jsp防止跨域提交数据的具体实现


            复制代码 代码如下: //ArgsIsValidFilter .java过滤器代码清单： package com.hety.uitl; import java.io.IOException; import java.util.Enumeration; 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; import org.apache.commons.logging.Log; import org.apache.commons.logging.LogFactory; public class ArgsIsValidFilter implements Filter { private static Log log = LogFactory.getLog(ArgsIsValidFilter.class); public void destroy() { } @SuppressWarnings("unchecked") public void doFilter(ServletRequest arg0, ServletResponse arg1, FilterChain arg2) throws IOException, ServletException { HttpServletRequest request = (HttpServletRequest) arg0; HttpServletResponse response = (HttpServletResponse) arg1; String servername_str = request.getServerName(); String currentURI = request.getRequestURI(); Enumeration headerValues = request.getHeaders("Referer"); String tmpHeaderValue = ""; boolean isValid = true; //指定需要跳过拦截的页面地址，如果需要新增，可直接在数组中添加。 //“建议” String [] ignoreURIS={"/back/", "/Info.jsp", "/pzxx.jsp" }; while (headerValues.hasMoreElements()) { // 得到完整的路径：如“http://www.domain.com.cn:8023/front/zwgk/zwgk.jsp?id=1283” tmpHeaderValue = (String) headerValues.nextElement(); } if(log.isInfoEnabled()){ log.info(" 获得的参数url为: " + tmpHeaderValue ); log.info(" 系统取得的url为："+ currentURI); } if ("".equals(tmpHeaderValue)) { isValid = false; if(log.isInfoEnabled()){ log.info(" 获得的参数url为: empty"); log.info(" 系统取得的url为："+ currentURI); log.info("系统提示：请求可能来自外域！"); } } else { if(log.isInfoEnabled()){ log.info("获得的参数长度为:"+tmpHeaderValue.length()); } tmpHeaderValue = tmpHeaderValue.toLowerCase(); servername_str = servername_str.toLowerCase(); int len = 0; if (tmpHeaderValue.startsWith("http://")) { len = 8; } else if (tmpHeaderValue.startsWith("http://")) { len = 7; } if(log.isInfoEnabled()){ log.info("截取前的字符串为：" + tmpHeaderValue ); log.info( "从第 " + len + " 位开始截取，截取长度为：" + servername_str.length()); } String tmp = tmpHeaderValue.substring(len, servername_str.length() + len); if(log.isInfoEnabled()){ log.info("截取后的字符串为：" + tmp); } if (tmp.length() < servername_str.length()) { // 长度不够 isValid = false; if(log.isInfoEnabled()){ log.info("截取后的字符串长度不够,请求可能来自外域！"); } } else if (!tmp.equals(servername_str)) {// 比较字符串（主机名称）是否相同 isValid = false; if(log.isInfoEnabled()){ log.info("域名匹配失败，请求来自外域！"); } } } // 跳过指定需要拦截的页面地址 for (String ignoreURI : ignoreURIS) { if(currentURI.contains(ignoreURI)){ isValid=true; if(log.isInfoEnabled()){ log.info("系统已跳过检查以下url："+currentURI); } } } if (!isValid) { if(log.isInfoEnabled()){ log.info("系统提示信息：URL为跨域请求，即将重定向到首页。 "); } response.sendRedirect("/index.html"); } else { arg2.doFilter(arg0, arg1); } } public void init(FilterConfig arg0) throws ServletException { } }