Yml文件的寫入和讀取

Author: Lijb

Email: lijb1121@163.com

導入依賴

<dependency>
    <groupId>org.jyaml</groupId>
    <artifactId>jyaml</artifactId>
    <version>1.3</version>
</dependency>

生成yml文件格式

--- !com.neunn.monitor.web.utils.generates.rulesbean.Generates
groups: !com.neunn.monitor.web.utils.generates.rulesbean.Groups
  name: redis
  rules:
    - !com.neunn.monitor.web.utils.generates.rulesbean.Rules
      alert: redis Down
      annotations: !com.neunn.monitor.web.utils.generates.rulesbean.Annotations
        description: "{{ $labels.instance }} ---- {{ $labels.job }} Down 時間超過5s."
        summary: "Instance{{ $labels.instance }} down"
      expr: redis_up == 0
      fors: 5s
      labels: !com.neunn.monitor.web.utils.generates.rulesbean.Labels
        metricType: 1
        severity: red

Bean

public class Generates {
    private Groups groups;
}

public class Groups {
    private String name;
    private List<Rules> rules;
}

public class Rules {
    private String alert;
    private String expr;
    private String fors;
    private Labels labels;
    private Annotations annotations;
}

public class Labels {
    private String severity;
    private int metricType;
}

public class Annotations {
    private String summary;
    private String description;
}
//省略get/set方法

代碼（demo）

數據時寫死的假數據，yml中的數據是來自數據庫的

本次業務場景：最終返回給調用者的是String字符串

考慮一個請求完成生成臨時文件+讀取文件格式並返回字符串，設計成AOP環繞通知

package com.neunn.monitor.web.utils.generates;

import com.neunn.monitor.web.utils.generates.rulesbean.*;
import org.ho.yaml.Yaml;
import org.junit.Test;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;

/**
 * 動態生成yml文件內容測試
 * [@author](https://my.oschina.net/arthor) lijb
 * [@company](https://my.oschina.net/u/3478402) 東網
 * [@date](https://my.oschina.net/u/2504391) 2019-01-08
 */


public class GenerateYml {
    //寫入yaml配置文件
    [@Test](https://my.oschina.net/azibug)
    public void writeYml() {
         //初始化數據，將來數據是從數據庫查出來的

        //labels
        Labels labels = new Labels();
        labels.setSeverity("red");
        labels.setMetricType(1);

        //annotations
        Annotations annotations = new Annotations();
        annotations.setSummary("Instance{{ $labels.instance }} down");
        annotations.setDescription("{{ $labels.instance }} ---- {{ $labels.job }} Down 時間超過5s.");

        //rules
        Rules rules = new Rules();
        rules.setAlert("redis Down");
        rules.setExpr("redis_up == 0");
        rules.setFors("5s");
        rules.setLabels(labels);
        rules.setAnnotations(annotations);

        List<Rules> rulesList=new ArrayList<>();
        rulesList.add(rules);

        //groups
        Groups groups = new Groups();
        groups.setRules(rulesList);
        groups.setName("redis");
        //Generates
        Generates generates= new Generates();
        generates.setGroups(groups);
        File dumpFile = new File(System.getProperty("user.dir")+"/src/com/neunn/monitor/web/utils/generates/ymlfiles/testYaml.yml");
        try {
            Yaml.dump(generates, dumpFile);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }


    //讀yml文件
    @Test
    public void readYml(){
        File file = new File(System.getProperty("user.dir"), "/src/com/neunn/monitor/web/utils/generates/ymlfiles/testYaml.yml");
        try {
            // 讀取文件內容 (輸入流)
            FileInputStream out = new FileInputStream(file);
            InputStreamReader isr = new InputStreamReader(out);
            int ch = 0;
            StringBuilder stringBuilder = new StringBuilder();
            while ((ch = isr.read()) != -1) {
                stringBuilder.append((char) ch);
            }

            System.out.println(stringBuilder);
        } catch (Exception e) {
            // TODO: handle exception
        }
    }

}

讀到的格式

--- !com.neunn.monitor.web.utils.generates.rulesbean.Generates
groups: !com.neunn.monitor.web.utils.generates.rulesbean.Groups
  name: redis
  rules: 
    - !com.neunn.monitor.web.utils.generates.rulesbean.Rules
      alert: redis Down
      annotations: !com.neunn.monitor.web.utils.generates.rulesbean.Annotations
        description: "{{ $labels.instance }} ---- {{ $labels.job }} Down 時間超過5s."
        summary: "Instance{{ $labels.instance }} down"
      expr: redis_up == 0
      fors: 5s
      labels: !com.neunn.monitor.web.utils.generates.rulesbean.Labels
        metricType: 1
        severity: red