基于java的推荐系统实现源代码

常用推荐算法java实现~涉及多种相似度计算，比如cosine相似度，欧氏距离等~ (recommand algirithm )

package iweb2.ch3.collaborative.cache;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.objectInputStream;
import java.io.objectOutputStream;

/**
 * Implementation of Store interface. Uses files to store objects
 * using java serialization. Each object instance is stored in a separate file.
 */
public class FileStore implements Store {

    private File dataDir;
    
    /**
     * Creates a new instance that will use specified directory to store objects.
     * 
     * @param dir directory that should be used to store/retrieve objects. 
     */
    public FileStore（String dir） {
        this（new File（dir））;
    }
    
    public FileStore（File dir） {
        if（ !dir.exists（） ） {
            dir.mkdirs（）;
        }
        this.dataDir = dir;
    }
    
    public boolean exists（String key） {
        File f = getFile（key）;
        return f.exists（）;
    }

    public object get（String key） {
      object o = null;
      try {
          File f = getFile（key）;
          if（ f.exists（） ） {
              FileInputStream fInStream = new FileInputStream（f）;
              BufferedInputStream bufInStream = new BufferedInputStream（fInStream）;
              objectInputStream objInStream = new objectInputStream（bufInStream）;
              o = objInStream.readobject（）;
              objInStream.close（）;
          }
      }
      catch（Exception e） {
          throw new RuntimeException（“Error while loading data from file （dir: ‘“ + dataDir + “‘ filename: ‘“ + key +“‘）.“ e）;            
      }
      return o;
    }

    public void put（String key object o） {
      try {
          File f = getFile（key）;
          FileOutputStream foutStream = new FileOutputStream（f）;
          BufferedOutputStream boutStream = new BufferedOutputStream（foutStream）;
          objectOutputStream objOutputStream = new objectOutputStream（boutStream）;
          objOutputStream.writeobject（o）;
          objOutputStream.flush（）;
          boutStream.close（）;
      }
      catch（IOException e） {
          throw new RuntimeException（“Error while saving data into file （dir: ‘“ + dataDir + “‘ filename: ‘“ + key +“‘）.“ e）;         
      }
    }
    
    public void remove（String key） {
        File f = getFile（key）;
        if（ f.exists（） ） {
            f.delete（）;
        }
    }

    /*
     * Derives filename from the key and returns instance of File
     */
    private File getFile（String key） {
        // key is used as a filename
        return new File（dataDir key + “.tmp“）;
    }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2014-03-23 21:12  Recommend\
     目录           0  2014-03-23 21:12  Recommend\src\
     目录           0  2014-03-23 21:11  Recommend\src\collaborative\
     目录           0  2014-03-23 21:11  Recommend\src\collaborative\cache\
     文件        2770  2010-04-30 10:42  Recommend\src\collaborative\cache\FileStore.java
     文件         898  2010-04-30 10:42  Recommend\src\collaborative\cache\Store.java
     目录           0  2014-03-23 21:11  Recommend\src\collaborative\data\
     文件       11755  2010-04-30 10:42  Recommend\src\collaborative\data\baseDataset.java
     文件         702  2010-04-30 10:42  Recommend\src\collaborative\data\ContentItem.java
     文件       12550  2010-04-30 10:42  Recommend\src\collaborative\data\DiggData.java
     文件        2174  2010-04-30 10:42  Recommend\src\collaborative\data\HTMLContent.java
     文件        1745  2011-01-19 14:34  Recommend\src\collaborative\data\MovieLensData.java
     文件       11574  2010-04-30 10:42  Recommend\src\collaborative\data\MovieLensDataset.java
     文件        9630  2010-04-30 10:42  Recommend\src\collaborative\data\MusicData.java
     文件         707  2010-04-30 10:42  Recommend\src\collaborative\data\MusicItem.java
     文件         393  2010-04-30 10:42  Recommend\src\collaborative\data\MusicRating.java
     文件        7160  2010-10-07 16:06  Recommend\src\collaborative\data\MusicUser.java
     文件        6370  2010-04-30 10:42  Recommend\src\collaborative\data\NewsData.java
     文件         549  2010-04-30 10:42  Recommend\src\collaborative\data\NewsItem.java
     文件         875  2010-04-30 10:42  Recommend\src\collaborative\data\NewsUser.java
     文件        1718  2010-04-30 10:42  Recommend\src\collaborative\data\RatingBuilder.java
     目录           0  2014-03-23 21:11  Recommend\src\collaborative\evaluation\
     文件         379  2010-04-30 10:42  Recommend\src\collaborative\evaluation\EvaluationDataProvider.java
     文件        8477  2010-04-30 10:42  Recommend\src\collaborative\evaluation\MovieLensEvaluationDataProvider.java
     文件        2202  2011-01-19 18:17  Recommend\src\collaborative\evaluation\MovieLensRMSE.java
     文件        5521  2011-01-19 11:04  Recommend\src\collaborative\evaluation\RMSEEstimator.java
     文件        1353  2010-04-30 10:42  Recommend\src\collaborative\evaluation\RMSEResult.java
     目录           0  2014-03-23 21:11  Recommend\src\collaborative\model\
     文件        4787  2010-04-30 10:42  Recommend\src\collaborative\model\Content.java
     文件        2517  2010-04-30 10:42  Recommend\src\collaborative\model\Dataset.java
     文件        3888  2010-04-30 10:42  Recommend\src\collaborative\model\Item.java
............此处省略41个文件信息