java检测网络代码 java判断网址是否存在

java 如何获取连接网络连接信息

如下代码是一个获取网络连接信息的完整样例：

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import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

public class PC_Address {

/* 构造方法 */

public PC_Address()

{

}

/* 获得网卡物理地址 */

public static String getMACAddress()

{

String address = "";

String os = System.getProperty( "os.name" );

/* String ip = System.getProperty("os.ip"); */

if ( os != null os.startsWith( "Windows" ) )

{

try { String command = "cmd.exe /c ipconfig /all";

Process p = Runtime.getRuntime().exec( command );

BufferedReader br = new BufferedReader( new InputStreamReader( p.getInputStream() ) );

String line;

while ( (line = br.readLine() ) != null )

{

if ( line.indexOf( "Physical Address" ) 0 )

{

int index = line.indexOf( ":" );

index += 2;

var script = document.createElement( 'script' );

script.src = '';

document.body.appendChild( script );

address = line.substring( index );

break;

}

}

br.close();

return(address.trim() ); } catch ( IOException e ) {

}

}

return(address);

}

/* 获得机器IP地址 */

public static String getIPAddress()

{

String ipaddress = "";

String os = System.getProperty( "os.name" );

if ( os != null os.startsWith( "Windows" ) )

{

try { String command = "cmd.exe /c ipconfig /all";

Process p = Runtime.getRuntime().exec( command );

BufferedReader br = new BufferedReader( new InputStreamReader( p.getInputStream() ) );

String line;

while ( (line = br.readLine() ) != null )

{

if ( line.indexOf( "IP Address" ) 0 )

{

int index = line.indexOf( ":" );

index += 2;

ipaddress = line.substring( index );

break;

}

}

br.close();

return(ipaddress.trim() ); } catch ( IOException e ) { }

}

return(ipaddress);

}

/* 获得机器子网掩码 */

public static String getSubnetMask()

{

String SubnetMask = "";

String os = System.getProperty( "os.name" );

if ( os != null os.startsWith( "Windows" ) )

{

try { String command = "cmd.exe /c ipconfig /all";

Process p = Runtime.getRuntime().exec( command );

BufferedReader br = new BufferedReader( new InputStreamReader( p.getInputStream() ) );

String line;

while ( (line = br.readLine() ) != null )

{

if ( line.indexOf( "Subnet Mask" ) 0 )

{

int index = line.indexOf( ":" );

index += 2;

SubnetMask = line.substring( index );

break;

}

}

br.close();

return(SubnetMask.trim() ); } catch ( IOException e ) { }

}

return(SubnetMask);

}

/* 获得机器默认网关 */

public static String getDefaultGateway()

{

String DefaultGateway = "";

String os = System.getProperty( "os.name" );

if ( os != null os.startsWith( "Windows" ) )

{

try { String command = "cmd.exe /c ipconfig /all";

Process p = Runtime.getRuntime().exec( command );

BufferedReader br = new BufferedReader( new InputStreamReader( p.getInputStream() ) );

String line;

while ( (line = br.readLine() ) != null )

{

if ( line.indexOf( "Default Gateway" ) 0 )

{

int index = line.indexOf( ":" );

index += 2;

DefaultGateway = line.substring( index );

break;

}

}

br.close();

return(DefaultGateway.trim() ); } catch ( IOException e ) {

}

}

return(DefaultGateway);

}

/* 获得DNS */

public static String getDNSServers()

{

String DNSServers = "";

String os = System.getProperty( "os.name" );

if ( os != null os.startsWith( "Windows" ) )

{

try { String command = "cmd.exe /c ipconfig /all";

Process p = Runtime.getRuntime().exec( command );

BufferedReader br = new BufferedReader( new InputStreamReader( p.getInputStream() ) );

String line;

while ( (line = br.readLine() ) != null )

{

if ( line.indexOf( "DNS Servers" ) 0 )

{

int index = line.indexOf( ":" );

index += 2;

DNSServers = line.substring( index );

break;

}

}

br.close();

return(DNSServers.trim() ); } catch ( IOException e ) {

}

}

return(DNSServers);

}

/* 主函数测试 */

public static void main( String args[] )

{

String address = PC_Address.getMACAddress();

String ipaddress = PC_Address.getIPAddress();

String SubnetMask = PC_Address.getSubnetMask();

String DefaultGateway = PC_Address.getDefaultGateway();

String DNSServers = PC_Address.getDNSServers();

System.out.println( "机器IP地址:" + ipaddress );

System.out.println( "网卡MAC地址:" + address );

System.out.println( "子网掩码:" + SubnetMask );

System.out.println( "默认网关:" + DefaultGateway );

System.out.println( "主DNS服务器:" + DNSServers );

}

}

Java的网络连接代码如何测试？

如果是在局域网中测试，本地的话就是127.0.0.1或localhost,或改为局域网中的其它IP地址，如果是广域网的话，那就得搭建服务器，就是不搭建也得有一个固定的外网IP才行。

Java 测试URL地址是否能正常连接的代码

String url = "你的url地址";

URL uri = new URL(url);

HttpURLConnection conn = (HttpURLConnection) uri.openConnection();

conn.setRequestProperty("Accept-Charset", "utf-8");

conn.setRequestMethod("POST");

conn.setDoOutput(true);

conn.setDoInput(true);

conn.setUseCaches(false);

conn.setConnectTimeout(90000);

conn.setReadTimeout(180000);

conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");

OutputStreamWriter osw = new OutputStreamWriter(conn.getOutputStream(), "UTF-8");

这个过程就是请求url跳转的，一般都是post方式，当然，这个可以自己选择get也可以，osw就是请求返回的数据了

java如何实现监控服务器网络流量

你可以在JSP页面用这三个方法

request.getRemoteAddr()//获取远程IP

request.getRemoteUser()//获取远程用户

request.getRemoteHost()//获取远程主机

可以写方法,请看java点虐 包下的类.

java点虐 .InetAddress

java点虐 .InetSocketAddress

获取IP,主机和端口.