fast 地址读取库，包含省市区及身份证号前缀
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地址库大小 54.14746KB
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读取耗时 14~25ms （MacBook Pro LQ2 i7-4770HQ）
{北京市={市辖区={东城区=110101, 西城区=110102, 崇文区=110103,...
代码
package com.address;
import java.io.BufferedInputStream;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.LinkedHashMap;
/**
* Created by wanjian on 2017/11/15.
*/
public class Read {
public static void main(String[] args) throws IOException {
String file = "area.bin";
System.out.println("地址库大小/KB " + new File(file).length() / 1024f);
long s = System.currentTimeMillis();
InputStream inputStream = new BufferedInputStream(new FileInputStream(file));
LinkedHashMap<String, LinkedHashMap<String, LinkedHashMap<String, Integer>>> map = read(inputStream);
inputStream.close();
System.out.println("读取耗时/ms " + (System.currentTimeMillis() - s));
System.out.println(map);
}
private static LinkedHashMap<String, LinkedHashMap<String, LinkedHashMap<String, Integer>>> read(InputStream in) throws IOException {
BufferedInputStream inputStream = new BufferedInputStream(in);
LinkedHashMap<String, LinkedHashMap<String, LinkedHashMap<String, Integer>>> provinceSet = new LinkedHashMap<>();
byte provinceSetSize = readByte(inputStream);
for (int i = 0; i < provinceSetSize; i++) {
String provinceName = readString(inputStream);
LinkedHashMap<String, LinkedHashMap<String, Integer>> citySet = new LinkedHashMap<>();
provinceSet.put(provinceName, citySet);
byte citySetSize = readByte(inputStream);
for (int j = 0; j < citySetSize; j++) {
String cityName = readString(inputStream);
LinkedHashMap<String, Integer> areaSet = new LinkedHashMap<>();
citySet.put(cityName, areaSet);
byte areaSetSize = readByte(inputStream);
for (int k = 0; k < areaSetSize; k++) {
String areaName = readString(inputStream);
int code = read3Byte(inputStream);
areaSet.put(areaName, code);
}
}
}
return provinceSet;
}
private static String readString(InputStream inputStream) throws IOException {
byte[] str = new byte[readByte(inputStream)];
int read = 0;
int count;
while ((read < str.length)) {
count = inputStream.read(str, read, str.length - read);
if (count < 0) {
throw new EOFException("address file maybe incomplete");
}
read += count;
}
return new String(str, "UTF-8");
}
private static int read3Byte(InputStream inputStream) throws IOException {
int h = inputStream.read();
if (h < 0) {
throw new EOFException("address file maybe incomplete");
}
int m = inputStream.read();
if (m < 0) {
throw new EOFException("address file maybe incomplete");
}
int l = inputStream.read();
if (l < 0) {
throw new EOFException("address file maybe incomplete");
}
return h << 16 | m << 8 | l;
}
private static byte readByte(InputStream inputStream) throws IOException {
int v = inputStream.read();
if (v < 0) {
throw new IOException("address file maybe incomplete");
}
return (byte) v;
}
/* 生成地址库文件
public static void geneAddressFile(LinkedHashMap<String, LinkedHashMap<String, LinkedHashMap<String, Integer>>> provinceSet) throws IOException {
OutputStream outputStream = new BufferedOutputStream(new FileOutputStream("/area.bin"));
writeByte((byte) provinceSet.size(), outputStream);
for (Map.Entry<String, LinkedHashMap<String, LinkedHashMap<String, Integer>>> province : provinceSet.entrySet()) {
String provinceName = province.getKey();
writeString(provinceName, outputStream);
LinkedHashMap<String, LinkedHashMap<String, Integer>> citySet = province.getValue();
writeByte((byte) citySet.size(), outputStream);
for (Map.Entry<String, LinkedHashMap<String, Integer>> city : citySet.entrySet()) {
String cityName = city.getKey();
writeString(cityName, outputStream);
LinkedHashMap<String, Integer> areaSet = city.getValue();
writeByte((byte) areaSet.size(), outputStream);
for (Map.Entry<String, Integer> codeSet : areaSet.entrySet()) {
String codeName = codeSet.getKey();
writeString(codeName, outputStream);
int code = codeSet.getValue();
write3Byte(code, outputStream);
}
}
}
outputStream.close();
}
private static void writeString(String s, OutputStream outputStream) throws IOException {
byte bytes[] = s.getBytes("UTF-8");
writeByte((byte) bytes.length, outputStream);
outputStream.write(bytes);
}
private static void writeByte(byte b, OutputStream outputStream) throws IOException {
outputStream.write(b);
}
private static void write3Byte(int v, OutputStream outputStream) throws IOException {
outputStream.write((v >> 16) & 0xFF);
outputStream.write((v >> 8) & 0xFF);
outputStream.write(v & 0xFF);
}
*/
}
