Example #1
0
  public static XYSeries getXY(String url) {
    XYSeries xyseries = new XYSeries("");

    Path path = new Path(url);
    Configuration conf = HUtils.getConf();
    SequenceFile.Reader reader = null;
    try {
      reader =
          new SequenceFile.Reader(
              conf, Reader.file(path), Reader.bufferSize(4096), Reader.start(0));
      DoubleArrStrWritable dkey =
          (DoubleArrStrWritable) ReflectionUtils.newInstance(reader.getKeyClass(), conf);
      DoublePairWritable dvalue =
          (DoublePairWritable) ReflectionUtils.newInstance(reader.getValueClass(), conf);

      while (reader.next(dkey, dvalue)) { // 循环读取文件
        xyseries.add(dvalue.getFirst(), dvalue.getSecond());
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      IOUtils.closeStream(reader);
    }
    return xyseries;
  }
Example #2
0
  /**
   * return the x*y
   *
   * @param url
   * @return
   */
  public Double[] getR(String url) {
    List<Double> list = new ArrayList<Double>();
    Path path = new Path(url);
    Configuration conf = HUtils.getConf();
    SequenceFile.Reader reader = null;
    try {
      reader =
          new SequenceFile.Reader(
              conf, Reader.file(path), Reader.bufferSize(4096), Reader.start(0));
      DoubleArrStrWritable dkey =
          (DoubleArrStrWritable) ReflectionUtils.newInstance(reader.getKeyClass(), conf);
      DoublePairWritable dvalue =
          (DoublePairWritable) ReflectionUtils.newInstance(reader.getValueClass(), conf);

      while (reader.next(dkey, dvalue)) { // 循环读取文件
        //				list.add(dvalue.getSum()*dvalue.getDistance());
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      IOUtils.closeStream(reader);
    }
    Double[] dList = new Double[list.size()];
    dList = list.toArray(dList);
    Arrays.sort(dList);
    return dList;
  }
Example #3
0
  private static List<IDistanceDensityMul> getIDistanceDensityMulList(String url)
      throws FileNotFoundException, IOException {
    Configuration conf = HUtils.getConf();
    SequenceFile.Reader reader = null;
    // 多个文件整合,需排序
    List<IDistanceDensityMul> allList = new ArrayList<IDistanceDensityMul>();
    // 单个文件
    List<IDistanceDensityMul> fileList = new ArrayList<IDistanceDensityMul>();

    FileStatus[] fss =
        HUtils.getHDFSPath(url, "true")
            .getFileSystem(conf)
            .listStatus(HUtils.getHDFSPath(url, "true"));
    for (FileStatus f : fss) {
      if (!f.toString().contains("part")) {
        continue; // 排除其他文件
      }
      try {
        reader =
            new SequenceFile.Reader(
                conf, Reader.file(f.getPath()), Reader.bufferSize(4096), Reader.start(0));
        //				 <density_i*min_distancd_j> <first:density_i,second:min_distance_j,third:i>
        //				 	DoubleWritable,  IntDoublePairWritable
        CustomDoubleWritable dkey =
            (CustomDoubleWritable) ReflectionUtils.newInstance(reader.getKeyClass(), conf);
        IntDoublePairWritable dvalue =
            (IntDoublePairWritable) ReflectionUtils.newInstance(reader.getValueClass(), conf);
        int i = Utils.GETDRAWPICRECORDS_EVERYFILE;
        while (reader.next(dkey, dvalue) && i > 0) { // 循环读取文件
          i--;
          fileList.add(
              new IDistanceDensityMul(
                  dvalue.getSecond(),
                  dvalue.getFirst(),
                  dvalue.getThird(),
                  dkey.get())); // 每个文件都是从小到大排序的
        }
      } catch (Exception e) {
        e.printStackTrace();
      } finally {
        IOUtils.closeStream(reader);
      }

      // 整合当前文件的前面若干条记录(Utils.GETDRAWPICRECORDS_EVERYFILE 	)
      if (allList.size() <= 0) { // 第一次可以全部添加
        allList.addAll(fileList);
      } else {
        combineLists(allList, fileList);
      }
    } // for
    // 第一个点太大了,选择去掉
    return allList.subList(1, allList.size());
  }