使用java代码本地测试远程rpc接口

背景：公司开发的系统在本地运行太过麻烦，并且该系统使用dubbo管理服务，使用rpc进行不同应用间的通信。某次开发的时候需要查看调用rpc接口后的返回结果，操作起来太麻烦。于是尝试本地使用java程序直接调用rpc接口进行调试。在此记录代码，抽空把它封装成一个测试dubbo的rpc接口的程序

java代码

package test.kgtone;
import com.alibaba.dubbo.config.ApplicationConfig;
import com.alibaba.dubbo.config.ReferenceConfig;
import com.alibaba.dubbo.config.RegistryConfig;
import com.alibaba.dubbo.config.utils.ReferenceConfigCache;
import com.alibaba.dubbo.rpc.service.GenericService;
import com.alibaba.fastjson.JSON;

public class TestRpc {
    public static void main(String[] args) {
        //参数配置----------------------------------
        String zk_addr = "zookeeper://172.21.65.26:2181";
        int timeout = 300000;
        String group = "LS";
        String ifce = "com.pt.poseidon.org.api.IOrgService";
        String methodName = "getOrgByNo";
        String[] paramTypes = new String[]{"java.lang.String"};
        Object[] params = new Object[]{"35402"};
        
        //服务调用代码--------------------------------
        ReferenceConfig<GenericService> reference = new ReferenceConfig<GenericService>();
        reference.setApplication(new ApplicationConfig("mamb-test"));
        reference.setRegistry(new RegistryConfig(zk_addr));
        reference.setGeneric(true);
        reference.setTimeout(timeout);
        reference.setGroup(group);
        reference.setInterface(ifce);
        ReferenceConfigCache cache = ReferenceConfigCache.getCache();
        GenericService genericService = cache.get(reference);
        Object result = genericService.$invoke(methodName, paramTypes,params );
        System.out.println(JSON.toJSONString(result));
    }
}

pom.xml文件

<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>priv.kgtone</groupId>
    <artifactId>dubbo-rpc-test</artifactId>
    <version>1.0.0</version>
    <dependencies>
        <dependency>
            <groupId>org.javassist</groupId>
            <artifactId>javassist</artifactId>
            <version>3.14.0-GA</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.alibaba/dubbo-rpc-api -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>dubbo</artifactId>
            <version>2.8.4</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.alibaba/dubbo-rpc-api -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.12</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/com.101tec/zkclient -->
        <dependency>
            <groupId>com.101tec</groupId>
            <artifactId>zkclient</artifactId>
            <version>0.4</version>
        </dependency>
        <!--netty jar-->
        <dependency>
            <groupId>io.netty</groupId>
            <artifactId>netty</artifactId>
            <version>3.7.0.Final</version>
        </dependency>
    </dependencies>
</project>

log4j.properties文件

# Global logging configuration   debug
#log4j.rootLogger=DEBUG, stdout
log4j.rootLogger=ERROR, stdout
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n

---

此过程中踩过的坑如下：

1.刚开始忽视了log4j.properties的日志配置文件，认为不用输出什么日志，很快就可以弄好。实际上没有输出日志，很难定位异常的位置。

2.刚没有添加netty的依赖，报错程序启动后报错找不到服务提供者。后来添加上log4j的日志配置，很快定位到是netty的依赖没有加入的原因。