技術標籤：Java基礎

在開發CRM系統中，遇到合併客戶的需求，就是將兩個客戶進行合併，將源客戶合併到目標客戶中，主要是利用java反射來實現。

public static void copy(Object target, Object source) throws Exception {
        Field[] field = target.getClass().getDeclaredFields();
        Method[] mm = target.getClass().getDeclaredMethods();
        for (int j = 0; j <
 
 field.length; j++) {
            String name = field[j].getName();
            String type = field[j].getGenericType().toString();
            if (type.equals("class java.lang.String")) {
                Method m = target.getClass().getMethod("get" + toUpperCaseFirstOne(name));
                String targetValue =
 
 (String) m.invoke(target);
                String sourceValue = (String) m.invoke(source);
                if (StrUtil.isEmptyOrUndefined(targetValue) && !StrUtil.isEmptyOrUndefined(sourceValue)) {
                    m = target.getClass().getMethod("set" + toUpperCaseFirstOne(name)
 
, String.class);
                    m.invoke(target, sourceValue);
                }
            } else if ("int".equals(type)) {
                Method m = target.getClass().getMethod("get" + toUpperCaseFirstOne(name));
                Integer value = (Integer) m.invoke(target);
                Integer value2 = (Integer) m.invoke(source);
                if (value == null) {
                    m = target.getClass().getMethod("set" + toUpperCaseFirstOne(name), Integer.class);
                    m.invoke(target, value2);
                }
            }
        }

    }

    private static String toLowerCaseFirstOne(String s) {
        if (Character.isLowerCase(s.charAt(0)))
            return s;
        else
            return (new StringBuilder()).append(Character.toLowerCase(s.charAt(0))).append(s.substring(1)).toString();
    }

    private static String toUpperCaseFirstOne(String s) {
        if (Character.isUpperCase(s.charAt(0)))
            return s;
        else
            return (new StringBuilder()).append(Character.toUpperCase(s.charAt(0))).append(s.substring(1)).toString();
    }