前后端分离开发解决前端静态资源跨域请求问题

比眉伴天荒 2022-05-28 20:49 191阅读 0赞

前端静态资源发起请求时首先会发送一个域请求，后端通过后再次发起get、post请求

使用过滤器对域请求授权，这里授权了一个特殊的token请求字段，可以根据自己的业务添加请求字段。

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;
    
    /**
     * Servlet Filter implementation class HttpFilter
     */
    public class HttpFilter implements Filter {
    
        /**
         * Default constructor. 
         */
        public HttpFilter() {
            // TODO Auto-generated constructor stub
        }
    
    	/**
    	 * @see Filter#destroy()
    	 */
    	public void destroy() {
    		// TODO Auto-generated method stub
    	}
    
    	/**
    	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
    	 */
    	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
    		HttpServletResponse resp=(HttpServletResponse)response;
    		HttpServletRequest rep = (HttpServletRequest) request;
    		resp.setHeader("Access-Control-Allow-Origin", rep.getHeader("Origin"));
    		resp.setHeader("Access-Control-Allow-Methods", "POST, GET,PUT, OPTIONS, DELETE,PUT");
    		resp.setHeader("Access-Control-Allow-Headers", "x-requested-with,Authorizationaccept, origin, content-type, token");
    		//允许跨域请求中携带cookie
    		resp.setHeader("Access-Control-Allow-Credentials","true");
    		chain.doFilter(request, response);
    	}
    
    	/**
    	 * @see Filter#init(FilterConfig)
    	 */
    	public void init(FilterConfig fConfig) throws ServletException {
    		// TODO Auto-generated method stub
    	}
    
    }