java中FileWriter和FileReader 的用法

淡淡的烟草味﹌ 2022-03-02 02:16 282阅读 0赞

java:IO流(readLine()和newLine()方法)

package com.itcast.demo4;
    
    import java.io.*;
    
    public class Java_2 {
        public static void main(String args[]) {
            String ShowMes[] = {"在那山的那边海的那边有一群蓝精灵", "它们活泼又聪明它们调皮又灵敏", "它们自由自在生活在那绿色的大森林", "它们善良勇敢相互都欢喜！"};
            try {
                //*********Found********
                FileWriter out = new FileWriter("test.txt");
                BufferedWriter outBW = new BufferedWriter(out);
                for (int i = 0; i < ShowMes.length; i++) {
                    outBW.write(ShowMes[i]);
                    outBW.newLine();//跨平台的换行符
                    //outBW.write("\r\n");//只支持windows系统
                }
                //*********Found********
                outBW.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
            try {
                //*********Found********
                FileReader in = new FileReader(new File("test.txt"));
                BufferedReader inBR = new BufferedReader(in);
                String stext = null;
                int j = 1;
                while ((stext = inBR.readLine()) != null) {
                    System.out.println("第" + j + "行内容：" + stext);
                    //*********Found********
                    j++;
                }
                inBR.close();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

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