java web CORS實現跨域請求

以前用jsonp 解決跨域問題，如今用 CORS實現跨域請求 解決java 跨域問題：

主要代碼以下

package com.hy.fliter;

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;

import org.apache.commons.httpclient.HttpStatus;

/**
 * Created by qpx on 2016/7/30.
 */
public class CorsFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException { }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        HttpServletRequest request = (HttpServletRequest) servletRequest;

        // 指定容許其餘域名訪問
        response.setHeader("Access-Control-Allow-Origin", "*");
        // 響應類型
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, DELETE, OPTIONS, DELETE");
        // 響應頭設置
        response.setHeader("Access-Control-Allow-Headers", "Content-Type, x-requested-with, X-Custom-Header, HaiYi-Access-Token");

        if ("OPTIONS".equals(request.getMethod())){
            response.setStatus(HttpStatus.SC_NO_CONTENT);
        }

        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() { }
}

web.xml 代碼以下配置

<filter>
  <filter-name>cors</filter-name>
  <filter-class>com.hy.fliter.CorsFilter</filter-class>
</filter>

<filter-mapping>
  <filter-name>cors</filter-name>
  <url-pattern>/*</url-pattern>
</filter-mapping>