java获取外网ip地址

转自：http://blog.163.com/houjunchang_daxue/blog/static/13037938320134543310451/

/**

* 获取外网IP、归属地、操作系统

* @return

*/

public static String[] getIp(){

String[] obj = new String[3];

StringBuffer strForeignIP = new StringBuffer("");

StringBuffer strLocation = new StringBuffer("");

StringBuffer strOperatorMessageation = new StringBuffer("");

String ipAddress = "";

String ipLocation = "";

String ipSystem = "";

StringBuffer strUrl =new StringBuffer("http://www.cz88.net/ip/viewip778.aspx");

try{

URL url = new URL(strUrl.toString());

URLConnection context = url.openConnection();

InputStream in = context.getInputStream();

BufferedReader br = new BufferedReader(new InputStreamReader(in, "gb2312"));//防止读出来的是乱码



String s = "";

StringBuffer sb = new StringBuffer("");

while ((s = br.readLine()) != null) {

sb.append(s + "\r\n");

}

br.close();

String webContent = sb.toString();

if (null!=webContent && webContent.trim().length()>0){

String flagofForeignIPString = "IPMessage";

int startIP = webContent.indexOf(flagofForeignIPString) + flagofForeignIPString.length() + 2;

int endIP = webContent.indexOf("</span>", startIP);

strForeignIP.delete(0, webContent.length());

strForeignIP.append(webContent.substring(startIP, endIP));



String flagofLocationString = "AddrMessage";

int startLoc = webContent.indexOf(flagofLocationString)+ flagofLocationString.length() + 2;

int endLoc = webContent.indexOf("</span>", startLoc);

strLocation.delete(0, webContent.length());

strLocation.append(webContent.substring(startLoc, endLoc));



String flagoOperatorMessage = "OperatorMessage";

int startOpera = webContent.indexOf(flagoOperatorMessage)+ flagoOperatorMessage.length() + 2;

int endOpera = webContent.indexOf("</span>", startOpera);

strOperatorMessageation.delete(0, webContent.length());

strOperatorMessageation.append(webContent.substring(startOpera, endOpera));

}

}catch(Exception e){

System.out.println("IpUtil:get ip is failed:"+e.getMessage());

e.printStackTrace();

}

if(strForeignIP.toString().trim().length()<0){

ipAddress = "未知";

}else{

ipAddress = strForeignIP.toString();

}



if(strForeignIP.toString().trim().length()<0){

ipLocation = "未知";

}else{

ipLocation = strLocation.toString();

}



if(strForeignIP.toString().trim().length()<0){

ipSystem = "未知";

}else{

ipSystem = strOperatorMessageation.toString();

}

obj[0]=ipAddress;

obj[1]=ipLocation;

obj[2]=ipSystem;

return obj;

}