Java background cross-domain problem solution

After the actual development is successful, we will definitely encounter cross-domain problems, and once again record how to solve cross-domain problems in java code

Add a filter in the server code

package com.thinkgem.jeesite.common.filter;

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 HeaderFilter implements Filter
{
    
    
    public void doFilter(ServletRequest request, ServletResponse resp, FilterChain chain) throws IOException, ServletException
    {
    
    
        HttpServletResponse response = (HttpServletResponse) resp; response.setHeader("Access-Control-Allow-Origin", "*"); //解决跨域访问报错
        response.setHeader("Access-Control-Allow-Methods", "POST, PUT, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600"); //设置过期时间
        response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, client_id, uuid, Authorization");
        response.setHeader("Cache-Control", "no-cache, no-store, must-revalidate"); // 支持HTTP 1.1.
        response.setHeader("Pragma", "no-cache"); // 支持HTTP 1.0. response.setHeader("Expires", "0");
        chain.doFilter(request, resp);
    }
    public void init(FilterConfig filterConfig) {
    
    }
    public void destroy() {
    
    }
}

Configure in web.xml

	<filter>
		<filter-name>HeaderFilter</filter-name>
		<filter-class>com.thinkgem.jeesite.common.filter.HeaderFilter</filter-class><!--你过滤器的包 -->
	</filter>
	<filter-mapping>
		<filter-name>HeaderFilter</filter-name>
		<url-pattern>/*</url-pattern><!-- 你开放的接口前缀  -->
	</filter-mapping>

After it’s matched, it’s ok to visit normally