客戶端

專案接入CAT監控：
maven依賴

<dependency>
 <groupId>com.dianping.cat</groupId>
 <artifactId>cat-client</artifactId>
 <version>3.0.0</version>
</dependency>

專案中創建src/main/resources/META-INF/app.properties寫入：
app.name={appName}

appName (a-z, A-Z) (0-9) (_) (-)

spring boot接入

CatFilterConfigure.java

@Configuration
public class CatFilterConfigure {

    @Bean
    public FilterRegistrationBean catFilter() {
        FilterRegistrationBean registration = new FilterRegistrationBean();
        CatFilter filter = new CatFilter();
        registration.setFilter(filter);
        registration.addUrlPatterns("/*");
        registration.setName("cat-filter");
        registration.setOrder(1);
        return registration;
    }

}

Mybatis接入

CatMybatisInterceptor.java

@Intercepts({
        @Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class}),
        @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class,
                RowBounds.class, ResultHandler.class}),
        @Signature(type = Executor.class, method = "query",
                args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class, CacheKey.
                        class, BoundSql.class}
        )})
public class CatMybatisInterceptor implements Interceptor {

    private Properties properties;
    private String datasourceUrl;

    public CatMybatisInterceptor(String datasourceUrl) {
        this.datasourceUrl = datasourceUrl;
    }

    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        //begin cat transaction
        MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
        String methodName = this.getMethodName(mappedStatement);
        Transaction t = Cat.newTransaction("SQL", methodName);
        Cat.logEvent("SQL.Database", datasourceUrl);
        Cat.logEvent("SQL.Method", mappedStatement.getSqlCommandType().name().toLowerCase(), Message.SUCCESS,
                getSql(invocation, mappedStatement));
        try {
            Object returnValue = invocation.proceed();
            t.setStatus(Transaction.SUCCESS);

            return returnValue;
        } catch (Throwable e) {
            Cat.logError(e);
            t.setStatus(e);
            throw e;
        } finally {
            t.complete();
        }
    }

    private String getMethodName(MappedStatement mappedStatement) {
        String[] strArr = mappedStatement.getId().split("\\.");

        return strArr[strArr.length - 2] + "." + strArr[strArr.length - 1];
    }

    private String getSql(Invocation invocation, MappedStatement mappedStatement) {
        Object parameter = null;
        if (invocation.getArgs().length > 1) {
            parameter = invocation.getArgs()[1];
        }
        BoundSql boundSql = mappedStatement.getBoundSql(parameter);
        Configuration configuration = mappedStatement.getConfiguration();

        return showSql(configuration, boundSql);
    }

    private static String getParameterValue(Object obj) {
        StringBuilder retStringBuilder = new StringBuilder();
        if (obj instanceof String) {
            retStringBuilder.append("'").append(obj).append("'");
        } else if (obj instanceof Date) {
            DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT,
                    Locale.CHINA);
            retStringBuilder.append("'").append(formatter.format(new Date())).append("'");
        } else {
            retStringBuilder.append("'").append(obj == null ? "" : obj).append("'");
        }

        return retStringBuilder.toString();
    }

    public static String showSql(Configuration configuration, BoundSql boundSql) {
        Object parameterObject = boundSql.getParameterObject();
        List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
        String sql = boundSql.getSql().replaceAll("[\\s]+", " ");
        StringBuilder sqlBuilder = new StringBuilder(sql);
        if (parameterMappings.size() > 0 && parameterObject != null) {
            int start = sqlBuilder.indexOf("?");
            int end = start + 1;
            TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
            if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
                sqlBuilder.replace(start, end, getParameterValue(parameterObject));
            } else {
                MetaObject metaObject = configuration.newMetaObject(parameterObject);
                for (ParameterMapping parameterMapping : parameterMappings) {
                    String propertyName = parameterMapping.getProperty();
                    if (metaObject.hasGetter(propertyName)) {
                        Object obj = metaObject.getValue(propertyName);
                        sqlBuilder.replace(start, end, getParameterValue(obj));
                    } else if (boundSql.hasAdditionalParameter(propertyName)) {
                        Object obj = boundSql.getAdditionalParameter(propertyName);
                        sqlBuilder.replace(start, end, getParameterValue(obj));
                    }
                    start = sqlBuilder.indexOf("?");
                    end = start + 1;
                }
            }
        }

        return sqlBuilder.toString();
    }

    @Override
    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }

    @Override
    public void setProperties(Properties properties) {
        this.properties = properties;
    }

    public String getDatasourceUrl() {
        return datasourceUrl;
    }

    public void setDatasourceUrl(String datasourceUrl) {
        this.datasourceUrl = datasourceUrl;
    }
}

CatMybatisConfigure

@Configuration
public class CatMybatisConfigure {

    @Value("${spring.datasource.url}")
    private String jdbcUrl;
    @Value("${mybatis.mapper-locations}")
    private String mapperLocations;

    @Bean
    public SqlSessionFactory mysqlSessionFactory(DataSource mysqlDataSource) throws Exception {
        SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();
        sqlSessionFactoryBean.setDataSource(mysqlDataSource);
        PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
        sqlSessionFactoryBean.setMapperLocations(resolver.getResources(mapperLocations));
        sqlSessionFactoryBean.setPlugins(new Interceptor[]{new CatMybatisInterceptor(jdbcUrl)});
        return sqlSessionFactoryBean.getObject();
    }

}

Logback接入

CatLogbackAppender

public class CatLogbackAppender extends AppenderBase<ILoggingEvent> {

    @Override
    protected void append(ILoggingEvent event) {
        try {
            boolean isTraceMode = Cat.getManager().isTraceMode();
            Level level = event.getLevel();
            if (level.isGreaterOrEqual(Level.ERROR)) {
                logError(event);
            } else if (isTraceMode) {
                logTrace(event);
            }
        } catch (Exception ex) {
            throw new LogbackException(event.getFormattedMessage(), ex);
        }
    }

    private void logError(ILoggingEvent event) {
        ThrowableProxy info = (ThrowableProxy) event.getThrowableProxy();
        if (info != null) {
            Throwable exception = info.getThrowable();
            Object message = event.getFormattedMessage();
            if (message != null) {
                Cat.logError(String.valueOf(message), exception);
            } else {
                Cat.logError(exception);
            }
        }
    }

    private void logTrace(ILoggingEvent event) {
        String type = "Logback";
        String name = event.getLevel().toString();
        Object message = event.getFormattedMessage();
        String data;
        if (message instanceof Throwable) {
            data = buildExceptionStack((Throwable) message);
        } else {
            data = event.getFormattedMessage().toString();
        }
        ThrowableProxy info = (ThrowableProxy) event.getThrowableProxy();
        if (info != null) {
            data = data + '\n' + buildExceptionStack(info.getThrowable());
        }
        Cat.logEvent(type, name, "0", data);
    }

    private String buildExceptionStack(Throwable exception) {
        if (exception != null) {
            StringWriter writer = new StringWriter(2048);
            exception.printStackTrace(new PrintWriter(writer));
            return writer.toString();
        } else {
            return "";
        }
    }

}

logback.xml加入如下代碼

<appender name="CatAppender" class="com.xxx.xxx.xxx.log.CatLogbackAppender"></appender>
 <root level="ERROR">
 <appender-ref ref="CatAppender" />
 </root>

如何使用cat

替換appName

直接進入cat，地址：http://192.168.1.120:8080/cat/r/h?domain=appName&ip=All&date=2020111216&reportType=day&op=view
選擇專案

• 查看Transaction報表
• 查看Event報表

自定義上報Transaction
Transaction用來監控一段代碼運行情況：QPSTp
上報Transaction

Transaction t = Cat.newTransaction("URL", "pageName");
try {
 //
 t.setStatus(Transaction.SUCCESS);
} catch (Exception e) {
 t.setStatus(e);
 Cat.logError(e);
} finally {
 t.complete();
}

自定義上報event
event用來監控一段代碼運行次數：，Event報表的整體結構與Transaction報表幾乎一樣，只缺少回應時間的統計
上報event

Event event = Cat.newEvent("Event", "event1");
try {
 //
 event.setSuccessStatus();
} catch (Exception e) {
 event.setStatus("False");
 Cat.logError(e);
} finally {
 event.complete();
}