基于Hadoop实现的好友推荐系统源码+文档说明（毕业设计）

/** * */ package com.kang.util; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.FileNotFoundException; import java.io.FileWriter; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.util.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.HashMap; import java.util.List; import java.util.Map; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.FileStatus; import org.apache.hadoop.fs.FileSystem; import org.apache.hadoop.fs.FileUtil; import org.apache.hadoop.fs.LocatedFileStatus; import org.apache.hadoop.fs.Path; import org.apache.hadoop.fs.RemoteIterator; import org.apache.hadoop.io.DoubleWritable; import org.apache.hadoop.io.IOUtils; import org.apache.hadoop.io.IntWritable; import org.apache.hadoop.io.SequenceFile; import org.apache.hadoop.io.SequenceFile.Reader; import org.apache.hadoop.io.SequenceFile.Writer; import org.apache.hadoop.io.SequenceFile.Writer.Option; import org.apache.hadoop.io.Text; import org.apache.hadoop.io.Writable; import org.apache.hadoop.io.WritableUtils; import org.apache.hadoop.mapred.JobClient; import org.apache.hadoop.mapred.JobStatus; import org.apache.hadoop.util.ReflectionUtils; import com.kang.fastcluster.keytype.DoubleArrStrWritable; import com.kang.fastcluster.keytype.DoublePairWritable; import com.kang.fastcluster.keytype.IntDoublePairWritable; import com.kang.filter.keytype.DoubleArrIntWritable; import com.kang.model.CurrentJobInfo; import com.kang.model.UserData; import com.kang.model.UserGroup; /** * Hadoop 工具类 * */ public class HUtils { public static final double VERYSMALL = 0.00000000000000000000000000001; // pre filter // 最原始user.xml文件在HDFS上的存储路径 public static final String SOURCEFILE = "/user/root/_source/source_users.xml"; // 过滤文件夹 public static final String FILTER = "/user/root/_filter"; public static final String FILTER_DEDUPLICATE = FILTER + "/" + "deduplicate"; public static final String FILTER_GETATTRIBUTES = FILTER + "/" + "getattributes";// 属性提取 public static final String FILTER_GETMAXMIN = FILTER + "/" + "getmaxmin";// 获得列最大最小值 public static final String FILTER_NORMALIZATION = FILTER + "/" + "normalization";// 归一化 public static final String FILTER_FINDINITDC = FILTER + "/" + "findinitdc";// 寻找dc阈值 public static final String FILTER_PREPAREVECTORS = FILTER + "/" + "preparevectors";// 准备距离向量 public static final int FILTER_PREPAREVECTORS_FILES = 4;// 由数据库到hdfs产生的文件数 public static final String FILTER_CALDISTANCE = FILTER + "/" + "caldistance";// 计算向量之间的距离 public static final String DEDUPLICATE_LOCAL = "WEB-INF/classes/deduplicate_users.xml"; public static final String LOCALCENTERFILE="WEB-INF/classes/centervector.dat";// 本地中心点文件 public static final String MAP_COUNTER = "MAP_COUNTER"; public static final String REDUCE_COUNTER = "REDUCE_COUNTER"; public static final String REDUCE_COUNTER2 = "REDUCE_COUNTER2"; public static final String DOWNLOAD_EXTENSION = ".dat";// 下载文件的后缀名 public static double DELTA_DC = 0.0;// DC阈值， public static long INPUT_RECORDS = 0L;// 文件全部记录数，任务FindInitDCJob任务后对此值进行赋值 // 聚类分类 public static long CLUSTERED=-1; public static long UNCLUSTERED=-1; // fast cluster public static final String LOCALDENSITYOUTPUT = "/user/root/localdensity"; public static final String DELTADISTANCEOUTPUT = "/user/root/deltadistance"; public static final String DELTADISTANCEBIN = "/user/root/deltadistance.bin";// 局部密度最大向量id存储路径 public static final String SORTOUTPUT = "/user/root/sort"; public static final String FIRSTCENTERPATH = "/user/root/_center/iter_0/clustered/part-m-00000"; public static final String FIRSTUNCLUSTEREDPATH = "/user/root/_center/iter_0/unclustered"; public static final String CENTERPATH = "/user/root/_center"; public static final String CENTERPATHPREFIX = "/user/root/_center/iter_"; private static Configuration conf = null; private static FileSystem fs = null; public static boolean flag = true; // get configuration from db or file // ,true : db,false:file public static int JOBNUM = 1; // 一组job的个数 // 第一个job的启动时间阈值，大于此时间才是要取得的的真正监控任务 private static long jobStartTime = 0L;// 使用 System.currentTimeMillis() 获得 private static JobClient jobClient = null; public static Configuration getConf() { if (conf == null) { conf = new Configuration(); // get configuration from db or file conf.setBoolean("mapreduce.app-submission.cross-platform", "true" .equals(Utils.getKey( "mapreduce.app-submission.cross-platform", flag)));// 配置使用跨平台提交任务 conf.set("fs.defaultFS", Utils.getKey("fs.defaultFS", flag));// 指定namenode conf.set("mapreduce.framework.name", Utils.getKey("mapreduce.framework.name", flag)); // 指定使用yarn框架 conf.set("yarn.resourcemanager.address", Utils.getKey("yarn.resourcemanager.address", flag)); // 指定resourcemanager conf.set("yarn.resourcemanager.scheduler.address", Utils.getKey( "yarn.resourcemanager.scheduler.address", flag));// 指定资源分配器 conf.set("mapreduce.jobhistory.address", Utils.getKey("mapreduce.jobhistory.address", flag)); } return conf; } public static FileSystem getFs() { if (fs == null) { try { fs = FileSystem.get(getConf()); } catch (IOException e) { e.printStackTrace(); } } return fs; } /** * 获取hdfs文件目录及其子文件夹信息 * * @param input * @param recursive * @return * @throws IOException */ public static String getHdfsFiles(String input, boolean recursive) throws IOException { RemoteIterator<LocatedFileStatus> files = getFs().listFiles( new Path(input), recursive); StringBuffer buff = new StringBuffer(); while (files.hasNext()) { buff.append(files.next().getPath().toString()).append("<br>"); } return buff.toString(); } /** * 根据时间来判断，然后获得Job的状态，以此来进行监控 Job的启动时间和使用system.currentTimeMillis获得的时间是一致的， * * * @return * @throws IOException */ public static List<CurrentJobInfo> getJobs() throws IOException { JobStatus[] jss = getJobClient().getAllJobs();//返回所有的Job，不管是失败还是成功的 List<CurrentJobInfo> jsList = new ArrayList<CurrentJobInfo>(); jsList.clear(); for (JobStatus js : jss) { if (js.getStartTime() > jobStartTime) {//只查找任务启动时间在jobStartTime之后的任务 jsList.add(new CurrentJobInfo(getJobClient().getJob( js.getJobID()), js.getStartTime(), js.getRunState())); } } Collections.sort(jsList); return jsList; } public static void printJobStatus(JobStatus js) { System.out.println(new java.util.Date() + ":jobId:" + js.getJobID().toString() + ",map:" + js.getMapProgress() + ",reduce:" + js.getReduceProgress() + ",finish:" + js.getRunState()); } /** * @return the jobClient */ public static JobClient getJobClient() { if (jobClient == null) { try { jobClient = new JobClient(getConf()); } catch (IOException e) { e.printStackTrace(); } } return jobClient; } /** * @param jobClient * the jobClient to set */ public static void setJobClient(JobClient jobClient) { HUtils.jobClient = jobClient; } public static long getJobStartTime() { return jobStartTime; } public static void setJobStartTime(long jobStartTime) { HUtils.jobStartTime = jobStartTime; } /** * 判断一组MR任务是否完成 * * @param currentJobInfo * @return */ public static String hasFinished(CurrentJobInfo currentJobInfo) { if (currentJo