JYaml——>Yaml的Java實現

JYaml支持的數據類型：

• 原始數據類型和封裝類（int,java.lang.Integer）
• JavaBean兼容對象（結構支持）
• collection(sequence支持)
  • List
  • Set
• Map（map支持）
• Arrays（sequence支持）
• BigInteger和BigDecimal
• Date

JYaml實例：
將Java實體類寫入yaml文件

//創建實體類
package com.richfit.example;

import java.util.List;

public class General {
    private String name;
    private String address;
    private List<String> family;
    //省略getter和setter
}

package com.richfit.example;

import org.ho.yaml.Yaml;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;

public class demo {

    //為實體類賦值
    public static General set(){
        General general=new General();
        general.setName("許褚");
        general.setAddress("安徽亳州");
        List<String> family=new ArrayList<String>();
        family.add("父親");
        family.add("母親");
        general.setFamily(family);
        return general;
    }
    
    //將實體類直接寫入yaml文件
    public static void main(String[] args) {
        File dumpfile = new File("E:\\workspace_java\\JYaml\\src\\com\\richfit\\example\\general_dump.yaml");
        General general=set();
        try {
            Yaml.dump(general, dumpfile);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}

效果如下：

--- !com.richfit.example.General
address: 安徽亳州
family: 
  - 父親
  - 母親
name: 許褚

將yaml文件load到pojo

package com.richfit.example;
import org.ho.yaml.Yaml;
import java.io.File;
import java.io.FileNotFoundException;
public class Load {
    public static void main(String[] args) {
        General general= new General();
        try {
            general = (General) Yaml.load(new File("E:\\workspace_java\\JYaml\\src\\com\\richfit\\example\\general_dump.yaml"));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
        System.out.println(general.getName()+" "+general.getAddress()+" "+general.getFamily());
    }
}

注意：
JYaml來自如下依賴：

<!-- https://mvnrepository.com/artifact/org.jyaml/jyaml -->
<dependency>
    <groupId>org.jyaml</groupId>
    <artifactId>jyaml</artifactId>
    <version>1.3</version>
</dependency>

可能會出現發自動導入依賴的jar包，可以下載jar包自行導入。

流處理

package com.richfit.example;

import org.ho.yaml.Yaml;
import org.ho.yaml.YamlEncoder;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;

public class Flow {
    public static void main(String[] args) {
        File dumpfile=new File("E:\\workspace_java\\JYaml\\src\\com\\richfit\\example\\general_dump.yaml");
        File dumpfile1=new File("E:\\workspace_java\\JYaml\\src\\com\\richfit\\example\\general1_dump.yaml");
        try {
            General general=(General) Yaml.loadType(dumpfile,General.class);
            YamlEncoder encoder=new YamlEncoder(new FileOutputStream(dumpfile1));
            for (int i=0;i<3;i++){
                general.setName(general.getName()+i);
                encoder.writeObject(general);
                encoder.flush();
            }
            encoder.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }
}

mongodb->pojo->yaml

public void read1(String name) {
        Query query = new Query(Criteria.where("name").is(name));//條件查詢
        List<Book> books = this.mongoTemplate.find(query, Book.class);
        File dumpfile = new File("E:\\workspace_java\\JYaml\\src\\main\\java\\com\\richfit\\modules\\mongo\\test\\book.yaml");
        try {
            for (Book book : books) {
                Yaml.dump(book, dumpfile);
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }