Post request is No 'Access-Control-Allow-Origin' header is present on the requested resource跨域问题解决

绝地灬酷狼 2022-05-22 02:27 144阅读 0赞

# 跨域问题 #

**报错信息为**：post request is No ‘Access-Control-Allow-Origin’ header is present on the requested resource.

**原因**：例如我们需要在A网址获取B网的资源，由于A，B不在同一个域名之中导致出现了跨域访问资源的情况。在浏览器的协议中，默认这样的访问是不安全的。跨域访问被认为违反了同源策略，它规定只能访问跟他html同源的资源  
跨域限制是浏览器行为，不是服务器行为。 浏览器认为地址栏输入时安全的,所以不限制认为是跨域。

**如何解决跨域问题**：在后台添加过滤器，在需要跨域的请求体头部添加Header属性

## 首先新建过滤器的类 ##

package com.jfly.apps.restful.springmvc;
    
    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 CORSInterceptor 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;
            String origin = (String) servletRequest.getRemoteHost() + ":" + servletRequest.getRemotePort();
            response.setHeader("Access-Control-Allow-Origin", "*");
            response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
            response.setHeader("Access-Control-Max-Age", "3600");
            response.setHeader("Access-Control-Allow-Headers", "x-requested-with,Authorization,Content-Type");
            response.setHeader("Access-Control-Allow-Credentials", "true");
            filterChain.doFilter(servletRequest, servletResponse);
    
        }
    
        @Override
        public void destroy() {
        }
    }

## 其次在web.xml中配置过滤器，完成 ##

<filter>
        <filter-name>CORSInterceptor</filter-name>
        <filter-class>com.jfly.apps.restful.springmvc.CORSInterceptor</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>CORSInterceptor</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

Post request is No 'Access-Control-Allow-Origin' header is present on the requested resource跨域问题解决

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