Java读取/写入Yaml配置文件

墨蓝 2022-08-23 08:29 1025阅读 0赞

## JYaml文件流读取/写入Yaml配置文件 ##

yaml配置文件格式规范：- 表示sequence(list列表结构)，: 表示map键值对

#以下是示例yaml结构
    
    age: 23
    children: 
      - 
        age: 8
        name: mary1
        sex: man
      - 
        age: 9
        name: simon2
        sex: fatel
    name: simon.zhang
    sex: man

--------------------

1.准备工作，创建Persion实体类

package com.yaml.entity;
    
    import java.util.List;
    
    /** * Created by simon on 16-6-12. */
    public class Person { 
        private String name;
        private int age;
        private String Sex;
        private List<Person> children;
    
        //省略 getter and setter method.....
    }

2.实现读取/写入yaml配置文件

package com.yaml;
    
    import com.yaml.entity.Person;
    import org.ho.yaml.Yaml;
    import org.junit.Test;
    
    import java.io.File;
    import java.io.FileNotFoundException;
    import java.util.ArrayList;
    import java.util.List;
    
    /** * Hello world! */
    public class App {
    
        //写入yaml配置文件
        @Test
        public  void write() {
            /* Initialize data. */
            Person father = new Person();
            father.setName("simon.zhang");
            father.setAge(23);
            father.setSex("man");
            List<Person> children=new ArrayList<Person>();
            for (int i = 8; i < 10; i++) { 
                Person child = new Person();
                if (i % 2 == 0) {
                    child.setSex("man");
                    child.setName("mary" + (i - 7));
                } else {
                    child.setSex("fatel");
                    child.setName("simon" + (i - 7));
                }
                child.setAge(i);
                children.add(child);
            }
            father.setChildren(children);
            /* Export data to a YAML file. */
            File dumpFile = new File(System.getProperty("user.dir") + "/test/src/main/conf/testYaml.yaml");
    
            try {
                Yaml.dump(father, dumpFile);
            } catch (FileNotFoundException e) {
                e.printStackTrace();
            }
        }
    
        //读取yaml配置文件
        @Test
        public  void  read() throws FileNotFoundException {
            File dumpFile=new File(System.getProperty("user.dir") + "/test/src/main/conf/testYaml.yaml");
            Person father = (Person) Yaml.loadType(dumpFile, Person.class);
            StringBuilder stringBuilder=new StringBuilder();
            stringBuilder.append(father.getName())
                    .append("\t")
                    .append(father.getSex())
                    .append("\t")
                    .append(father.getAge())
                    .append("\t")
                    .append(father.getChildren().size());
            System.out.println(stringBuilder.toString());
    
        }
    }

Map结构的yaml文件

JDBC.driver: com.mysql.jdbc.Driver
    JDBC.url: "jdbc:mysql://127.0.0.1:3306/shipping_local?autoReconnect=true&autoReconnectForPools=true&useUnicode=true&characterEncoding=utf8"
    JDBC.username: shipping
    JDBC.password: shipping
    JDBC.autoCommit: false

读取Map结构

//读取yaml配置文件Map结构
        @Test
        public  void  read2() throws FileNotFoundException {
            File dumpFile=new File(System.getProperty("user.dir") + "/test/src/main/conf/testYaml.yaml");
            Map father =Yaml.loadType(dumpFile, HashMap.class);
            for(Object key:father.keySet()){
                System.out.println(key+":\t"+father.get(key).toString());
            }
        }

打印结果如下：

## ![结果][20160613095505893] ##

提供 Maven pox.xml 作为参考

<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.yaml</groupId>
        <artifactId>test</artifactId>
        <version>1.0-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>test</name>
        <url>http://maven.apache.org</url>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        </properties>
    
        <dependencies>
            <dependency>
                <groupId>org.jyaml</groupId>
                <artifactId>jyaml</artifactId>
                <version>1.3</version>
            </dependency>
            <dependency>
                <groupId>junit</groupId>
                <artifactId>junit</artifactId>
                <version>4.11</version>
                <scope>provided</scope>
            </dependency>
        </dependencies>
    </project>

[20160613095505893]: /images/20220721/c3f94b455d3c415188c4cf153f773b9f.png