JAVA讀寫文件方法總結

1、直接讀文件

try (BufferedReader br = new BufferedReader(new FileReader("D:\\test.txt"))){
    String line = null;
     while((line = br.readLine()) != null){
         System.out.println(line);
     }
}

2、指定格式讀文件

BufferedReader br = new BufferedReader(
    new InputStreamReader(new FileInputStream("D:\\test.text"),"GB2312"))

3、寫文件

File file = new File("D:\\test.txt");
if(!file.exists()){
    file.createNewFile();
}
try (BufferedWriter bw = new BufferedWriter(new FileWriter(writeToFile()))){
    String st ="Hello World"
    bw.append(st);
    bw.flush();
}