java处理跨域问题

具体的看代码！ 

package com.yt.live.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.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.context.annotation.Configuration;
import org.springframework.core.annotation.Order;

/**
 * 处理跨域
 * @author tyg
 * @date   2019年9月7日下午3:10:22
 */
@WebFilter(filterName = "CORSFilter", urlPatterns = { "/*" })
@Order(value = 1)
@Configuration
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 {
		System.out.println("Filter 过滤器 执行 了");
		HttpServletRequest request = (HttpServletRequest) servletRequest;
		HttpServletResponse response = (HttpServletResponse) servletResponse;

		// 响应标头指定 指定可以访问资源的URI路径
		response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));

		// 响应标头指定响应访问所述资源到时允许的一种或多种方法
		response.setHeader("Access-Control-Allow-Methods", "POST, GET, PUT, OPTIONS, DELETE");

		// 设置 缓存可以生存的最大秒数
		response.setHeader("Access-Control-Max-Age", "3600");

		// 设置 受支持请求标头
		response.setHeader("Access-Control-Allow-Headers", "userId,token,tokentype,number");

		// 指示的请求的响应是否可以暴露于该页面。当true值返回时它可以被暴露
		response.setHeader("Access-Control-Allow-Credentials", "true");

		filterChain.doFilter(servletRequest, servletResponse);

	}

	@Override
	public void destroy() {

	}
}

在web.xml中加入filter

	crossFilter
	com.yt.live.filter.CorsFilter


	crossFilter
	/*