Atitit java解析yml文件 以及使用 spel ognl 读取 v4 u77.docx Atitit java解析yml文件 目录 1.1. Springboot use snak

Atitit java解析yml文件 以及使用 spel  ognl 读取 v4  u77.docx

Atitit java解析yml文件

 

 

目录

1.1. Springboot use snakeyaml 1

2. 方式一：snakeyaml 2

2.1. 多文档快的解决 3

2.2. loadall 3

2.3. 问题解决 4

2.4. Code 4

3. 方式二：jyaml 5

 

 

 

 

1. 1. Springboot use snakeyaml

 

package miniCodePrjPkg;

 

import org.checkerframework.checker.units.qual.Speed;//

import org.springframework.expression.EvaluationContext;

import org.springframework.expression.ExpressionParser;

import org.springframework.expression.spel.standard.SpelExpressionParser;

import org.springframework.expression.spel.support.StandardEvaluationContext;

//import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.yaml.snakeyaml.Yaml;

 

import com.google.common.collect.Maps;

 

//@SpringBootApplication

public class YmlUtil {

public static void main(String[] args) {

//Maps.newLinkedHashMap()

  Yaml yaml = new Yaml();

Object ret =  yaml.load(YmlUtil.class.getClassLoader()

            .getResourceAsStream("bootstrap.yml"));

    System.out.println(ret);

    

    

    ExpressionParser parser = new SpelExpressionParser();  

    EvaluationContext context3 = new StandardEvaluationContext();  

    context3.setVariable("map8", ret);  

    Object result3 = new SpelExpressionParser().parseExpression("#map8['spring']['profiles']['active']").getValue(context3);

System.out.println(result3);

    System.out.println("f");

}

 

}

 

1. 方式一：snakeyaml

maven依赖添加

1.  

<dependency>

1.  
2.  

<groupId>org.yaml</groupId>

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2.  

<artifactId>snakeyaml</artifactId>

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2.  

<version>1.10</version>

1.  
2.  

 

1.  

 

 

private static void ymlSingledoc(String ymlString) throws FileNotFoundException {

// ymlString="H:\gitWorkSpace\tomcatx\t.yml";

org.yaml.snakeyaml.Yaml yaml = new org.yaml.snakeyaml.Yaml();

// Object mObject=yaml.load(sonsyefen.class.getResourceAsStream("/test.yml"));

Object mObject = yaml.load(new FileInputStream(ymlString));

System.out.println(JSON.toJSONString(mObject, true));

// TestEntity testEntity =

// yaml.loadAs(sonsyefen.class.getResourceAsStream("/test.yml"),

// TestEntity.class);//如果读入Map,这里可以是Mapj接口,默认实现为LinkedHashMap

}

 

1. 1. 多文档快的解决
   2. loadall

在一个yaml文件中可以存入多组配置并使用loadAll进行读取，多组之间使用三个横杠分开

    @Test

    public void loadall() throws FileNotFoundException {

        Yaml yaml = new Yaml();

        File f = new File("test.yaml");

        Iterable<Object> result = yaml.loadAll(new FileInputStream(f));

        for (Object obj : result) {

            System.out.println(obj.getClass());

            System.out.println(obj);

        }

    }

----test.yaml---

 

1. 1. 问题解决

Exception in thread "main" expected a single document in the stream

 in 'reader', line 1, column 1:

    server:

    ^

but found another document

 in 'reader', line 36, column 1:

    ---

    ^

 

at org.yaml.snakeyaml.composer.Composer.getSingleNode(Composer.java:111)

at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:140)

at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:524)

at org.yaml.snakeyaml.Yaml.load(Yaml.java:452)

at tomcatxpkg.sonsyefen.main(sonsyefen.java:26)

 

多文档快的解决

 

1. 1. Code

H:gitWorkSpace omcatxsrc omcatxpkgsonsyefen.java

多文档快

Map m = YmlUtil.getDoc(ymlString, new Predicate<Map>() {

 

@Override

public boolean test(Map m) {

// can use ognl improve

// Map spring = (Map) t.get("spring");

// if (spring.get("profiles").equals("test"))

// return true;

try {

Object expression = Ognl.parseExpression("spring.profiles");

Object value = Ognl.getValue(expression, m);

if(value==null)

return false;

if(value.equals("test"))

return true;

} catch (OgnlException e) {

    e.printStackTrace();

    //if cont contain this key ,then continue

//throw new RuntimeException(e);

}

return false;

}

});

 

 

 

 

 

// 非根节点取值需要#开头

Object expression = Ognl.parseExpression("spring.datasource");

 

Object value = Ognl.getValue(expression, m); // Ognl.getValue(expression);

System.out.println(value);

 

 

1.   方式二：jyaml

maven依赖添加

1.  

<dependency>

1.  
2.  

<groupId>org.jyaml</groupId>

1.  
2.  

<artifactId>jyaml</artifactId>

1.  
2.  

<version>1.3</version>

1.  
2.  

 

1.  

1.  

 

 

@Test

public void testJyml() {

TestEntity testEntity = null;

try {

testEntity = org.ho.yaml.Yaml.loadType(DemoApplicationTests.class.getResourceAsStream("/test.yml"), TestEntity.class);//如果是读入Map,这里不可以写Ma接口，必须写实现

} catch (FileNotFoundException e) {

e.printStackTrace();

}

System.out.println(testEntity);

 

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

TestEntity{age=418, name='Jack', params={event=what's up, url=http://www.test.com}, favoriteBooks=[Gone with the wind, The Little Prince]}

 

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