如何格式化Json输出 [英] How to format Json output

问题描述

请帮助我如何获取JSON输出，如下所示:

Please help me how to get JSON output as below:

{
   "_costMethod": "Average",
   "fundingDate": 2008-10-02,
   "fundingAmount": 2510959.95
}

代替:

{
   "@type": "sma",
   "costMethod": "Average",
   "fundingDate": "2008-10-02",
   "fundingAmount": "2510959.95"
}

推荐答案

根据问题的输出，您当前未使用

Based on the output from your question, you are currently not using EclipseLink JAXB (MOXy)'s native JSON binding. The following should help.

Java模型

以下是我根据您的帖子对您​​的对象模型的最佳猜测.我已经添加了获取所需的输出所必需的元数据.

Below is my best guess at your object model based on your post. I have added the metadata necessary to get the output that you are looking for.

• @XmlElement批注可用于更改键的名称.
• 我已经使用@XmlSchemaType批注来控制Date属性的格式.

• The @XmlElement annotation can be used to change the name of a key.
• I have used the @XmlSchemaType annotation to control the format of the Date property.

package forum14047050;

import java.util.Date;
import javax.xml.bind.annotation.*;

@XmlType(propOrder={"costMethod", "fundingDate", "fundingAmount"})
public class Sma {

    private String costMethod;
    private Date fundingDate;
    private double fundingAmount;

    @XmlElement(name="_costMethod")
    public String getCostMethod() {
        return costMethod;
    }

    public void setCostMethod(String costMethod) {
        this.costMethod = costMethod;
    }

    @XmlSchemaType(name="date")
    public Date getFundingDate() {
        return fundingDate;
    }

    public void setFundingDate(Date fundingDate) {
        this.fundingDate = fundingDate;
    }

    public double getFundingAmount() {
        return fundingAmount;
    }

    public void setFundingAmount(double fundingAmount) {
        this.fundingAmount = fundingAmount;
    }

}

jaxb.properties

要将MOXy用作JAXB(JSR-222)提供程序，您需要在与域模型相同的程序包中包含一个名为jaxb.properties的文件(请参阅:

To use MOXy as your JAXB (JSR-222) provider you need to include a file called jaxb.properties in the same package as your domain model (see: http://blog.bdoughan.com/2011/05/specifying-eclipselink-moxy-as-your.html).

javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.JAXBContextFactory

演示代码

package forum14047050;

import java.util.*;
import javax.xml.bind.*;
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[] {Sma.class}, properties);

        Sma sma = new Sma();
        sma.setCostMethod("Average");
        sma.setFundingDate(new Date(108, 9, 2));
        sma.setFundingAmount(2510959.95);

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

}

输出

下面是运行演示代码的输出.与您的问题不同，我在日期值周围加了引号.这是使其成为有效JSON所必需的.

Below is the output from running the demo code. Unlike your question I have quotes around the date value. This is required to make it valid JSON.

{
   "_costMethod" : "Average",
   "fundingDate" : "2008-10-02",
   "fundingAmount" : 2510959.95
}

更多信息

• http://blog.bdoughan.com/2011/08/json-binding-with-eclipselink-moxy.html
• http://blog. bdoughan.com/2012/05/moxy-as-your-jax-rs-json-provider.html

• http://blog.bdoughan.com/2011/08/json-binding-with-eclipselink-moxy.html
• http://blog.bdoughan.com/2012/05/moxy-as-your-jax-rs-json-provider.html

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