java讀寫Txt文件

1.使用FileInputStream實現讀取txt文件內容:java

2.使用FileOutputStream實現寫入txt文件內容:app

package cn.xiaobing.util;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;

public class ReadTxt {
    /**傳入txt路徑讀取txt文件
     * @param txtPath
     * @return 返回讀取到的內容
     */
    public static String readTxt(String txtPath) {
        File file = new File(txtPath);
        if(file.isFile() && file.exists()){
            try {
                FileInputStream fileInputStream = new FileInputStream(file);
                InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream);
                BufferedReader bufferedReader = new BufferedReader(inputStreamReader);
                 
                StringBuffer sb = new StringBuffer();
                String text = null;
                while((text = bufferedReader.readLine()) != null){
                    sb.append(text);
                }
                return sb.toString();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return null;
    }
    

    /**使用FileOutputStream來寫入txt文件
     * @param txtPath txt文件路徑
     * @param content 須要寫入的文本
     */
    public static void writeTxt(String txtPath,String content){    
       FileOutputStream fileOutputStream = null;
       File file = new File(txtPath);
       try {
           if(file.exists()){
               //判斷文件是否存在,若是不存在就新建一個txt
               file.createNewFile();
           }
           fileOutputStream = new FileOutputStream(file);
           fileOutputStream.write(content.getBytes());
           fileOutputStream.flush();
           fileOutputStream.close();
       } catch (Exception e) {
           e.printStackTrace();
       }
    }
}
        

3.驗證代碼學習

    //驗證方法:先寫入文件後讀取打印以下:
    public static void main(String[] args) {
        writeTxt("D:/yzm/result1.txt", "測試寫入txt文件內容");
        String str = readTxt("D:/yzm/result1.txt");
        System.out.println(str);
    }

控制檯輸出:測試

4.學習後總結,不足之處,後續補充!spa

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