package se.Day03;
import
java.io.ByteArrayInputStream;
import
java.io.ByteArrayOutputStream;
import
java.io.File;
import
java.io.FileInputStream;
import
java.io.FileOutputStream;
import
java.io.IOException;
import
java.io.InputStream;
import
java.io.ObjectInputStream;
import
java.io.ObjectOutputStream;
import
java.io.OutputStream;
/** IO 工具类，包含很多IO有关工具方法(静态方法)*/
public class IOUtils {
public static Object deepCopy(Object obj){
try{
ByteArrayOutputStream buf =
new ByteArrayOutputStream();
ObjectOutputStream out = new ObjectOutputStream(buf);
out.writeObject(obj);
out.close();
byte[] data = buf.toByteArray();
ObjectInputStream in =
new ObjectInputStream(
new ByteArrayInputStream(data));
Object copy = in.readObject();
in.close();
return copy;
}catch(Exception e){
e.printStackTrace();
throw new RuntimeException();
}
}
public static void cp(String src, String dst){
try{
InputStream in = new FileInputStream(src);
OutputStream out = new FileOutputStream(dst);
byte[] buf = new byte[2*1024];//2k byte
int n;
while((n=in.read(buf))!=-1){
out.write(buf, 0 ,n);
}
in.close();
out.close();
}catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
public static void cp1(String src, String dst){
try{
InputStream in = new FileInputStream(src);
OutputStream out = new FileOutputStream(dst);
int b;
while((b=in.read())!=-1){
out.write(b);
}
in.close();
out.close();
}catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
public static void print(File file){
try{
InputStream in = new FileInputStream(file);
int i = 1;
int b;
while((b=in.read())!=-1){
if(b<=0xf){//单位数补0
System.out.print("0");
}
System.out.println(Integer.toHexString(b)+" ");
if(i++%16==0){
System.out.println();
}
}
System.out.println();
in.close();//注意关闭哦,亲!
}catch (IOException e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
public static void print(byte[] buf){
//buf = {01000001,00001111,11010110,11010000}
int i = 1;
for(int b : buf){
b ;= 0xff;
if(b<=0xf){
System.out.print("0");
}
System.out.println(Integer.toHexString(b)+" ");
if(i++%16 == 0){
System.out.println();
}
}
System.out.println();
}
/** 将文件按照16进制输出到控制台上，每16个byte为一行*/
public static void print(String file){
try{
InputStream in = new FileInputStream(file);
int i = 1;
int b;
while((b=in.read())!=-1){
if(b<=0xf){
System.out.print("0");
}
System.out.print(Integer.toHexString(b));
if(i++%16 == 0){
System.out.println();
}
}
System.out.println();
in.close();
}catch(IOException e){
e.printStackTrace();
throw new RuntimeException(e);
}
}
}
