10.从零搭建WebApi接口开发框架-记录请求日志log

在开发中，需要记录接口的请求日志及返回日志，便于回溯原因。这里面请求日志为什么要单独拿出来讲，是因为当前是以post body的方式提交接口请求，body是以stream的方式接收，如果在拦截器中获取该body内容后，真实请求中将捕获不到该参数了，因此需要引入BodyReaderHttpServletRequestWrapper 来实现接口的请求日志记录。

pom.xml增加依赖

<dependency>
    <groupId>org.jodd</groupId>
    <artifactId>jodd-core</artifactId>
    <version>3.9</version>
</dependency>

用于获取当前request中的stream信息

BodyReaderHttpServletRequestWrapper 重新包装request

public class BodyReaderHttpServletRequestWrapper extends HttpServletRequestWrapper {

    /**
     * 定义字节流
     */
    private final byte[] body;

    /**
     * 把请求的http包装一下
     *
     * @param request request
     * @throws IOException IO异常
     */
    public BodyReaderHttpServletRequestWrapper(HttpServletRequest request)
            throws IOException {
        super(request);
        // body = StreamUtil.readBytes(request.getReader(), JoddDefault.encoding);
        // 因为http协议默认传输的编码就是iso-8859-1,如果使用utf-8转码乱码的话，可以尝试使用iso-8859-1
        body = StreamUtil.readBytes(request.getReader(), "UTF-8");
    }

    @Override
    public BufferedReader getReader() throws IOException {
        return new BufferedReader(new InputStreamReader(getInputStream()));
    }

    @Override
    public ServletInputStream getInputStream() throws IOException {
        final ByteArrayInputStream bais = new ByteArrayInputStream(body);
        return new ServletInputStream() {

            @Override
            public boolean isFinished() {
                return false;
            }

            @Override
            public boolean isReady() {
                return false;
            }

            @Override
            public void setReadListener(ReadListener readListener) {

            }

            @Override
            public int read() throws IOException {
                return bais.read();
            }
        };
    }
}

HttpServletRequestReplacedFilter 新建过滤器替换request的body

public class HttpServletRequestReplacedFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {
        //Do nothing
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
        ServletRequest requestWrapper = null;
        if (request instanceof HttpServletRequest) {
            requestWrapper = new BodyReaderHttpServletRequestWrapper((HttpServletRequest) request);
        }
        chain.doFilter(requestWrapper, response);
    }

    @Override
    public void destroy() {
        //Do nothing
    }

}

LogInterceptor利用拦截器来记录日志

public class LogInterceptor implements HandlerInterceptor {
    /**
     * 定义日志
     */
    private static Logger logger = LoggerFactory.getLogger("operationLog");

    /**
     * 记录操作日志
     *
     * @param request  request
     * @param response response
     * @param handler  handler
     * @return 处理是否成功
     * @throws Exception 异常
     */
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        //校验权限
        String path = request.getServletPath();
        String contentType = request.getContentType();
        if (contentType != null && contentType.equals("application/json")) {
            // 只有json请求才记录日志，上传文件的不记录
            //参数
            String parameters = StringUtil.getBodyString(request.getReader());
            User user = TokenUtil.getToken(request);
            logOperation(path, parameters, user);
        }
        return true;
    }

    /**
     * 记录文本日志
     *
     * @param path       路径
     * @param parameters 参数值
     * @param user       user
     */
    public void logOperation(String path, String parameters, User user) {
        String log = "";
        if (user == null) {
            user = new User();
        }
        log = "[OPERALOG-操作日志]" + "-[" + user.getUsername() + "]" + "-[" + getSystemTime() + "]-" + "[INFO]-" + "-" + parameters;
        logger.info(log);
    }

    public static String getSystemTime() {
        String strTime = "";
        DateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        strTime = df.format(new Date());
        return strTime;
    }

    /**
     * @param request      request
     * @param response     response
     * @param handler      handler
     * @param modelAndView modelAndView
     * @throws Exception 异常
     */
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {

    }

    /**
     * @param request  request
     * @param response response
     * @param handler  handler
     * @param ex       异常
     * @throws Exception 异常
     */
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {

    }
}

这里块的代码非常简单，获取当前请求的路径及参数，记录下来，同时如果header中有authorization的话，再取当前的用户信息，这一块可以根据实际需要来修改。

LogConfig 加入需要记录日志的url

@Configuration
public class LogConfig extends WebMvcConfigurerAdapter {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        //校验是否登录拦截器
        registry.addInterceptor(new LogInterceptor())
                //消息相关
                .addPathPatterns("/news/*")
                .addPathPatterns("/checkLogin");
        super.addInterceptors(registry);
    }
}

这一块和控制权限一样，增加一个InterceptorRegistry，并设置需要拦截的url串

请求的日志结果如下所示：

日志结果.png

如果没有BodyReaderHttpServletRequestWrapper对request的重新包装，直接获取body的参数，后续将会报错。

源码下载

本例子详细源码