Java后端解决跨域问题
目录
Java后端解决跨域问题
在前后端分离情况下，前端端口与后端端口不一致时，请求数据是会被浏览器阻止的，即必须保持同源机制，源指：协议·主机·端口都要保持一致。但是我们在项目中经常需要在不同端口中进行不同的数据请求，常常需要经历跨域。解决跨域问题可以在前端或后端，这里我们以后端为例子：
编写一个跨域的工具类：
主要用到了Corsilter
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@Configuration
public class CorConfig {
private static final long MAX_AGE = 24*60*60;
@Bean
public CorsFilter corsFilter(){
UrlBasedCorsConfigurationSource urlBasedCorsConfigurationSource = new UrlBasedCorsConfigurationSource();
CorsConfiguration corsConfiguration = new CorsConfiguration();
corsConfiguration.addAllowedOrigin("*");
corsConfiguration.addAllowedHeader("*");
corsConfiguration.addAllowedMethod("*");
corsConfiguration.setMaxAge(MAX_AGE);
urlBasedCorsConfigurationSource.registerCorsConfiguration("/**",corsConfiguration);
return new CorsFilter(urlBasedCorsConfigurationSource);
}
}