JAXB 嵌套 XML - 列表 <Object> 具有相同名称的属性：无法显示 XML 数据

Question

我有一个 xml 看起来像这样

<?xml version="1.0" encoding="UTF-8"?>
<TestCases>
  <TestCase id="TC04">
    <statement sequence="1">This is TC04, statement 1</statement>
    <statement sequence="2">This is TC04, statement 2</statement>
    <statement sequence="3">This is TC04, statement 3</statement>
    <statement sequence="4">This is TC04, statement 4</statement>
  </TestCase>
  <TestCase id="TC05">
    <statement sequence="1">This is TC05, statement 1</statement>
    <statement sequence="2">This is TC05, statement 2</statement>
    <statement sequence="3">This is TC05, statement 3</statement>
    <statement sequence="4">This is TC05, statement 4</statement>
  </TestCase>
</TestCases>

至此，我可以获取到TestCases下的所有TestCase，并显示序号。

TC04 1=空，2=空，3=空，4=空 TC05 1=空，2=空，3=空，4=空

但是，在显示值时，我得到的是空值。我认为这需要一个 XMLAdapter 但我不熟悉也无法理解如何创建一个 reads/stores 语句节点的属性和 xml 数据的适配器。

下面是我的 Java 代码。

package Test;

import java.io.File;
import java.util.ArrayList;
import java.util.List;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlAttribute;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "TestCases")
public class TestCases {

    @XmlElement(name = "TestCase")
    private List<TestCase> testcases;

    public List<TestCase> getTestCases() {
        if (this.testcases == null)
            this.testcases = new ArrayList<TestCase>();
        return testcases;
    }

    @XmlRootElement(name = "TestCase")
    public static class TestCase {

        @XmlAttribute(name = "id")
        private String id;

        public String getId() {
            return this.id;
        }

        @XmlElement(name = "statement")
        public List<Statement> statements;

        public List<Statement> getStatements() {
            if (this.statements == null)
                this.statements = new ArrayList<Statement>();
            return statements;
        }

        @XmlRootElement(name = "statement")
        public static class Statement {
            private String name;

            @XmlAttribute(name = "sequence")
            private String sequence;

            public String getSequence() {
                return this.sequence;
            }

            public String getStatement() {
                return this.name;
            }
        }

    }
}

Answer 1

您应该只在 TestCases 上使用 @XmlRootElement。

您可能还需要在 name 上使用 @XmlValue 然后添加 @XmlAccessorType(XmlAccessType.FIELD) 在你的 class 上。 This post 可能会有帮助。

@XmlRootElement(name = "TestCases")
public class TestCases {

    @XmlElement(name = "TestCase")
    private List<TestCase> testcases;

    public List<TestCase> getTestCases() {
        if (this.testcases == null)
            this.testcases = new ArrayList<TestCase>();
        return testcases;
    }

    public static class TestCase {

        @XmlAttribute(name = "id")
        private String id;

        public String getId() {
            return this.id;
        }

        @XmlElement(name = "statement")
        public List<Statement> statements;

        public List<Statement> getStatements() {
            if (this.statements == null)
                this.statements = new ArrayList<Statement>();
            return statements;
        }

        @XmlAccessorType(XmlAccessType.FIELD)
        public static class Statement {
            @XmlValue
            private String name;

            @XmlAttribute(name = "sequence")
            private String sequence;

            public String getSequence() {
                return this.sequence;
            }

            public String getStatement() {
                return this.name;
            }
        }

    }
}

JAXB 嵌套 XML - 列表 <Object> 具有相同名称的属性：无法显示 XML 数据

JAXB Nested XML - List<Object> same names with attributes: unable to display XML data

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