Web跨域请求及SpringBoot项目解决方案

SpringBoot项目解决方案

方法一、SpringBoot的注解@CrossOrigin（也支持SpringMVC）

@RestController
@CrossOrigin
@RequestMapping("/product")
public class ProductController extends BaseController{

    @Autowired
    private ProductService productService;
 
}

方法二、将注解@CrossOrigin放在BaseController公共类上

@CrossOrigin
public class BaseController {
    
}

方法三、处理跨域请求的Configuration
增加一个配置类，WebConfig.java。继承WebMvcConfigurerAdapter或者实现WebMvcConfigurer接口，其他都不用管，项目启动时，会自动读取配置。

@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
    static final String ORIGINS[] = new String[] { "GET", "POST", "PUT", "DELETE" };
    @Override
    public void addCorsMappings(CorsRegistry registry) {
        registry.addMapping("/**").allowedOrigins("*").allowCredentials(true).allowedMethods(ORIGINS).maxAge(3600);
    }

方法四、采用过滤器（filter）的方式
同方法二加配置类，增加一个CORSFilter 类，并实现Filter接口即可，其他都不用管，接口调用时，会过滤跨域的拦截

@Component
public class CORSFilter implements Filter {

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        HttpServletResponse res = (HttpServletResponse) response;
        // 设置允许Cookie
        res.addHeader("Access-Control-Allow-Credentials", "true");
        // 允许http://www.xxx.com域（自行设置，这里只做示例）发起跨域请求
        res.addHeader("Access-Control-Allow-Origin", "*");
        // 设置允许跨域请求的方法
        res.addHeader("Access-Control-Allow-Methods", "GET, POST, DELETE, PUT");
        // 允许跨域请求包含content-type
        res.addHeader("Access-Control-Allow-Headers", "Content-Type,X-CAF-Authorization-Token,sessionToken,X-TOKEN");
        if (((HttpServletRequest) request).getMethod().equals("OPTIONS")) {
            response.getWriter().println("ok");
            return;
        }
        chain.doFilter(request, response);
    }
    
    @Override
    public void destroy() {
    }
    
    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
    }
}

方法五：CORSFilter解决前端跨域请求问题，效果最好

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.reactive.CorsWebFilter;
import org.springframework.web.cors.reactive.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

/**
 * author: lovoo
 * Date:2019/12/12
 * Time:11:01
 */
@Configuration
public class GlobalCorsConfig {
 
    @Bean
    public CorsWebFilter corsFilter() {
        //1.添加CORS配置信息
        CorsConfiguration config = new CorsConfiguration();
        config.addAllowedOrigin("*");
        config.addAllowedMethod("*");
        config.addAllowedHeader("*");
        //2.是否发送Cookie信息
        config.setAllowCredentials(true);
        //3.有效时间
        config.setMaxAge(3600L);
        //2.添加映射路径，我们拦截一切请求
        UrlBasedCorsConfigurationSource configSource = new UrlBasedCorsConfigurationSource();
        configSource.registerCorsConfiguration("/**", config);
        //4.返回新的CorsFilter.
        return new CorsWebFilter(configSource);
    }
}

方法六、使用nginx

将前端项目与后台项目网关配置在nginx中

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