Question

我正在处理在数据库中记录api请求和响应的任务。我需要autowire spring bean来访问数据库，我们不能在过滤器内自动装配spring bean。

问题是我们只能在使用HttpServletResponseWrapper的过滤器中多次读取响应。

有没有办法在spring拦截器中多次读取响应？

以下是使用过滤器的代码。它可以检索所有信息，但不能在ApiActivityManager中自动装配bean以在数据库中插入数据。

如果我在Interceptor中读取一次响应，则控制器响应为空。

public class ApiActivityInterceptor implements Filter {
    ApiActivityManager apiActivityManager = new ApiActivityManager();

    @Override public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override 
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        MyRequestWrapper requestWrapper = new MyRequestWrapper((HttpServletRequest)request);
        MyResponseWrapper responseWrapper = new MyResponseWrapper((HttpServletResponse)response);
        InputStream inputStream = requestWrapper.getInputStream();
        StringBuilder stringBuilder = new StringBuilder();
        BufferedReader bufferedReader = null;
        if (inputStream != null) {
            bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            char[] charBuffer = new char[128];
            int bytesRead = -1;
            while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                stringBuilder.append(charBuffer, 0, bytesRead);
            }
        } else {
            stringBuilder.append("");
        }
        String requestText = stringBuilder.toString();
        log.info(requestText);

        chain.doFilter((ServletRequest)requestWrapper,(ServletResponse)responseWrapper);

        String responseText = new String(responseWrapper.getCopy(),responseWrapper.getCharacterEncoding());
        log.info(responseText);
        //for log details in database
        activityLogDetails.setActivityLog(requestText,responseText);
    }

    @Override public void destroy() {

    }
}

由于

Answer 1

要在过滤器类中自动装配spring bean，

首先在过滤器类中添加@Component注释。
将过滤器名称作为bean名称注册过滤器，过滤器类名称为org.springframework.web.filter.DelegatingFilterProxy

所以我的解决方案看起来像，

<强> ApiActivityFilter.java

@Component("apiActivityFilter")
public class ApiActivityFilter implements Filter {

    @Autowired
    ApiActivityManager apiActivityManager;

    @Override public void init(FilterConfig filterConfig) throws ServletException {
    }

    @Override 
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        MyRequestWrapper requestWrapper = new MyRequestWrapper((HttpServletRequest)request);
        MyResponseWrapper responseWrapper = new MyResponseWrapper((HttpServletResponse)response);
        InputStream inputStream = requestWrapper.getInputStream();
        StringBuilder stringBuilder = new StringBuilder();
        BufferedReader bufferedReader = null;
        if (inputStream != null) {
            bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
            char[] charBuffer = new char[128];
            int bytesRead = -1;
            while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
                stringBuilder.append(charBuffer, 0, bytesRead);
            }
        } else {
            stringBuilder.append("");
        }
        String requestText = stringBuilder.toString();
        log.info(requestText);

        chain.doFilter((ServletRequest)requestWrapper,(ServletResponse)responseWrapper);

        String responseText = new String(responseWrapper.getCopy(),responseWrapper.getCharacterEncoding());
        log.info(responseText);
        //for log details in database
        apiActivityManager.logApiActivity(activityLog);//activityLog Object to be logged
    }

    @Override public void destroy() {

    }
}

使用 Java配置

FilterRegistration.Dynamic apiActivityFilter = servletContext.addFilter("apiActivityFilter", DelegatingFilterProxy.class);
apiActivityFilter.addMappingForUrlPatterns(null, true, "/api/*");

使用 XML配置

<filter>
  <filter-name>apiActivityFilter</filter-name>
  <filter-class>org.springframework.web.filter.DelegatingFilterProxy</filter-class>
</filter>

<filter-mapping>
  <filter-name>apiActivityFilter</filter-name>
  <url-pattern>/api/*</url-pattern>
</filter-mapping>

如何在Spring拦截器中读取httpservletresponse？

1 个答案: