如何使用java代码生成xsd文件？

问题描述

<complexType name="spThread">
        <sequence>
            <element name="SPThreadID" type="int" />
            <element name="durtime" minOccurs="0" default="0">
                <simpleType>
                    <restriction base="int">
                        <minInclusive value="0" />
                    </restriction>
                </simpleType>
            </element>
            <element name="minexecutions" minOccurs="0" default="0">
                <simpleType>
                    <restriction base="int">
                        <minInclusive value="0" />
                    </restriction>
                </simpleType>
            </element>
            <element name="numThreads" type="int" />
            <element name="procedures" type="spm:procedure" minOccurs="1"
                maxOccurs="unbounded" />
        </sequence>
    </complexType>

我想用java代码生成这种类型的.xsd文件..？我该怎么做。？

i want to generate this type of .xsd file using java code..? How can i do that.?

特别是如何生成简单类型元素并对其加限制？

Specially how to generate Simple type elements and put restrictions on it ?

推荐答案

您可以利用现有的 xs，而不是创建自己的简单类型来表示以 0 开头的整数： nonNegativeInteger 类型。我将举例说明。

Instead of creating your own simple type to represent integers starting with 0, you could leverage the existing xs:nonNegativeInteger type. I'll demonstrate with an example.

SpThread

您可以使用 @XmlSchemaType 注释，用于指定应在XML模式中为字段/属性生成的类型。

You can use the @XmlSchemaType annotation to specify what type should be generated in the XML schema for a field/property.

package forum11667335;

import javax.xml.bind.annotation.XmlSchemaType;

public class SpThread {

    private int durTime;

    @XmlSchemaType(name="nonNegativeInteger")
    public int getDurTime() {
        return durTime;
    }

    public void setDurTime(int durTime) {
        this.durTime = durTime;
    }

}

演示

您可以在 JAXBContext 上使用 generateSchema 方法生成XML模式：

You can use the generateSchema method on JAXBContext to generate an XML schema:

package forum11667335;

import java.io.IOException;
import javax.xml.bind.*;
import javax.xml.transform.Result;
import javax.xml.transform.stream.StreamResult;

public class Demo {

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

        jc.generateSchema(new SchemaOutputResolver() {

            @Override
            public Result createOutput(String namespaceUri, String suggestedFileName) throws IOException {
                StreamResult result = new StreamResult(System.out);
                result.setSystemId(suggestedFileName);
                return result;
            }

        });
    }

}

输出

以下是生成的XML架构。

Below is the XML schema that was generated.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xs:schema version="1.0" xmlns:xs="http://www.w3.org/2001/XMLSchema">
  <xs:complexType name="spThread">
    <xs:sequence>
      <xs:element name="durTime" type="xs:nonNegativeInteger"/>
    </xs:sequence>
  </xs:complexType>
</xs:schema>

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