Question

我正在尝试使用Java中的SnakeYaml解析YAML文件，我正在努力使它通过setter构建我的模型对象。我从SnakeYaml文档中理解的是，当您使用遵循JavaBean规则的对象时，SnakeYaml使用反射来查找setter并使用它们来实现成员。

我将代码缩减到以下简约版本，但它仍然无法正常工作：

这是我的模型对象：

public class Report {

    private String MainSourceFile;

    public Report() {
        super();
    }

    public String getMainSourceFile() {
        return this.MainSourceFile;
    }

    public void setMainSourceFile(String mainSourceFile) {
        this.MainSourceFile = mainSourceFile;
    }
}

这是解析YAML文件的代码：

Constructor constructor = new Constructor(Report.class);

Yaml yaml = new Yaml(constructor);
Report report = null;

try (InputStream str = new FileInputStream(file);) {
    report = (Report) yaml.load(str);
} catch (FileNotFoundException e) {
    throw new ParsingErrorException( String.format("Error while reading export file %s : file not found", file.getAbsolutePath()), e);
} catch (YAMLException e) {
    throw new ParsingErrorException(String.format("Error while parsing export file %s", file.getAbsolutePath()), e);
} catch (IOException e1) {
    Activator.logWarning(String.format("Error while closing file %s", file.getAbsolutePath()));
}

这是YAML文件：

---
MainSourceFile:  /home/user/workspace/project/ex.c

抛出以下错误

Unable to find property 'MainSourceFile' on class: fr.xxx.xxx.model.Report
 in 'reader', line 2, column 18:
    MainSourceFile:  /home/user/workspace/project/ex.c
                     ^

    at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:268)
    at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.construct(Constructor.java:149)
    at org.yaml.snakeyaml.constructor.Constructor$ConstructYamlObject.construct(Constructor.java:308)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObjectNoCheck(BaseConstructor.java:207)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructObject(BaseConstructor.java:196)
    at org.yaml.snakeyaml.constructor.BaseConstructor.constructDocument(BaseConstructor.java:161)
    at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:147)
    at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:524)
    at org.yaml.snakeyaml.Yaml.load(Yaml.java:452)
    at fr.xxx.xxx.ErrorParser.parseFixesExportFile(ErrorParser.java:116)
    ... 24 more
Caused by: org.yaml.snakeyaml.error.YAMLException: Unable to find property 'MainSourceFile' on class: fr.xxx.xxx.model.Report
    at org.yaml.snakeyaml.introspector.PropertyUtils.getProperty(PropertyUtils.java:189)
    at org.yaml.snakeyaml.introspector.PropertyUtils.getProperty(PropertyUtils.java:178)
    at org.yaml.snakeyaml.TypeDescription.discoverProperty(TypeDescription.java:240)
    at org.yaml.snakeyaml.TypeDescription.getProperty(TypeDescription.java:251)
    at org.yaml.snakeyaml.constructor.Constructor$ConstructMapping.constructJavaBean2ndStep(Constructor.java:210)
    ... 33 more

如果我将MainSourceFile成员声明为public，则解析有效（这就是为什么它以大写字母开头）。但我不想让它public，而且我想使用setter。我不明白为什么它不使用setter：我的Report类对我来说似乎是一个合法的JavaBean。

还有什么我遗失的吗？

Answer 1

MainSourceFile应该是mainSourceFile。

SnakeYaml没有使用我的二传手

1 个答案: