java防止跨域提交数据的具体如何实现

 
//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("https://")) { 
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 { } } 

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