java获取IP地址

最近在一个多系统集成的项目中，由于跳转路径含IP地址，每次IP改了重启项目都得改好多地方，甚是麻烦。刚在网上了解到java获取IP地址，给大家分享下：

首先要导入jar包

request.getRemoteAddr()，这种方法在大部分情况下都是有效的。但是在通过了Apache,Squid等反向代理软件就不能获取到客户端的真实IP地址了。 

下面是我在网上了解到的方法

方法一：

public String getIpAddr(HttpServletRequest request) { 
        String ip = request.getHeader("x-forwarded-for"); 
        if(ip == null || ip.length() == 0) { 
            ip = request.getRemoteAddr(); 
        } 
        return ip; 
    }

方法二：

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(); 
        } 
        return ip; 
    }

 来源：https://blog.csdn.net/lijunlinlijunlin/article/details/43714443