解析Xml

定义

做webservice的时候要解析xml，通过查找发现JAXB是可以解析xml并转换成对象的

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name="标签名称", propOrder={属性名称})
@XmlRootElement        
public class OrderRequestMsgHeader {
    /**
      *@XmlElement里面的name跟xml里面节点内的标签对应
      */
    @XmlElement(name="msgHeader", required=true)
    private MsgHeader msgHeader;

    @XmlElement(name="ORDER_CODE", required=true)
    private String orderCode;
    get()/set()
}

MsgHeader类：

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name="msgHeader", propOrder={"USERNAME","PAGESIZE","CURRENT_PAGE"})
@XmlRootElement(name="msgHeader")
public class MsgHeader {
    @XmlElement(name="USERNAME",required = true)
    private String USERNAME;
    @XmlElement(name="PAGESIZE",required = true)
    private String PAGESIZE;
    @XmlElement(name="CURRENT_PAGE",required = true)
    private String CURRENT_PAGE;
    get()/set()
}

数据

这是传过来的xml格式的数据，标签中orderRequestMsgHeader对应的是@XmlType中的name,msgHeader对应的就是@XmlElement中的名称

String xml="<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
                "<orderRequestMsgHeader>\r"+
                "<msgHeader>\r" + 
                "<USERNAME>***有限公司</USERNAME>\r" + 
                "<PAGESIZE>50</PAGESIZE>\r" + 
                "<CURRENT_PAGE>1</CURRENT_PAGE>\r" + 
                "</msgHeader>\r"+
                "<ORDER_CODE>000051</ORDER_CODE>\r" 
                "</orderRequestMsgHeader>";

通过JAXB解析Xml文件

解析

OrderRequestMsgHeader header=new OrderRequestMsgHeader();//要转换未的类信息
            JAXBContext jaxbContext = JAXBContext.newInstance(OrderRequestMsgHeader.class);//创建JAXBContext对象，注意一定要传@XmlRootElement的所标记的类的类型

            Unmarshaller unmarshaller = jaxbContext.createUnmarshaller();//拿到xml解析对象
            StringReader sr = new StringReader(xml);
            header = (OrderRequestMsgHeader)unmarshaller.unmarshal(sr);//转换后的对象信息
            ]

解析后的header：OrderRequestMsgHeader [msgHeader=MsgHeader{ USERNAME='纸业有限公司', SUBMITDATE='2020-01-01 12:12:12', PAGESIZE='50', CURRENT_PAGE='1', }, orderCode=000051