Java资料复制（本地与网络资源）
趁休息的时间，写了个文件复制的小程序，以避免了从网上下载的繁琐过程和本地域内机器间文件复制带来一点方便。具体实现如下：
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package org.sunnysolong.io.file;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
/**
* Title: JavaTech<br>
* Description: File Handler Sample<br>
* Copyright: Copyright (c) 2011 <br>
* Create DateTime: Jul 14, 2011 9:30:28 AM <br>
* @author wangmeng
*/
public class FileCopy {
private FileCopy(){}
/**
* Execute specified file.
* TMD,this can occur the error sometime like this:
* @param file
*/
private static void open(String file){
try {
Runtime.getRuntime().exec("explorer " + file +"");
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Local copying.
* @param source
* @param destination
* @param open
*/
public static void localCopy(String source, String directory, boolean open){
InputStream is = null;
File src = null;
String path = null;
try {
src = new File(source);
is = new FileInputStream(src);
System.out.println("file size: " + (Double.parseDouble(String.valueOf(src.length())) / 1024 / 1024) + "MB");
path = directory + "\\" + source.substring(source.lastIndexOf('\\') + 1);
writeBytesIntoFile(convertToBytes(is), path);
if(open){
System.out.println("Opening the file " + path + " ...");
open(path);
}
} catch (FileNotFoundException e) {
e.printStackTrace();
}
}
/**
* Remote copying.
* @param source
* @param destination
* @param open
*/
private static void remoteCopy(String source, String directory, boolean open){
URL url = null;
URLConnection urlConn = null;
String path = null;
int contentLength = 0;
try {
url = new URL(source);
urlConn = url.openConnection();
urlConn.setDoInput(true);
urlConn.connect();
contentLength = urlConn.getContentLength();
System.out.println("file size: " + (Double.parseDouble(String.valueOf(contentLength)) / 1024 / 1024) + "MB");
if(contentLength == -1){
throw new Exception("TMD,the current net is a little busy, please try again later.");
}
path = directory + "\\" + source.substring(source.lastIndexOf('/') + 1);
writeBytesIntoFile(convertToBytes(urlConn.getInputStream()), path);
if(open){
System.out.println("Opening the file " + path + " ...");
open(path);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Copy key entrance.
* @param source
* @param destination
* @param open
*/
public static void copy(String source, String directory, boolean open){
if(source.startsWith("http://") || source.startsWith("https://")){
System.out.println("Copying the remote source " + source + " to the directory " + directory + " ...");
remoteCopy(source, directory, open);
System.out.println("Copying ended ...");
}else{
System.out.println("Copying the local source " + source + " to the directory " + directory + " ...");
localCopy(source, directory, open);
System.out.println("Copying ended ...");
}
}
/**
* Read input stream into a byte array and as a return value.
* @param is
* @return byte[]
*/
public static byte[] convertToBytes(InputStream is){
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] b = new byte[1024];
int len = 0;
try {
while((len = is.read(b)) != -1){
out.write(b, 0, len);
}
out.close();
} catch (IOException e) {
e.printStackTrace();
}
return out.toByteArray();
}
/**
* Write bytes into specified file.
* @param b
* @param path
* @return File: the current file.
*/
public static File writeBytesIntoFile(byte[] b, String path){
File file = null;
FileOutputStream fos = null;
try {
file = new File(path);
if(file.exists())
file.delete();
file.createNewFile();
fos = new FileOutputStream(file);
fos.write(b);
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
return file;
}
/**
* Copy image.
* @param source
* @param directory
*/
public static void imageCopy(String source, String directory, boolean open){
URL url = null;
HttpURLConnection conn = null;
String path = null;
try {
url = new URL(source);
conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setReadTimeout(2000);
System.out.println("image file length: " + conn.getContentLength());
path = directory + "\\" + source.substring(source.lastIndexOf('/') + 1);
writeBytesIntoFile(convertToBytes(conn.getInputStream()), path);
if(open){
open(path);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
public static void main(String[] args){
String source = "http://www.rubyist.net/~slagell/ruby/eval.txt";
FileCopy.copy(source, System.getProperty("user.home"), true);
}
}