流 - FileReader

字符操作流 FileReader从文件读取数据

import java.io.FileReader;
import java.io.BufferedReader;
import java.io.IOException;
public class FileReaderDemo {
    public static void main(String[] args) {
        FileReaderDemo frd =  new FileReaderDemo();
        frd.readMyFile(args[0]);
    }
    public void readMyFile(String File) {
        // 声明一个FileReader
        FileReader fr = null;
        BufferedReader br = null;
        // 备用String
        String stringBuff = null;
        // 读取数据的行数
        int readCount = 0;
        try {
            fr = new FileReader(File);
            br = new BufferedReader(fr);
            // 开始读取
            while((stringBuff = br.readLine()) != null) {
                readCount++;
                // 输出当前行数据
                System.out.println("Line " + readCount
                                    +  " : " + stringBuff);
            }
            // 关闭流
            fr.close();
        } catch (IOException e) {
            System.out.println(e);
            System.exit(1);
        }
    }
}

输出