前后端项目的跨域问题解决

@WebFilter(filterName = "kuaYuFilter", urlPatterns = "/*")

public class kuayuFilter implements Filter {

@Override

public void init(FilterConfig filterConfig) throws ServletException {

}

@Override

public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)

throws IOException, ServletException {

HttpServletResponse response = (HttpServletResponse) servletResponse;

HttpServletRequest request = (HttpServletRequest) servletRequest;

// 不使⽤*，⾃动适配跨域域名，避免携带Cookie时失效

String origin = ("Origin");

("Access-Control-Allow-Origin", origin);

// ⾃适应所有⾃定义头

String headers = ("Access-Control-Request-Headers");

("Access-Control-Allow-Headers", headers);

("Access-Control-Expose-Headers", headers);

// 允许跨域的请求⽅法类型

("Access-Control-Allow-Methods", "*");

// 预检命令（OPTIONS）缓存时间，单位：秒

("Access-Control-Max-Age", "3600");

// 明确许可客户端发送Cookie，不允许删除字段即可

("Access-Control-Allow-Credentials", "true");

(request, response);

}

@Override

public void destroy() {

}

}