java解决跨域问题

1.编写Filter类

package com.skynet.oilmap.system;

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.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SimpleCORSFilter implements Filter{
    
    public final static Logger LOGGER = LoggerFactory.getLogger(SimpleCORSFilter.class);
    
    private boolean isCross = false;

    @Override
    public void destroy() {
        isCross = false;
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) {
        try {
            if (isCross) {
                HttpServletRequest httpServletRequest = (HttpServletRequest) request;
                HttpServletResponse httpServletResponse = (HttpServletResponse) response;
                LOGGER.debug("跨域拦截请求: " + httpServletRequest.getServletPath());
                httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");
                httpServletResponse.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
                httpServletResponse.setHeader("Access-Control-Max-Age", "0");
                httpServletResponse.setHeader("Access-Control-Allow-Headers", "Origin, No-Cache, X-Requested-With, If-Modified-Since, Pragma, Last-Modified, Cache-Control, Expires, Content-Type, X-E4M-With,userId,token");
                httpServletResponse.setHeader("Access-Control-Allow-Credentials", "true");
                httpServletResponse.setHeader("XDomainRequestAllowed", "1");
            }
            chain.doFilter(request, response);
        }catch (Exception e) {
            LOGGER.debug("拦截请求，判断是否跨域异常", e);
        }
        
    }

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        String isCrossStr = filterConfig.getInitParameter("IsCross");
        isCross = isCrossStr.equals("true") ? true : false;
    }

}
 

2.在web.xml中配置该Filter

    <!-- 跨域请求 -->
    <filter>
        <filter-name>SimpleCORSFilter</filter-name>
        <filter-class>com.skynet.oilmap.system.SimpleCORSFilter</filter-class>
        <init-param>
            <param-name>IsCross</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>SimpleCORSFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

 

配置结束即可解决跨域问题。