使用Jackson或其替代方法将JSON树解析为普通类 [英] Parse JSON tree to plain class using Jackson or its alternatives

问题描述

如何解析JSON：

{
    "foo": {
        "bar": {
            "baz": "Hello"
        },
        "qux": "World"
    }
}

使用 Jackson 进入该班级或其替代方案：

Into that class using Jackson or its alternatives:

public class Foo {
    private String baz;
    private String qux;

    public String getBaz() {
        return baz;
    }

    public void setBaz(final String baz) {
        this.baz = baz;
    }

    public String getQux() {
        return qux;
    }

    public void setQux(final String qux) {
        this.qux = qux;
    }
}

期待类似：

Expecting something like:

@JsonProperty("foo.bar.baz")
private String baz;
@JsonProperty("foo.qux")
private String qux;

推荐答案

注意：我' EclipseLink JAXB（MOXy） 负责人及其成员 JAXB（JSR-222） 专家组。

Note: I'm the EclipseLink JAXB (MOXy) lead and a member of the JAXB (JSR-222) expert group.

Jackson可能无法使用此用例，但可以在MOXy用作JSON绑定提供程序时完成。

This use case may not be possible with Jackson, but can be done when MOXy is used as your JSON-binding provider.

Foo

您可以利用MOXy基于路径的映射来处理此用例。

You can take advantage of MOXy's path based mapping for this use case.

import org.eclipse.persistence.oxm.annotations.XmlPath;

public class Foo {

    private String baz;
    private String qux;

    @XmlPath("foo/bar/baz/text()")
    public String getBaz() {
        return baz;
    }

    public void setBaz(final String baz) {
        this.baz = baz;
    }

    @XmlPath("foo/qux/text()")
    public String getQux() {
        return qux;
    }

    public void setQux(final String qux) {
        this.qux = qux;
    }

}

演示

JAXB运行时API用于读/写JSON。

The JAXB runtime APIs are used to read/write the JSON.

import java.util.*;
import javax.xml.bind.*;
import javax.xml.transform.stream.StreamSource;
import org.eclipse.persistence.jaxb.JAXBContextProperties;

public class Demo {

    public static void main(String[] args) throws Exception {
        Map<String, Object> properties = new HashMap<String, Object>(2);
        properties.put(JAXBContextProperties.MEDIA_TYPE, "application/json");
        properties.put(JAXBContextProperties.JSON_INCLUDE_ROOT, false);
        JAXBContext jc = JAXBContext.newInstance(new Class[] {Foo.class}, properties);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        StreamSource json = new StreamSource("src/forum15659950/input.json");
        Foo foo = unmarshaller.unmarshal(json, Foo.class).getValue();

        Marshaller marshaller = jc.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.marshal(foo, System.out);
    }

}

input.json /输出

{
   "foo" : {
      "bar" : {
         "baz" : "Hello"
      },
      "qux" : "World"
   }
}

更多信息

• http://blog.bdoughan.com/2011/05/specifying- eclipselink-moxy-as-your.html


• http://blog.bdoughan.com/2011/08/json-binding-with-eclipselink-moxy.html

• http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html
• http://blog.bdoughan.com/2011/08/json-binding-with-eclipselink-moxy.html

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