Consul-Proxy:使用netty实现快速服务注册(一)注册服务并提供服务

曾经终败给现在 2022-02-03 02:41 322阅读 0赞

## Consul-Proxy:使用netty实现快速服务注册 ##

#### 注册服务并提供邮件服务 ####

### 一、背景 ###

Springcloud+consul作为微服务的注册已经见怪不怪了，试下也很流行，在我个人云服务器上，我也是这样做的。

然而，我的云服务器内存比较小，很快内存就被cloud全家桶吃光了，没办法部署其他应用了，因此，我觉得将一些服务独立出去，放弃cloud全家桶。

Consul-proxy使用netty+consul实现服务注册，并提供了若干简单的注解实现了http的mapping映射处理。

简单来说，没错，是因为穷，才有了这个组件。

本例就使用邮件发送服务作为示例使用consul-proxy。

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### 二、Maven配置 ###

要使用consul-proxy，只需要加入下面依赖即可。

<dependency>
    	<groupId>cn.pomit</groupId>
    	<artifactId>consul-proxy</artifactId>
    	<version>1.3</version>
    </dependency>

但是要完整的运行，还是需要其他依赖的，比如netty和json相关的jar包。

如果想使用mybatis连接数据库，还需要引入mybatis，这里使用了mybatis-proxy工具，mybatis-proxy工具对mybatis做了简单的封装，方便在非spring环境下使用mybatis。

完整的依赖如下：

<?xml version="1.0"?>
    <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
    	<modelVersion>4.0.0</modelVersion>
    
    	<groupId>cn.pomit</groupId>
    	<artifactId>consul-proxy-demo</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<name>consul-proxy-demo</name>
    	<url>http://maven.apache.org</url>
    	<properties>
    		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    		<dbcp.version>2.4.0</dbcp.version>
    	</properties>
    	<dependencies>
    		<dependency>
    			<groupId>com.alibaba</groupId>
    			<artifactId>fastjson</artifactId>
    			<version>1.2.40</version>
    		</dependency>
    		<dependency>
    			<groupId>cn.pomit</groupId>
    			<artifactId>consul-proxy</artifactId>
    			<version>1.3</version>
    		</dependency>
    		<dependency>
    			<groupId>org.slf4j</groupId>
    			<artifactId>slf4j-log4j12</artifactId>
    			<version>1.7.25</version>
    		</dependency>
    		<dependency>
    		   <groupId>com.sun.mail</groupId>
    		   <artifactId>javax.mail</artifactId>
    		   <version>1.6.1</version>
    		</dependency>
    	</dependencies>
    	<build>
    		<plugins>
    			<plugin>  
                <groupId>org.apache.maven.plugins</groupId>  
                <artifactId>maven-shade-plugin</artifactId>  
                <version>3.1.0</version>  
                <executions>  
                    <execution>  
                        <phase>package</phase>  
                        <goals>  
                            <goal>shade</goal>  
                        </goals>  
                        <configuration>  
                            <transformers>  
                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">  
                                    <mainClass>cn.pomit.consulproxy.ConsulApp</mainClass>  
                                </transformer>  
                            </transformers> 
                        </configuration>  
                    </execution>  
                </executions>  
            </plugin>  
    
    		</plugins>
    	</build>
    </project>

以上maven的配置中，除了依赖以外，还有shade插件的配置，方便打包成可执行jar包。

说到这里，需要提一下的是，如果打包后运行报错:java.lang.SecurityException: Invalid signature file digest for Manifest main attributes 异常，可以在 节点下增加即可。

<configuration>  
    	<filters>		              
    		<filter>
    			<artifact>*:*</artifact>
    			<excludes>
    				<exclude>META-INF/*.SF</exclude>
    				<exclude>META-INF/*.DSA</exclude>
    				<exclude>META-INF/*.RSA</exclude>
    			</excludes>
    		</filter>
    	</filters>
    	<transformers>  
    		<transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">  
    			<mainClass>cn.pomit.consulproxy.ConsulApp</mainClass>  
    		</transformer>  
    	</transformers> 
    </configuration>

### 三、使用方法 ###

#### 3.1 启动类 ####

启动类要加上@EnableServer，指明被管理的handler，每个被管理的handler就相当于spring中的一个controller。

import cn.pomit.consul.ConsulProxyApplication;
    import cn.pomit.consul.annotation.EnableServer;
    import cn.pomit.consul.annotation.InitConfiguration;
    import cn.pomit.consulproxy.config.MailConfiguration;
    import cn.pomit.consulproxy.handler.EmailRestHandler;
    
    @EnableServer(handler = {  EmailRestHandler.class})
    @InitConfiguration(configurations = {  MailConfiguration.class })
    public class ConsulApp { 
    	public static void main(String[] args) { 
    		ConsulProxyApplication.run(ConsulApp.class, args);
    	}
    
    }

#### 3.2 邮件服务的配置读取 ####

consul-proxy工具可以自动读取解析@InitConfiguration注解，并调用注解指定的配置类的initConfiguration方法，这个方法要声明为static方法，并有Properties 参数，consul-proxy会自动将程序的配置传递给这个initConfiguration方法。

这里将Properties 传递给MailConfiguration进行初始化，方便读取配置。

MailConfiguration ：

import java.util.Properties;
    
    public class MailConfiguration { 
    	private static MailConfiguration instance = null;
    	private String mailUserName;
    	private String mailPassword;
    	private String mailFrom;
    	private String mailFromName;
    	private Properties mailproperties;
    
    	public static void initConfiguration(Properties properties) { 
    		instance = new MailConfiguration();
    		instance.mailUserName = properties.getProperty("mail.username");
    		instance.mailPassword = properties.getProperty("mail.password");
    		instance.mailFrom = properties.getProperty("mail.from");
    		instance.mailFromName = properties.getProperty("mail.fromName");
    		instance.mailproperties = new Properties();
    		instance.mailproperties.put("mail.smtp.host", properties.getProperty("mail.host"));
    		instance.mailproperties.put("mail.smtp.port", properties.getProperty("mail.port"));
    		instance.mailproperties.put("mail.smtp.auth", properties.getProperty("mail.properties.mail.smtp.auth"));
    		instance.mailproperties.put("mail.smtp.starttls.enable",
    				properties.getProperty("mail.properties.mail.smtp.starttls.enable"));
    		instance.mailproperties.put("mail.smtp.ssl.enable",
    				properties.getProperty("mail.properties.mail.smtp.ssl.enable"));
    		instance.mailproperties.put("mail.smtp.starttls.required",
    				properties.getProperty("mail.properties.mail.smtp.starttls.required"));
    	}
    
    	public static MailConfiguration getInstance() { 
    		return instance;
    	}
    
    	public String getMailUserName() { 
    		return mailUserName;
    	}
    
    	public void setMailUserName(String mailUserName) { 
    		this.mailUserName = mailUserName;
    	}
    
    	public String getMailPassword() { 
    		return mailPassword;
    	}
    
    	public void setMailPassword(String mailPassword) { 
    		this.mailPassword = mailPassword;
    	}
    
    	public String getMailFrom() { 
    		return mailFrom;
    	}
    
    	public void setMailFrom(String mailFrom) { 
    		this.mailFrom = mailFrom;
    	}
    
    	public Properties getMailproperties() { 
    		return mailproperties;
    	}
    
    	public void setMailproperties(Properties mailproperties) { 
    		this.mailproperties = mailproperties;
    	}
    
    	public String getMailFromName() { 
    		return mailFromName;
    	}
    
    	public void setMailFromName(String mailFromName) { 
    		this.mailFromName = mailFromName;
    	}
    }

#### 3.3 Handler处理类 ####

下面是EmailRestHandler类，使用json处理相关数据，发送邮件，返回json结果。

EmailRestHandler：

import java.nio.charset.Charset;
    
    import com.alibaba.fastjson.JSONObject;
    
    import cn.pomit.consul.annotation.Mapping;
    import cn.pomit.consul.handler.resource.AbstractResourceHandler;
    import cn.pomit.consul.http.HttpRequestMessage;
    import cn.pomit.consul.http.HttpResponseMessage;
    import cn.pomit.consul.http.res.ResCode;
    import cn.pomit.consul.http.res.ResType;
    import cn.pomit.consulproxy.dto.ResultCode;
    import cn.pomit.consulproxy.dto.ResultModel;
    import cn.pomit.consulproxy.dto.mail.Email;
    import cn.pomit.consulproxy.service.mail.MailService;
    
    public class EmailRestHandler extends AbstractResourceHandler { 
    
    	@Mapping(value = "/email/code")
    	public HttpResponseMessage findUser(HttpRequestMessage httpRequestMessage) { 
    		ResultModel rm = null;
    
    		try { 
    			String content = httpRequestMessage.getBody().toString(Charset.defaultCharset());
    			Email email = JSONObject.parseObject(content, Email.class);
    			if (email == null) { 
    				rm = new ResultModel(ResultCode.CODE_00003);
    			} else { 
    				MailService.sendHtmlMail(email);
    				rm = ResultModel.ok();
    			}
    		} catch (Exception e) { 
    			e.printStackTrace();
    			rm = ResultModel.error(e.getMessage());
    		}
    		HttpResponseMessage httpResponseMessage = new HttpResponseMessage();
    		httpResponseMessage.setResCode(ResCode.OK.getValue());
    		httpResponseMessage.setResType(ResType.JSON.getValue());
    		httpResponseMessage.setMessage(JSONObject.toJSONString(rm));
    		return httpResponseMessage;
    	}
    
    	@Mapping(value = "/health")
    	public HttpResponseMessage add(HttpRequestMessage httpRequestMessage) throws Exception { 
    		HttpResponseMessage httpResponseMessage = new HttpResponseMessage();
    		httpResponseMessage.setResCode(ResCode.OK.getValue());
    		httpResponseMessage.setResType(ResType.JSON.getValue());
    		httpResponseMessage.setMessage("echo");
    		return httpResponseMessage;
    	}
    
    }

#### 3.4 Service处理逻辑层 ####

由于不是spring环境，Service每次使用需要自己new一个对象了。这里的MailService 是调用javax.mail的逻辑。

MailService ：

import java.util.Date;
    
    import javax.mail.Authenticator;
    import javax.mail.BodyPart;
    import javax.mail.Message;
    import javax.mail.Multipart;
    import javax.mail.PasswordAuthentication;
    import javax.mail.Session;
    import javax.mail.Transport;
    import javax.mail.internet.InternetAddress;
    import javax.mail.internet.MimeBodyPart;
    import javax.mail.internet.MimeMessage;
    import javax.mail.internet.MimeMultipart;
    
    import cn.pomit.consulproxy.config.MailConfiguration;
    import cn.pomit.consulproxy.dto.mail.Email;
    
    public class MailService { 
    
    	/** * 发送Html邮件 * * @throws Exception */
    	public static void sendHtmlMail(Email email) throws Exception { 
    
    		// 根据邮件会话属性和密码验证器构造一个发送邮件的session
    		Session sendMailSession = Session.getDefaultInstance(MailConfiguration.getInstance().getMailproperties(),
    				new Authenticator() { 
    					@Override
    					protected PasswordAuthentication getPasswordAuthentication() { 
    						return new PasswordAuthentication(MailConfiguration.getInstance().getMailUserName(),
    								MailConfiguration.getInstance().getMailPassword());
    					}
    				});
    		// 根据session创建一个邮件消息
    		Message mailMessage = new MimeMessage(sendMailSession);
    		// 设置邮件消息的发送者
    		mailMessage.setFrom(new InternetAddress(MailConfiguration.getInstance().getMailFrom(),
    				MailConfiguration.getInstance().getMailFromName()));
    		// 创建邮件的接收者地址，并设置到邮件消息中
    		mailMessage.setRecipient(Message.RecipientType.TO, new InternetAddress(email.getTo()));
    		// 设置邮件消息的主题
    		mailMessage.setSubject(email.getSubject());
    		// 设置邮件消息发送的时间
    		mailMessage.setSentDate(new Date());
    
    		// MiniMultipart类是一个容器类，包含MimeBodyPart类型的对象
    		Multipart mainPart = new MimeMultipart();
    		// 创建一个包含HTML内容的MimeBodyPart
    		BodyPart html = new MimeBodyPart();
    		// 设置HTML内容
    		html.setContent(email.getContent(), "text/html; charset=utf-8");
    		mainPart.addBodyPart(html);
    		// 将MiniMultipart对象设置为邮件内容
    		mailMessage.setContent(mainPart);
    		// 发送邮件
    		Transport.send(mailMessage);
    	}
    }

#### 3.5 过程中使用到的实体 ####

Email :

public class Email { 
    	String to;
    	String subject;
    	String content;
    	boolean html = true;
    	
    	public String getTo() { 
    		return to;
    	}
    	public void setTo(String to) { 
    		this.to = to;
    	}
    	public String getSubject() { 
    		return subject;
    	}
    	public void setSubject(String subject) { 
    		this.subject = subject;
    	}
    	public String getContent() { 
    		return content;
    	}
    	public void setContent(String content) { 
    		this.content = content;
    	}
    	public boolean isHtml() { 
    		return html;
    	}
    	public void setHtml(boolean html) { 
    		this.html = html;
    	}
    	
    }

ResultCode:

public enum ResultCode { 
    
    	/** * 通用 */
    	CODE_00000("00000", "操作成功"), 
    	CODE_00001("00001", "请求失败"), 
    	CODE_00002("00002", "未授权的请求"), 
    	CODE_00003("00003", "非法的参数字段"), 
    	CODE_00004("00004", "异常抛出"), 
    	CODE_00005("00005", "权限不足"), 
    	CODE_00006("00006", "分页limit参数错误"), 
    	CODE_00007("00007", "分页offset参数错误"), 
    	CODE_00009("00009", "未登录或登录状态已失效"), 
    	CODE_00010("00010", "数据已存在"), 
    	CODE_00011("00011", "数据不存在"), 
    	CODE_00012("00012", "参数缺失"), 
    	CODE_00013("00013", "系统维护中"), 
    	CODE_00014("00014", "登录失败"), 
    	CODE_00015("00015", "token失效"), 
    	CODE_00016("00016", "签名错误"),
    
    	CODE_99999("99999", "签名无效");
    
    	private String code;
    	private String desc;
    
    	ResultCode(String code, String desc) { 
    		this.code = code;
    		this.desc = desc;
    	}
    
    	public String getCode() { 
    		return code;
    	}
    
    	public String getDesc() { 
    		return desc;
    	}
    
    	/** * 根据code匹配枚举 * * @param code * @return */
    	public static ResultCode getResultCodeByCode(String code) { 
    		for (ResultCode resultCode : ResultCode.values()) { 
    			if (code.equals(resultCode.getCode())) { 
    				return resultCode;
    			}
    		}
    		return null;
    	}
    
    	public static ResultCode getResultCodeByDesc(String desc) { 
    		for (ResultCode resultCode : ResultCode.values()) { 
    			if (desc.equals(resultCode.getDesc())) { 
    				return resultCode;
    			}
    		}
    		return null;
    	}
    }

ResultModel :

public class ResultModel { 
    
    	private String errorCode;
    	private String message;
    	private Object remark;
    	private Object data;
    
    	public ResultModel(String errorCode, String message) { 
    		this.errorCode = errorCode;
    		this.message = message;
    	}
    
    	public ResultModel() { 
    	}
    
    	public ResultModel(String errorCode, String message, Object data) { 
    		this.errorCode = errorCode;
    		this.message = message;
    		this.data = data;
    	}
    
    	public ResultModel(ResultCode resultCodeEnum, Object data) { 
    		this.errorCode = resultCodeEnum.getCode();
    		this.message = resultCodeEnum.getDesc();
    		this.data = data;
    	}
    
    	public ResultModel(ResultCode resultCodeEnum, Object data, Object remark) { 
    		this.errorCode = resultCodeEnum.getCode();
    		this.message = resultCodeEnum.getDesc();
    		this.data = data;
    		this.remark = remark;
    	}
    
    	public ResultModel(ResultCode resultCodeEnum) { 
    		this.errorCode = resultCodeEnum.getCode();
    		this.message = resultCodeEnum.getDesc();
    	}
    
    	public String getErrorCode() { 
    		return errorCode;
    	}
    
    	public void setErrorCode(String errorCode) { 
    		this.errorCode = errorCode;
    	}
    
    	public String getMessage() { 
    		return message;
    	}
    
    	public void setMessage(String message) { 
    		this.message = message;
    	}
    
    	public Object getData() { 
    		return data;
    	}
    
    	public void setData(Object data) { 
    		this.data = data;
    	}
    
    	public static ResultModel ok() { 
    		return new ResultModel(ResultCode.CODE_00000);
    	}
    
    	public static ResultModel ok(Object data) { 
    		return new ResultModel(ResultCode.CODE_00000, data);
    	}
    
    	public static ResultModel unAuth() { 
    		return new ResultModel(ResultCode.CODE_00002);
    	}
    
    	public static ResultModel unAuth(Object data) { 
    		return new ResultModel(ResultCode.CODE_00002, data);
    	}
    
    	public static ResultModel error(String message) { 
    		return new ResultModel(ResultCode.CODE_00001.getCode(), message);
    	}
    
    	public Object getRemark() { 
    		return remark;
    	}
    
    	public void setRemark(Object remark) { 
    		this.remark = remark;
    	}
    
    }

### 四、配置文件 ###

#### 4.1 application.properties ####

在classpath下添加application.properties

spring.profiles.active=loc
    application.name=consulProxy
    application.port=8999

这个指定了带环境的配置文件可以读取classpath下的application-loc.properties

application-loc.properties:

consul.host=127.0.0.1
    consul.port=8500
    #consul.instanceId=cunsul-proxy-8888
    #consul.scheme=https
    #consul.healthCheckUrl=/health
    consul.healthCheckPath=/health
    #consul.healthCheckInterval=10s
    #consul.healthCheckTimeout=100s
    consul.preferIpAddress=true
    
    mail.host=smtp.qq.com
    mail.username=xxx@qq.com
    mail.password=xxxx
    mail.port=465
    mail.properties.mail.smtp.auth=true
    mail.properties.mail.smtp.starttls.enable=true
    mail.properties.mail.smtp.ssl.enable=true
    mail.properties.mail.smtp.starttls.required=true 
    
    mail.from=916881512@qq.com
    mail.fromName=Admin

如果不带环境，直接把application-loc.properties的配置写在application.properties也是一样的。

这里面，以mail.开发的配置，是我们在MailConfiguration里面需要的自定义配置。其他配置为consul-proxy需要的配置。

#### 4.2 log4j.properties ####

使用log4j，log4j的配置文件写在classpath下即可：

# DEBUG,INFO,WARN,ERROR,FATAL
    LOG_LEVEL=DEBUG
    
    log4j.rootLogger=${LOG_LEVEL},CONSOLE,FILE
    
    log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
    log4j.appender.CONSOLE.Encoding=utf-8
    log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout
    #log4j.appender.CONSOLE.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss} %C{8}@(%F:%L):%m%n 
    log4j.appender.CONSOLE.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss} %C{1}@(%F:%L):%m%n
    
    log4j.appender.FILE=org.apache.log4j.DailyRollingFileAppender
    log4j.appender.FILE.File=logs/workorder.log
    log4j.appender.FILE.Encoding=utf-8
    log4j.appender.FILE.DatePattern='.'yyyy-MM-dd
    log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
    #log4j.appender.FILE.layout=org.apache.log4j.HTMLLayout
    log4j.appender.FILE.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH\:mm\:ss} %C{8}@(%F\:%L)\:%m%n

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