java_24.1文件流的应用--复制文件

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注意：先开的流要最后关

用字节流传输

public class Demo {
public static void main(String[] args){
FileInputStream fis = null;
FileOutputStream fos = null;
try {
fis = new FileInputStream("d:\\aaa.txt");
fos = new FileOutputStream("d:\\bbb.txt");//字节输入流读取一个字节写一个字节
int len =0;
while((len=fis.read())!=-1) {
fos.write(len);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
if(fos!=null) {
try {
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(fis!=null) {
try {
fis.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}

用字符数组传输

public class Demo {
public static void main(String[] args){
FileInputStream fis = null;
FileOutputStream fos = null;
try {
fis = new FileInputStream("d:\\aaa.txt");
fos = new FileOutputStream("d:\\bbb.txt");//定义字符数组
byte[] b = new byte[1024];
//读取操作
int len = 0;
while((len = fis.read(b))!=-1) {
fos.write(b,0,len);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}finally {
if(fos!=null) {
try {
fos.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(fis!=null) {
try {
fis.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
}