java后台解决跨域问题
解决跨域问题的方式有很多，这里主要是添加注解的方式和采用添加拦截器的方法：
方法一、spring boot中只用在Controller类上添加一个“@CrossOrigin“注解就可以实现对当前controller 的跨域 访问了，当然这个标签也可以加到方法上。
@CrossOrigin
public class CommonController {
}
其他controller类继承以上这个类就可以解决跨域问题。
注意：“@CrossOrigin“注解要求jdk1.8以上版本
方法二、采用添加拦截器的方法
@Configuration
public class WebConfig extends WebMvcConfigurerAdapter {
@Autowired
private EnvConfig envConfig;
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new HandlerInterceptor() {
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
boolean isTrue = envConfig.getIsDev();//判断是测试服才需要解决跨域问题
if (isTrue) {
response.addHeader("Access-Control-Allow-Origin", "*");
response.addHeader("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
response.addHeader("Access-Control-Allow-Headers",
"Content-Type,X-Requested-With,accept,Origin,Access-Control-Request-Method,Access-Control-Request-Headers,token");
}
return true;
}
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler,
Exception ex) throws Exception {
}
});
}
}