本文主要是介绍电话归属地查询之Android解决方案，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
http://blog.zhourunsheng.com
最近接触的一个项目中，其中有一个功能需求就是号码归属地的查询，乍一看确实挺简单，反正数据库也都有了，只不过就是查询一下而已嘛！到了实际程序设计的时候才发现，5M的数据库光要加载起来就得1分多钟，放在android手机上跑的太慢了，没办法，只好另辟蹊径了！！！
本文的基本思路如下：
1. 先把数据进行分组，即每一个地区一个组，例如
1898742 1898743 1898744 :云南曲靖
1894380 1894381 1894382 :吉林松原
2. 把电话号码进行排序，目的就是为了找到电话号码的区间，例如
1894815 --> 1899819 :广东珠海，
找到了一个区段，这样就不用把每个电话号码读存储下来， 只要存储一个区间就好，
这样可以大大节省存储空间
3. 设计新的存储格式，本文的程序采用如下方式存储
| 第一条电话记录在文件中的位置偏移 | 最后一条电话记录在文件中的位置偏移 |
| 电话归属地的字符串（例如：辽宁大连，湖北武汉，广东珠海，广东深圳..., 字符串之间以逗号分隔） | |
| 第一条电话记录 （例如：1894815{代表号码段起始值} 5{代表连续的号码个数} 2{代表该归属地字符串在所有归属地字符串中的偏移量}） | |
| 第二条电话记录 | |
| ... | |
| 最后一条电话记录 | |
4. 归属地查询
根据用户输入的电话号码，利用二分查找法可快速定位到该记录在文件中的位置偏移，读出该记录中位置字符串的偏移值，进而查表即可找到归属地
程序设计，源码如下：
package com.carey.tel;
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;public class JavaTelArea {private static JavaTelArea jta = null;private static final String INDEXDATAFILE = "tel.bin";private static Hearder cacheHearder = null;private static AreaCode cacheAreaCode = null;private static String cacheIndexFilePath = null;public static void main(String[] args) {JavaTelArea ctc = JavaTelArea.getInstance();//ctc.genIndexFile("e:\", "e:\telphone.txt");String indexPath = "e:\";long startTime = new Date().getTime();String searchNum = "13889650920";String res = ctc.searchTel(indexPath, searchNum);System.out.println(searchNum + " : " + res);System.out.println(System.currentTimeMillis() - startTime + "ms");startTime = new Date().getTime();searchNum = "+8613659867583";res = ctc.searchTel(indexPath, searchNum);System.out.println(searchNum + " : " + res);System.out.println(System.currentTimeMillis() - startTime + "ms");startTime = new Date().getTime();searchNum = "1301815";res = ctc.searchTel(indexPath, searchNum);System.out.println(searchNum + " : " + res);System.out.println(System.currentTimeMillis() - startTime + "ms");startTime = new Date().getTime();searchNum = "1301816";res = ctc.searchTel(indexPath, searchNum);System.out.println("没有预测");System.out.println(searchNum + " : " + res);System.out.println(System.currentTimeMillis() - startTime + "ms");startTime = new Date().getTime();searchNum = "1301816";res = ctc.searchTel(indexPath, searchNum, true);System.out.println("根据号码连贯性原理预测");System.out.println(searchNum + " : " + res);System.out.println(System.currentTimeMillis() - startTime + "ms");startTime = new Date().getTime();searchNum = "1301817";res = ctc.searchTel(indexPath, searchNum);System.out.println(searchNum + " : " + res);System.out.println(System.currentTimeMillis() - startTime + "ms");}private HashMap<Long, String> generateTestData() {HashMap<Long, String>telToAreaCode = new HashMap<Long, String>();telToAreaCode.put(1310944l, "新疆伊犁州");telToAreaCode.put(1301263l, "新疆伊犁州");telToAreaCode.put(1301264l, "新疆伊犁州");telToAreaCode.put(1301260l, "新疆伊犁州");telToAreaCode.put(955L, "海南");telToAreaCode.put(1320955l, "海南");telToAreaCode.put(1320957l, "海南");telToAreaCode.put(1300561L, "陕西商州");telToAreaCode.put(1300562L, "陕西商州");return telToAreaCode;}public static synchronized JavaTelArea getInstance() {if (jta == null) {jta = new JavaTelArea();}return jta;}/** * Generate Index File (tel.bin) * */private void genIndexFile(String indexFilePath, String souceFile) {ArrayList<String> strs = readFileToList(souceFile);HashMap<Long, String>telToArea = createTel2AreaHashMap(strs);writeDate(indexFilePath + INDEXDATAFILE, telToArea);}/** * read file content to String array list, every line one string. * */private ArrayList<String> readFileToList(String filePath) {final ArrayList<String>strLists = new ArrayList<String>();BufferedReader bReader = null;try {bReader = new BufferedReader(new InputStreamReader(new FileInputStream(filePath)));String str = bReader.readLine();while (str != null) {strLists.add(str);str = bReader.readLine();}} catch (Exception e) {e.printStackTrace();} finally {if (bReader != null) {try {bReader.close();} catch (IOException e) {e.printStackTrace();}}}return strLists;}/** * create telephone number to area hash map. * */HashMap<Long, String> createTel2AreaHashMap(ArrayList<String> strs) {final HashMap<Long, String>telToArea = new HashMap<Long, String>();String[] tels = null;int len = 0;String strArea = null;for (String string : strs) {tels = string.split(" ");len = tels.length;strArea = tels[len - 1].substring(1);for (int i = 0; i < len - 1; i++) {telToArea.put(Long.valueOf(tels[i]), strArea);}}return telToArea;}/** * combined the adjacent Records. * */private void combinedRecords(ArrayList<Record> records, Record newRecord) {int size = records.size();if (size > 0&& records.get(size - 1).areacodeIndex == newRecord.areacodeIndex) {// combinedRecord lastRecord = records.get(size - 1);lastRecord.numCnt = (int) (newRecord.baseTelNum - lastRecord.baseTelNum) + newRecord.numCnt;} else {records.add(newRecord);}}/** * write index info to file. * */private void writeDate(String filePath, HashMap<Long, String> telToAreaCode) {// 1. get all area infoArrayList<String> tmpAreaCodes = new ArrayList<String>(telToAreaCode.values());ArrayList<String> strAreaCodes = new ArrayList<String>();for (String str : tmpAreaCodes) {if (!strAreaCodes.contains(str)) {strAreaCodes.add(str);}}tmpAreaCodes.clear();tmpAreaCodes = null;StringBuffer sb = new StringBuffer();for (String str : strAreaCodes) {sb.append(str + ",");}sb.deleteCharAt(sb.length() - 1);AreaCode areaCode = new AreaCode(sb.toString());areaCode.print();// 2. Sort HashMap and combined the adjacent telephone numberArrayList<Long> telNunms = new ArrayList<Long>(telToAreaCode.keySet());Collections.sort(telNunms);ArrayList<Record> records = new ArrayList<Record>();long baseNum = 0;String baseArea = null;int numCnt = 0;for (Long tm : telNunms) {if (numCnt == 0) {baseNum = tm;baseArea = telToAreaCode.get(tm);numCnt = 1;} else {if (tm == baseNum + numCnt && baseArea.equals(telToAreaCode.get(tm))) {numCnt++;} else {combinedRecords(records, new Record(baseNum, numCnt, strAreaCodes.indexOf(baseArea)));baseNum = tm;baseArea = telToAreaCode.get(tm);numCnt = 1;}}}combinedRecords(records, new Record(baseNum, numCnt, strAreaCodes.indexOf(baseArea))); // for (Record record : records) {// record.print();// }// 3. Write data to the fileRandomAccessFile raf = null;try {raf = new RandomAccessFile(filePath, "rw");raf.seek(0);Hearder hearder = new Hearder();hearder.firstRecordOffset = hearder.Size() + areaCode.Size();hearder.lastRecordOffset = hearder.firstRecordOffset + (records.size() - 1) * records.get(0).Size();hearder.print();hearder.write(raf);areaCode.write(raf);for (Record record : records) {record.write(raf);}} catch (Exception e) {e.printStackTrace();} finally {if (raf != null) {try {raf.close();} catch (IOException e) {e.printStackTrace();}}}}class Hearder {int firstRecordOffset;int lastRecordOffset;public int Size() {return (Integer.SIZE + Integer.SIZE) / Byte.SIZE;}public void write(RandomAccessFile raf) throws IOException {raf.writeInt(this.firstRecordOffset);raf.writeInt(this.lastRecordOffset);}public void read(RandomAccessFile raf) throws IOException {this.firstRecordOffset = raf.readInt();this.lastRecordOffset = raf.readInt();}public void print() {System.out.println("===== Hearder ===== ");System.out.println("[" + firstRecordOffset + " , " + lastRecordOffset + "]");}}class AreaCode {private String areacode;private String[] codes;public AreaCode() {this("");}public AreaCode(String areacode) {this.areacode = areacode;this.codes = null;}public int Size() {return areacode.getBytes().length + (Integer.SIZE / Byte.SIZE);}public void print() {System.out.println("===== AreaCode ===== ");System.out.println("[" + areacode.getBytes().length + "]" + areacode);}public void write(RandomAccessFile raf) throws IOException {raf.writeInt(areacode.getBytes().length);raf.write(this.areacode.getBytes());}public void read(RandomAccessFile raf) throws IOException {byte[] bytes = new byte[raf.readInt()];raf.read(bytes);this.areacode = new String(bytes);}public String getCodeByIndex(int index) {if (this.codes == null) {this.codes = this.areacode.split(",");}return (index < 0 || this.codes == null || index >= this.codes.length) ? null : this.codes[index];}
}class Record {long baseTelNum;int numCnt;int areacodeIndex;public Record() {this(0, 0, 0);}public Record(long baseTelNum, int numCnt, int areacodeIndex) {this.baseTelNum = baseTelNum;this.numCnt = numCnt;this.areacodeIndex = areacodeIndex;}public void print() {System.out.println("===== Record ===== ");System.out.println("<" + baseTelNum + "> <" + numCnt + "> <" + areacodeIndex + ">");}public int Size() {return (Long.SIZE + Integer.SIZE) / Byte.SIZE;}public void write(RandomAccessFile raf) throws IOException {raf.writeLong(this.baseTelNum);int tmp = this.numCnt << 16;tmp += 0xFFFF & this.areacodeIndex;raf.writeInt(tmp);}public void read(RandomAccessFile raf) throws IOException {this.baseTelNum = raf.readLong();int tmp = raf.readInt();this.numCnt = tmp >> 16;this.areacodeIndex = 0xFFFF & tmp;}public int inWhich(long telNum) {if (telNum < this.baseTelNum) {return -1;} else if (telNum >= this.baseTelNum + this.numCnt) {return 1;} else {return 0;}}}public String searchTel(String indexFilePath, String telNum) {return searchTel(indexFilePath, telNum, false);}/** * search * */public String searchTel(String indexFilePath, String telNum, boolean forecast) {StringBuffer sb = new StringBuffer(telNum);// +if (sb.charAt(0) == '+') {sb.deleteCharAt(0);}// 86if (sb.charAt(0) == '8' && sb.charAt(1) == '6') {sb.delete(0, 2);}// 以0开头，是区号if (sb.charAt(0) == '0') {sb.deleteCharAt(0);// 首先按照4位区号查询，若查询为空，再按3位区号查询if (sb.length() >= 3) {sb.delete(3, sb.length());} String dial = searchTel(indexFilePath, Long.valueOf(sb.toString()),false);if (dial != null) {return dial;}if (sb.length() >= 2) {sb.delete(2, sb.length());}}// 以1开头，是手机号或者服务行业号码else if (sb.charAt(0) == '1') {// 首先按照手机号码查询，若查询为空，再按特殊号码查询if (sb.length() > 7) {String dial = searchTel(indexFilePath, Long.valueOf(sb.substring(0, 8)),false);if (dial != null) {return dial;}dial = searchTel(indexFilePath, Long.valueOf(sb.toString()),false);if (dial != null) {return dial;}// 只需要保留7位号码就ok了，多余的删掉if (sb.length() > 7) {sb.delete(7, sb.length());}} else {//小于7位，最有可能是服务号码//do nothing.}}// 以其他数字开头，这也不知道是啥号码了else {//do nothing.}return searchTel(indexFilePath, Long.valueOf(sb.toString()), forecast);}private String searchTel(String indexFilePath, long telNum, boolean forecast) {RandomAccessFile raf = null;try {raf = new RandomAccessFile(indexFilePath + INDEXDATAFILE, "r");if (cacheIndexFilePath == null || !cacheIndexFilePath.equals(indexFilePath)) {cacheIndexFilePath = indexFilePath;cacheHearder = new Hearder();cacheHearder.read(raf);cacheHearder.print();cacheAreaCode = new AreaCode();cacheAreaCode.read(raf);cacheAreaCode.print();}int index = lookUP(raf, cacheHearder.firstRecordOffset, cacheHearder.lastRecordOffset, telNum, forecast);return cacheAreaCode.getCodeByIndex(index);} catch (Exception e) {e.printStackTrace();} finally {if (raf != null) {try {raf.close();} catch (IOException e) {e.printStackTrace();}}}return null;}private int lookUP(RandomAccessFile raf, long startpos, long endpos, long looknum, boolean forecast) throws IOException {Record record = new Record();long seekpos = 0;do {seekpos = startpos + (endpos - startpos) / record.Size() / 2 * record.Size();raf.seek(seekpos);record.read(raf);if (record.inWhich(looknum) > 0) {startpos = seekpos + record.Size();} else if (record.inWhich(looknum) < 0) {endpos = seekpos - record.Size();} else {return record.areacodeIndex;}} while (startpos <= endpos);if (forecast) {return record.areacodeIndex;} else {return -1;}}
}程序运行情况如下：
==== Hearder ===== [4554 , 605622] ===== AreaCode ===== [4542]北福建南平,福建三明,海果洛,青海海南,... 13889650920 : 辽宁大连 20ms +8613659867583 : 湖北武汉 2ms 1301815 : 四川泸州 2ms 没有预测1301816 : null 2ms 根据号码连贯性原理预测1301816 : 四川泸州 1ms 1301817 : 四川宜宾 2ms
可以看到，除了第一次查询的时候要加载索引文件大约耗时20ms，以后的查询基本都在1ms，速度非常快了！！！
本程序的测试data文件下载telinfo
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