java文件流FileOutputStream使用规则换行和追加信息，读取流的信息FileInputStream

Posted 2022-11-23 weixin_ancenhw

//文件输出留，输入到硬盘保存数据
public class FileStreram 
    public static void main(String[] args) throws IOException 
        File file = new File("C:\\\\test\\\\aa.txt");
        //是否追加数据
        FileOutputStream fo=new FileOutputStream(file,true);
        String str="ancen你好";
        fo.write(str.getBytes());
        //对添加的数据进行换行操作
        fo.write("\\r\\n".getBytes());
        fo.close();
    

//文件输出留，输入到硬盘保存数据
public class FileStraem 
    public static void main(String[] args) throws IOException 

        //加载要读取的文件路径
        File file = new File("C:\\\\test\\\\aa.txt");
        FileInputStream inputStream = new FileInputStream(file);
        
        int len=0;
        while ((len=inputStream.read())!=-1)
            System.out.print((char) len);
        

        inputStream.close();

    

定义字节数组，读取文件流。

public class FileStream 
    public static void main(String[] args) throws Exception 
        //读取文件流的路径
        File file = new File("03.txt");
        FileInputStream is = new FileInputStream(file);
        //定义存储字节的存储空间
        byte[] bytes = new byte[1024];
        //记录有效读取的字节个数
        int len=0;
        //循环遍历，读取到定义字节数组中
        while ((len=is.read(bytes))!=-1)

            System.out.println(new String(bytes,0,len));
        

        is.close();