java解决跨域问题

Step1 添加SimpleCORSFilter过滤器类

package tools;

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.HttpServletResponse;

public class SimpleCORSFilter implements Filter {

    @Override

    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {

        HttpServletResponse res = (HttpServletResponse)response;

        res.setHeader("Access-Control-Allow-Origin", "*");

        res.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");

        res.setHeader("Access-Control-Max-Age", "3600");

        res.setHeader("Access-Control-Allow-Headers", "x-requested-with");

        chain.doFilter(request, response);

    }

    @Override

    public void destroy() {

    }

}

Step2 在web.xml中配置过滤器

<filter>

        <filter-name>cors</filter-name>

        <filter-class>tools.SimpleCORSFilter</filter-class>

    </filter>

    <filter-mapping>

        <filter-name>cors</filter-name>

        <url-pattern>/*</url-pattern>

    </filter-mapping>