解决跨域问题
解决跨域问题
跨域问题的产生
- 访问协议不一致
- 访问地址(ip)不一致
- 端口号不一致
解决方案
- 接口类加@CrossOrigin注解允许跨域
@CrossOrigin并不是万能的,有时候遇到加了还会遇到跨域问题,eg:
has been blocked by CORS policy: Request [header](https://so.csdn.net/so/search?q=header&spm=1001.2101.3001.7020) field token is not allowed by Access-Control-Allow-Headers in preflight response.
可以自定义过滤器解决:
package com.yl.common.common.util.filter;
import org.springframework.stereotype.Component;
import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
/**
* 跨域问题过滤器
*
* @author Y-wee
*/
@Component
public class SimpleCORSFilter implements Filter {
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
HttpServletResponse res = (HttpServletResponse) response;
res.setHeader("Access-Control-Allow-Origin", "*");
res.setHeader("Access-Control-Allow-Credentials", "true");
res.setHeader("Access-Control-Allow-Headers", "token");
chain.doFilter(request, response);
}
@Override
public void init(FilterConfig filterConfig) {
}
@Override
public void destroy() {
}
}
参考文档:
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