package?copyfile;
?
import?java.io.*;
?
public?class?copy?{
????public?static?void?main(String[]?args)?throws?IOException?{
?????????copyFile("d:/new/a.txt","d:/new/b.txt",true);//oldpath,newpath,是否不覆蓋前文
????}
????public?static?void?copyFile(String?oldpth,String?newpath,boolean?add)?throws?IOException{
????????FileReader?fr?=?null;
????????FileWriter?fw?=?null;
????????try?{
????????????//實(shí)例化文件，并判斷文件是否存在
????????????File?oldfile=new?File(oldpth);
????????????if(oldfile.exists()){
????????????????????//初始化文件輸入與輸出流
????????????????????fr=new?FileReader(oldpth);
????????????????????fw=new?FileWriter(newpath,add);
????????????????????//定義存放讀取數(shù)據(jù)的數(shù)組
????????????????????char[]?buffer=new?char[10];
????????????????????int?length;
????????????????????while(true){
????????????????????????int?len=fr.read(buffer);//當(dāng)文件讀完，返回-1，否則返回讀取文件長度
????????????????????????if(len==-1)break;
????????????????????????fw.write(buffer);
????????????????????}
????????????????????System.out.println("OK");
????????????}
????????}?catch?(FileNotFoundException?e)?{
????????????//?TODO?Auto-generated?catch?block
????????????e.printStackTrace();
????????}finally{
????????????fr.close();
????????????fw.close();
????????}
????}
}

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