如何在Eclipse中列出Java类及其祖先公开的所有属性？

Question

给定一个Java类,我希望能够列出在所有祖先中公开的所有属性,并public以相同的方式递归遍历所有公开的属性(即或使用getter/setter).

用一个简单的例子更容易解释:

public class BaseClass1 {
    private int intProperty; // has getter and setter (not shown)
}
public class SubClass1 extends BaseClass1 {
    private int privateSoNotListed;
    public SubClass2 subClass2Property;
}
public class BaseClass2 {
    public String stringProperty;
}
public class SubClass2 extends BaseClass2 {
    private long longProperty; // has getter and setter (not shown)
}

鉴于SubClass1上面的输入,输出会是这样的:

intProperty                      - int    [from BaseClass1]
subClass2Property.stringProperty - String [from BaseClass2]
subClass2Property.longProperty   - long   [from SubClass2]

应该可以使用一些巧妙的反射来写这样的东西,但我宁愿不重新发明轮子 - 是否有现成的工具可以做到这一点(也许是一个Eclipse插件？)

编辑: Eclipse的类型层次结构可以很好地显示单个类的属性 - 在我看来,理想的解决方案是,如果这是一个树视图(类似于包资源管理器),能够扩展自身类的属性.

Answer 1

另请参阅重复的Recursive BeanUtils.describe(),它也可以递归工作.以下是我们使用的自定义版本(登录log4j记录器):

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.TreeMap;

import org.apache.commons.beanutils.BeanUtilsBean;
import org.apache.commons.beanutils.ConvertUtilsBean;
import org.apache.log4j.Logger;

/*
 * See the original version: https://stackoverflow.com/questions/6133660/recursive-beanutils-describe
 */
public class Inspector  {

    public static void recursivelyDescribeAndLog(Object ob, Logger log){
        log.info(ob.getClass());
        try {
            Map<String, String> props = recursiveDescribe(ob);
            for (Map.Entry<String, String> p : props.entrySet()) {
                log.info(" -> " + p.getKey() + "="+p.getValue());
            }

        } catch (Throwable e) {
            log.error(e.getMessage(), e);
        }
    }

    public static Map<String, String> recursiveDescribe(Object object) {
        Set cache = new HashSet();
        return recursiveDescribe(object, null, cache);
    }

    private static Map<String, String> recursiveDescribe(Object object, String prefix, Set cache) {
        if (object == null || cache.contains(object)) return Collections.EMPTY_MAP;
        cache.add(object);
        prefix = (prefix != null) ? prefix + "." : "";

        Map<String, String> beanMap = new TreeMap<String, String>();

        Map<String, Object> properties = getProperties(object);
        for (String property : properties.keySet()) {
            Object value = properties.get(property);
            try {
                if (value == null) {
                    //ignore nulls
                } else if (Collection.class.isAssignableFrom(value.getClass())) {
                    beanMap.putAll(convertAll((Collection) value, prefix + property, cache));
                } else if (value.getClass().isArray()) {
                    beanMap.putAll(convertAll(Arrays.asList((Object[]) value), prefix + property, cache));
                } else if (Map.class.isAssignableFrom(value.getClass())) {
                    beanMap.putAll(convertMap((Map) value, prefix + property, cache));
                } else {
                    beanMap.putAll(convertObject(value, prefix + property, cache));
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        return beanMap;
    }

    private static Map<String, Object> getProperties(Object object) {
        Map<String, Object> propertyMap = getFields(object);
        //getters take precedence in case of any name collisions
        propertyMap.putAll(getGetterMethods(object));
        return propertyMap;
    }

    private static Map<String, Object> getGetterMethods(Object object) {
        Map<String, Object> result = new HashMap<String, Object>();
        BeanInfo info;
        try {
            info = Introspector.getBeanInfo(object.getClass());
            for (PropertyDescriptor pd : info.getPropertyDescriptors()) {
                Method reader = pd.getReadMethod();
                if (reader != null) {
                    String name = pd.getName();
                    if (!"class".equals(name)) {
                        try {
                            Object value = reader.invoke(object);
                            result.put(name, value);
                        } catch (Exception e) {
                            //you can choose to do something here
                        }
                    }
                }
            }
        } catch (IntrospectionException e) {
            //you can choose to do something here
        } finally {
            return result;
        }

    }

    private static Map<String, Object> getFields(Object object) {
        return getFields(object, object.getClass());
    }

    private static Map<String, Object> getFields(Object object, Class<?> classType) {
        Map<String, Object> result = new HashMap<String, Object>();

        Class superClass = classType.getSuperclass();
        if (superClass != null) result.putAll(getFields(object, superClass));

        //get public fields only
        Field[] fields = classType.getFields();
        for (Field field : fields) {
            try {
                result.put(field.getName(), field.get(object));
            } catch (IllegalAccessException e) {
                //you can choose to do something here
            }
        }
        return result;
    }

    private static Map<String, String> convertAll(Collection<Object> values, String key, Set cache) {
        Map<String, String> valuesMap = new HashMap<String, String>();
        Object[] valArray = values.toArray();
        for (int i = 0; i < valArray.length; i++) {
            Object value = valArray[i];
            if (value != null) valuesMap.putAll(convertObject(value, key + "[" + i + "]", cache));
        }
        return valuesMap;
    }

    private static Map<String, String> convertMap(Map<Object, Object> values, String key, Set cache) {
        Map<String, String> valuesMap = new HashMap<String, String>();
        for (Object thisKey : values.keySet()) {
            Object value = values.get(thisKey);
            if (value != null) valuesMap.putAll(convertObject(value, key + "[" + thisKey + "]", cache));
        }
        return valuesMap;
    }

    private static ConvertUtilsBean converter = BeanUtilsBean.getInstance().getConvertUtils();

    private static Map<String, String> convertObject(Object value, String key, Set cache) {
        //if this type has a registered converted, then get the string and return
        if (converter.lookup(value.getClass()) != null) {
            String stringValue = converter.convert(value);
            Map<String, String> valueMap = new HashMap<String, String>();
            valueMap.put(key, stringValue);
            return valueMap;
        } else {
            //otherwise, treat it as a nested bean that needs to be described itself
            return recursiveDescribe(value, key, cache);
        }
    }
}

Answer 2

刚刚找到了一种有用的方法来实现与最初通过 Eclipse 的类型层次结构提出的要求非常相似的东西。

有一个名为“显示所有继承成员”的切换开关，如下图红色箭头所示：

选择此选项后，除了所选类的字段和方法之外，还会显示所有超类的字段和方法（清楚地指示每个超类的字段和方法来自何处），如下所示：

（当然，这不仅仅包括属性，但由于 getter 按字母顺序显示，并且有公共/私有/受保护的图标，因此可以使用它轻松获取此信息。）