } } catch (Exception e) { System.out.println("讀取文件內容出錯"); e.printStackTrace(); }finally { } return b; } /** * EXCEL轉成HTML * * @param filePath 待轉換文件的全路徑 * @param htmlPath 轉換后HTML存放路徑 */ public static Boolean officeFileToHtml(String filePath, String htmlPath) { boolean isSuccess = false; if (filePath.endsWith(".doc") || filePath.endsWith(".docx")) { isSuccess = wordToHtml(filePath, htmlPath); } else if (filePath.endsWith(".xls") || filePath.endsWith(".xlsx")) { isSuccess = excelToHtml(filePath, htmlPath); } else if (filePath.endsWith(".ppt") || filePath.endsWith(".pptx")) { isSuccess = pptToHtml(filePath, htmlPath); }else if (filePath.endsWith(".txt")){ txtToHtml(filePath,htmlPath); } return isSuccess; } public static void main(String[] args) { String path = "E:\\"; String fileName = "OA時間安排.xlsx"; officeFileToHtml(path + "\\" + fileName, path + "\\" + "OA時間安排.html"); } }
五、總結：關鍵環境需要部署好，以及訪問的文件需要轉換成功，最后是加載路徑不能有誤。以上代碼，本人親測有效，也在使用
座右銘：好記性，不如爛筆頭！學到東西，記錄下來。
【原創：如需轉載，請注明出處！】