网络开发-获得html-优快云博客

本文介绍了一个使用Java实现的简单网页抓取工具。该工具利用HttpURLConnection获取网页内容，并通过自定义工具类将输入流转换为字符串。示例中演示了如何从指定URL抓取HTML内容并显示在一个Android应用的界面上。

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1:工具类

package cn.itcast.utils;

import java.io.ByteArrayOutputStream;
import java.io.InputStream;

public class StreamTool {

	/**
	 * 从输入流中获取数据
	 * @param inStream 输入流
	 * @return
	 * @throws Exception
	 */
	public static byte[] readInputStream(InputStream inStream) throws Exception{
		ByteArrayOutputStream outStream = new ByteArrayOutputStream();
		byte[] buffer = new byte[1024];
		int len = 0;
		while( (len=inStream.read(buffer)) != -1 ){
			outStream.write(buffer, 0, len);
		}
		inStream.close();
		return outStream.toByteArray();
	}
}

2：业务类

package cn.itcast.service;

import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

import cn.itcast.utils.StreamTool;

public class HtmlService {

	public static String getHtml(String path) throws Exception {
		URL url = new URL(path);
		HttpURLConnection conn = (HttpURLConnection)url.openConnection();
		conn.setRequestMethod("GET");
		conn.setConnectTimeout(5 * 1000);
		InputStream inStream = conn.getInputStream();//通过输入流获取html数据
		byte[] data = StreamTool.readInputStream(inStream);//得到html的二进制数据
		String html = new String(data, "gb2312");
		return html;
	}

}

3：主Activate

package cn.itcast.html;

import cn.itcast.service.HtmlService;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        TextView textView = (TextView)this.findViewById(R.id.textView);
        try {
         textView.setText(HtmlService.getHtml("http://www.sohu.com"));
  } catch (Exception e) {
   Log.e("MainActivity", e.toString());
   Toast.makeText(MainActivity.this, "网络连接失败", 1).show();
  }
        
    }
}