springboot+layui前后分离项目配置跨域问题的坑

记录一下springboot配置CrosVonfig处理跨域问题的坑，通常网上搜到的配置文件大概都是这个：

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

@Configuration
public class CrosConfig implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/*")
                .allowedOrigins("*")
                .allowCredentials(true)
                .allowedMethods("GET", "POST", "DELETE", "PUT","PATCH","OPTIONS")
                .allowedHeaders("Origin", "X-Requested-With", "Content-Type", "Accept", "Authorization")
                .maxAge(3600);

    }
}

大多数情况下也都没有问题，但是自己写东西的时候偏偏就出问题了！！！

如果后台请求是：

@RestController
public class TbLinkController {

    @Autowired
    TbLinkService tbLinkService;

    @GetMapping("index")
//    @RequestMapping("/index")
    public DataVO<TbLinkVO> getList(Integer page, Integer limit, HttpServletResponse response){
        response.setHeader("Access-Control-Allow-Origin","*");
        return  tbLinkService.getList(page,limit);
    }


}

前台请求地址

,url: 'http://localhost:8087/index'

访问正常但是如果后台请求是：

@RestController
@RequestMapping("/tblink/blog")
public class TbLinkController {

    @Autowired
    TbLinkService tbLinkService;

    @GetMapping("index")
//    @RequestMapping("/index")
    public DataVO<TbLinkVO> getList(Integer page, Integer limit, HttpServletResponse response){
        response.setHeader("Access-Control-Allow-Origin","*");
        return  tbLinkService.getList(page,limit);
    }


}

前台请求是：

,url: 'http://localhost:8087/tblink/blog/index'

就访问失败，如下图：

提示的就是存在跨域问题，解决办法如下，其实只是稍微修改一下CrosConfig配置类，将 .addMapping("/*") 改成 .addMapping("/**")就好了。


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

@Configuration
public class CrosConfig implements WebMvcConfigurer {

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**")
                .allowedOrigins("*")
                .allowCredentials(true)
                .allowedMethods("GET", "POST", "DELETE", "PUT","PATCH","OPTIONS")
                .allowedHeaders("Origin", "X-Requested-With", "Content-Type", "Accept", "Authorization")
                .maxAge(3600);

    }
}