springMVC解决跨域请求
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2022-07-08 14:39:49
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1、创建Java类
package com.util;
import java.io.IOException;
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.springframework.web.filter.OncePerRequestFilter;
public class CrossFilter extends OncePerRequestFilter {
@Override
protected void doFilterInternal(HttpServletRequest request,
HttpServletResponse response, FilterChain filterChain)
throws ServletException, IOException {
// if (request.getHeader("Access-Control-Request-Method") != null &&
// "OPTIONS".equals(request.getMethod())) {
// CORS "pre-flight" request
response.addHeader("Access-Control-Allow-Origin", "*");
response.addHeader("Access-Control-Allow-Methods",
"GET, POST, PUT, DELETE");
response.addHeader("Access-Control-Allow-Headers", "Content-Type");
response.addHeader("Access-Control-Max-Age", "1800");// 30 min
// }
filterChain.doFilter(request, response);
}
}
1、配置web.xml
<filter>
<filter-name>cors</filter-name>
<filter-class>com.util.CrossFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>cors</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
此时,option请求被CrossFilter过滤器接入并赋予跨域响应头,同时也进入FrameworkServlet中的doOption方法。查看浏览器控制台,发现option请求返回支持跨域信息,后续的post请求进入controller。
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