Java解析XML到POJO

首先是我们的 XML 文件

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<?xml version="1.0" encoding="UTF-8" ?>
<c c1="0">
<d d1="101280101" d2="广州" d3="guangzhou" d4="广东"/>
<d d1="101280102" d2="番禺" d3="panyu" d4="广东"/>
<d d1="101280103" d2="从化" d3="conghua" d4="广东"/>
<d d1="101280104" d2="增城" d3="zengcheng" d4="广东"/>
<d d1="101280105" d2="花都" d3="huadu" d4="广东"/>
<d d1="101280201" d2="韶关" d3="shaoguan" d4="广东"/>
<d d1="101280202" d2="乳源" d3="ruyuan" d4="广东"/>
<d d1="101280203" d2="始兴" d3="shixing" d4="广东"/>
<d d1="101280204" d2="翁源" d3="wengyuan" d4="广东"/>
<d d1="101280205" d2="乐昌" d3="lechang" d4="广东"/>
<d d1="101280206" d2="仁化" d3="renhua" d4="广东"/>
<d d1="101280207" d2="南雄" d3="nanxiong" d4="广东"/>
<d d1="101280208" d2="新丰" d3="xinfeng" d4="广东"/>
<d d1="101280209" d2="曲江" d3="qujiang" d4="广东"/>
<d d1="101280210" d2="浈江" d3="chengjiang" d4="广东"/>
<d d1="101280211" d2="武江" d3="wujiang" d4="广东"/>
<d d1="101280301" d2="惠州" d3="huizhou" d4="广东"/>
<d d1="101280302" d2="博罗" d3="boluo" d4="广东"/>
<d d1="101280303" d2="惠阳" d3="huiyang" d4="广东"/>
<d d1="101280304" d2="惠东" d3="huidong" d4="广东"/>
<d d1="101280305" d2="龙门" d3="longmen" d4="广东"/>
</c>

定义 VO 对象

City.java
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@Data
@XmlRootElement(name = "d")
@XmlAccessorType(XmlAccessType.FIELD)
public class City {
@XmlAttribute(name = "d1")
private String cityId;
@XmlAttribute(name = "d2")
private String cityName;
@XmlAttribute(name = "d3")
private String cityCode;
@XmlAttribute(name = "d4")
private String province;
}
CityList.java
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@Data
@XmlRootElement(name = "c")
@XmlAccessorType(XmlAccessType.FIELD)
public class CityList {
@XmlElement(name = "d")
private List<City> cityList;
}

XML 转 POJO 的工具类

XmlBuilder.java
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public class XmlBuilder {
/**
* 将 XML 转为指定的 POJO
* @param clazz
* @param xmlStr
* @return
* @throws Exception
*/
public static Object xmlStrToObject(Class<?> clazz, String xmlStr) throws Exception {
Object xmlObject = null;
Reader reader = null;
JAXBContext context = JAXBContext.newInstance(clazz);
// XML 转为对象的接口
Unmarshaller unmarshaller = context.createUnmarshaller();
reader = new StringReader(xmlStr);
xmlObject = unmarshaller.unmarshal(reader);
if (reader != null) {
reader.close();
}
return xmlObject;
}
}

Service 接口与实现

CityDataService.java
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public interface CityDataService {
/**
* 获取城市列表
* @return
* @throws Exception
*/
List<City> listCity() throws Exception;
}

CityDataServiceImpl.java
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public class CityDataServiceImpl implements CityDataService {
public List<City> listCity() throws Exception {
// 读取 XML 文件
Resource resource = new ClassPathResource("citylist.xml");
BufferedReader br = new BufferedReader(new InputStreamReader(resource.getInputStream(), "utf-8"));
StringBuffer buffer = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
buffer.append(line);
}
br.close();
// XML 转为 Java 对象
CityList cityList = (CityList) XmlBuilder.xmlStrToObject(CityList.class, buffer.toString());
return cityList.getCityList();
}
}