Java-IO读写文件简单操作2

Posted 2021-01-10 xiaomingzaixian

　　承接Java-IO读写文件简单操作，这里再次写个小demo巩固一下知识点。

代码文件：demo.java

package com.test.demo;

import java.io.*;

public class demo {
    public static void main(String[] args) {
        // 写文件
        writeFile();

        // 读文件
        readFile();

    }
    /**
     * @function 读文件
     * @param
     * @return void
     * @date 2018-10-06 14:08
     */
    public static void readFile() {
        // 1.通过File创建文件路径对象
        File filePath = new File("src/com/test/demo/test.txt");

        try {
            // 2.创建节点流
            FileReader fr = new FileReader(filePath);

            // 3.创建处理流包装节点流
            BufferedReader br = new BufferedReader(fr);

            // 4.创建存储数据空间
            StringBuffer idList = new StringBuffer();
            StringBuffer nameList = new StringBuffer();
            StringBuffer descList = new StringBuffer();

            // 5.读取数据
            while(br.ready()){
                // 字符串切割
                String[] content = br.readLine().split("	");
                idList.append(content[0]);
                nameList.append(content[1]);
                descList.append(content[2]);
            }

            // 6.读取数据
            System.out.println(idList);
            System.out.println(nameList);
            System.out.println(descList);


            // 7.关闭处理流、节点流等
            br.close();
            fr.close();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }


    /**
     * @function 写文件
     * @param
     * @return void
     * @date 2018-10-06 13:14
     */
    public static void writeFile() {
        // 1.通过File创建文件路径对象
        File filePath = new File("src/com/test/demo/test.txt");

        try {
            // 2.创建节点流
            FileWriter fw = new FileWriter(filePath);

            // 3.创建处理流包装节点流
            BufferedWriter bw = new BufferedWriter(fw);

            // 4.构建数据
            String[] idList = { "20181001", "20181002", "20181003", "20181004" };
            String[] nameList = { "xiaoming", "xiaohong", "xiaofang", "xiaomei" };
            String[] descList = { "小明", "小红", "小芳", "小美" };
            
            // 5.写入数据
            for(int i = 0; i < idList.length; i++){
                // 以"Tab"键分隔字段
                bw.write(idList[i] + "	");
                bw.write(nameList[i] + "	");
                bw.write(descList[i] + "
");
            }

            // 6.关闭处理流、节点流等
            bw.close();
            fw.close();
            
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

运行截图：(产生文件：test.txt)