主要介绍使用jaxb对xml进行解析, 互转.

jaxb 是相对较多的xml工具, 只需要在javaBean的属性上添加相应注解, 就可以使用工具进行解析. 具体使用过程如下:

1. 编写javaBean并添加注解

使用过程中一般常用@XmlRootElement, @XmlAccessorType, @XmlElement, @XmlAttribute四个注解, 其余使用方式可以再自行深入研究.

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@XmlRootElement: 根元素
@XmlAccessorType: java对象生成xml文件时对java对象属性的访问方式
    属性为XmlAccessType.FIELD 指java所有成员变量
@XmlElement: 子节点, name 可指定节点名
@XmlAttribute: 映射为xml文件的属性, name 可指定属性名

javaBean:

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@Data
@XmlRootElement(name = "alipay")
@XmlAccessorType(XmlAccessType.FIELD)
class AliPayXml {

    @XmlElement(name = "alipay_buyer_login_id" )
    private String buyerLoginId;

    @XmlElement(name = "alipay_buyer_user_id")
    private String buyerUserId;
}
2. 使用 JaxbUtil

JaxbUtil代码

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package com.liuzhihang.tool.xml;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import java.io.StringReader;
import java.io.StringWriter;

/**
 * Jaxb 工具
 *
 * @author liuzhihang
 * @date 2017/11/28 19:13
 */
public class JaxbUtil {

    private static final String CHARTSET = "UTF-8";

    public static String bean2Xml(Object obj) throws JAXBException {
        return bean2Xml(obj, CHARTSET);
    }

    public static String bean2Xml(Object obj, String chartset) throws JAXBException {
        JAXBContext jaxbContext = JAXBContext.newInstance(obj.getClass());
        Marshaller marshaller = jaxbContext.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
        marshaller.setProperty(Marshaller.JAXB_ENCODING, chartset);
        StringWriter writer = new StringWriter();
        marshaller.marshal(obj, writer);
        return writer.getBuffer().toString();
    }

    public static <T> T xml2Bean(String xmlString, Class<T> clazz) throws JAXBException {
        JAXBContext jaxbContext = JAXBContext.newInstance(clazz);
        Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();
        T t = (T) unmarshaller.unmarshal(new StringReader(xmlString));
        return t;
    }
}

3. 测试代码

待测试字符串: xmlStr

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<alipay>
  <alipay_buyer_login_id>176****3035</alipay_buyer_login_id>
  <alipay_buyer_user_id>2088912868994947</alipay_buyer_user_id>
</alipay>

测试代码:

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/**
 * @Description:
 * @Author: liuzhihang
 * @Date: 2017/12/17 23:11
 */
public class JaxbTest {

    public static void main(String[] args) throws JAXBException {
        String aliPayXmlStr = "<alipay>\n" +
                "  <alipay_buyer_login_id>176****3035</alipay_buyer_login_id>\n" +
                "  <alipay_buyer_user_id>2088912868994947</alipay_buyer_user_id>\n" +
                "</alipay>";

        AliPayXml aliPayXml = JaxbUtil.xml2Bean(aliPayXmlStr, AliPayXml.class);
        System.out.println(JSON.toJSONString(aliPayXml));
    }
}

测试结果:

打印的为json格式结果, 可debugger查看. 同样也可以将javaBean转换为xmlStr

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{"buyerLoginId":"176****3035","buyerUserId":"2088912868994947"}