Java I/O常用流示例

package io;
import java.io.*;
/**
* @author 高枕吴忧
* 利用缓冲区原理,BufferedInputStream,
* 实现的文件字节流读取功能示范
*
*/
public class BufferedInOutputStream {
public BufferedInOutputStream() {
ioTest2();
}
public void ioTest2() {
FileInputStream in = null ;
BufferedInputStream bi = null;
int i= 0;
int count=0;
try{
in = new FileInputStream("D:/j/o/java2.txt");
bi = new BufferedInputStream(in);
while(( i=bi.read())!=-1) {
System.out.print((char)i);
count++;
}
System.out.println(count);
in.close();
bi.close();
}catch (IOException e){
e.printStackTrace();
}
}
public static void main(String[] args) {

new BufferedInOutputStream();
}
}
----------------------------------
package io;
import java.io.*;
/**
* @author Owner 利用缓冲区原理,BufferedInputStream,
* 实现的文件字符流读取和写入功能示范
*/
public class BufferedReaderWriter {
public BufferedReaderWriter() {
bufferRdWter();
}
public void bufferRdWter() {
FileReader fr = null;
FileWriter wt = null;
BufferedReader br = null;
BufferedWriter bw = null;
String s = "";
try {
fr = new FileReader("D:/j/o/java.txt");
br = new BufferedReader(fr);
wt = new FileWriter("D:/j/o/javat2.txt");
bw = new BufferedWriter(wt);
while ((s = br.readLine()) != null) {
bw.write(s);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
bw.flush();
wt.close();
bw.close();
br.close();
fr.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
new BufferedReaderWriter();
}
}
--------------------------------
package io;
import java.io.*;
/**
* @author 高枕吴忧
* 数据流,注意的是先进先出.数据流方便我们用IO输出基本数据类型的值.比如它提供的readDouble();
*
*/
public class DataInOutputStr