javamock生成对象

来源：互联网发布：成捷迅软件破解版编辑：程序博客网时间：2024/06/03 23:43
import java.lang.reflect.Field;import java.lang.reflect.ParameterizedType;import java.util.ArrayList;import java.util.Date;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Random;public class Mock {    private static final Boolean[] bools                 = new Boolean[] { true, false };    private static final char[]    words                 = new char[] { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i',            'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' };    private static final Random    r                     = new Random();    private static final int       MAX_COLLECTION_LENGTH = 50;    private static final int       MAX_STRING_LENGTH     = 30;    @SuppressWarnings({ "unchecked", "rawtypes" })    public static <T> T mock(Class<T> clazz) {        if (clazz == Character.class || clazz == Character.TYPE) {            return (T) (Character) words[r.nextInt(words.length)];        } else if (clazz == Boolean.class || clazz == Boolean.TYPE) {            return (T) (Boolean) bools[r.nextInt(bools.length)];        } else if (clazz == Long.class || clazz == Long.TYPE) {            return (T) (Long) r.nextLong();        } else if (clazz == Integer.class || clazz == Integer.TYPE) {            return (T) (Integer) r.nextInt();        } else if (clazz == Short.class || clazz == Short.TYPE) {            return (T) (Short) new Integer(r.nextInt(127)).shortValue();        } else if (clazz == Float.class || clazz == Float.TYPE) {            return (T) (Float) r.nextFloat();        } else if (clazz == Double.class || clazz == Double.TYPE) {            return (T) (Double) r.nextDouble();        } else if (clazz == String.class) {            return (T) randString(r.nextInt(MAX_STRING_LENGTH));        }        try {            T instance = clazz.newInstance();            for (Field f : ReflectUtil.getFields(clazz)) {                f.setAccessible(true);                Length lengthAnno = f.getAnnotation(Length.class);                if (f.getType() == Character.TYPE) {                    f.setChar(instance, words[r.nextInt(words.length)]);                } else if (f.getType() == Character.class) {                    f.set(instance, words[r.nextInt(words.length)]);                } else if (f.getType() == Boolean.TYPE) {                    f.setBoolean(instance, bools[r.nextInt(bools.length)]);                } else if (f.getType() == Boolean.class) {                    f.set(instance, bools[r.nextInt(bools.length)]);                } else if (f.getType() == Long.TYPE) {                    f.setLong(instance, r.nextLong());                } else if (f.getType() == Long.class) {                    f.set(instance, r.nextLong());                } else if (f.getType() == Integer.TYPE) {                    f.setInt(instance, r.nextInt());                } else if (f.getType() == Integer.class) {                    f.set(instance, r.nextInt());                } else if (f.getType() == Short.TYPE) {                    f.setShort(instance, new Integer(r.nextInt(127)).shortValue());                } else if (f.getType() == Short.class) {                    f.set(instance, new Integer(r.nextInt(127)).shortValue());                } else if (f.getType() == Float.TYPE) {                    f.setFloat(instance, r.nextFloat());                } else if (f.getType() == Float.class) {                    f.set(instance, r.nextFloat());                } else if (f.getType() == Double.TYPE) {                    f.setDouble(instance, r.nextDouble());                } else if (f.getType() == Double.class) {                    f.set(instance, r.nextDouble());                } else if (f.getType() == String.class) {                    f.set(instance, randString(r.nextInt(MAX_STRING_LENGTH)));                } else if (f.getType() == List.class) {                    int size = r.nextInt(MAX_COLLECTION_LENGTH);                    List<Object> list = new ArrayList<Object>(size);                    ParameterizedType pt = null;                    for (int i = 0; i < size; i++) {                        pt = (ParameterizedType) f.getGenericType();                        list.add(mock((Class) pt.getActualTypeArguments()[0]));                    }                    f.set(instance, list);                } else if (f.getType() == Map.class) {                    int size = r.nextInt(MAX_COLLECTION_LENGTH);                    Map<Object, Object> map = new HashMap<Object, Object>();                    ParameterizedType pt = null;                    for (int i = 0; i < size; i++) {                        pt = (ParameterizedType) f.getGenericType();                        map.put(mock((Class) pt.getActualTypeArguments()[0]),                                mock((Class) pt.getActualTypeArguments()[1]));                    }                    f.set(instance, map);                } else if (f.getType() == Date.class) {                    f.set(instance, new Date());                } else {                    f.set(instance, mock(f.getType()));                }            }            return instance;        } catch (Exception e) {            throw new IllegalArgumentException(e);        }    }    private static String randString(int count) {        if (count == 0) {            count = 1;        }        int length = words.length;        char[] text = new char[count];        for (int i = 0; i < count; i++) {            text[i] = words[r.nextInt(length)];        }        return new String(text);    }}
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