废话不多说，直接上代码，整理你杂乱单词的必备干货

package com.hp.word;

import java.io.*;
import java.util.TreeMap;
import java.util.Map;

/**
 * 排序单词
 * 
 * @author Administrator
 *资料： http://wenda.so.com/u/1901333518
 */
public class Sort2 {
    // 定义一个Treemap集合

    private static TreeMap<String, Integer> words = new TreeMap<String, Integer>(
            String.CASE_INSENSITIVE_ORDER);

    // String.CASE_INSENSITIVE_ORDER 忽略大小写
    /**
     * 单词排序并且计算重复
     * 
     * @throws IOException
     */
    private static void sort() throws IOException {

        File f = new File("e:\\word.txt");
        // 装饰模式
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                new FileInputStream(f)));
        // 单词
        String word = null;
        // 如果读取的这一行不为空的话
        while ((word = reader.readLine()) != null) {
            //判断是否存在键所对应的值，即判断是否有重复单词
            if (words.containsKey(word))
                words.put(word, words.get(word) + 1);
            else
                words.put(word, 1);
        }
        reader.close();
//排序后写入
        outFile(f);
    }
/**
 * 重新写入文件，并且计算值
 * @param f
 * @throws FileNotFoundException
 * @throws IOException
 */
    private static void outFile(File f) throws FileNotFoundException,
            IOException {

        BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(
                new FileOutputStream(f)));

        for (Map.Entry<String, Integer> item : words.entrySet()) {

            writer.write(item.getKey() + "\t" + judge(item.getValue()));
            writer.newLine();
        }
        writer.close();
    }
/**
 * 判断次数是否大于2
 * @param number
 * @return
 */
    public static String judge(Integer number) {
        int n = number;
        if (n < 2) {
            return " ";
        } else {
            return number + "";
        }

    }

    public static void main(String args[]) throws IOException {
        sort();
        System.out.println("成功");
    }
}