解析YAML用JAVA

Question

YAML空間名稱是

innings: 
    - 1st innings: 
     team: Australia 
     runs:500 
    - 2nd innings: 
     team: Australia 
     runs:501 

Java代碼：

import java.io.File; 
import java.util.List; 

import org.apache.commons.lang3.builder.ReflectionToStringBuilder; 
import org.apache.commons.lang3.builder.ToStringStyle; 

import com.fasterxml.jackson.databind.ObjectMapper; 
import com.fasterxml.jackson.dataformat.yaml.YAMLFactory; 

/** 
* Hello world! 
* 
*/ 
public class App { 
    public static void main(String[] args) throws Exception { 
     ObjectMapper mapper = new ObjectMapper(new YAMLFactory()); 
     try { 
      Innings user = mapper.readValue(new File("a.txt"), Innings.class); 
      System.out.println(ReflectionToStringBuilder.toString(user,ToStringStyle.MULTI_LINE_STYLE)); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
} 

class Innings { 
    public List<Inning> innings;  
} 
class Inning{ 
    public int runs; 
    public String team; 
} 

錯誤追蹤： com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException：無法識別的領域「第1局（inning）「，沒有標記爲可忽略的（2個已知屬性：，」runs「，」team「]） at [Source：a.txt;行：3，欄：7]（通過參考鏈：局[[局]] - >局[[第一局]]）

注意：請建議其他解析器，如果傑克遜無法幫助這裏。

Answer 1

得到它使用自定義解串器。謝謝大家。

import java.io.File; 
import java.io.IOException; 
import java.util.List; 

import org.apache.commons.lang3.builder.ReflectionToStringBuilder; 
import org.apache.commons.lang3.builder.ToStringStyle; 

import com.fasterxml.jackson.core.JsonParser; 
import com.fasterxml.jackson.core.JsonProcessingException; 
import com.fasterxml.jackson.databind.DeserializationContext; 
import com.fasterxml.jackson.databind.JsonNode; 
import com.fasterxml.jackson.databind.ObjectMapper; 
import com.fasterxml.jackson.databind.deser.std.StdDeserializer; 
import com.fasterxml.jackson.databind.module.SimpleModule; 
import com.fasterxml.jackson.dataformat.yaml.YAMLFactory; 

public class InningsParse { 
    public static void main(String[] args) { 
     ObjectMapper mapper = new ObjectMapper(new YAMLFactory()); 
     SimpleModule module = new SimpleModule(); 
     module.addDeserializer(Inning.class, new InningDeserializer()); 
     mapper.registerModule(module); 
     try { 
      Innings user = mapper.readValue(new File("a.txt"), Innings.class); 
      System.out.println(ReflectionToStringBuilder.toString(user,ToStringStyle.MULTI_LINE_STYLE)); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 
} 
class Innings { 
    public List<Inning> innings; 
} 
class Inning{ 
    public int runs; 
    public String team; 
} 
class InningDeserializer extends StdDeserializer<Inning> { 

    public InningDeserializer() { 
     this(null); 
    } 

    public InningDeserializer(Class<?> vc) { 
     super(vc); 
    } 

    @Override 
    public Inning deserialize(JsonParser jp, DeserializationContext ctxt) 
     throws IOException, JsonProcessingException { 
     JsonNode node = jp.getCodec().readTree(jp); 
     String nodeS = node.toString(); 
     nodeS = nodeS.substring(nodeS.indexOf(':')+1, nodeS.toString().lastIndexOf('}')); 
     System.out.println(nodeS); 
     ObjectMapper mapper = new ObjectMapper(); 
     return mapper.readValue(nodeS,Inning.class); 
    } 
} 

Answer 2

我不是超級熟悉的YAMLFactory但如果我修改這樣你的POJO：

class innings { 
    public inning[] innings; 
} 
class inning { 
    @JsonProperty("1st innings") 
    public inning_deep first; 

    @JsonProperty("2nd innings") 
    public inning_deep second; 
} 
class inning_deep{ 
    public int runs; 
    public String team; 
} 

它似乎反序列化就OK，但很明顯，這可能是不夠的，你。如果這是JSON，我會用數組替換兩個inning_deep屬性，它會工作得很好。我認爲這是YAMLFactory中的一個限制，您可能需要編寫一個自定義解串器。

你可能會打開一個問題here得到更多的幫助。 請重新考慮班級命名，以尊重naming conventions。

注：通常我不會嘗試發佈一個不完整的答案，但它並不像其他任何人知道如何解決它。