java - 将标签云添加到 OpenCMS 网站

Question

我正在一个基于 OpenCMS 的内联网网站上工作，我想在网站中包含一个标签云。我找到了一些开源的 tagcloud java 库(比如 OpenCloud)。您有将这两个(或其他 tagcloud 库+OpenCMS)连接在一起的经验吗？

Answer 1

好的，最后我自己部分解决了这个问题。我还使用了 Richard Friedman 的 tag cloud 中的一些代码.

我这样做的方式如下:在指定的时间间隔内，OpenCMS 运行一个预定的作业来读取 Lucene 索引，从“关键字”字段中提取所有术语(可以为 VFS 中的每个文件填写)，生成标签云并将结果存储在一个文件中，该文件是我的 OpenCMS 模板的一部分。有两个 Java 文件:Cloud.java 和 BuildTagCloud.java。 “云”读取索引并返回最常用术语的列表。 “BuildTagCloud”实现 I_CmsScheduledJob 接口(interface)并注册为计划作业。

BuildTagCloud.java:

package mypackage;

import org.opencms.file.*;
import org.opencms.main.*;
import org.opencms.scheduler.I_CmsScheduledJob;
import java.text.SimpleDateFormat;
import java.util.*;


public class BuildTagCloud implements I_CmsScheduledJob {

  private final String indexaddress = "address/of/your/index/folder"; // something like ../webapps/opencms/WEB-INF/index/nameOfIndex
  private final String tagsFile = "address"; // part of my template; it's where I store the tag cloud
  private final int numTerms = 10; // number of terms in the tag cloud                                                                   


  public String launch(CmsObject object, java.util.Map parameters) throws java.lang.Exception {
      Cloud cloud = new Cloud(indexaddress, numTerms);

      Calendar cal = Calendar.getInstance();
      SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
      String data;
      data = "<div style=\"border-top: 3px solid #000099; padding-top: 6px; margin-top: 17px;\"><span style=\"font-weight: bold; font-size: 11px; color: #000099;\">Tag cloud</span><br />";
      data += sdf.format(cal.getTime()) + "<br />";

      try {
          List<TermInfo> list = cloud.getCloud();

          for(int i = 0; i<list.size(); i++) {
              data += "<br />" + i + ". " + list.get(i).term.text() + " ... " + list.get(i).docFreq; // list.get(i).docFreq
          }

      } catch (Exception e) {

          data += e.getMessage();
          data += "<br />";

      } finally {

          data+="</div>";
      }

      writeAndPublishResource(object, tagsFile, data);

      return "OK";
  }

  private void writeAndPublishResource(CmsObject object, String resouce, String data) throws java.lang.Exception {
      object.loginUser("administrator's user name", "and his password");

      CmsRequestContext cmsContext = object.getRequestContext();
      CmsProject curProject = cmsContext.currentProject();

      if(curProject.isOnlineProject()){
            CmsProject offlineProject = object.readProject("Name of the project");
            cmsContext.setCurrentProject(offlineProject);
      }
      CmsResource res = object.readResource(resouce);
      object.lockResource(resouce);
      CmsFile file = object.readFile(res);
      file.setContents(data.getBytes());
      object.writeFile(file);
      OpenCms.getPublishManager().publishResource(object, resouce);
      object.unlockResource(resouce);  
  }

}

云.java:

package mypackage;

import java.io.*;
import java.util.*;
import org.apache.lucene.index.*;

public class Cloud {

    private String indexaddress;
    private int numTerms;

    private int max;
    private int sum;

    public Cloud(String indexaddress, int numTerms) {
        this.indexaddress = indexaddress;
        this.numTerms = numTerms;
        max = 0;
        sum = 0;
    }

    public List<TermInfo> getCloud() throws Exception {

        TermInfoQueue termQ = new TermInfoQueue(numTerms);

        IndexReader reader = IndexReader.open(new File(indexaddress));
        TermEnum terms = reader.terms();



        int minFreq = 0;
        while (terms.next()) {

            if (!terms.term().field().equals("keywords")) continue;

            if ( terms.docFreq() > minFreq) {
                if (termQ.size() >= numTerms)            // if tiq overfull
                {
                    termQ.pop();                 // remove lowest in tiq
                    termQ.put(new TermInfo(terms.term(), terms.docFreq()));
                    minFreq = ((TermInfo)termQ.top()).docFreq; // reset minFreq
                } else {
                    termQ.put(new TermInfo(terms.term(), terms.docFreq()));
                }
            }
        }

        terms.close();
        reader.close();

        ArrayList<TermInfo> res = new ArrayList<TermInfo>( termQ.size() );
        while ( termQ.size() > 0 ) {
            TermInfo ti = (TermInfo)termQ.pop();
            max = Math.max( max, ti.docFreq );
            sum += ti.docFreq;
            res.add( ti );
        }

        // Shuffles the results up, since a sorted cloud would be predictiable.
        //Collections.shuffle( res );

        return res;
      }

      public int getMaxFrequency() {
          return max;
      }
}

class TermInfo {

    TermInfo(Term t, int df) {
        term = t;
        docFreq = df;
    }

    public int docFreq;
    public Term term;
}

class TermInfoQueue extends org.apache.lucene.util.PriorityQueue {

    TermInfoQueue(int size) {
        initialize(size);
    }

    protected final boolean lessThan(Object a, Object b) {
        TermInfo termInfoA = (TermInfo)a;
        TermInfo termInfoB = (TermInfo)b;
        return termInfoA.docFreq < termInfoB.docFreq;
    }
}

希望这可以帮助别人，因为我花了很多时间才弄明白!