java - spring boot - 从过滤器返回 pojo 响应

Question

我想创建一个具有 Autowiring 构造函数参数的过滤器/bean，并且对于对某些 url 的每个请求检查 header 并返回 pojo 错误(或者理想情况下抛出将由 spring 处理的异常)，或者通过过滤器链。类似的东西

@Bean
class MyFilter {

  @Autowired
  public MyFilter(MyService myService) {...}

  public doFilter(request, response, chain) {
     if (request. ...) {
        throw new ResponseStatusException(HttpStatus.BAD_REQUEST)
        // or return new MyErrorPojo()
     }
     return chain.doFilter(request, response)
  }
}

Spring 的做法是什么？

Answer 1

也许这会对你有所帮助。

import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

@Component
@Order( 1 )
public class RequestFilter implements Filter
{

    @Override
    public void doFilter(
            ServletRequest request,
            ServletResponse response,
            FilterChain chain ) throws IOException, ServletException

    {

        HttpServletRequest req = ( HttpServletRequest ) request;
        if( false )
        {
            response.getWriter().println( "error" );
            throw new ServletException( "" );
        }
        else
        {
            doFilter( request, response, chain );
        }

    }
}