Java获取客户端ip和端口

“青枫江上秋帆远，白帝城边古木疏”
如果你的方法参数里面直接有request，像下面这样：

    @RequestMapping("/test.json")
    @ResponseBody
    public Map getIpAndLoginname(HttpServletRequest request, HttpServletResponse response){
        Map resultMap = new HashMap<>();
        return resultMap;
    }

这样的就可以直接通过request获取ip和端口

@RequestMapping("/test.json")
    @ResponseBody
    public Map<String,Object> getIpAndLoginname(HttpServletRequest request, HttpServletResponse response){
        Map<String,Object> resultMap = new HashMap<>();
        //获取IP
        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;
            }
        }
        resultMap.put("serverIp",ip);
        resultMap.put("serverPort",request.getRemotePort());    //端口
        resultMap.put("sessionId",request.getSession().getId());    //会话ID
        return resultMap;
    }

第二种情况，你的方法里面没有直接的request，那么，首先你需要获得request，然后再利用上面的方法获取ip和端口，下面的代码获取request：

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