大学IT网 - 最懂大学生的IT学习网站! QQ资料交流群:367606806
当前位置:大学IT网 > Java技巧 > Java手动配置某一范围内IP访问

Java手动配置某一范围内IP访问

关键词:JavaJava手动配置某一范围内IP访问  阅读(686) 赞(13)

[摘要]本文主要是对Java手动配置某一范围内IP访问的讲解,希望对大家学习Java手动配置某一范围内IP访问有所帮助。

  说明

  很多的Web系统都经常有这样的需求以保证系统安全,限制IP登录,例如在某个局域网中只允许一定范围内IP登录系统,或者不允许外网访问。

  如只允许192.168.24.10---192.168.24.255范围内IP地址访问

  IP地址分类

  在说到关于IP地址的问题时,首先,要了解IP分类,IP一般分为A、B、C、D、E五类,我们常说的192.168.*.*,是属于C类,该类主要适用于小型网络,比如我们学校的局域网。

  IP地址范围从192.168.0.0到192.168.255.255,不包括这两个地址,他们属于保留地址。

  限制示例

  这个实例写在了Struts的Action方法里面,当然也可以拿出来,写在Filter里,这样可以通过简单配置就可以实现禁止客户端访问。

  LoginAction

  package com.bjpowernode.drp.web.actions;

  import java.util.Arrays;

  import javax.servlet.http.HttpServletRequest;

  import javax.servlet.http.HttpServletResponse;

  import org.apache.struts.action.Action;

  import org.apache.struts.action.ActionForm;

  import org.apache.struts.action.ActionForward;

  import org.apache.struts.action.ActionMapping;

  import com.bjpowernode.drp.web.forms.LoginActionForm;

  /**

  * 登录Action

  * 负责取得表单数据、调用业务逻辑、返回转向信息

  *

  * @author Administrator

  *

  */

  public class LoginAction extends Action {

  @Override

  public ActionForward execute(ActionMapping mapping, ActionForm form,

  HttpServletRequest request, HttpServletResponse response)

  throws Exception {

  //取得表单数据

  LoginActionForm laf=(LoginActionForm)form;

  //取得用户名,密码

  String username=laf.getUsername();

  String password=laf.getPassword();

  //转向对象

  ActionForward actionForward=null;

  //判断用户名,密码是否正确

  if ("admin".equals(username) && "admin".equals(password)) {

  //得到远程客户端IP地址

  String remoteAddr=request.getRemoteAddr();

  //将客户端IP地址以“.”分割为数组remoteAddrs[1]);

  String[]  remoteAddrs=remoteAddr.split("\\.");

  //从配置文件中取得IP范围 ,四个数组分别保存的IP地址四部分的上界和下界

  String[] ipOne=request.getSession().getServletContext().getInitParameter("ip-one").split(",");

  String[] ipTwo=request.getSession().getServletContext().getInitParameter("ip-two").split(",");

  String[] ipThree=request.getSession().getServletContext().getInitParameter("ip-three").split(",");

  String[] ipFour=request.getSession().getServletContext().getInitParameter("ip-four").split(",");

  //取得第四部分的上下界

  int m=Integer.parseInt(ipFour[0]);

  int n=Integer.parseInt(ipFour[1]);

  //判断客户端IP地址是否在设置范围内

  if (ipOne[0].equals(remoteAddrs[0]) && ipTwo[0].equals(remoteAddrs[1]) && ipThree[0].equals(remoteAddrs[2])) {

  for(int i=m;i<=n;i++) {

  if (Integer.parseInt(remoteAddrs[3])==i) {

  //登录成功

  request.getSession().setAttribute("user", username);

  actionForward= mapping.findForward("success");

  }

  }

  actionForward= mapping.findForward("ipError");

  }

  }else {

  //登录失败

  actionForward= mapping.findForward("index");

  }

  return actionForward;

  }

  }

  package com.bjpowernode.drp.web.actions;

  import java.util.Arrays;

  import javax.servlet.http.HttpServletRequest;

  import javax.servlet.http.HttpServletResponse;

  import org.apache.struts.action.Action;

  import org.apache.struts.action.ActionForm;

  import org.apache.struts.action.ActionForward;

  import org.apache.struts.action.ActionMapping;

  import com.bjpowernode.drp.web.forms.LoginActionForm;

  /**

 

  * 登录Action

  * 负责取得表单数据、调用业务逻辑、返回转向信息

  *

  * @author Administrator

  *

  */

  public class LoginAction extends Action {

  @Override

  public ActionForward execute(ActionMapping mapping, ActionForm form,

  HttpServletRequest request, HttpServletResponse response)

  throws Exception {

  //取得表单数据

  LoginActionForm laf=(LoginActionForm)form;

  //取得用户名,密码

  String username=laf.getUsername();

  String password=laf.getPassword();

  //转向对象

  ActionForward actionForward=null;

  //判断用户名,密码是否正确

  if ("admin".equals(username) && "admin".equals(password)) {

  //得到远程客户端IP地址

  String remoteAddr=request.getRemoteAddr();

  //将客户端IP地址以“.”分割为数组remoteAddrs[1]);

  String[]  remoteAddrs=remoteAddr.split("\\.");

  //从配置文件中取得IP范围 ,四个数组分别保存的IP地址四部分的上界和下界

  String[] ipOne=request.getSession().getServletContext().getInitParameter("ip-one").split(",");

  String[] ipTwo=request.getSession().getServletContext().getInitParameter("ip-two").split(",");

  String[] ipThree=request.getSession().getServletContext().getInitParameter("ip-three").split(",");

  String[] ipFour=request.getSession().getServletContext().getInitParameter("ip-four").split(",");

  //取得第四部分的上下界

  int m=Integer.parseInt(ipFour[0]);

  int n=Integer.parseInt(ipFour[1]);

  //判断客户端IP地址是否在设置范围内

  if (ipOne[0].equals(remoteAddrs[0]) && ipTwo[0].equals(remoteAddrs[1]) && ipThree[0].equals(remoteAddrs[2])) {

  for(int i=m;i<=n;i++) {

  if (Integer.parseInt(remoteAddrs[3])==i) {

  //登录成功

  request.getSession().setAttribute("user", username);

  actionForward= mapping.findForward("success");

  }

  }

  actionForward= mapping.findForward("ipError");

  }

  }else {

  //登录失败

  actionForward= mapping.findForward("index");

  }

  return actionForward;

  }

  }

  Web.xml配置

  <?xml version="1.0" encoding="UTF-8"?>

  <web-app version="2.4"

  xmlns="java.sun.com/xml/ns/j2ee"

  xmlns:xsi="w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="java.sun.com/xml/ns/j2ee

  java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

  <!-- 例如我的ip地址为192.168.24.165,并不在设置范围内;下标范围是192.168.24.1-164 -->

  <context-param>

  <param-name>ip-one</param-name>

  <param-value>192</param-value>

  </context-param>

  <context-param>

  <param-name>ip-two</param-name>

  <param-value>168</param-value>

  </context-param>

  <context-param>

  <param-name>ip-three</param-name>

  <param-value>24</param-value>

  </context-param>

  <context-param>

 

  <param-name>ip-four</param-name>

  <param-value>1,164</param-value>

  </context-param>

  </web-app>

  <?xml version="1.0" encoding="UTF-8"?>

  <web-app version="2.4"

  xmlns="java.sun.com/xml/ns/j2ee"

  xmlns:xsi="w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="java.sun.com/xml/ns/j2ee

  java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

  <!-- 例如我的ip地址为192.168.24.165,并不在设置范围内;下标范围是192.168.24.1-164 -->

  <context-param>

  <param-name>ip-one</param-name>

  <param-value>192</param-value>

  </context-param>

  <context-param>

  <param-name>ip-two</param-name>

  <param-value>168</param-value>

  </context-param>

  <context-param>

  <param-name>ip-three</param-name>

  <param-value>24</param-value>

  </context-param>

  <context-param>

  <param-name>ip-four</param-name>

  <param-value>1,164</param-value>

  </context-param>

  </web-app>



相关评论