java如何把一篇英文按照空格分割并按照字母顺序排序

package com.chenmingcheng;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.util.ArrayList;
import java.util.Arrays;

public class BianYiYuanLi1 {

public static void main(String[] args) {
String filePath = "D:\\20160307.txt";
String wenzhang = readTextFile(filePath);
wenzhang = wenzhang.replaceAll("(,+|\\.+|!+|/+|'+|’)"," ");//去掉标点符号
System.out.println(wenzhang);
String[] result = wenzhang.split("\\s{1,}");//按照空格分割
Arrays.sort(result);
ArrayList<String> arrayList = new ArrayList<String>();
for(int  i =0;i<result.length;i++){
//			System.out.println(result[i]);
if(!arrayList.contains(result[i]))//去重
arrayList.add(result[i]);
}
for(String tmp : arrayList){
System.out.println(tmp);
}
}

public static String readTextFile(String filePath) {
File file = new File(filePath);
StringBuffer stringBuffer = new StringBuffer();
if (file.isFile() && file.exists()) {
try {
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(new FileInputStream(file)));
String lineText = null;
while((lineText=bufferedReader.readLine())!=null){
//System.out.println(lineText);
stringBuffer.append(lineText);
}
System.out.println(stringBuffer);
return stringBuffer.toString();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
}