Camel错误处理例子

今天想写一下ApacheCamel的错误处理。Camel的错误处理和Java的错误处理有很大不同。在Java中我们通过try，catch捕获异常以后处理异常。但是，Camel中我们是先定义路由，然后程序一次性读入所有路由，在路由被调用时才可能会发生异常，而且当发生异常时也要保证后面的路由还可以被正确调用，而不能停止。

Camel中有错误处理器，异常策略的概念。错误处理器真对于所有异常，异常策略针对于指定异常。他们都可以设定返还策略（返还回数，时间间隔，日志级别…）等。

下面上代码，这个程序我是根据以前写的JDBC组件程序改的。

程序结构

JDBCLogErrorProcess.java

package com.camel.jdbc.process;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.log4j.Logger;

public class JDBCLogErrorProcess implements Processor{
	public static final Logger logger = Logger.getLogger(JDBCLogErrorProcess.class);
	public void process(Exchange exchange) throws Exception {
		Exception e = exchange.getProperty(Exchange.EXCEPTION_CAUGHT,Exception.class);
		if(null != e){
			logger.info("++++++++++++++++++++++++++++++++++++++");
			logger.info("[JDBC路由][ERROR]errorMSG=" + e.getMessage());
			logger.info("++++++++++++++++++++++++++++++++++++++");
		}else{
			logger.info("++++++++++++++++++++++++++++++++++++++");
			logger.info("[JDBC路由][TO]exchangeId=" + exchange.getExchangeId() + "|fromRouteId=" +exchange.getFromRouteId());
		}
	}
}

JDBCLogFromProcess.java

package com.camel.jdbc.process;

import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.log4j.Logger;

public class JDBCLogFromProcess implements Processor{
	public static final Logger logger = Logger.getLogger(JDBCLogFromProcess.class);
	public void process(Exchange exchange) throws Exception {
		logger.info("[JDBC路由][FROM]exchangeId=" + exchange.getExchangeId() + "|fromRouteId=" +exchange.getFromRouteId());
	}
}

JDBCLogToProcess.java

package com.camel.jdbc.process;

import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.log4j.Logger;

public class JDBCLogToProcess implements Processor{
	public static final Logger logger = Logger.getLogger(JDBCLogToProcess.class);
	public void process(Exchange exchange) throws Exception {
		logger.info("[JDBC路由][TO]exchangeId=" + exchange.getExchangeId() + "|fromRouteId=" +exchange.getFromRouteId());
	}
}

JDBCRoute.java

package com.camel.jdbc.route;
import org.apache.camel.LoggingLevel;
import org.apache.camel.builder.RouteBuilder;
import org.apache.log4j.Logger;
import com.camel.jdbc.process.JDBCLogFromProcess;
import com.camel.jdbc.process.JDBCLogToProcess;
import com.camel.jdbc.process.JDBCLogErrorProcess;

public class JDBCRoute extends RouteBuilder {
	Logger logger = Logger.getLogger(JDBCRoute.class);
	public void configure() {
		try {
			// 全局错误处理器为默认错误处理器
			errorHandler(defaultErrorHandler());

			// 当路由中发生异常时处理
			onException(Exception.class)         // 捕获所有异常
			.handled(true)                       // 路由停止将错误信息返回给最初的消费者
			.maximumRedeliveries(2)              // 路由尝试返还2次
			.redeliveryDelay(1000)               // 每次返还间隔1秒
			.retryAttemptedLogLevel(LoggingLevel.INFO)   // 返还时日志级别设为INFO
			.retriesExhaustedLogLevel(LoggingLevel.INFO) // 返还失败时日志级别设为INFO
			.process(new JDBCLogErrorProcess()); // 最终异常发生时处理

			// 定时任务，每60秒执行一次
			// from为路由入口
			from("timer://queryAward?period=60s")
			.process(new JDBCLogFromProcess())     // 输出路由From日志
			.bean(sql.class, "getAll")             // 设定SQL
			.to("jdbc:DataSource")                 // 取数据库结果
			.split(body())
			.setBody(simple("insert into ordertb values('${body[orderId]}','${body[goodsId]}','${body[name]}')"))
			.to("jdbc:DataSource")
			.process(new JDBCLogToProcess());      // 输出路由To日志
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

sql.java

package com.camel.jdbc.route;

public class sql {
	public String getAll(){
		return "select * from orders";
	}
}

CamelJDBCServer.java

package com.camel.jdbc.server;
import org.apache.camel.impl.DefaultCamelContext;
import org.apache.camel.impl.SimpleRegistry;
import org.apache.camel.model.ModelCamelContext;
import org.apache.commons.dbcp2.BasicDataSource;
import org.apache.log4j.Logger;
import com.camel.jdbc.route.JDBCRoute;

public class CamelJDBCServer {
	public static final Logger logger = Logger.getLogger(CamelJDBCServer.class);

	public static void main(String[] args) {
		final String url = "jdbc:mysql://127.0.0.1:3306/test";
		BasicDataSource basicDataSource = new BasicDataSource();
		basicDataSource.setDriverClassName("com.mysql.jdbc.Driver");
		basicDataSource.setUsername("root");
		basicDataSource.setPassword("root");
		basicDataSource.setUrl(url);
		SimpleRegistry simpleregistry = new SimpleRegistry();
		simpleregistry.put("DataSource", basicDataSource);

		try {
			ModelCamelContext camelContext = new DefaultCamelContext(simpleregistry);
			camelContext.start();
			camelContext.addRoutes(new JDBCRoute());
			// 没有具体业务意义的代码，只是为了保证主线程不退出
			synchronized (CamelJDBCServer.class) {
				CamelJDBCServer.class.wait();
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

log4j.properties

 ### \u8BBE\u7F6E###
log4j.rootLogger = info,stdout,D,E

### \u8F93\u51FA\u4FE1\u606F\u5230\u63A7\u5236\u62AC ###
log4j.appender.stdout = org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target = System.out
log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

### \u8F93\u51FADEBUG \u7EA7\u522B\u4EE5\u4E0A\u7684\u65E5\u5FD7\u5230=D://logs/error.log ###
log4j.appender.D = org.apache.log4j.DailyRollingFileAppender
log4j.appender.D.File = E://logs/log.log
log4j.appender.D.Append = true
log4j.appender.D.Threshold = DEBUG 
log4j.appender.D.layout = org.apache.log4j.PatternLayout
log4j.appender.D.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

### \u8F93\u51FAERROR \u7EA7\u522B\u4EE5\u4E0A\u7684\u65E5\u5FD7\u5230=D://logs/error.log ###
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.File =E://logs/error.log 
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR 
log4j.appender.E.layout = org.apache.log4j.PatternLayout
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss}  [ %t:%r ] - [ %p ]  %m%n

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com</groupId>
	<artifactId>camel-example-JDBC</artifactId>
	<version>0.0.1-SNAPSHOT</version>

	<dependencies>
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.11</version>
			<scope>test</scope>
		</dependency>

		<!-- 数据源 -->
		<dependency>
			<groupId>commons-dbcp</groupId>
			<artifactId>commons-dbcp</artifactId>
			<version>1.4</version>
		</dependency>

		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.34</version>
		</dependency>

		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis</artifactId>
			<version>3.4.1</version>
		</dependency>

		<!-- spring整合mybatis -->
		<dependency>
			<groupId>org.mybatis</groupId>
			<artifactId>mybatis-spring</artifactId>
			<version>1.3.0</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
			<version>4.2.0.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-orm</artifactId>
			<version>4.2.0.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-expression</artifactId>
			<version>4.2.0.RELEASE</version>
		</dependency>

		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
			<version>4.2.0.RELEASE</version>
			<scope>test</scope>
		</dependency>

		<dependency>
			<groupId>org.apache.camel</groupId>
			<artifactId>camel-core</artifactId>
			<version>2.17.5</version>
		</dependency>

		<dependency>
			<groupId>org.apache.camel</groupId>
			<artifactId>camel-spring</artifactId>
			<version>2.17.5</version>
		</dependency>

		<dependency>
			<groupId>org.apache.camel</groupId>
			<artifactId>camel-jetty</artifactId>
			<version>2.17.5</version>
		</dependency>

		<dependency>
			<groupId>org.apache.camel</groupId>
			<artifactId>camel-jdbc</artifactId>
			<version>2.17.5</version>
		</dependency>

		<dependency>
			<groupId>commons-io</groupId>
			<artifactId>commons-io</artifactId>
			<version>2.5</version>
		</dependency>

		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-api</artifactId>
			<version>1.7.12</version>
		</dependency>
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>1.7.12</version>
		</dependency>

		<dependency>
			<groupId>org.json</groupId>
			<artifactId>json</artifactId>
			<version>20180130</version>
		</dependency>

		<dependency>
			<groupId>org.apache.commons</groupId>
			<artifactId>commons-dbcp2</artifactId>
			<version>2.1.1</version>
		</dependency>
	</dependencies>

</project>

经测试运行结果符合预期。

原文链接：https://blog.csdn.net/weixin_41368339/article/details/80070725

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