「java查看地址」怎么查java文件在哪里
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如何用java获取本地ip地址
import java.net.Inet4Address;
import java.net.InetAddress;
import java.net.NetworkInterface;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;
/**
* @author Becolette
* @description TODO
* @date 2015-11-5 下午01:58:46
*/
public class IpAddress {
public static String find() {
ListString ips = new ArrayListString();
// 返回所有网络接口的一个枚举实例
Enumeration? allNetInterfaces = null;
try {
allNetInterfaces = NetworkInterface.getNetworkInterfaces();
} catch (SocketException e) {
e.printStackTrace();
}
InetAddress ip = null;
while (allNetInterfaces.hasMoreElements()) {
NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
EnumerationInetAddress addresses = netInterface.getInetAddresses();
while (addresses.hasMoreElements()) {
// 获得当前网络接口
ip = (InetAddress) addresses.nextElement();
if (ip != null ip instanceof Inet4Address ip.getHostAddress().indexOf(".") != -1) {
ips.add(ip.getHostAddress());
}
}
}
if (ips.size() == 1) {
return ips.get(0);
} else {
for (String ipa : ips) {
if (!"127.0.0.1".equals(ipa)) {
return ipa;
}
}
}
return MacAddress.find();
}
}
java如何查询本机ip地址和mac地址
// 获取mac地址
public static String getMacAddress() {
try {
EnumerationNetworkInterface allNetInterfaces = NetworkInterface.getNetworkInterfaces();
byte[] mac = null;
while (allNetInterfaces.hasMoreElements()) {
NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
if (netInterface.isLoopback() || netInterface.isVirtual() || !netInterface.isUp()) {
continue;
} else {
mac = netInterface.getHardwareAddress();
if (mac != null) {
StringBuilder sb = new StringBuilder();
for (int i = 0; i mac.length; i++) {
sb.append(String.format("%02X%s", mac[i], (i mac.length - 1) ? "-" : ""));
}
if (sb.length() 0) {
return sb.toString();
}
}
}
}
} catch (Exception e) {
_logger.error("MAC地址获取失败", e);
}
return "";
}
// 获取ip地址
public static String getIpAddress() {
try {
EnumerationNetworkInterface allNetInterfaces = NetworkInterface.getNetworkInterfaces();
InetAddress ip = null;
while (allNetInterfaces.hasMoreElements()) {
NetworkInterface netInterface = (NetworkInterface) allNetInterfaces.nextElement();
if (netInterface.isLoopback() || netInterface.isVirtual() || !netInterface.isUp()) {
continue;
} else {
EnumerationInetAddress addresses = netInterface.getInetAddresses();
while (addresses.hasMoreElements()) {
ip = addresses.nextElement();
if (ip != null ip instanceof Inet4Address) {
return ip.getHostAddress();
}
}
}
}
} catch (Exception e) {
_logger.error("IP地址获取失败", e);
}
return "";
}
希望能帮助到你
java IP查询方法
Java编程查询IP地址归属地，可以调用淘宝提供的service查询，并且解析http请求返回的json串，代码如下：
package getAddressByIp;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import net.sf.json.JSONObject;
public class GetAddressByIp
{
/**
*
* @param IP
* @return
*/
public static String GetAddressByIp(String IP){
String resout = "";
try{
String str = getJsonContent(""+IP);
System.out.println(str);
JSONObject obj = JSONObject.fromObject(str);
JSONObject obj2 = (JSONObject) obj.get("data");
String code = (String) obj.get("code");
if(code.equals("0")){
resout = obj2.get("country")+"--" +obj2.get("area")+"--" +obj2.get("city")+"--" +obj2.get("isp");
}else{
resout = "IP地址有误";
}
}catch(Exception e){
e.printStackTrace();
resout = "获取IP地址异常："+e.getMessage();
}
return resout;
}
public static String getJsonContent(String urlStr)
{
try
{// 获取HttpURLConnection连接对象
URL url = new URL(urlStr);
HttpURLConnection httpConn = (HttpURLConnection) url.openConnection();
// 设置连接属性
httpConn.setConnectTimeout(3000);
httpConn.setDoInput(true);
httpConn.setRequestMethod("GET");
// 获取相应码
int respCode = httpConn.getResponseCode();
if (respCode == 200)
{
return ConvertStream2Json(httpConn.getInputStream());
}
}
catch (MalformedURLException e)
{
e.printStackTrace();
}
catch (IOException e)
{
e.printStackTrace();
}
return "";
}
private static String ConvertStream2Json(InputStream inputStream)
{
String jsonStr = "";
// ByteArrayOutputStream相当于内存输出流
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
// 将输入流转移到内存输出流中
try
{
while ((len = inputStream.read(buffer, 0, buffer.length)) != -1)
{
out.write(buffer, 0, len);
}
// 将内存流转换为字符串
jsonStr = new String(out.toByteArray());
}
catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return jsonStr;
}
}
怎么查看java中字符串的内存地址
java中不建议直接获取字符串内存地址，因为java不像c语言，获取内存地址是C语言的强项，java的弱项。但是java内存地址还是有一个应用场景，就是判断两个字符串内存地址是否相等来判断是否是同一个对象，用双等号“==”来比较的。参考代码如下：
public class Test01 {
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
String str1="abc";
String str2=new String("abc");
System.out.println(str1 == str2);//输出false
}
}
JAVA怎么获取IP地址
这个是获取不到的，因为有代理、端口映射等等转发情况的存在。为什么不保存相对路径/域名/或者在服务器上某个配置文件中配置域名/数据库中一个表/数据库中某个字段保存当前服务器的ip地址呢？
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