JAVA XStream的使用

Posted 2020-10-31 恒磊国际

MAVN包：

<dependency>
   <groupId>com.thoughtworks.xstream</groupId>
   <artifactId>xstream</artifactId>
   <version>1.4.9</version>
</dependency>

过滤不能识别的节点

package common;

import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.mapper.MapperWrapper;

public class ETLXstream extends XStream {
            /*
             * (non-Javadoc)
             *
             * @see
             * com.thoughtworks.xstream.XStream#wrapMapper
             */
 @Override
 protected MapperWrapper wrapMapper(MapperWrapper next) {
                return new MapperWrapper(next) {
                    /*
                     * (non-Javadoc)
                     *
                     * @see
                     * com.thoughtworks.xstream.mapper.MapperWrapper#shouldSerializeMember
                     */
 @Override
 public boolean shouldSerializeMember(@SuppressWarnings("rawtypes") Class definedIn, String fieldName) {
                        // 不能识别的节点，掠过。
 if (definedIn == Object.class){
                            try {
                                return this.realClass(fieldName) != null;
                            } catch (Exception e){
                                return false;
                            }
                        } else {
                            return super.shouldSerializeMember(definedIn, fieldName);
                        }
                    }
                };
    }
}

XMLHelper封装类

package common;

import java.io.InputStream;
import java.lang.Class;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;

public class XmlHelper {
    public static <T> String ToXml(T object, HashMap<String, Class> map) {
        ETLXstream xstream = getXStream(map);
        for (Entry<String, Class> entry : map.entrySet()) {
            xstream.alias(entry.getKey(), entry.getValue());
        }
        return xstream.toXML(object);
    }

    public static <T> T ToObject(String xml, HashMap<String, Class> map) {
        ETLXstream xstream = getXStream(map);
        T object = (T) xstream.fromXML(xml);
        return object;
    }

    public static <T> T ToObject(InputStream stream, HashMap<String, Class> map) {
        ETLXstream xstream = getXStream(map);
        T object = (T) xstream.fromXML(stream);
        return object;
    }

    private static ETLXstream getXStream(HashMap<String, Class> map) {
        ETLXstream xstream = new ETLXstream();
        for (Entry<String, Class> entry : map.entrySet()) {
            xstream.alias(entry.getKey(), entry.getValue());
        }
        return xstream;
    }
}