SpringBoot解決跨域問題

方法一： 創建一個filter解決跨域，此方法也支持springmvc。

@Component
public class SimpleCORSFilter implements Filter {

    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) res;
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE, HEAD");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers", "access-control-allow-origin, authority, content-type, version-info, X-Requested-With");
        chain.doFilter(req, res);
    }

    public void init(FilterConfig filterConfig) {}

    public void destroy() {}
}　

方法二：基於繼承WebMvcConfigurerAdapter或者實現WebMvcConfigurer接口配置加入Cors的跨域，此方法常用於springboot。

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

@Configuration 
public class CorsConfig extends WebMvcConfigurerAdapter { 
    @Override 
    public void addCorsMappings(CorsRegistry registry) { 
        registry.addMapping("/**") 
                .allowedOrigins("*") 
                .allowCredentials(true) 
                .allowedMethods("GET", "POST", "DELETE", "PUT") 
                .maxAge(3600); 
    } 
}

import com.common.constant.TokenConstants;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.CorsRegistry;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Override
    public void addCorsMappings(CorsRegistry registry) {
                // 設置允許跨域的路由
        registry.addMapping("/**")
                // 設置允許跨域請求的域名
                .allowedOriginPatterns("*")
                // 是否允許證書（cookies）
                .allowCredentials(true)
                // 設置允許的方法
                .allowedMethods("*")
                // 跨域允許時間
                .maxAge(3600);
    }
}　

方法三：設置特別控制層允許跨域

@CrossOrigin(origins = "http://192.168.1.10:8080", maxAge = 3600)
@RequestMapping("/index")
@RestController
public class IndexController{
}

@CrossOrigin這個注解在controller類中使用，就可以指定該controller中所有方法都能處理來自http:19.168.1.10:8080中的請求。