Java基础巩固之IO

File file = new File("F:\\666.txt");
System.out.println(
file + 
file.getName() +         
file.getAbsoluteFile() + 
file.getPath()+ 
file.getAbsolutePath() + 
file.length() + 
file.getClass() + 
file.toString() + 
file.isDirectory() + 
file.isFile() + 
file.isHidden() + 
file.exists());
//file.createNewFile(); 创建文件  路径必须存在
//file.delete(); 删除文件
//file.mkdir();   新建文件夹
//file.mkdirs()  层级创建文件夹
 String[] list = file.list();
for (String fileName : list) {
System.out.println(fileName);
}
字节流读取字符
     GBK占两个字节
     UTF-8占3个字节
/**
 * 
 * 

 * 过滤器 是否以.java结尾
 */
public class FileFilterImpl implements FileFilter {

    @Override
    public boolean accept(File pathname) {
        return pathname.getName().toLowerCase().endsWith(".java");
    }
/**
 * 转换流   转码
 *
 */
 public static void main(String[] args) throws IOException {
        InputStreamReader isr = new InputStreamReader(new FileInputStream("F:\\666.txt"), "GBK");
        OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream("F:\\777.txt"), "UTF-8");

        int read = 0;
        while ((read = isr.read()) != -1) {
            osw.write(read);
        }

        osw.flush();
        osw.close();
        isr.close();
    }
/**
 * 缓冲流
 * 
 */
        //缓冲流去写
        FileOutputStream fos = new FileOutputStream("F:\\666.txt", true);
        BufferedOutputStream bos = new BufferedOutputStream(fos);
        bos.write("哈哈哈哈".getBytes());
        bos.flush();
        bos.close();
        fos.close();
        //缓冲字节读取
        FileInputStream fis = new FileInputStream("F:\\\\666.txt");
        BufferedInputStream bis = new BufferedInputStream(fis);

        int read = 0;
        while ((read = bis.read()) != -1) {
            System.out.print((char) read);
        }
        //缓冲字符读取
        FileReader fr = new FileReader("F:\\666.txt");
        BufferedReader br = new BufferedReader(fr);
        int read = 0;
        while ((read = br.read()) != -1) {
            System.out.print((char) read);
        }
        br.close();
        //缓冲字符写入
        FileWriter fw = new FileWriter("F:\\666.txt", true);
        BufferedWriter bw = new BufferedWriter(fw);
        bw.write("发射点发射点发射点");
        bw.flush();
        bw.close();
        fw.close();
        fr.close();