解決cors跨域的問題

1.過濾器代碼如下：

package com.mvc.imp;

import java.io.IOException;
import java.util.Arrays;
import java.util.List;
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;

/**
 * 跨域過濾器
 * @author suyunlong
 *
 */
public class CorsFilter implements Filter
{
	private String allowOrigin;
	private String allowMethods;
	private String allowCredentials;
	private String allowHeaders;
	private String exposeHeaders;
	public void init(FilterConfig filterConfig) throws ServletException
	{
		allowOrigin=filterConfig.getInitParameter("allowOrigin");
		allowMethods=filterConfig.getInitParameter("allowMethods");
		allowCredentials=filterConfig.getInitParameter("allowCredentials");
		allowHeaders=filterConfig.getInitParameter("allowHeaders");
		exposeHeaders=filterConfig.getInitParameter("exposeHeaders");
	}
	public void doFilter(ServletRequest req,ServletResponse res,FilterChain chain) 
			throws IOException,ServletException
	{
		HttpServletRequest request=(HttpServletRequest)req;
		HttpServletResponse response=(HttpServletResponse)res;
		if(!allowOrigin.equals(""))
        {
			List<String> allowOriginList=Arrays.asList(allowOrigin.split(","));
			if(allowOriginList!=null)
			{
				String currentOrigin=request.getHeader("Origin");
				if(allowOriginList.contains(currentOrigin))
				{
					response.setHeader("Access-Control-Allow-Origin",currentOrigin);
				}  
            }
        }
		if(!allowMethods.equals(""))
		{
			response.setHeader("Access-Control-Allow-Methods",allowMethods);
		}  
        if(!allowCredentials.equals(""))
        {
        	response.setHeader("Access-Control-Allow-Credentials",allowCredentials);
        }
        if(!allowHeaders.equals(""))
        {
        	response.setHeader("Access-Control-Allow-Headers",allowHeaders);
        }
        if(!exposeHeaders.equals(""))
        {
        	response.setHeader("Access-Control-Expose-Headers",exposeHeaders);
        }
        chain.doFilter(req,res);
	}
	public void destroy()
	{
		
    }
}

2.web.xml配置如下：

<filter>
    <filter-name>corsFilter</filter-name>  
    <filter-class>com.mvc.imp.CorsFilter</filter-class>  
    <init-param>
    	<param-name>allowOrigin</param-name>  
        <param-value>http://localhost:8080,http://127.0.0.1:8080</param-value>  
    </init-param>  
    <init-param>  
        <param-name>allowMethods</param-name>  
        <param-value>GET,POST,PUT,DELETE,OPTIONS</param-value>  
    </init-param>  
    <init-param>  
        <param-name>allowCredentials</param-name>  
        <param-value>true</param-value>  
    </init-param>  
    <init-param>  
        <param-name>allowHeaders</param-name>  
        <param-value>Content-Type</param-value>  
    </init-param>
    <init-param>  
        <param-name>exposeHeaders</param-name>  
        <param-value>Content-Type</param-value>  
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>corsFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>