Java后台解决前端调用跨域问题

一、创建WebFilter类

public class WebFilter 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() {}

}

二、web.xml设置过滤器

<filter>
<filter-name>WebFilter</filter-name>
<filter-class>com.web.WebFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>WebFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>