SpringBoot解决跨域问题

SpringBoot启动类

import com.example.filter.CrosFilter;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.context.annotation.Bean;
 
@SpringBootApplication
public class exampleApplication {
 
    public static void main(String[] args) {
        SpringApplication.run(exampleApplication.class, args);
    }
 
    /**
     * 配置跨域访问的过滤器
     * @return
     */
    @Bean
    public FilterRegistrationBean registerFilter(){
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.addUrlPatterns("/*");
        bean.setFilter(new CrosFilter());
        return bean;
    }
}

过滤器

import javax.servlet.*;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
 
public class CrosFilter implements javax.servlet.Filter {
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
 
    }
 
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletResponse res = (HttpServletResponse) servletResponse;
        //*号表示对所有请求都允许跨域访问
        res.addHeader("Access-Control-Allow-Origin", "*");
        res.addHeader("Access-Control-Allow-Methods", "*");
        filterChain.doFilter(servletRequest, servletResponse);
    }
 
    @Override
    public void destroy() {
 
    }
}