copy Java Bean Properties - Java Reflection

Java examples for Reflection:Java Bean

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Description

copy Java Bean Properties

Demo Code


//package com.java2s;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

public class Main {


    @SuppressWarnings("unchecked")
    public static void copyProperties(Object target, Object source)
            throws Exception {

        Class sourceClz = source.getClass();
        Class targetClz = target.getClass();

        Field[] fields = sourceClz.getDeclaredFields();
        for (int i = 0; i < fields.length; i++) {
            String fieldName = fields[i].getName();
            Field targetField = null;
            try {
                // targetClz?fieldName?
                targetField = targetClz.getDeclaredField(fieldName);
            } catch (SecurityException e) {
                e.printStackTrace();//  w  w  w .j a  v  a2  s.co  m
                break;
            } catch (NoSuchFieldException e) {
                continue;
            }
            // sourceClz?targetClz
            if (fields[i].getType() == targetField.getType()) {
                // ?get?set?
                String getMethodName = "get"
                        + fieldName.substring(0, 1).toUpperCase()
                        + fieldName.substring(1);
                String setMethodName = "set"
                        + fieldName.substring(0, 1).toUpperCase()
                        + fieldName.substring(1);
                // get?set?Method
                Method getMethod;
                try {
                    getMethod = sourceClz.getDeclaredMethod(getMethodName,
                            new Class[] {});
                    Method setMethod = targetClz.getDeclaredMethod(
                            setMethodName, fields[i].getType());
                    // source?getMethod
                    Object result = getMethod.invoke(source,
                            new Object[] {});
                    // target?setMethod
                    if (result != null) {
                        if (!((result instanceof String) && ""
                                .equals(result.toString()))
                                && !((result instanceof Integer) && (Integer) result <= 0)
                                && !((result instanceof Long) && (Long) result <= 0)) {
                            setMethod.invoke(target, result);
                        }
                    }
                } catch (SecurityException e) {
                    e.printStackTrace();
                } catch (NoSuchMethodException e) {
                    e.printStackTrace();

                } catch (IllegalArgumentException e) {
                    e.printStackTrace();
                } catch (IllegalAccessException e) {
                    e.printStackTrace();

                } catch (InvocationTargetException e) {
                    e.printStackTrace();
                }

            } else {
                throw new Exception("?");
            }
        }
    }
}

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