JavaExp9：输入输出流与文件操作

Posted 2022-11-27 咳咳n

JavaExp9：输入输出流与文件操作

最近比较忙，没多少时间写blog。。。
**程序设计题
1 使用文件字节输入/输出流，合并两个指定的文件。

package EXP2020.exp9;

import java.io.*;

/**
 * @author JM
 * @date 2020/5/6
 */
public class MainTestOne 
    //定义合并函数
    public static void mergeFile(InputStream file1, InputStream file2, OutputStream file3) throws IOException 
        //定义字节流对象，包装为缓冲流
        InputStream fi1 = new BufferedInputStream(file1);
        InputStream fi2 = new BufferedInputStream(file2);
        OutputStream fo = new BufferedOutputStream(file3);

        //设置缓冲区
        byte[] data = new byte[1024];
        int len = -1;

        //将file1的内容写入file3
        while ((len = fi1.read(data)) != -1) 
            fo.write(data, 0, len);
        
        //将file2的内容写入file3
        while ((len = fi2.read(data)) != -1) 
            fo.write(data, 0, len);
        
        fo.flush();
        fi1.close();
        fi2.close();
        fo.close();
    


    public static void main(String[] args) throws IOException 
        //读写文件的路径
        String path1 = "file1.txt";
        String path2 = "file2.txt";
        String path3 = "fileMerge.txt";

        //调用合并函数,第三个路径加上true来追加内容
        mergeFile(new FileInputStream(path1), new FileInputStream(path2), new FileOutputStream(path3, true));
    

2 将java的关键字保存在一个文本中，从键盘输入一个字符串，判断是否为java的关键字。**

package EXP2020.exp9;

import java.io.*;
import java.util.Scanner;
import java.util.StringTokenizer;

/**
 * @author JM
 * @date 2020/5/6
 */
public class MainTestTwo 
    public static void main(String[] args) throws IOException 
        Scanner sc = new Scanner(System.in);
        //提示用户输入要查找的关键字
        System.out.println("请输入你要查找的关键字：");
        String yourKey = sc.nextLine();

        //读写文件路径
        String path = "javakeywords.txt";

        //定义缓冲流对象
        BufferedReader bufferedReader = new BufferedReader(new FileReader(path));
        //设置查找的状态标志
        int flag = 0;
        String str = null;

        while ((str = bufferedReader.readLine()) != null) 
            //分析逐个单词进行判断
            StringTokenizer fenxi = new StringTokenizer(str);
            while (fenxi.hasMoreTokens()) 
                String keyword = fenxi.nextToken();
                if (yourKey.equals(keyword)) 
                    flag = 1;
                    break;
                
            
            if (flag == 1) break;//找到时退出第二层遍历，提高效率
        
        if (flag == 1) System.out.println("成功找到。");
        else System.out.println("没有找到。");
        bufferedReader.close();