get Field Value Map from a Java Bean Object - Java Reflection

Java examples for Reflection:Java Bean

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Description

get Field Value Map from a Java Bean Object

Demo Code


//package com.java2s;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Locale;
import java.util.Map;

public class Main {
    public static void main(String[] argv) throws Exception {
        Object bean = "java2s.com";
        System.out.println(getFieldValueMap(bean));
    }/*from w w  w.  j a v a 2  s  . com*/

    public static Map<String, String> getFieldValueMap(Object bean) {
        Class<?> cls = bean.getClass();
        Map<String, String> valueMap = new HashMap<String, String>();
        // ????bean??????
        Method[] methods = cls.getDeclaredMethods();
        Field[] fields = cls.getDeclaredFields();

        for (Field field : fields) {
            try {
                String fieldType = field.getType().getSimpleName();
                String fieldGetName = parGetName(field.getName());
                if (!checkGetMet(methods, fieldGetName)) {
                    continue;
                }
                Method fieldGetMet = cls.getMethod(fieldGetName,
                        new Class[] {});
                Object fieldVal = fieldGetMet.invoke(bean, new Object[] {});
                String result = null;
                if ("Date".equals(fieldType)) {
                    result = fmtDate((Date) fieldVal);
                } else {
                    if (null != fieldVal) {
                        result = String.valueOf(fieldVal);
                    }
                }
                if (result != null && !"".equals(result)
                        && !"page".equals(field.getName())
                        && !"rows".equals(field.getName())) {
                    valueMap.put(field.getName(), result);
                }
            } catch (Exception e) {
                continue;
            }
        }
        return valueMap;

    }

    public static String parGetName(String fieldName) {
        if (null == fieldName || "".equals(fieldName)) {
            return null;
        }
        return "get" + fieldName.substring(0, 1).toUpperCase()
                + fieldName.substring(1);
    }

    public static boolean checkGetMet(Method[] methods, String fieldGetMet) {
        for (Method met : methods) {
            if (fieldGetMet.equals(met.getName())) {
                return true;
            }
        }
        return false;
    }

    public static String fmtDate(Date date) {
        if (null == date) {
            return null;
        }
        try {
            SimpleDateFormat sdf = new SimpleDateFormat(
                    "yyyy-MM-dd HH:mm:ss", Locale.US);
            return sdf.format(date);
        } catch (Exception e) {
            return null;
        }
    }
}

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