HttpServletRequest 获取参数、header、body

Java

本文的初衷是java后端崩溃后，如何把入参传给 Sentry，从而更快速的定位和解决问题。入参包括：query string、form-data、body，还有 url、headers，当然考虑到分布式部署，还应该拿到当前的服务器 ip 以及端口，至于用户信息，header 里面一般包含了。先上张效果图：

如果看不清，请点击图片查看原图，谢谢。这张图里面有body，headers，localAddr、localPort、method、params、remoteHost、url等，可以说足够我们定位那个接口错了（url），用户的入参（params是query string + form data的集合，body 是 post 请求的请求体），当时的服务器 localAddr 以及运行端口 localPort，另外还有 headers， headers 一般会包含用户的信息，比如 token，如果使用了网关，那么 headers 可能包含更多信息，比如用户 id、用户手机号、等等，具体跟网关有关啦。remoteHost 可能用不着，headers 里面包含了足够多的信息了。好了，具体相关的异常上报类如下：

import io.sentry.Sentry;
import io.sentry.event.Event;
import io.sentry.event.EventBuilder;
import io.sentry.event.User;
import io.sentry.event.interfaces.ExceptionInterface;
import tv.drplay.util.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.stream.Collectors;

public class Crash {

    public static void onCrash(Exception e, HttpServletRequest request) {
        String url = request.getRequestURI();
        EventBuilder eventBuilder = new EventBuilder();
        eventBuilder.withExtra("url", url);
        eventBuilder.withExtra("method", request.getMethod());
        addParams(request, eventBuilder);
        addHeaders(request, eventBuilder);
        addUser(request, eventBuilder);
        eventBuilder.withExtra("localPort", request.getLocalPort());
        eventBuilder.withExtra("localAddr", request.getLocalAddr());
        eventBuilder.withMessage(e.getMessage()).withLevel(Event.Level.ERROR).withSentryInterface(new ExceptionInterface(e));
        Sentry.capture(eventBuilder);
    }

    private static void addParams(HttpServletRequest request, EventBuilder eventBuilder) {
        Map<String, String[]> map = request.getParameterMap();
        if (map != null && !map.isEmpty()) {
            eventBuilder.withExtra("params", map);
        }
        try {
            String body = request.getReader().lines().collect(Collectors.joining(System.lineSeparator()));
            if (!StringUtils.isBlank(body)) {
                eventBuilder.withExtra("body", body);
            }
        } catch (Exception ignore) {
        }
    }

    private static void addHeaders(HttpServletRequest request, EventBuilder eventBuilder) {
        Map<String, String> headers = getHeadersInfo(request);
        if (!headers.isEmpty()) {
            eventBuilder.withExtra("headers", headers);
        }
    }

    private static Map<String, String> getHeadersInfo(HttpServletRequest request) {
        Map<String, String> map = new HashMap<>();
        try {
            Enumeration headerNames = request.getHeaderNames();
            if (headerNames == null) return map;
            while (headerNames.hasMoreElements()) {
                String key = (String) headerNames.nextElement();
                String value = request.getHeader(key);
                map.put(key, value);
            }
            return map;
        } catch (Exception ignore) {
        }
        return map;
    }

    private static void addUser(HttpServletRequest request, EventBuilder eventBuilder) {
        String host = request.getRemoteHost();
        if (!StringUtils.isBlank(host)) {
//            User user = new User(null, null, host, null);
//            Sentry.getContext().setUser(user);
            eventBuilder.withExtra("remoteHost", host);
        }
    }
}

使用的类可能如下：

@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(CustomException.class)
    @ResponseBody
    Response handleCustomException(CustomException customException) {
        customException.printStackTrace();
        return customException.getError();
    }
}

本文本质上是对自建 sentry 并与 spring boot 集成和 spring boot 全局异常拦截并通过 webhook 发送到钉钉机器人的补充。

HttpServletRequest 获取参数、header、body

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