中文分詞應用很廣泛，網上也有很多開源專案。我在這裡主要講一下中文分詞裡面演算法的簡單實現，廢話不多說了，現在先上程式碼

package com;


import java.util.ArrayList;
import java.util.List;


public class Segmentation1 {
	private List<String> dictionary = new ArrayList<String>();
	private String request = "北京大學生前來應聘";
	
	public void setDictionary() {
		dictionary.add("北京");
		dictionary.add("北京大學");
		dictionary.add("大學");
		dictionary.add("大學生");
		dictionary.add("生前");
		dictionary.add("前來");
		dictionary.add("應聘");
	}
	
	public String leftMax() {
		String response = "";
		String s = "";
		for(int i=0; i<request.length(); i++) {
			s += request.charAt(i);
			if(isIn(s, dictionary) && aheadCount(s, dictionary)==1) {
				response += (s + "/");
				s = "";
			} else if(aheadCount(s, dictionary) > 0) {
				
			} else {
				response += (s + "/");
				s = "";
			}
		}
		return response;
	}
	
	private boolean isIn(String s, List<String> list) {
		for(int i=0; i<list.size(); i++) {
			if(s.equals(list.get(i))) return true;
		}
		return false;
	}
	
	private int aheadCount(String s, List<String> list) {
		int count = 0;
		for(int i=0; i<list.size(); i++) {
			if((s.length()<=list.get(i).length()) && (s.equals(list.get(i).substring(0, s.length())))) count ++;
		}
		return count;
	}
	
	public static void main(String[] args) {
		Segmentation1 seg = new Segmentation1();
		seg.setDictionary();
		String response1 = seg.leftMax();
		System.out.println(response1);
	}
}
 

演算法的核心就是從前往後搜尋，然後找到最長的字典分詞。