Question

用java 读取本地磁盘下的一个txt文件

用java 读取本地磁盘下的一个txt 文件的内容，txt 文件中的内容是一个英文句子，将文
件内容和英文句子中的单词数量统计显示在DOS 窗口上。

Answer 1

import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;

public class BufferedInputStreamDemo {
	public static void main(String[] args) throws IOException {
		// BufferedInputStream(InputStream in)
		BufferedInputStream bis = new BufferedInputStream(new FileInputStream(
				"bos.txt"));

		// 读取数据
		// int by = 0;
		// while ((by = bis.read()) != -1) {
		// System.out.print((char) by);
		// }
		// System.out.println("---------");

		byte[] bys = new byte[1024];
		int len = 0;
		while ((len = bis.read(bys)) != -1) {
			System.out.print(new String(bys, 0, len));
		}

		// 释放资源
		bis.close();
	}
}

Answer 2

用文件流将文件内容读出来就对了，判断多少个单词要看你单词分隔的规则，自己判断吧
String line = "";
InputStream is = new FileInputStream("C:/test.txt");//加载文件
BufferedReader bf = new BufferedReader(new InputStreamReader(is));
while ((line=bf.readLine()) != null) {//循环一次读取一行
//do something...
}

Answer 3

import java.io.*;
public class ReadBytes
{
public static void main(String[] args)
{
int b;
try
{
FileInputStream fs = new FileInputStream("hello.txt");
while (fs.read() != -1)
{
b = fs.read();
System.out.println("byte read="+b);
}
}
catch (IOException e)
{
System.out.println("文件操作错误："+e.toString());
}
}
}

Answer 4

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class temp {
public static void main(String[] args) {
BufferedReader bufferedReader = null;
long wordcount = 0 ;
try {
bufferedReader = new BufferedReader(new FileReader("C:\\Users\\Administrator\\Desktop\\1.txt"));
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
String line = "";
try {
while((line = bufferedReader.readLine())!=null)
{
Pattern pattern = Pattern.compile("\\w+");
Matcher matcher = pattern.matcher(line);
System.out.println(line);
while(matcher.find())
{
//System.out.println(matcher.group());
wordcount++;
}
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
bufferedReader.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("单词个数为："+ wordcount);
}
}