使用字节流、字符流读写文件基础

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.Writer;

public class IOTest {
public static void main(String[] args){
IOTest io=new IOTest();
io.oTest();
io.iTest();
io.writerTest();
io.readerTest();
}
//字节流读写文件
public void oTest(){
String str="hello world";
OutputStream os=null;                           //<span style="font-family: Arial, Helvetica, sans-serif;">第一步：建立管道</span>
try {
os=new FileOutputStream("f:\\f1.txt");
for(int i=0;i<str.length();i++){        //第二步：打开开关
os.write(str.charAt(i));
}
os.close();                             //第三步：关闭连接
} catch (FileNotFoundException e) {
System.out.println("文件未找到！");
} catch (IOException e) {
System.out.println("文件操作错误！");
}

}
public void iTest(){
StringBuffer sb=new StringBuffer();
InputStream is=null;
try {
is=new FileInputStream("f:\\f1.txt");
int i=0;
while((i=is.read())!=-1){
sb.append((char)i);
}
System.out.println(sb);
is.close();
} catch (FileNotFoundException e) {
System.out.println("文件未找到！");
} catch (IOException e) {
System.out.println("文件操作错误！");
}
}
//字符流读写文件
public void writerTest(){
String s="你若盛开，清风自来";
Writer wt=null;
try {
wt=new FileWriter("f:\\f2.txt");
wt.write(s);
wt.close();
} catch (IOException e) {
System.out.println("文件操作错误！");
}
}
public void readerTest(){
StringBuffer sb=new StringBuffer();
Reader rd=null;
try {
rd=new FileReader("f:\\f2.txt");
int i=0;
while((i=rd.read())!=-1){
sb.append((char)i);
}
System.out.println(sb);
rd.close();
} catch (FileNotFoundException e) {
System.out.println("文件未找到！");
} catch (IOException e) {
System.out.println("文件操作错误！");
}
}
}