利用Java获取ip地址

方法1

public static String getIp2(HttpServletRequest request) {
String ip = request.getHeader("X-Forwarded-For");
if (ip != null && !"unKnown".equalsIgnoreCase(ip)) {
// 多次反向代理后会有多个ip值，第一个ip才是真实ip
int index = ip.indexOf(",");
if (index != -1) {
return ip.substring(0, index);
} else {
return ip;
}
}
ip = request.getHeader("X-Real-IP");
if (ip != null && !"unKnown".equalsIgnoreCase(ip)) {
return ip;
}
return request.getRemoteAddr();
}

方法2.

public static String getIp(HttpServletRequest request) {
String remoteAddr = request.getRemoteAddr();
String forwarded = request.getHeader("X-Forwarded-For");
String realIp = request.getHeader("X-Real-IP");

String ip = null;
if (realIp == null) {
if (forwarded == null) {
ip = remoteAddr;
} else {
ip = remoteAddr + "/" + forwarded;
}
} else {
if (realIp.equals(forwarded)) {
ip = realIp;
} else {
ip = realIp + "/" + forwarded.replaceAll(", " + realIp, "");
}
}
return ip;
}

方法3

public static String getIp3(HttpServletRequest request) {
String remoteAddr = request.getRemoteAddr();
String forwarded = request.getHeader("X-Forwarded-For");
String realIp = request.getHeader("X-Real-IP");

String ip = null;
if (realIp == null) {
if (forwarded == null) {
ip = remoteAddr;
} else {
ip = remoteAddr + "/" + forwarded.split(",")[0];
}
} else {
if (realIp.equals(forwarded)) {
ip = realIp;
} else {
if (forwarded != null) {
forwarded = forwarded.split(",")[0];
}
ip = realIp + "/" + forwarded;
}
}
return ip;
}