webUtils

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
public class WebUtils {

/**

* 将字符串渲染到客户端

*

* @param response 渲染对象

* @param string   待渲染的字符串

*/

public static void renderString(HttpServletResponse response, String string) {

try {

response.setStatus(200);

response.setContentType("application/json");

response.setCharacterEncoding("utf-8");

response.getWriter().print(string);

} catch (IOException e) {

e.printStackTrace();

}

}
/**
 * 获取IP地址
 *
 * @param request
 * @return
 */
public static String getIpAddr(HttpServletRequest request) {
    String ip = request.getHeader("x-forwarded-for");
    if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
        ip = request.getHeader("X-Real-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.getRemoteAddr();
    }
    if ("0:0:0:0:0:0:0:1".equals(ip)) {
        ip = "127.0.0.1";
    }
    if (ip.split(",").length > 1) {
        ip = ip.split(",")[0];
    }
    return ip;
}

}