如何将XML转换为Java对象-蒲公英云

如何将XML转换为Java对象

怼烎@ 2021-06-12 15:16 991阅读 0赞

1.首先创建citylist.xml文件，放在resource目录下，文件内容如下：

<?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"/>
</c>

2.创建与xml文件中的元素相对应的Bean，分别是CityList和City。
CityList.java

/**
 * @desc 城市列表
 */
@XmlRootElement(name="c")  //声明为xml的根元素c
@XmlAccessorType(XmlAccessType.FIELD)  //通过字段来访问
public class CityList implements Serializable {
    @XmlElement(name="d") //映射的xml元素
    private List<City> cityList;
    public List<City> getCityList() {
        return cityList;
    }
    public void setCityList(List<City> cityList) {
        this.cityList = cityList;
    }
}

City.java

/**
 * @desc  城市信息 解析citylist.xml获取
 */
@XmlRootElement(name="d")  //声明为xml的根元素d
@XmlAccessorType(XmlAccessType.FIELD)  //通过字段来访问
public class City implements Serializable {
    @XmlAttribute(name="d1") //映射的xml属性
    private String cityId;
    @XmlAttribute(name="d2")
    private String cityName;
    @XmlAttribute(name="d3")
    private String cityCode;
    @XmlAttribute(name="d4")
    private String province;
    public String getCityId() {
        return cityId;
    }
    public void setCityId(String cityId) {
        this.cityId = cityId;
    }
    public String getCityName() {
        return cityName;
    }
    public void setCityName(String cityName) {
        this.cityName = cityName;
    }
    public String getCityCode() {
        return cityCode;
    }
    public void setCityCode(String cityCode) {
        this.cityCode = cityCode;
    }
    public String getProvince() {
        return province;
    }
    public void setProvince(String province) {
        this.province = province;
    }
}

3.读取xml文件，将其内容转换为字符串。

//读取xml文件
Resource resource=new ClassPathResource("citylist.xml");
BufferedReader reader=new BufferedReader(new InputStreamReader(resource.getInputStream(),"utf-8"));
StringBuffer buffer=new StringBuffer();
String line="";
while((line=reader.readLine())!=null){
  buffer.append(line);
}
reader.close();

4.将CityList.class和buffer.toString()传入到以下方法的形参中，实现XML的对象转换。

/**
  * 将XML转为指定的POJO对象
  * @param clazz
  * @param xmlStr
  * @return
  */
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(null!=reader){
    reader.close();
  }
  return xmlObject;
}