（javax）javaBean转xml

来源：互联网发布：nba2k16捏脸中国人数据编辑：程序博客网时间：2024/06/05 19:12

一般与第三方公司进行交互时，经常会用到xml报文，生成xml的方式有多种，以前用map转xml，后来发现，在实际工作中，会有很多局限性。

后来改用javaBean转xml，觉得还挺方便的，下面上一下案例代码：

场景一：

该场景是生成（非多层级）xml

javaBean类：

package test.javabeantoxml;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "xml")
@XmlType(propOrder = { "amount"})
public class MOUNT {
   @XmlElement
   private String amount;

   public String getAmount() {
       return amount;
   }

   public void setAmount(String amount) {
       this.amount = amount;
   }

}

期望结果：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xml>
<amount>1</amount>
</xml>

实现代码：

public class TEST {
public static void main(String[] args) {

              MOUNT mount = new MOUNT();
             mount.setAmount("1");
       String xmlstr = convertToXml(mount,"UTF-8");

System.out.println(xmlstr);

}

    /**
     * xml转换成JavaBean
     * @param xml
     * @param c
     * @return
     */
     @SuppressWarnings("unchecked")
     public static <T> T converyToJavaBean(String xml, Class<T> c) {
           T t = null;
            try {
                JAXBContext context = JAXBContext.newInstance(c);
                Unmarshaller unmarshaller = context.createUnmarshaller();
                t = (T) unmarshaller.unmarshal(new StringReader(xml));
            } catch (Exception e) {
                e.printStackTrace();
            }

            return t;
        }

}

运行后就得到想要的结果咯。。。。

不过往往在工作中，没有那么简单地需求，很多时候，是需要生成包含list的xml报文。那该怎么办呢？

场景二：

生成多层级（list类型）xml

javabean一：

import java.util.List;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlElementWrapper;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlRootElement(name = "xml")
@XmlType(propOrder = { "amount","addrList"})
public class MOUNT {
   @XmlElement
   private String amount;

   public String getAmount() {
       return amount;
   }

   public void setAmount(String amount) {
       this.amount = amount;
   }

   @XmlElementWrapper(name="addrs")//指定父节点
   @XmlElement(name = "addr")
   private List<ADDR> addrList;

   public List<ADDR> getAddrList() {
       return addrList;
   }

   public void setAddrList(List<ADDR> addrList) {
       this.addrList = addrList;
   }

}

javabean二：

import javax.xml.bind.annotation.XmlType;

@XmlType(propOrder = { "prov","contry"})
public class ADDR{
   @BeanPropertyCheck(require = true, zh = "省份")
   private String prov;
   @BeanPropertyCheck(require = true, zh = "市")
   private String contry;
   public String getProv() {
       return prov;
   }
   public void setProv(String prov) {
       this.prov = prov;
   }
   public String getContry() {
       return contry;
   }
   public void setContry(String contry) {
       this.contry = contry;
   }

   @Override
   public String toString(){
       return "{prov=" + prov + ",contry=" + contry +"}";
   }
}

期望结果：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<xml>
    <amount>1</amount>
    <addrs>
        <addr>
            <prov>江苏</prov>
            <contry>南京</contry>
        </addr>
        <addr>
            <prov>江苏</prov>
            <contry>淮安</contry>
        </addr>
    </addrs>
</xml>

实现案例：

public class TEST {
public static void main(String[] args) {

        MOUNT mount = new MOUNT();
       mount.setAmount("1");
       List<ADDR> addrList = new ArrayList<ADDR>();
       ADDR addr = new ADDR();
       addr.setProv("江苏");
       addr.setContry("南京");
       addrList.add(addr);

       ADDR addr2 = new ADDR();
       addr2.setProv("江苏");
       addr2.setContry("淮安");
       addrList.add(addr2);
       mount.setAddrList(addrList);

       String xmlstr = convertToXml(mount,"UTF-8");
       System.out.println(xmlstr);

}

    /**
     * JavaBean转换成xml
     * @param obj
     * @param encoding
     * @return
     */
    public static String convertToXml(Object obj, String encoding) {
       String result = null;
       try {
           JAXBContext context = JAXBContext.newInstance(obj.getClass());
           Marshaller marshaller = context.createMarshaller();
           marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
           marshaller.setProperty(Marshaller.JAXB_ENCODING, encoding);
           StringWriter writer = new StringWriter();
           marshaller.marshal(obj, writer);
           result = writer.toString();
       } catch (Exception e) {
           e.printStackTrace();
       }
           return result;
       }

}

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