Question

您好我正在使用faster-xml（https://github.com/FasterXML/jackson-dataformat-xml/wiki）将java POJO对象序列化为xml。当我这样做时，我得到了xml，但它在xml文件中没有任何版本和编码。这是格式我需要

<?xml version="1.0" encoding="utf-8"?>
<SampleRequest>
... 
</SampleRequest>

但我只得到了这一个

<SampleRequest>
... 
</SampleRequest>

是否需要在jackson fasterxml anotation中添加任何配置。

Answer 1

您可以配置XmlMapper xmlMapper = new XmlMapper(); xmlMapper.configure( ToXmlGenerator.Feature.WRITE_XML_DECLARATION, true );以编写XML标头。

import com.fasterxml.jackson.dataformat.xml.XmlMapper;
import com.fasterxml.jackson.dataformat.xml.ser.ToXmlGenerator;
import java.io.IOException;

public class Xml {
    public static void main(String[] args) throws IOException {
        // Important: create XmlMapper; it will use proper factories, workarounds
        XmlMapper xmlMapper = new XmlMapper();
        xmlMapper.configure(ToXmlGenerator.Feature.WRITE_XML_DECLARATION, true);
        xmlMapper.writeValue(System.out, new SampleRequest());
    }
}

class SampleRequest{
    public int x = 1;
    public int y = 2;
}

举个例子：

<?xml version="1.0" encoding="UTF-8"?>
<SampleRequest>
   ...
</SampleRequest>

这会生成输出：

ToXmlGenerator.Feature.WRITE_XML_1_1

如果您想将版本设置为 1.1 而不是 1.0 ，请使用{{1}}。

Answer 2

<div class="square"> <img class="square__img" src="square.png"> </div>
<div class="square square--small"> <img class="square__image" src="square.png"> </div>

Answer 3

对于那些想知道如何将单引号更改为双引号的人：

String propName = com.ctc.wstx.api.WstxOutputProperties.P_USE_DOUBLE_QUOTES_IN_XML_DECL;
xmlMapper.getFactory()
         .getXMLOutputFactory()
         .setProperty(propName, true);

FasterXML jackson-dataformat-xml序列化版本和编码未添加到xml

3 个答案: