Http方式获取网络数据

　　通过以下代码可以根据网址获取网页的html数据，安卓中获取网络数据的时候会用到，而且会用Java中的sax方式解析获取到数据。(sax解析主要是解析xml)具体代码如下：

package com.wyl;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class HttpDownloadTest {
	public static void main(String[] args) {
		StringBuffer sb = new StringBuffer();
		try {
			//创建url对象
			URL url = new URL("http://www.baidu.com");
			//创建connection
			URLConnection conn = url.openConnection();
			//使用io流读取数据
			InputStream ips = conn.getInputStream();
			InputStreamReader reader = new InputStreamReader(ips);
			BufferedReader br = new BufferedReader(reader);
//			String s = br.readLine();
			while(br.readLine()!=null){
				//返回读取出来的结果
				sb.append(br.readLine());
			}
			System.out.println(sb);
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
}

　　

实例2：

package wyl;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;


public class httpdownloadtest {
	public static void main(String[] args) {
//		getSDPath();
//		System.out.println("路径:"+getSDPath());
		System.out.println("xml:"+getXml("http://www.weibo.com"));
		System.out.println("======");
		System.out.println("xml:"+getXml("http://www.baidu.com"));
	}
	/**
	 * 获取sd卡路径
	 * @return
	 */
//	public static String getSDPath(){
//		return Environment.getExternalStorageDirectory().getPath();
//	}
	/**
	 * 根据网址获取转换后的xml
	 * @param dizhi
	 * @return
	 */
	public static String getXml(String dizhi){
		BufferedReader bufferedreader;
		String xml = "";
		StringBuffer sb = new StringBuffer();
		try {
			URL url = new URL(dizhi);
			//1 获取一个连接
			URLConnection conn = url.openConnection();
			//2 把inputStream封装成为BufferedReader,
			bufferedreader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
			while(bufferedreader.readLine()!=null){
				//3 从缓冲流里读出数据
				sb.append(bufferedreader.readLine());
			}
			//4 把StringBuffer转换为String 
			xml = sb.toString();
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return xml;
	}
	
}