java之 ------ 檔案拷貝

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import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;public class FileCopyStream {public static void main(String[] args) {//fileCopy0("b.dat","d:/ex/a/","d:/ex/b/");//fileCopy1("b.dat","d:/ex/a/","d:/ex/b/");//fileCopy2("b.dat","d:/ex/a/","d:/ex/b/");fileCopy2("1.mp3","d:/ex/a/","d:/ex/b/");//fileCopy3("c.mp3","d:/ex/a/","d:/ex/b/");//fileCopy3("d.txt","d:/ex/a/","d:/ex/b/");}private static void fileCopy0(String fileName, String dir1,String dir2){try {FileInputStream in = new FileInputStream(dir1+fileName);FileOutputStream out = new FileOutputStream(dir2+fileName);byte[] buffer = new byte[512];in.read(buffer);out.write(buffer);} catch (FileNotFoundException e) {e.printStackTrace();} catch (Exception e) {}}//學習關流private static void fileCopy1(String fileName, String dir1,String dir2){FileInputStream in = null;FileOutputStream out = null;try {in = new FileInputStream(dir1+fileName);out = new FileOutputStream(dir2+fileName);byte[] buffer = new byte[512];in.read(buffer);out.write(buffer);} catch (FileNotFoundException e) {e.printStackTrace();} catch (Exception e) {}finally{try {in.close();out.close();} catch (IOException e) {throw new RuntimeException("檔案無法關閉");}}}//能夠拷貝大檔案private static void fileCopy2(String fileName, String dir1,String dir2){FileInputStream in = null;FileOutputStream out = null;try {in = new FileInputStream(dir1+fileName);out = new FileOutputStream(dir2+fileName);byte[] buffer = new byte[512];int num = 0;do{num = in.read(buffer);out.write(buffer,0,num);}while(num>=0);} catch (FileNotFoundException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}finally{try {in.close();out.close();} catch (IOException e) {throw new RuntimeException("檔案無法關閉");}}}//能夠拷貝大檔案private static void fileCopy3(String fileName, String dir1,String dir2){FileInputStream in = null;FileOutputStream out = null;try {in = new FileInputStream(dir1+fileName);out = new FileOutputStream(dir2+fileName);byte[] buffer = new byte[512];int num=0;while(in.available()>0){num = in.read(buffer);//最簡單的加密for(int i=0;i<num;i++){buffer[i] = (byte)(buffer[i]+1);}out.write(buffer,0,num);}} catch (FileNotFoundException e) {e.printStackTrace();} catch (Exception e) {}finally{try {in.close();out.close();} catch (IOException e) {throw new RuntimeException("檔案無法關閉");}}}}

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java之 ------ 檔案拷貝