Question

很多人都在询问如何从客户端更改de IP，但我需要从服务器端执行此操作（如果可能的话）。

问题是我从HttpServletRequest.getRemoteAddr（）获取IP，但现在我们在IHS之前使用代理，这个IP总是带有代理IP，而不是真正的客户端IP。

代理在请求中的新特定标头中提供真实IP。

好的，我知道这听起来很简单，我只改变了获取IP的方式，并从代理提供的特定Header中获取IP。这是一个很好的解决方案，问题是我们必须改变很多类，并且我可以用另一种可能的方式思考，例如，在BaseClass中的Request中使用真实的IP更改一次IP，然后是每个人（谁扩展了BaseClass）正确地更新了IP。

那么，我能以某种方式这样做吗？

Answer 1

您需要添加一个创建HttpServletRequestWrapper的Filter。调整部署描述符。

部分：

ProxyFilter
ProxyRequestWrapper
的web.xml
ServletBehindProxy

ProxyFilter：

package testingThings.wrapperAndFilter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet Filter implementation class ProxyFilter
 */
public class ProxyFilter implements Filter {

    /**
     * Default constructor. 
     */
    public ProxyFilter() {
        // TODO Auto-generated constructor stub
    }

    /**
     * @see Filter#destroy()
     */
    public void destroy() {
        // TODO Auto-generated method stub
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        // delegate to the Http related doFilter method
        doFilter((HttpServletRequest)request, (HttpServletResponse)response, chain);        
    }

    public void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {
        // create a wrapper
        ProxyRequestWrapper replacementRequest = new ProxyRequestWrapper(request);

        // pass the request along the filter chain
        chain.doFilter(replacementRequest, response);
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        // TODO Auto-generated method stub

    }
}

ProxyRequestWrapper：

package testingThings.wrapperAndFilter;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class ProxyRequestWrapper extends HttpServletRequestWrapper {

    public ProxyRequestWrapper(HttpServletRequest request) {
        super(request);
    }

    @Override
    public String getRemoteAddr() {
        return getHeader("REAL-IP");
    }
}

<强>的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <filter>
    <filter-name>ProxyFilter</filter-name>
    <filter-class>testingThings.wrapperAndFilter.ProxyFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>ProxyFilter</filter-name>
    <url-pattern>/ServletBehindProxy</url-pattern>
  </filter-mapping>
</web-app>

<强> ServletBehindProxy：

package testingThings.wrapperAndFilter;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class ServletBehindProxy
 */
@WebServlet("/ServletBehindProxy")
public class ServletBehindProxy extends HttpServlet {
    private static final long serialVersionUID = 1L;

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // show ip
        resp.getWriter().append(req.getRemoteAddr());
    }

}

要测试它，您可以使用ModifyHeaders Browser-Plugin：

如何从服务器端更改HttpServletRequest中的IP？

1 个答案: