SpringBoot通过拦截器 解决跨域请求问题

 

import java.util.List;

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

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

/**
 * 请求拦截器，处理跨域问题
 *
 */
@Component
public class CommonInterceptor implements HandlerInterceptor {
 
    private List<String> excludedUrls;
 
    public List<String> getExcludedUrls() {
        return excludedUrls;
    }
 
    public void setExcludedUrls(List<String> excludedUrls) {
        this.excludedUrls = excludedUrls;
    }
 
    /**
     * 
     * 在业务处理器处理请求之前被调用 如果返回false 
     * 从当前的拦截器往回执行所有拦截器的afterCompletion(),
     * 再退出拦截器链, 如果返回true 执行下一个拦截器,
     * 直到所有的拦截器都执行完毕 再执行被拦截的Controller
     * 然后进入拦截器链,
     * 从最后一个拦截器往回执行所有的postHandle()
     * 接着再从最后一个拦截器往回执行所有的afterCompletion()
     * 
     * @param  request
     * 
     * @param  response
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response,
            Object handler) throws Exception {
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "*");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers",
                "Origin, X-Requested-With, Content-Type, Accept");
        return true;
    }
 
    // 在业务处理器处理请求执行完成后,生成视图之前执行的动作
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
            ModelAndView modelAndView) throws Exception {
 
    }
 
    /**
     * 
     * 在DispatcherServlet完全处理完请求后被调用
     * 当有拦截器抛出异常时,
     * 会从当前拦截器往回执行所有的拦截器的afterCompletion()
     * 
     * @param request
     * 
     * @param response
     * 
     * @param handler
     * 
     */
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response,
            Object handler, Exception ex) throws Exception {
 
    }
    }

下面是第二个类主要作用是找到上面配置的拦截器

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringBootConfiguration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
/**
 * 找到配置的拦截器 配置东西等
 * @author ASUS-
 *
 */
@SpringBootConfiguration
public class MySpringMVCConfig extends WebMvcConfigurerAdapter {

    @Autowired
    private CommonInterceptor commonInterceptor;

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // TODO Auto-generated method stub
        registry.addInterceptor(commonInterceptor).addPathPatterns("/**");
        // super.addInterceptors(registry);
        // registry.addInterceptor(commonInterceptor).addPathPatterns("/**").excludePathPatterns("/login",
        // "/register");

    }
    /*
     * @Override public void addInterceptors(InterceptorRegistry registry){
     * registry.addInterceptor(userConfig).add }
     */
}

到这里springboot解决跨域请求的拦截器就配置好了