Question

我正在尝试使用表名，行计数和列列表向XML输出表bean。如果我像属性一样注释它们，它们会显示：所以这个定义：

@XmlRootElement(name = "table")
public class Table {

    private String tableName;
    private int rowCount;
    private List<Column> columnList;

    @XmlAttribute(name = "name")
    public String getTableName() {
        return tableName;
    }

    @XmlAttribute(name = "rowCount")
    public int getRowCount() {
        return rowCount;
    }

    @XmlElement(name = "column")
    public List<Column> getColumnList() {
        return columnList;
    }

}

输出：

    <tables>
     <table name="GGS_MARKER" rowCount="19190">
     <column>
      <columnName>MARKER_TEXT</columnName>
      <datatype>VARCHAR2</datatype>
      <length>4000.0</length>
     </column>
...

但如果我用@XmlElement更改@XmlAttribute，它只显示：

    <tables>
     <table>
     <column>
      <columnName>MARKER_TEXT</columnName>
      <datatype>VARCHAR2</datatype>
      <length>4000.0</length>
     </column>
...

我应该在课堂上怎样才能获得＆＃34; name＆＃34;和＆＃34; rowcount＆＃34;作为元素？

Answer 1

您在示例中需要做的就是将@XmlAttribute更改为@XmlElement。如果您的帖子中只有get方法而非set方法，则需要明确添加@XmlElement注释，因为默认情况下不会应用此用例（按默认情况下，假定所有未映射的属性都具有@XmlElement注释。

表格

package forum10794522; import java.util.*; import javax.xml.bind.annotation.*; @XmlRootElement(name = "table") public class Table { static Table EXAMPLE_TABLE; static { EXAMPLE_TABLE = new Table(); EXAMPLE_TABLE.tableName = "GGS_MARKER"; EXAMPLE_TABLE.rowCount = 19190; List<Column> columns = new ArrayList<Column>(2); columns.add(new Column()); columns.add(new Column()); EXAMPLE_TABLE.columnList = columns; } private String tableName; private int rowCount; private List<Column> columnList; @XmlElement(name = "name") public String getTableName() { return tableName; } @XmlElement(name = "rowCount") public int getRowCount() { return rowCount; } @XmlElement(name = "column") public List<Column> getColumnList() { return columnList; } }

<强>演示

package forum10794522; import javax.xml.bind.*; public class Demo { public static void main(String[] args) throws Exception { JAXBContext jc = JAXBContext.newInstance(Table.class); Marshaller marshaller = jc.createMarshaller(); marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true); marshaller.marshal(Table.EXAMPLE_TABLE, System.out); } }

<强>输出

<?xml version="1.0" encoding="UTF-8" standalone="yes"?> <table> <column/> <column/> <rowCount>19190</rowCount> <name>GGS_MARKER</name> </table>

元素未显示使用JAXB

1 个答案: