Question

我想确保在我的对象上以大写形式解组xml元素内容。

public class SZM {

    String field01;
    @XmlElement(name="field01")
    public void setField01(String value) {this.field01 = value.toUpperCase();}
    public String getField01() {return field01;}

但如何为集合中的每个项目做同样的事情？我希望从xml读取的任何值都是大写的。

@XmlElement
ArrayList<String>collection01;

提前致谢，阿戈斯蒂诺

所有课程，以防万一：

package test.jaxb;

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

@XmlRootElement
public class SZM {
    String field01;
    @XmlElement(name="field01")
    public void setField01(String value) {this.field01 = value.toUpperCase();}
    public String getField01() {return field01;}

    @XmlElement
    ArrayList<String>collection01;

}

Answer 1

您可以使用XmlAdapter来操作String值：

<强> StringCaseAdapter

import javax.xml.bind.annotation.adapters.XmlAdapter;

public class StringCaseAdapter extends XmlAdapter<String, String> {

    @Override
    public String unmarshal(String v) throws Exception {
        return v.toUpperCase();
    }

    @Override
    public String marshal(String v) throws Exception {
        return v.toLowerCase();
    }

}

<强> SZM

您将XmlAdapter引用为：

package test.jaxb;

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

@XmlRootElement
public class SZM {
    String field01;

    @XmlElement(name="field01")
    @XmlJavaTypeAdapter(StringCaseAdapter.class)
    public void setField01(String value) {this.field01 = value;}
    public String getField01() {return field01;}

    @XmlElement
    @XmlJavaTypeAdapter(StringCaseAdapter.class)
    ArrayList<String>collection01;

}

<强> input.xml中

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<szm>
    <collection01>def</collection01>
    <collection01>ghi</collection01>
    <field01>abc</field01>
</szm>

<强>演示

import java.io.File;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

public class Demo {

    public static void main(String[] args) throws Exception {
        JAXBContext jc = JAXBContext.newInstance(SZM.class);

        Unmarshaller unmarshaller = jc.createUnmarshaller();
        SZM szm = (SZM) unmarshaller.unmarshal(new File("input.xml"));

        System.out.println(szm.getField01());
        for(String item : szm.collection01) {
            System.out.println(item);
        }

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

}

<强>输出

ABC
DEF
GHI
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<szm>
    <collection01>def</collection01>
    <collection01>ghi</collection01>
    <field01>abc</field01>
</szm>

jaxb，集合的单项设置器

1 个答案: