JAVA访问URL：


package Test;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.awt.Desktop;

public class URLTest {

    public static void main(String[] args) {
		String urlStr = "http://www.baidu.com";  
		URL url;
		try {
		    url = new URL(urlStr);
		    URLConnection URLconnection = url.openConnection();  
		    HttpURLConnection httpConnection = (HttpURLConnection)URLconnection;  
		    int responseCode = httpConnection.getResponseCode();  
		    if (responseCode == HttpURLConnection.HTTP_OK) {  
		        System.err.println("成功");
		        InputStream urlStream = httpConnection.getInputStream();  
		        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlStream));  
		        String sCurrentLine = "";  
		        String sTotalString = "";  
		        while ((sCurrentLine = bufferedReader.readLine()) != null) {  
		            sTotalString += sCurrentLine;  
		        }  
		        System.err.println(sTotalString); 	
		        runBroswer(urlStr);
		    }else{
		        System.err.println("失败");
		     }
		} catch (Exception e) {
		    e.printStackTrace();
		}  
              
    }
    
    public static void runBroswer(String webSite) {
        try {
            Desktop desktop = Desktop.getDesktop();
            if (desktop.isDesktopSupported() && desktop.isSupported(Desktop.Action.BROWSE)) {
                URI uri = new URI(webSite);
                desktop.browse(uri);
            }
        } catch (IOException ex) {
            ex.printStackTrace();
        } catch (URISyntaxException ex) {
            ex.printStackTrace();
        }
    }
}

import java.io.BufferedReader;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

/**

 * java访问url

 *

 */

public class JavaAccessUrl {

    public static String getUrlContent(String str){

        BufferedReader read = null;

        InputStream input = null;

        StringBuffer sb = new StringBuffer();

        String line = "";

        

        try {

            URL url = new URL(str);

            HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();


            httpConn.setConnectTimeout(5000);//设置连接服务器的超时时间

            httpConn.setReadTimeout(3000);//设置从服务器读取数据的超时时间

            httpConn.connect();

            input = httpConn.getInputStream();

            read = new BufferedReader(new InputStreamReader(input, "utf-8"));

            while ((line = read.readLine()) != null) {

                sb.append(line);

            }

        } catch (Exception e) {

            e.printStackTrace();

        }

        String result = sb.toString();

        return result;

    }

}

JAVA访问URL：
package Test;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLConnection;
import java.awt.Desktop;
public class URLTest {
public static void main(String[] args) {
String urlStr = "http://www.baidu.com";
URL url;
try {
url = new URL(urlStr);
URLConnection URLconnection = url.openConnection();
HttpURLConnection httpConnection = (HttpURLConnection)URLconnection;
int responseCode = httpConnection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
System.err.println("成功");
InputStream urlStream = httpConnection.getInputStream();
BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(urlStream));
String sCurrentLine = "";
String sTotalString = "";
while ((sCurrentLine = bufferedReader.readLine()) != null) {
sTotalString += sCurrentLine;
}
System.err.println(sTotalString);
runBroswer(urlStr);
}else{
System.err.println("失败");
}
} catch (Exception e) {
e.printStackTrace();
}
}
public static void runBroswer(String webSite) {
try {
Desktop desktop = Desktop.getDesktop();
if (desktop.isDesktopSupported() && desktop.isSupported(Desktop.Action.BROWSE)) {
URI uri = new URI(webSite);
desktop.browse(uri);
}
} catch (IOException ex) {
ex.printStackTrace();
} catch (URISyntaxException ex) {
ex.printStackTrace();
}
}
}

//访问URL
public class HttpUtil {
	public static String callWebPage(String urlStr, String postData) {
		return callWebPage(urlStr, postData, "UTF-8");
	}
	
	public static String callWebPage(String urlStr, String postData, String encoding) {

		String rStr = null;
		BufferedReader in = null;
		PrintWriter out = null;
		try {
			// 打开和URL之间的连接
			URLConnection conn = (new URL(urlStr)).openConnection();
			StringBuffer sb = new StringBuffer();
			// 设置通用的请求属性
			conn.setRequestProperty("accept", "*/*");
			conn.setRequestProperty("connection", "Keep-Alive");
			conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
			if (postData != null) {
				conn.setDoOutput(true);
				conn.setDoInput(true);
			}
			// 建立实际的连接
			conn.connect();
			// Post数据（如果非空的话， 获取URLConnection对象对应的输出流并输出参数）
			if (postData != null) {
				if(encoding==null || "".equals(encoding)){
					out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream()), true);
				}else{
					out = new PrintWriter(new OutputStreamWriter(conn.getOutputStream(),  encoding), true);
				}
				out.print(postData);
				out.flush();
			}
			// 获取所有响应头字段
			// Map<String, List<String>> map = connection.getHeaderFields();
			// for (String key : map.keySet()) { System.out.println(key +
			// " <== " + map.get(key)); }
			// 定义 BufferedReader输入流来读取URL的响应
			if(encoding==null || "".equals(encoding)){
				in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
			}else{
				in = new BufferedReader(new InputStreamReader(conn.getInputStream(),  encoding));
			}
			String line;
			while ((line = in.readLine()) != null) {
				sb.append(line);
			}
			rStr = sb.toString();
		} catch (Exception e) {
			LogUtil.exception(e);
		} finally {
			try {
				if (out != null) {
					out.close();
				}
			} catch (Exception ee) {
			}
			try {
				if (in != null) {
					in.close();
				}
			} catch (Exception ee) {
			}
		}
		return rStr;
	}
}