java獲取IP地址

最近在一個多系統集成的項目中，由於跳轉路徑含IP地址，每次IP改了重啟項目都得改好多地方，甚是麻煩。剛在網上了解到java獲取IP地址，給大家分享下：

首先要導入jar包

request.getRemoteAddr()，這種方法在大部分情況下都是有效的。但是在通過了Apache,Squid等反向代理軟件就不能獲取到客戶端的真實IP地址了。 

下面是我在網上了解到的方法

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; 
    }

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