下载依赖

org.yaml

snakeyaml

1.23

在项目根目录下创建/etc/conifg.yml 配置文件, 输入一条测试数据

test.param: 3

代码测试

import java.io.File;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.util.Map;

import org.yaml.snakeyaml.Yaml;

public class yamlTest {

public static void main(String[] args) throws FileNotFoundException {

Map conf = new Yaml().load(new FileInputStream(new File("./etc/config.yml")));

System.out.println(conf.get("test.param")); // test_gp2

System.out.println(conf.getOrDefault("test.param2", "unknown")); // unknown

}

}

打包测试

在jar包同级目录下创建/etc/confog.yml文件

root@ubuntu:~/jars# tree etc/ sparktest_gp-1.0-SNAPSHOT.jar

etc/

└── config.yml

sparktest_gp-1.0-SNAPSHOT.jar

运行jar包

root@ubuntu:~/jars# java -cp sparktest_gp-1.0-SNAPSHOT.jar main.yamlTest

2

unknown

修改/etc/config.yml文件

test.param: 3

重新运行jar包, 参数改变, 可以在jar包外部修改配置

root@ubuntu:~/jars# java -cp sparktest_gp-1.0-SNAPSHOT.jar main.yamlTest

3

unknown

使用单例模式构建读取配置工具类

package main;

import com.ctc.wstx.api.ReaderConfig;

import org.yaml.snakeyaml.Yaml;

import java.io.File;

import java.io.FileInputStream;

import java.util.Map;

public class Config {

private Map conf;

private static Config instance;

private Config() {

try {

conf = new Yaml().load(new FileInputStream(new File("./etc/config.yml")));

} catch (Exception e) {

e.printStackTrace();

}

}

public static Config getInstance() {

if (instance == null) {

synchronized (ReaderConfig.class) {

if (instance == null) {

instance = new Config();

}

}

}

return instance;

}

public String getString(String param) {

return String.valueOf(conf.get(param));

}

public String getString(String param, String defaultValue) {

if (null == conf.get(param)) {

return defaultValue;

}

return String.valueOf(conf.get(param));

}

public Map getConfig() {

return conf;

}

}

调用测试

import java.util.Map;

public class UseConfig {

public static void main(String[] args) {

Map conf = Config.getInstance().getConfig();

System.out.println(conf);

String parma1 = Config.getInstance().getString("test.param");

System.out.println(parma1);

}

}