springboot jodconverter openoffice 实现 office 文件 在线预览

这个已是好几个月前做的，好多细节已记得不那边清楚了。今天部署到环境还遇到不少问题。总结下。

1、office 文件实现在线预览的一般思路就是，将文件转pdf，在通过pdf.js 实现在线浏览。这其中转pdf 各个工具转换的效果有些差异，存在走样问题。

2、另一种思路是通过脚本调用office 的转换pdf功能，这种效果最好，高保真。但就是会麻烦些，依赖office 工具。

3、如果还要部署到Linux上使用哪就只能用开源的办公软件 openoffice 了。

4、jodconverter 能很好的调用openoffice 工具转换 配置也相对比较简单。

效果图：

springboot 默认集成了jodconverter 所有应用起来很方便

yml 中加入如下配置就可以了

jodconverter:
  enabled: true  #注意这个开关，今天部署时就遇到这个问题，排查好久才发现。
  officeHome: C:Program Files (x86)OpenOffice 4
  portNumbers: 8101,8102,8103,8104,8105
  maxTasksPerProcess: 5

核心代码：

  public boolean office2pdf(FileEntity fileEntity, String suffix) {
    LOG.info("call office to pdf ,file info:" + fileEntity.toString());
    File file = new File(fileEntity.getAbsolute_path());
    if (file.exists() && file.isFile()) {
      LOG.info("call office to pdf ,find file info:" + fileEntity.toString());
      try {
        File pdfFile = new File(file.getParentFile(), fileEntity.getPrn() + suffix);
        if (!pdfFile.exists()) {
          DocumentConverter documentConverter = szAppConfig.getBeanByClass(DocumentConverter.class);
          documentConverter.convert(file).to(pdfFile).execute();
          if (".html".equalsIgnoreCase(suffix)) {
            try {
              String htmlFormant =
                  "<script src="" + sz_ng_root_path + "/commons/js/333614537928.js"></script>
" +
                      "    <STYLE>
" +
                      "        
" +
                      "        BODY, DIV, TABLE, THEAD, TBODY, TFOOT, TR, TH, TD, P {
" +
                      "            font-family: "微软雅黑";
" +
                      "            font-size: x-small
" +
                      "        }
" +
                      "
" +
                      "        TABLE {
" +
                      "            margin: 0 auto;
" +
                      "            border-collapse: inherit;
" +
                      "        }
" +
                      "
" +
                      "        .tabBox {
" +
                      "            border-bottom: 1px solid #ccc;
" +
                      "            padding-bottom: 1px;
" +
                      "            height: 30px;
" +
                      "            line-height: 30px;
" +
                      "            color: #696969;
" +
                      "        }
" +
                      "
" +
                      "        .tabBox a {
" +
                      "            float: left;
" +
                      "            font-family: "微软雅黑";
" +
                      "            cursor: pointer;
" +
                      "            padding: 0px 25px 0px;
" +
                      "            font-size: 13px;
" +
                      "            height: 30px;
" +
                      "            line-height: 30px;
" +
                      "            background: #F4F5F9;
" +
                      "            border-top: 1px solid #C5D0DC;
" +
                      "            border-left: 1px solid #C5D0DC;
" +
                      "            border-bottom: 1px solid #C5D0DC;
" +
                      "        }
" +
                      "
" +
                      "        .tabBox a.current {
" +
                      "            border-bottom: 0px;
" +
                      "            border-top: 2px solid #7599DE;
" +
                      "            font-size: 13px;
" +
                      "            color: #343434;
" +
                      "            background: #FFFFFF;
" +
                      "
" +
                      "        }
" +
                      "
" +
                      "        .tabBox a:last-child {
" +
                      "            border-right: 1px solid #C5D0DC;
" +
                      "        }
" +
                      "
" +
                      "        .tabDetail {
" +
                      "            display: none;
" +
                      "        }
" +
                      "    </STYLE>
" +
                      "
" +
                      "
" +
                      "<script type="text/javascript">
" +
                      "    $(function () {
" +
                      "        var tabs = $("[href^='#table']");
" +
                      "        $("H1:contains('摘要')").remove();
" +
                      "        tabs.wrapAll("<p class=\"tabBox\"></p>");
" +
                      "        tabs.removeAttr("href");
" +
                      "        var tabContents = $("a[NAME]");
" +
                      "        tabContents.each(function () {
" +
                      "            var tcid = $(this).attr("name");
" +
                      "            var tc = $(this).next();
" +
                      "            var tcl = $(this).prev();
" +
                      "            $(this).wrap("<div class=\"tabDetail\"></div>")
" +
                      "            tc.appendTo($(this).parent());
" +
                      "            tcl.appendTo($(this).parent());
" +
                      "        });
" +
                      "    });
" +
                      "    $(function () {
" +
                      "        $($('.tabBox > a')[0]).attr("class","current");
" +
                      "        $($('.tabDetail')[0]).show();
" +
                      "        $('.tabBox > a').on("click",function(){
" +
                      "            var num=$(this).index();
" +
                      "            console.log(num)
" +
                      "            $('.tabBox > a').each(function(){
" +
                      "                if($(this).index()==num){
" +
                      "                    $(this).attr("class","current");
" +
                      "                    $('.tabDetail').hide();
" +
                      "                    $($('.tabDetail')[num]).show();
" +
                      "                }else{
" +
                      "                    $(this).attr("class","");
" +
                      "                }
" +
                      "            });
" +
                      "        });
" +
                      "    });
" +
                      "</script>
" +
                      "</HTML>";
              RandomAccessFile raf = new RandomAccessFile(pdfFile.getAbsolutePath(), "rw");
              long lastPoint = 0; //记住上一次的偏移量
              String line = null;
              while ((line = raf.readLine()) != null) {
                final long ponit = raf.getFilePointer();
                if (line.toUpperCase().contains("</HTML>")) {
                  String str = line.toUpperCase().replace("</HTML>", htmlFormant);
                  raf.seek(lastPoint);
                  raf.write(str.getBytes("gb2312"));
                }
                lastPoint = ponit;
              }
              raf.close();
            } catch (IOException e) {
              e.printStackTrace();
            }
          }
          LOG.info("call office to pdf ,convert over. file info:" + fileEntity.toString());
        }
        return true;
      } catch (OfficeException e) {
        e.printStackTrace();
        LOG.info(
            "call office to pdf ,thrown error info:" + e.toString() + ", file info:" + fileEntity
                .toString());
        return false;
      }
    }
    return false;
  }

上面有一个任意读写文件，是为了加入自定已的js 来控制excle 的展示样式。反正当时纠结了好久。

pom：

<!--open office-->
  <dependency>
   <groupId>org.jodconverter</groupId>
   <artifactId>jodconverter-core</artifactId>
   <version>4.1.0</version>
  </dependency>
  <dependency>
   <groupId>org.jodconverter</groupId>
   <artifactId>jodconverter-local</artifactId>
   <version>4.1.0</version>
  </dependency>
  <dependency>
   <groupId>org.jodconverter</groupId>
   <artifactId>jodconverter-spring-boot-starter</artifactId>
   <version>4.1.0</version>
  </dependency>
  <dependency>
   <groupId>org.libreoffice</groupId>
   <artifactId>juh</artifactId>
   <version>5.4.2</version>
  </dependency>
  <dependency>
   <groupId>org.libreoffice</groupId>
   <artifactId>jurt</artifactId>
   <version>5.4.2</version>
  </dependency>
  <dependency>
   <groupId>org.libreoffice</groupId>
   <artifactId>ridl</artifactId>
   <version>5.4.2</version>
  </dependency>
  <dependency>
   <groupId>org.libreoffice</groupId>
   <artifactId>unoil</artifactId>
   <version>5.4.2</version>
  </dependency>
  <dependency>
   <groupId>org.libreoffice</groupId>
   <artifactId>unoloader</artifactId>
   <version>5.4.2</version>
  </dependency>

代码就这么些着实有些简洁，却实现了一个看着不那么容易的功能。