URL 获取网络资源

URL 获取网络资源

package com.itheima.net;

import java.io.BufferedInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import java.net.URLConnection;

public class TextURL {

	/**
	 * @param args
	 * @throws Exception 
	 */
	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		String imageFile="http://www.iteye.com/upload/logo/user/715302/3e63bcb1-8e77-369f-9e65-e97017c47322.jpg?1343613979";
		String htmlFile="http://takeme.iteye.com/";
		String host="http://www.iteye.com/";
		String file="/index.html";
		System.out.println("===============1.获取URL指定图像资源信息");
		getImageResourceByURL(imageFile);
		System.out.println("===============2.获取URL指定的HTML资源信息");
		getHtmlResourceByURL(htmlFile);
		System.out.println("===============3.根据URL创建读对象读取网页内容");
		getHTMLResouce(htmlFile);
		System.out.println("===============4.根据URL创建输入流读取网页内容");
		getResourceOfHtml(htmlFile);
		System.out.println("===============5.判断Java所支持的URL类型");
		supportURLType(host, file);
	}

	public static void getImageResourceByURL(String imageFile) throws Exception{
		URL url=new URL(imageFile); 
		Object obj=url.getContent(); //获得此URL的内容
		System.out.println(obj.getClass().getName());//显示名称
	}
	//根据制定的URL获取资源
	public static void getHtmlResourceByURL(String htmlFile) throws Exception{
		URL url=new URL(htmlFile);
		URLConnection uc=url.openConnection();  //创建远程对象的连接对象
		uc.setRequestProperty("Charset", "UTF-8");  //好像没有用  
		InputStream in=uc.getInputStream(); //打开连接 读取输入流

		int c;
		while ((c=in.read())!=-1) {
			System.out.print((char)c);
		}
		System.out.println();
		in.close();
	}

	//读取URL指定的网页内容
	public static void getHTMLResouce(String htmlFile) throws Exception{
		URL url=new URL(htmlFile);
		Reader reader=new InputStreamReader(new BufferedInputStream(url.openStream()),"UTF-8");
		int c;
		while ((c=reader.read())!=-1) {
			System.out.print((char)c);

		}
		System.out.println();
		reader.close();

	}
	//读取URL制定的网页内容
	public static void getResourceOfHtml(String htmlFile) throws Exception{
		URL url=new URL(htmlFile);

		InputStream in =url.openStream();
		int c;
		while ((c=in.read())!=-1) {
			System.out.print((char)c);
		}
		System.out.println();
		in.close();
	}

	public static void supportURLType(String host,String file){
		String [] schemes={"http","https","ftp","mailto","telnet","file","ldap",
				"gopher","jdbc","rmi","jndi","jar","doc","netdoc","nfs","verbatim","finger","daytime","systemrecource"};
		for (int i = 0; i < schemes.length; i++) {
			try {
				URL u=new URL(schemes[i],host,file);
				System.out.println(schemes[i]+"是java所支持的URL类型\r\n");
			} catch (Exception e) {
				System.out.println(schemes[i]+"不是java所支持的URL类型\r\n");
			}
		}


	}


}