Java技能树-IO-Reader/Writer

1 需求

2 接口

Class Reader

java.lang.Object 

        java.io.Reader 

• Field Detail
  • protected Object lock
• Constructor Detail
  • protected Reader()
  • protected Reader(Object lock)
• Method Detail
  • public abstract void close() throws IOException
  • public int read() throws IOException
  • public int read(char[] cbuf) throws IOException
  • public abstract int read(char[] cbuf, int off, int len) throws IOException
  • public int read(CharBuffer target) throws IOException

Class Writer
java.lang.Object 
        java.io.Writer 

• Field Detail
  • protected Object lock
• Constructor Detail
  • protected Writer()
  • protected Writer(Object lock)
• Method Detail
  • public Writer append(char c) throws IOException
  • public Writer append(CharSequence csq) throws IOException
  • public Writer append(CharSequence csq, int start, int end) throws IOException
  • public abstract void close() throws IOException
  • public abstract void flush() throws IOException
  • public void write(char[] cbuf) throws IOException
  • public abstract void write(char[] cbuf, int off, int len) throws IOException
  • public void write(int c) throws IOException
  • public void write(String str) throws IOException
  • public void write(String str, int off, int len) throws IOException

3 示例代码

import java.io.*;

public class Test {
    public static void main(String[] args) throws IOException {
        // 字符流 示例
        Reader reader = new FileReader("C:\test.txt");
        int i = 0;
        while ((i = reader.read()) != -1) {
            System.out.println(i);
        }
        reader.close();

        System.out.println("******* 分割线 ******");

        //字节流 示例
        InputStream inputStream = new FileInputStream("C:\test.txt");
        int j = 0;
        while ((j = inputStream.read()) != -1) {
            System.out.println(j);
        }
        inputStream.close();
    }
}

import java.io.*;

public class Test {
    public static void main(String[] args) throws IOException {
        Writer writer = new FileWriter("C:\test.txt");
        writer.write("中国");
        writer.close();
    }
}

4 参考资料