根据URL解析出文件目录

package com;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.InputStreamReader;
import java.net.URL;
public class txt {
//保存路径
private static String basePath = "E://";

/**
* @param args
*/
public static void main(String[] args) {
String urls = "http://ajava.org/course/java/";
URL uls;
try {
//校验URL 的合法性
if(true){
uls = new URL(urls);
basePath += uls.getHost();

File file = new File(basePath);
if(!file.isDirectory()){file.mkdir();}

for(int i= 12487;i<17920;i++){
uls = new URL(urls+i+".html");
alysisUrl(uls);
}
//alysisUrl(uls);
}
} catch (Exception e) {
System.out.println("Error："+e.getMessage());
}
}
//URL解析
public static void alysisUrl(URL url){
try {
//目录
String path = basePath+url.getFile().substring(0, url.getFile().lastIndexOf("/"))+"/";

File file = new File(path);
if(!file.isDirectory()){file.mkdirs();}

//文件
String fileName = url.getFile().substring(url.getFile().lastIndexOf("/")+1);
if("".equals(fileName)){
fileName = "index.html";
}else{
if(fileName.lastIndexOf(".") > 0){
//fileName = fileName.substring(0,fileName.lastIndexOf(".")) + ".html";
fileName = fileName.substring(0,fileName.lastIndexOf("."))+System.currentTimeMillis()+".html";
}else{
fileName = fileName.substring(0) + ".html";
}
}

/*查找文件，如果不存在，就创建*/
File newFile = new File(path+fileName);
if(!newFile.exists()){
//newFile.createNewFile();

//读取内存流数据，保存到文件
String currentLine = null;
StringBuffer sb = new StringBuffer();

BufferedWriter out = new BufferedWriter(new FileWriter(path+fileName));
BufferedReader reader = new BufferedReader(new InputStreamReader(url.openStream()));
while((currentLine = reader.readLine()) != null) {
sb.append(currentLine);
}
reader.close();
out.write(sb.toString());
out.newLine();
out.close();
}

System.out.println(path + " "+fileName);
} catch (Exception e) {
System.out.println("Error："+e.getMessage());
}
}
//URL校验
public static boolean checkUrl(String url){

try {
String fileName = url.substring(url.lastIndexOf("/")+1);
if(fileName.indexOf(".") > 0){
if(".html".equals(fileName.substring(fileName.lastIndexOf(".")))){return true;}
if(".shtml".equals(fileName.substring(fileName.lastIndexOf(".")))){return true;}
return false;

}else{return true;}
}catch (RuntimeException e) {return false;}
}
}