java实现在线预览word，excel,ppt文档

项目中遇到的word文档在线预览需求，查阅很多资料决定利用openoffice转换word文档为pdf进行预览实现。

1.下载openoffice4安装 www.openoffice.org；

2.导入相关jar包

3.openoffice服务启动

安装OpenOffice成功后，您可以进入/program/目录并运行以下命令启动OpenOffice服务：

soffice -headless -accept="socket,host=127.0.0.1,port=8100;urp;" -nofirststartwizard

4.openoffice转换文档代码，这是一个工具类，将要预览的文档进行转换

package org.neris.oltp.file.bo.impl;

import java.io.File;
import java.util.regex.Pattern;

import org.springframework.web.bind.annotation.RequestParam;

import com.artofsolving.jodconverter.openoffice.connection.OpenOfficeConnection;
import com.artofsolving.jodconverter.openoffice.connection.SocketOpenOfficeConnection;
//项目部署linux下因为远程服务启动的时候，host=真实的对外IP，不能写127.0.0.1。改成本地机器的IP地址即可。
public class ExchangePdf{


    public static String preview(@RequestParam String filePath, @RequestParam String fileName) {

        if(!"".equals(filePath)) {
            /*1)根据项目所在的服务器环境,确定路径中的 /  和 \ */
            String osName = System.getProperty("os.name");
            if (Pattern.matches("Linux.*", osName)) {
                filePath = "/" + filePath.replace("\\","/");
            } else if(Pattern.matches("Windows.*", osName)) {
                filePath.replace("/","\\");
            }

            /*2)获得文件名后缀*/
            String ext = "";
            if(!"".equals(fileName) && fileName.contains(".")){
                ext = fileName.substring(fileName.lastIndexOf(".") + 1, fileName.length()).toUpperCase();
            }

            /*利用openOffice将office文件转换为pdf格式, 然后预览doc, docx, xls, xlsx, ppt, pptx */
            if ("DOC".equals(ext) || "DOCX".equals(ext) || "XLS".equals(ext) || "XLSX".equals(ext) || "PPT".equals(ext) || "PPTX".equals(ext)) {
                /*filePath在数据库中是不带文件后缀的, 由于jodConverter必须要识别后缀,所以将服务器中的文件重命名为带后缀的文件*/
                File docFile = new File(filePath);
                /*File docFileWithExt = new File(filePath + "." + ext.toLowerCase()); //带后缀的文件
                docFile.renameTo(docFileWithExt);
                */
                /*转换之后的文件名*/
                File pdfFile;
                if(filePath.contains(".")){
                    pdfFile = new File(filePath.substring(0, filePath.lastIndexOf(".")) + ".pdf");
                }else{
                    pdfFile = new File(filePath + ".pdf");
                }

                /*判断即将要转换的文件是否真实存在*/
                if (docFile.exists()) {
                    /*判断改文件是否已经被转换过,若已经转换则直接预览*/
                    if (!pdfFile.exists()) {
                        /*打开OpenOffice连接,*/
                        OpenOfficeConnection connection = new SocketOpenOfficeConnection(8100);
                        try {

                            connection.connect();
                            //DocumentConverter converter = new OpenOfficeDocumentConverter(connection);
                            ConverterDocument converterDocument = new ConverterDocument(connection);
                            converterDocument.convert(docFile, pdfFile);
                            connection.disconnect();
                            filePath = pdfFile.getPath(); //文件转换之后的路径
                        } catch (java.net.ConnectException e) {
                            e.printStackTrace(); //openoffice 服务未启动
                        } catch (com.artofsolving.jodconverter.openoffice.connection.OpenOfficeException e) {
                            e.printStackTrace(); //读取转换文件失败
                            throw e;
                        } catch (Exception e) {
                            e.printStackTrace();
                            throw e;
                        }finally { //发生exception时, connection不会自动切断, 程序会一直挂着
                            try{
                                if(connection != null){
                                    connection.disconnect();
                                    connection = null;
                                }
                            }catch(Exception e){}
                        }
                    } else {
                        filePath = pdfFile.getPath(); //文件已经转换过
                        //response.setContentType("application/pdf");
                    }
                }
            }
        }
        return filePath;

    }
}

5：在转换excel时如果列数多的话会出现切行的情况：解决方案

package org.neris.oltp.file.bo.impl;

import com.artofsolving.jodconverter.openoffice.connection.OpenOfficeConnection;
import com.artofsolving.jodconverter.openoffice.converter.OpenOfficeDocumentConverter;
import com.artofsolving.jodconverter.openoffice.converter.StreamOpenOfficeDocumentConverter;
import com.sun.star.awt.Size;
import com.sun.star.beans.PropertyValue;
import com.sun.star.lang.XComponent;
import com.sun.star.uno.UnoRuntime;
import com.sun.star.view.PaperFormat;
import com.sun.star.view.PaperOrientation;
import com.sun.star.view.XPrintable;

public class ConverterDocument extends StreamOpenOfficeDocumentConverter  {
    public ConverterDocument(OpenOfficeConnection connection) {
        super(connection);
    }

    public final static Size A5, A4, A3;
    public final static Size B4, B5, B6;
    public final static Size KaoqinReport;

    static {
        A5 = new Size(14800, 21000);
        A4 = new Size(21000, 29700);
        A3 = new Size(29700, 42000);

        B4 = new Size(25000, 35300);
        B5 = new Size(17600, 25000);
        B6 = new Size(12500, 17600);

        KaoqinReport = new Size(29700, 27940);  //最大限度  宽 1600000
    }



    @Override
    protected void refreshDocument(XComponent document) {
        super.refreshDocument(document);

        // The default paper format and orientation is A4 and portrait. To
        // change paper orientation
        // re set page size
        XPrintable xPrintable = (XPrintable) UnoRuntime.queryInterface(XPrintable.class, document);
        PropertyValue[] printerDesc = new PropertyValue[2];

        // Paper Orientation
//          printerDesc[0] = new PropertyValue();
//          printerDesc[0].Name = "PaperOrientation";
//          printerDesc[0].Value = PaperOrientation.PORTRAIT;

        // Paper Format
        printerDesc[0] = new PropertyValue();
        printerDesc[0].Name = "PaperFormat";
        printerDesc[0].Value = PaperFormat.USER;

        // Paper Size
        printerDesc[1] = new PropertyValue();
        printerDesc[1].Name = "PaperSize";
        printerDesc[1].Value = KaoqinReport;

        try {
            xPrintable.setPrinter(printerDesc);
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

如果excel有多个sheet，只能对第一个sheet页面有效，其他sheet无效，如果哪位那位大神解决出来了，请告知。

小白第一次写文章，写的不好，如果有疑惑或建议请留言，谢谢。