使用XStream完成XML与对象的互转

asfx站长

2021.04.10 17:13:38 阅读 908

maven依赖
```
<dependency>
	<groupId>com.thoughtworks.xstream</groupId>
	<artifactId>xstream</artifactId>
	<version>1.3.1</version>
</dependency>
```
XStreamUtil.java
```
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.mapper.MapperWrapper;

/**
 * @Description XStream 工具类
 */
public class XStreamUtil {

/**
     * 将bean转换为xml
     * @param obj 转换的bean
     * @return bean转换为xml
     */
    public static String objectToXml(Object obj) {
        XStream xStream = new XStream();
//        XStream xStream = new XStream(new XppDriver(new XmlFriendlyNameCoder("_-", "_"))); // 解决下划线问题(定义别名中的下划线“_”转换为xml后会变成“__”这个符号)
        //xstream使用注解转换
        xStream.processAnnotations(obj.getClass());
        xStream.autodetectAnnotations(true);    // 开启注解扫描
        xStream.aliasSystemAttribute(null, "class"); // 去掉 class 属性
        return xStream.toXML(obj);
    }

/**
     * 将xml转换为bean
     * @param <T> 泛型
     * @param xml 要转换为bean的xml
     * @param cls bean对应的Class
     * @return xml转换为bean
     */
    public static <T> T xmlToObject(String xml, Class<T> cls) {
//        XStream xstream = new XStream(new DomDriver());
        XStream xstream = new XStream() {
            @Override
            protected MapperWrapper wrapMapper(MapperWrapper next) {
                return new MapperWrapper(next) {
                    @Override
                    public boolean shouldSerializeMember(Class definedIn, String fieldName) {
                        if (definedIn == Object.class) {
                            return false;
                        }
                        return super.shouldSerializeMember(definedIn, fieldName);
                    }
                };
            }
        };
        //xstream使用注解转换
        xstream.processAnnotations(cls);
        return (T) xstream.fromXML(xml);
    }
}
```
定义Bean对象，假设为AA.java
```
import com.thoughtworks.xstream.annotations.XStreamAlias;
import lombok.Data;

/**
 * AA对象
 */
@Data
@XStreamAlias("BizContent")
public class AA {

/**
	 * 城市编码
	 */
    @XStreamAlias("CityCode")
    private String cityCode;

/**
     * 城市名称
     */
    @XStreamAlias("CityName")
    private String cityName;
}
```
测试用例
```
public class Test {
    public static void main(String[] args) {
        String xml = "<BizContent><CityCode>123</CityCode><CityName>城市名称</CityName></BizContent>";
        AA aa = XStreamUtil.xmlToObject(xml, AA.class);
        System.out.println(aa);
        String toXml = XStreamUtil.objectToXml(aa);
        System.out.println(toXml);
    }
}
```