java查詢ip

⑴ java IP查詢方法

Java編程查詢IP地址歸屬地，可以調用淘寶提供的service查詢，並且解析http請求返回的json串，代碼如下：

packagegetAddressByIp;
importjava.io.ByteArrayOutputStream;
importjava.io.IOException;
importjava.io.InputStream;
importjava.net.HttpURLConnection;
importjava.net.MalformedURLException;
importjava.net.URL;
importnet.sf.json.JSONObject;

publicclassGetAddressByIp
{
/**
*
*@paramIP
*@return
*/
(StringIP){
Stringresout="";
try{
Stringstr=getJsonContent("http://ip.taobao.com/service/getIpInfo.php?ip="+IP);
System.out.println(str);
JSONObjectobj=JSONObject.fromObject(str);
JSONObjectobj2=(JSONObject)obj.get("data");
Stringcode=(String)obj.get("code");
if(code.equals("0")){
resout=obj2.get("country")+"--"+obj2.get("area")+"--"+obj2.get("city")+"--"+obj2.get("isp");
}else{
resout="IP地址有誤";
}
}catch(Exceptione){

e.printStackTrace();
resout="獲取IP地址異常："+e.getMessage();
}
returnresout;

}

(StringurlStr)
{
try
{//獲取HttpURLConnection連接對象
URLurl=newURL(urlStr);
HttpURLConnectionhttpConn=(HttpURLConnection)url.openConnection();
//設置連接屬性
httpConn.setConnectTimeout(3000);
httpConn.setDoInput(true);
httpConn.setRequestMethod("GET");
//獲取相應碼
intrespCode=httpConn.getResponseCode();
if(respCode==200)
{
returnConvertStream2Json(httpConn.getInputStream());
}
}
catch(MalformedURLExceptione)
{
e.printStackTrace();
}
catch(IOExceptione)
{
e.printStackTrace();
}
return"";
}

(InputStreaminputStream)
{
StringjsonStr="";
//ByteArrayOutputStream相當於內存輸出流
ByteArrayOutputStreamout=newByteArrayOutputStream();
byte[]buffer=newbyte[1024];
intlen=0;
//將輸入流轉移到內存輸出流中
try
{
while((len=inputStream.read(buffer,0,buffer.length))!=-1)
{
out.write(buffer,0,len);
}
//將內存流轉換為字元串
jsonStr=newString(out.toByteArray());
}
catch(IOExceptione)
{
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
returnjsonStr;
}
}

⑵ JAVA查找本機ip地址

注意第九行：InetAddress host_address = ....; 這說明host_address 本身是一個InetAddress類型的對象而不是String類型，所以要用toString（）轉換成String類型才能被String類型的str接收。這是嚴格意義上按照規范來講。但如果你不用toString的話應該也可以，會默認把它轉成String類型的。

⑶ java如何獲取用戶真實的ip

1、如果伺服器如果沒有採用反向代理，而且客戶端沒有用正向代理的話，那麼可以獲取客戶端的真實IP地址request.getRemoteAddr()

2、如果伺服器如果沒有採用反向代理，而且客戶端有用正向代理的話，那麼通過request.getRemoteAddr()獲取客戶端的IP地址是客戶端 的代理伺服器的地址，並不是客戶端的真實地址，

3、如果客戶端使用的是多層代理的話，伺服器獲得的客戶端地址是客戶端的最外圍代理伺服器的地址如果伺服器如果採用反向代理伺服器，不管客戶端採用的是何種方式訪問伺服器。

//獲得客戶端真實IP地址的方法一：
publicStringgetRemortIP(HttpServletRequestrequest){
if(request.getHeader("x-forwarded-for")==null){
returnrequest.getRemoteAddr();
}
returnrequest.getHeader("x-forwarded-for");
}
//獲得客戶端真實IP地址的方法二：
publicStringgetIpAddr(HttpServletRequestrequest){
Stringip=request.getHeader("x-forwarded-for");
if(ip==null||ip.length()==0||"unknown".equalsIgnoreCase(ip)){
ip=request.getHeader("Proxy-Client-IP");
}
if(ip==null||ip.length()==0||"unknown".equalsIgnoreCase(ip)){
ip=request.getHeader("WL-Proxy-Client-IP");
}
if(ip==null||ip.length()==0||"unknown".equalsIgnoreCase(ip)){
ip=request.getRemoteAddr();
}
returnip;
}

⑷ java中獲取本地IP地址

方法如下：
方法一，使用CMD命令：
public static String getLocalIPForCMD(){
StringBuilder sb = new StringBuilder();
String command = "cmd.exe /c ipconfig | findstr IPv4";
try {
Process p = Runtime.getRuntime().exec(command);
BufferedReader br = new BufferedReader(new InputStreamReader(p.getInputStream()));
String line = null;
while((line = br.readLine()) != null){
line = line.substring(line.lastIndexOf(":")+2,line.length());
sb.append(line);
}
br.close();
p.destroy();
} catch (IOException e) {
e.printStackTrace();
}
return sb.toString();
}
方法二，使用Java方法：
public static String getLocalIPForJava(){
StringBuilder sb = new StringBuilder();
try {
Enumeration<NetworkInterface> en = NetworkInterface.getNetworkInterfaces();
while (en.hasMoreElements()) {
NetworkInterface intf = (NetworkInterface) en.nextElement();
Enumeration<InetAddress> enumIpAddr = intf.getInetAddresses();
while (enumIpAddr.hasMoreElements()) {
InetAddress inetAddress = (InetAddress) enumIpAddr.nextElement();
if (!inetAddress.isLoopbackAddress() && !inetAddress.isLinkLocalAddress()
&& inetAddress.isSiteLocalAddress()) {
sb.append(inetAddress.getHostAddress().toString()+"\n");
}
}
}
} catch (SocketException e) { }
return sb.toString();
}

⑸ Java怎樣獲取當前機器外網IP

java獲取本機的外網ip示例：
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
* 獲取本機外網IP地址
* 思想是訪問網站http://checkip.dyndns.org/，得到返回的文本後解析出本機在外網的IP地址
* @author pieryon
*
*/
public class ExternalIpAddressFetcher {
// 外網IP提供者的網址
private String externalIpProviderUrl;

// 本機外網IP地址
private String myExternalIpAddress;

public ExternalIpAddressFetcher(String externalIpProviderUrl) {
this.externalIpProviderUrl = externalIpProviderUrl;

String returnedhtml = fetchExternalIpProviderHTML(externalIpProviderUrl);

parse(returnedhtml);
}

/**
* 從外網提供者處獲得包含本機外網地址的字元串
* 從http://checkip.dyndns.org返回的字元串如下
* <html><head><title>Current IP Check</title></head><body>Current IP Address: 123.147.226.222</body></html>
* @param externalIpProviderUrl
* @return
*/
private String fetchExternalIpProviderHTML(String externalIpProviderUrl) {
// 輸入流
InputStream in = null;

// 到外網提供者的Http連接
HttpURLConnection httpConn = null;

try {
// 打開連接
URL url = new URL(externalIpProviderUrl);
httpConn = (HttpURLConnection) url.openConnection();

// 連接設置
HttpURLConnection.setFollowRedirects(true);
httpConn.setRequestMethod("GET");
httpConn.setRequestProperty("User-Agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)");

// 獲取連接的輸入流
in = httpConn.getInputStream();
byte[] bytes=new byte[1024];// 此大小可根據實際情況調整

// 讀取到數組中
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead=in.read(bytes, offset, bytes.length-offset)) >= 0) {
offset += numRead;
}

// 將位元組轉化為為UTF-8的字元串
String receivedString=new String(bytes,"UTF-8");

// 返回
return receivedString;
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
in.close();
httpConn.disconnect();
} catch (Exception ex) {
ex.printStackTrace();
}
}

// 出現異常則返回空
return null;
}

/**
* 使用正則表達式解析返回的HTML文本,得到本機外網地址
* @param html
*/
private void parse(String html){
Pattern pattern=Pattern.compile("(\\d{1,3})[.](\\d{1,3})[.](\\d{1,3})[.](\\d{1,3})", Pattern.CASE_INSENSITIVE);
Matcher matcher=pattern.matcher(html);
while(matcher.find()){
myExternalIpAddress=matcher.group(0);
}
}

/**
* 得到本機外網地址,得不到則為空
* @return
*/
public String getMyExternalIpAddress() {
return myExternalIpAddress;
}

public static void main(String[] args){
ExternalIpAddressFetcher fetcher=new ExternalIpAddressFetcher("http://checkip.dyndns.org/");

System.out.println(fetcher.getMyExternalIpAddress());
}
}