让接口api接口 支持跨域

package com.java456.config;

import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

@Configuration
public class CORSConfiguration extends WebMvcConfigurationSupport {
	
	
	  /*
     * 这里主要为了解决跨域问题,所以重写addCorsMappings方法
     */
    @Override
    protected void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowedMethods("GET", "HEAD", "POST","PUT", "DELETE", "OPTIONS")
                .allowedHeaders("*")
                .exposedHeaders("access-control-allow-headers",
                        "access-control-allow-methods",
                        "access-control-allow-origin",
                        "access-control-max-age",
                        "X-Frame-Options")
                .allowCredentials(false).maxAge(3600);
        super.addCorsMappings(registry);
    }
    
    
	
}

二、java跨域的三种配置方式

• 方式一：配置过滤器（全局配置）

@Configurationpublic class GlobalCorsConfig {    
@Bean
    public CorsFilter corsFilter() {
        CorsConfiguration config = new CorsConfiguration();
          config.addAllowedOrigin("*");
          config.setAllowCredentials(true);
          config.addAllowedMethod("*");
          config.addAllowedHeader("*");
          config.addExposedHeader("*");

        UrlBasedCorsConfigurationSource configSource = new UrlBasedCorsConfigurationSource();
        configSource.registerCorsConfiguration("/**", config);        return new CorsFilter(configSource);
    }
}

• 方式二：配置拦截器 （全局配置）

@Configurationpublic class MyConfiguration extends WebMvcConfigurerAdapter  {    
@Override  
    public void addCorsMappings(CorsRegistry registry) {  
        registry.addMapping("/**")  
                .allowCredentials(true)  
                .allowedHeaders("*")  
                .allowedOrigins("*")  
                .allowedMethods("*");  

    }  
}

• 方式三： 单个请求的跨域通过 @CrossOrigin 注解来实现

@RequestMapping("/hello")@CrossOrigin("http://localhost:8080") public String hello( ){	return "Hello World";
}

参考资料：https://blog.csdn.net/fxbin123/article/details/80603678