springboot解决跨域问题

在启动类里加入corsFilter

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Bean;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;


@SpringBootApplication
public class NuclearApplication {
    /**
     * 跨域过滤器
     *
     * @return
     */
    @Bean
    public CorsFilter corsFilter() {
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", buildConfig());
        return new CorsFilter(source);
    }

    private CorsConfiguration buildConfig() {
        CorsConfiguration corsConfiguration = new CorsConfiguration();
        corsConfiguration.addAllowedOrigin("*");
        corsConfiguration.addAllowedHeader("*");
        corsConfiguration.addAllowedMethod("*");
        return corsConfiguration;
    }


    public static void main(String[] args) {
        SpringApplication.run(NuclearApplication.class, args);
    }

}

特殊情况可以使用第二种来做，加入一个filter

import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Component
public class AccessFilter 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;
		HttpServletRequest request = (HttpServletRequest) servletRequest;
		response.setContentType("application/json; charset=utf-8");
		response.setCharacterEncoding("UTF-8");
		response.setHeader("Access-Control-Max-Age", "3600");
		response.setHeader("Access-Control-Allow-Methods", "POST, GET,PUT, OPTIONS, DELETE");
		response.setHeader("Access-Control-Allow-Origin", request.getHeader("Origin"));
		response.setHeader("Access-Control-Allow-Credentials", "true");
		response.setHeader("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept, token");
		filterChain.doFilter(servletRequest, servletResponse);
	}
	@Override
	public void destroy() {
	}
}