java 怎样得到用户输入的IP地址或网址

request.getRemoteAddr() 试试

下面转

　　public String getRemortIP(HttpServletRequest request) {
　　if (request.getHeader("x-forwarded-for") == null) {
　　return request.getRemoteAddr();
　　}
　　return request.getHeader("x-forwarded-for");
　　}
　　获得客户端真实IP地址的体例二：
　　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;
　　}

服务器上放段代码，把服务器机器的IP打印到页面就可以了，如果不想让用户看到，就用HTML注释掉或写成