将TXT文章大写全部转换为小写，并且消除空格和换行
我将mysql关键字从网上整理了一下，通过以下代码完成了转换，十分有限：
代码：
		package com;

		import java.io.BufferedReader;
		import java.io.BufferedWriter;
		import java.io.File;
		import java.io.FileNotFoundException;
		import java.io.FileReader;
		import java.io.FileWriter;
		import java.io.IOException;
		import java.util.regex.Matcher;
		import java.util.regex.Pattern;

		public class Create {
			public static void main(String[] args) {
				try {
					BufferedReader br=new BufferedReader(new FileReader(new File("d:/hh/up.txt")));
					BufferedWriter bw=new BufferedWriter(new FileWriter(new File("d:/hh/low.txt")));
					String str="";
					String jieguo="";
					Pattern p=Pattern.compile("[a-zA-Z0-9_]+");
					while(br.ready()) {
						str=br.readLine();		
						Matcher m=p.matcher(str);
						while(m.find()) {
							jieguo=jieguo+m.group().toLowerCase()+" ";
							//System.out.print(m.group().toLowerCase()+" ");
						}	
					}
					bw.write(jieguo);
					bw.close();
					br.close();
					
				} catch (FileNotFoundException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
			}
		}
结果：
见附件1。
			
https://download.csdn.net/download/weixin_42321963/10559116