HttpServletRequest 获取ip

HttpServletRequest对象是Java Servlet规范中定义的一种接口，它封装了客户端请求的所有信息，包括请求头、请求参数、请求方法、请求URL等。要从HttpServletRequest对象中获取客户端的IP地址，可以使用以下通用代码：

String ipAddress = request.getHeader("X-Forwarded-For");

if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
    ipAddress = request.getHeader("Proxy-Client-IP");
}

if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
    ipAddress = request.getHeader("WL-Proxy-Client-IP");
}

if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
    ipAddress = request.getRemoteAddr();
}

上述代码首先尝试从请求头中获取IP地址，因为在一些代理服务器中，客户端的真实IP地址可能会被包含在X-Forwarded-For或Proxy-Client-IP或WL-Proxy-Client-IP等请求头中。如果无法从请求头中获取IP地址，则会使用request.getRemoteAddr()方法获取客户端的IP地址。

请注意，获取到的IP地址可能是客户端的真实IP地址，也可能是代理服务器的IP地址，具体情况取决于网络环境的配置。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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