拦截器解决跨域问题

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解决跨域问题的方法挺多的。该方法只是本人用过，做个记录。

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;

/**
 * 拦截器，允许跨域
 * @author zhang
 * @date 2018年10月10日,下午2:05:39
 */
@Component
public class CrosInterceptor implements HandlerInterceptor{
	
	@Override  
    public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception {  
  
        httpServletResponse.setHeader("Access-Control-Allow-Origin", "*");  
  
        httpServletResponse.setHeader("Access-Control-Allow-Headers", "Content-Type,Content-Length, Authorization, Accept,X-Requested-With");  
  
        httpServletResponse.setHeader("Access-Control-Allow-Methods","PUT,POST,GET,DELETE,OPTIONS");  
  
        String method= httpServletRequest.getMethod();  
  
        if (method.equals("OPTIONS")){  
            httpServletResponse.setStatus(200);  
            return false;  
        }  
    
        return true;  
    }  

}

import javax.annotation.Resource;

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

/**
 * 配置拦截器
 * @author zhang
 * @date 2018年10月10日,下午2:09:52
 */
@Configuration
public class WebConfig implements WebMvcConfigurer {
	
	@Resource
	private CrosInterceptor cros;
	
	/* (non-Javadoc)
	 * @see org.springframework.web.servlet.config.annotation.WebMvcConfigurer#addInterceptors(org.springframework.web.servlet.config.annotation.InterceptorRegistry)
	 */
	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		registry.addInterceptor(cros).addPathPatterns("/**");
		WebMvcConfigurer.super.addInterceptors(registry);
	}
    
}