Application.java

package cn.timer.api;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.http.HttpMessageConverters;
import org.springframework.boot.web.client.RestTemplateBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

import cn.hutool.core.net.NetUtil;

@MapperScan({"cn.timer.api.dao"}) // 扫描的mapper
@ComponentScan(basePackages = {"cn.timer.api"})
@SpringBootApplication
@EnableScheduling
@EnableTransactionManagement
public class Application {

	public static void main(String[] args) {
		final Integer port = 8089;
		if (!NetUtil.isUsableLocalPort(port)) {
			System.err.printf("端口%d被占用了，无法启动%n", port);
			System.exit(1);
		}
		SpringApplication.run(Application.class, args);
	}

	@Autowired
	private RestTemplateBuilder restTemplateBuilder;

	@Bean
	public RestTemplate getRestTemplate() {
		return restTemplateBuilder.build();
	}
	
	private CorsConfiguration buildConfig() {  
        CorsConfiguration corsConfiguration = new CorsConfiguration();  
        corsConfiguration.addAllowedOrigin("*"); // 1允许任何域名使用
        corsConfiguration.addAllowedHeader("*"); // 2允许任何头
        corsConfiguration.addAllowedMethod("*"); // 3允许任何方法（post、get等）
        corsConfiguration.setAllowCredentials(true);
        return corsConfiguration;  
    }  
  
    @Bean  
    public CorsFilter corsFilter() {  
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();  
        source.registerCorsConfiguration("/**", buildConfig()); // 4  
        return new CorsFilter(source);  
    } 

	// @Override
	// protected SpringApplicationBuilder configure(SpringApplicationBuilder
	// builder) {
	// return builder.sources(Application.class);
	// }
}