Java Bean 遍历和使用注解给Bean的属性添加属性值

import java.lang.reflect.Field; import java.lang.reflect.Method; import java.lang.reflect.Modifier; import java.util.ArrayList; import java.util.List; public class MainTest { private static UserBean userBean; /** * @param args * @throws Exception */ public static void main(String[] args) throws Exception { setUserBean(); traversalBean(); } // 创建User Bean对象，并设值 private static void setUserBean() { userBean = new UserBean(); userBean.setId("123"); userBean.setName("Jack"); userBean.setAge("35"); userBean.setEmail("jack@127.com"); List<String> favouriteList = new ArrayList<String>(); favouriteList.add("跑步"); favouriteList.add("游泳"); favouriteList.add("篮球"); favouriteList.add("旅游"); userBean.setFavourite(favouriteList); } // 遍历 Bean private static void traversalBean() throws Exception{ // 通过Bean的属性遍历 Field[] fields = userBean.getClass().getDeclaredFields(); for (Field field : fields) { String mod = Modifier.toString(field.getModifiers()); System.out.println("mod = " + mod); // 跳过静态属性 if (mod.indexOf("static") != -1) { continue; } // 取得注解的设置的属性值 SetFieldAttribute setField = field.getAnnotation(SetFieldAttribute.class); if (setField != null) { String fieldName = setField.fieldName(); String fieldType = setField.fieldType(); System.out.println("注解的属性 fieldName = " + fieldName); System.out.println("注解的属性 fieldType = " + fieldType); String getMethod = "get" + field.getName().substring(0, 1).toUpperCase() + field.getName().substring(1); System.out.println("User Bean 属性的Get方法名 getMethod = " + getMethod); Class[] methodParam = null; Object[] params = {}; Object retVal = userBean.getClass().getMethod(getMethod, methodParam).invoke(userBean, params); if (fieldType.equals("list")) { List<String> favouriteList = (List<String>) retVal; int i = 1; for (String favourite : favouriteList) { System.out.println("User Bean 属性的值 " + field.getName() + " : " + i + " = " + favourite); i++; } } else { // 取得Bean属性的值 System.out.println("User Bean 属性的值 " + field.getName() + " = " + retVal); } } } System.out.println("******************************************************************"); // 通过Bean的方法遍历 Method[] methods = userBean.getClass().getDeclaredMethods(); for (Method method : methods) { // 取得注解的设置的属性值 SetFieldAttribute setField = method.getAnnotation(SetFieldAttribute.class); if (setField != null) { String fieldName = setField.fieldName(); String fieldType = setField.fieldType(); System.out.println("注解的属性 fieldName = " + fieldName); System.out.println("注解的属性 fieldType = " + fieldType); Class[] methodParam = null; Object[] params = {}; Object retVal = null; if (method.getName().substring(0,3).equals("get")) { String mod = Modifier.toString(method.getModifiers()); System.out.println("mod = " + mod); System.out.println("User Bean 属性的Get方法名 getMethod = " + method.getName()); retVal = userBean.getClass().getMethod(method.getName(), methodParam).invoke(userBean, params); if (fieldType.equals("list")) { List<String> favouriteList = (List<String>) retVal; int i = 1; for (String favourite : favouriteList) { System.out.println("User Bean 属性的值 " + method.getName() + " : " + i + " = " + favourite); i++; } } else { // 取得Bean属性的值 System.out.println("User Bean 属性的值 " + method.getName() + " = " + retVal); } } } } } }