Java在捕获异常时如何获取造成异常的ip

我想知道是谁造成的异常，Java在捕获异常时获取造成异常人所用电脑的ip

通过用户的请求头来获取用户的真实ip


public String getIpAddr(HttpServletRequest request) {
        String ip = 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();
        }
        if (!(null == ip || "".equals(ip.trim()) || "null".equalsIgnoreCase(ip.trim())) && ip.contains(",")) {
            ip = ip.split(",")[0];
        }
        return ip;
    }

加个HttpServletRequest request参数，然后：
String ip = request.getRemoteAddr();

可以参考下这个http://t.csdn.cn/zBvh8

img


要么自己 传HttpServletRequest 进来，从Header里面取；
要么从springframework 的 RequestContextHolder 里面的ThreadLocal 中自己获取 HttpServletRequest ，从里面取

可以不使用携带HttpSerlvetRequest参数，而是用RequestContextHolder来获取当前线程的request，不然个方法都要传个HttpServletRequest是很难受的，具体使用它的方式如下：

HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();

然后下面是获取用户真实IP的方法：

/**
     * 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址;
     */
    public static String getIpAddress(HttpServletRequest request) {
        // 获取请求主机IP地址,如果通过代理进来，则透过防火墙获取真实IP地址
        String ip = request.getHeader("X-Forwarded-For");

        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
            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.getHeader("HTTP_CLIENT_IP");
            }
            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getHeader("HTTP_X_FORWARDED_FOR");
            }
            if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
                ip = request.getRemoteAddr();
            }
        } else if (ip.length() > 15) {
            String[] ips = ip.split(",");
            for (String s : ips) {
                if (!("unknown".equalsIgnoreCase(s))) {
                    ip = s;
                    break;
                }
            }
        }
        return ip;
    }

将上面的方法放到一个工具类里，例如命名为HttpUtils.java中，每次在异常或者全局异常使用时可以像这样：

try{
    //正常逻辑代码
} catch(Exception e){
    HttpServletRequest request = ((ServletRequestAttributes)RequestContextHolder.getRequestAttributes()).getRequest();
    String requestIpAddress = HttpUtil.getIpAddress(request);  //获取请求的IP地址
    //相关异常处理
}