随笔档案

import java.lang.reflect.Array;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.IdentityHashMap;
import java.util.Map;

import org.jdom.Document;
import org.jdom.Element;

public class Driver {
    public static Document serializeObject(Object source) throws Exception {
        return serializeHelper(source, new Document(new Element("serialized")),
                new IdentityHashMap());
    }

    private static Document serializeHelper(Object source, Document target,
            Map table) throws Exception {
        String id = Integer.toString(table.size());
        table.put(source, id);
        Class sourceclass = source.getClass();
        Element oElt = new Element("object");
        oElt.setAttribute("class", sourceclass.getName());
        oElt.setAttribute("id", id);
        target.getRootElement().addContent(oElt);
        if (!sourceclass.isArray()) {
            Field[] fields = Mopex.getInstanceVariables(sourceclass);
            for (int i = 0; i < fields.length; i++) {
                if (!Modifier.isPublic(fields[i].getModifiers()))
                    fields[i].setAccessible(true);
                Element fElt = new Element("field");
                fElt.setAttribute("name", fields[i].getName());
                Class declClass = fields[i].getDeclaringClass();
                fElt.setAttribute("declaringclass", declClass.getName());
                Class fieldtype = fields[i].getType();
                Object child = fields[i].get(source);
                if (Modifier.isTransient(fields[i].getModifiers())) {
                    child = null;
                }
                fElt.addContent(serializeVariable(fieldtype, child, target,
                        table));
                oElt.addContent(fElt);
            }
        } else {
            Class componentType = sourceclass.getComponentType();
            int length = Array.getLength(source);
            oElt.setAttribute("length", Integer.toString(length));
            for (int i = 0; i < length; i++) {
                oElt.addContent(serializeVariable(componentType, Array.get(
                        source, i), target, table));
            }
        }
        return target;
    }

    private static Element serializeVariable(Class fieldtype, Object child,
            Document target, Map table) throws Exception {
        if (child == null) {
            return new Element("null");
        } else if (!fieldtype.isPrimitive()) {
            Element reference = new Element("reference");
            if (table.containsKey(child)) {
                reference.setText(table.get(child).toString());
            } else {
                reference.setText(Integer.toString(table.size()));
                serializeHelper(child, target, table);
            }
            return reference;
        } else {
            Element value = new Element("value");
            value.setText(child.toString());
            return value;
        }
    }
}

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import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.LinkedList;
import java.util.List;

public class Mopex {
    public static Method getSupportedMethod(Class cls, String name,
            Class[] paramTypes) throws NoSuchMethodException {
        if (cls == null) {
            throw new NoSuchMethodException();
        }
        try {
            return cls.getDeclaredMethod(name, paramTypes);
        } catch (NoSuchMethodException ex) {
            return getSupportedMethod(cls.getSuperclass(), name, paramTypes);
        }
    }

    public static Field[] getInstanceVariables(Class cls) {
        List accum = new LinkedList();
        while (cls != null) {
            Field[] fields = cls.getDeclaredFields();
            for (int i = 0; i < fields.length; i++) {
                if (!Modifier.isStatic(fields[i].getModifiers())) {
                    if (!Modifier.isPublic(fields[i].getModifiers()))
                        fields[i].setAccessible(true);
                    accum.add(fields[i]);
                }
            }
            cls = cls.getSuperclass();
        }
        Field[] retvalue = new Field[accum.size()];
        return (Field[]) accum.toArray(retvalue);
    }
}

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public class Animal {
    private String name;
    private String gender;
    private String classification;
    private int weight;
    public Animal(String name,String gender, String classification,  int weight) {
        super();
        this.classification = classification;
        this.gender = gender;
        this.name = name;
        this.weight = weight;
    }

}

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import java.util.ArrayList;
import java.util.List;

public class Zoo {
    private String city;

    private String name;

    public Zoo(String name, String city) {

        this.city = city;
        this.name = name;
    }

    List animals = new ArrayList();

    public void add(Animal panda1) {
        animals.add(animals);
    }

}
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import org.jdom.Document;
import org.jdom.output.XMLOutputter;

public class ZooTest {
    public static void main(String[] args) {
        Animal panda1 = new Animal("Tian Tian", "male",
                "Ailuropoda melanoleuca", 271);
        Animal panda2 = new Animal("Mei Xiang", "female",
                "Ailuropoda melanoleuca", 221);
        Zoo national = new Zoo("National Zoological Park", "Washington, D.C.");
        national.add(panda1);
        national.add(panda2);
        try {
            XMLOutputter out = new XMLOutputter();
            Document d = Driver.serializeObject(national);
            out.output(d, System.out);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
}