1. 编写一个程序，从键盘读入一串英文字符串，将每个英文单词的首字母转换成大写后存到 D:\word.txt 文件中。

蔚落 2022-12-21 10:49 120阅读 0赞

实验九 Java 语言的输入输出与文件处理
    实验目的
    1．了解流式输入输出的基本原理。
    2．掌握 File、FileInputStream、FileOutputStream 类的使用方法。
    3．掌握 FileReader、FileWriter、BufferedReader 类的使用方法。
    主要仪器设备及耗材
    安装了 JDK1.8 的 PC 一台
    实验内容
    1. 编写一个程序，从键盘读入一串英文字符串，将每个英文单词的首字母转换成大写后存
    到 D:\word.txt 文件中。
    2. 编写一个程序，将一个文本文件的内容按行读出，每读出一行就顺序加上行号，并写入
    到另一个文件中。

![20201116011655227.png][]

package com.temp;
    
    import java.io.*;
    import java.util.StringTokenizer;
    
    /**
     * @Author lanxiaofang
     * @email 983770299@qq.com
     * @date 2020/11/9 8:39
     */
    public class InputOutputAndFileHandle {
    
        private final static String url_1 = "D://word1.txt";
        private final static String url_2 = "D://word2.txt";
        private final static String url_3 = "D://word3.txt";
        private final static String url_4 = "D://word4.txt";
    
        public static void main(String[] args) {
    
            //推荐使用BufferedReader,BufferedReader的效率比Scanner 高
            //BufferedReader 是先把数据读到缓存区然后在写到硬盘里,Scanner是直接往硬盘些数据
            BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
            System.out.println("-- 请输入一段英文句子");
            String content = null;
            try {
                content = in.readLine();
            } catch (IOException e) {
                e.printStackTrace();
            }
    //      Scanner in = new Scanner(System.in);
    //      String content = in.nextLine();
    
            String iNITCAP = iNITCAP(content);
    
            //使用一
            System.out.println("----使用一");
            useFilWriter(iNITCAP, url_1);
            useFileReader(url_1);
            //使用二
            System.out.println("----使用二");
            useBufferedReader(url_1);
            useBufferedWriter(url_1, url_2);
            useBufferedWriterOfContent(iNITCAP, url_3);
            //使用三
            System.out.println("----使用三");
            useFileOutputStreamAndUseFileInputStream(url_4);
    
        }
    
        /**
         * useFileOutputStreamAndUseFileInputStream
         *
         * @param url
         */
        public static int useFileOutputStreamAndUseFileInputStream(String url) {
            //把字节输入流的内容通过字节输出流存到硬盘
            try {
                char ch;
                FileInputStream fileInputStream = new FileInputStream(FileDescriptor.in); //声明文件字节流输入流对象，创建标准输入流对象
                FileOutputStream fileOutputStream = new FileOutputStream(url); // 声明文件字节输出流对象，创建输出流对象为url1中的文件
                //输入一串字符串，以'#'作为结束标准
                while ((ch = (char) fileInputStream.read()) != '#') { // 调用 fileInputStream.read() 从键盘上读取数据
                    fileOutputStream.write(ch); //fileOutputStream.write(ch)从键盘上读取的数据写入到url1中的文件中
                }
                System.out.println("-- fileOutputStream -- Write is finished");
            } catch (IOException e) {
                e.printStackTrace();
                return 0;
            }
            //从硬盘通过字节输入流读取数据，字节输出流输出数据到控制台
            try {
                int data;
                FileInputStream fIStream = new FileInputStream(url);
                FileOutputStream fOStream = new FileOutputStream(FileDescriptor.out);
                while (fIStream.available() > 0) {
                    data = fIStream.read();
                    fOStream.write(data);
                }
                System.out.println("-- fOStream -- Write is finished");
            } catch (IOException e) {
                e.printStackTrace();
                return 0;
            }
            return 1;
        }
    
    
        /**
         * useFilWriter
         *
         * @param content,url Writes the content to the URL file and prompts it for success.
         */
        public static int useFilWriter(String content, String url) {
            try {
                FileWriter fileWriter = new FileWriter(url);
                fileWriter.write(content);
                fileWriter.close();
                System.out.println("--useFilWriter-- writer to " + url + " success.");
            } catch (IOException e) {
                e.printStackTrace();
                return 0;
            }
            return 1;
        }
    
    
        /**
         * useFileReader
         *
         * @param url Read the content from the url file and output it.
         */
        public static int useFileReader(String url) {
            try {
                char[] content = new char[1024];
                FileReader fileReader = new FileReader(url);
                int num = fileReader.read(content);
                String reContent = new String(content, 0, num);
                System.out.println("--useFileReader-- had reade " + num + " chars :\n" + reContent);
            } catch (IOException e) {
                e.printStackTrace();
                return 0;
            }
            return 1;
        }
    
    
        /**
         * useBufferedReader
         *
         * @param url Read content from the URL file, read it line by line,
         *            output it line by line, and count the total number of lines read.
         */
        public static int useBufferedReader(String url) {
            String thisLine;
            int count = 0;
            try {
                FileReader fileReader = new FileReader(url);
                BufferedReader bufferedReader = new BufferedReader(fileReader);
                while ((thisLine = bufferedReader.readLine()) != null) {
                    count++;
                    System.out.println(thisLine);
                }
                System.out.println("--useBufferedReader-- had read " + count + " lines");
            } catch (IOException e) {
                e.printStackTrace();
                return 0;
            }
            return 1;
        }
    
    
        /**
         * useBufferedWriter
         *
         * @param from_url,to_url Copy the contents from the file in path from_url to the file in path to_url
         *                        Read a line, copy a line, and then create a new line
         */
        public static int useBufferedWriter(String from_url, String to_url) {
            String thisLine;
            int count = 0;
            try {
                FileReader fileReader = new FileReader(from_url);
                FileWriter fileWriter = new FileWriter(to_url);
                BufferedReader bufferedReader = new BufferedReader(fileReader);
                BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
                while ((thisLine = bufferedReader.readLine()) != null) {
                    count++;
                    System.out.println(thisLine);
                    bufferedWriter.write(thisLine);
                    bufferedWriter.newLine();
                }
                bufferedWriter.flush();
                System.out.println("--useBufferedWriter-- had read " + count + " lines. \n--useBufferedWriter-- had writer +count+\" lines.");
            } catch (IOException e) {
                e.printStackTrace();
                return 0;
            }
            return 1;
        }
    
    
        /**
         * useBufferedWriterOfContent
         *
         * @param content,to_url writes the content to the file at the to_url
         */
        public static int useBufferedWriterOfContent(String content, String to_url) {
            try {
                FileWriter fileWriter = new FileWriter(to_url);
                BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
                bufferedWriter.write(content);
                bufferedWriter.flush();
                System.out.println("--useBufferedWriter-- had writer success.");
            } catch (IOException e) {
                e.printStackTrace();
                return 0;
            }
            return 1;
        }
    
    
        /**
         * iNITCAP
         * Constructs a iNITCAP function with the specified detail content.
         * You can use s1.toString().trim() or s1.toString().substring(0,s1.length()-1)
         * to clear the space at the end of the string
         *
         * @param content the detail content (which is saved for later convert
         *                the first letter of each English word to uppercase
         */
        public static String iNITCAP(String content) {
            StringBuffer s1 = new StringBuffer();
            StringTokenizer st = new StringTokenizer(content);
            while (st.hasMoreTokens()) {
                String str = st.nextToken();
                char c = (str).charAt(0);
                if (c >= 'a' && c <= 'z') {
                    c = (char) ((int) c - 32);
                    s1.append(c);
                } else
                    s1.append(c);
                for (int i = 1; i < (str).length(); i++) {
                    char c1 = (str).charAt(i);
                    s1.append(c1);
                }
                s1.append(" ");
            }
            System.out.println("--iNITCAP--" + s1.toString().trim());
            return s1.toString();
        }
    
    
    }

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[20201116011655227.png]: /images/20221120/81c5e7aead514c65aa0d8f2332030e68.png
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