MapReduce 編程練手

1：資料集。http://earthquake.usgs.gov/earthquakes/eqarchives/epic/epic_global.php

PDE    1973  01 12 115656     37.93  -90.52  20  3.2 LgSLM   4F. .......       PDE    1973  01 30 071636.60 -17.56  167.85   3              3F. .......       PDE    1973  02 04 091042.20  -3.76  151.96  19              3F. .......       PDE    1973  02 15 230608.90  36.81 -115.90   4              3F. .......       PDE    1973  02 15 231457.10  36.81 -115.91   4              3F. .......       PDE    1973  02 20 113848.80  45.01   36.41  17  4.2 mbGS    4F. .......       PDE    1973  02 21 144557.30  34.06 -119.04   8  5.9 MLPAS   7C. .......       PDE    1973  02 25 100944.80  34.73  132.34  19  4.2 mbGS    3F. .......       PDE    1973  02 28 082132.30  39.72  -75.44  14  3.8 LgSLM   6F. .......       PDE    1973  03 09 190912.80 -34.13  150.27  13  5.5 mbGS    6D. .......       PDE    1973  03 10 095000.30 -15.18 -173.52   8  5.6 mbGS    2F. .......       PDE    1973  03 22 211309.60  -5.47  151.27  18  4.9 mbGS    2F. .......       PDE    1973  03 24 003436.80  31.72  139.30  20  5.9 UKBRK   2F. .......       PDE    1973  03 29 175152.40  36.10  141.55  15  3.9 mbGS    2F. .......       PDE    1973  04 05 043208.10  11.94  122.50   6  5.4 mbGS    4F. .......       PDE    1973  04 07 193006.90  41.49   19.98  16  4.7 mbGS    6F. .......       PDE    1973  04 11 051218.10  64.61 -160.05  15  4.2 mbGS    5F. .......       PDE    1973  04 11 120610     38.81  140.80  15  4.4 mbGS    2F. .......       PDE    1973  04 13 144032.60  41.84   22.72   5              4F. .......       PDE    1973  04 29 143753.90  34.64   -4.07  19  4.6 mbGS    6F. .......       PDE    1973  05 05 074058.10  40.89  140.31  17  5.1 mbGS    6F. .......       PDE    1973  05 12 140502.80  -3.94  152.06  14  5.6 mbGS    3F. .......       PDE    1973  05 12 162009.20  -3.73  152.08  13  6.0 UKPAS   5F. .......      

2：代碼：

package com.mojia.mr.demo;public class Parser {private String line;public Parser(String line) {this.line = line;}public String getYear() {int index = line.indexOf("PDE");String year = line.substring(index + 7, index + 11);return year;}public boolean isBig() {String[] strs = line.split(" ");String temp = "";for (String str : strs) {if (str.contains("F.") || str.contains("D.") || str.contains("M.")|| str.contains("CM") || str.contains("FM")|| str.contains(".M")) {temp = str;}}if (temp.equals("")) {System.out.println("temp=" + temp);String leverStr = "";if (temp.endsWith("F.")) {leverStr = temp.replace("F.", "");} else if (temp.endsWith("F")) {leverStr = temp.replace("F", "");}int lever = -1;try {lever = Integer.parseInt(leverStr);} catch (Exception e) {System.out.println("format error");}if (lever >= 4) {return true;}}return false;}}

3： 圖表展示

見下面圖形。X軸表示時間1980--2009