为简化和统一,需要给javabean实例统一赋值,实现代码如下(已测试)
import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.List; import java.util.Map; import java.util.Map.Entry; import com.xxx.entity.Call; import java.lang.reflect.Field; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; public class ReflectUtils { @SuppressWarnings("rawtypes") public static Map<String,Class> getPoJoFiled(Class cls){ Map<String,Class> names=new HashMap<>(); Field[] fileds=cls.getDeclaredFields(); for(Field filed:fileds){ names.put(filed.getName(), filed.getType()); } return names; } @SuppressWarnings("rawtypes") public static List<String> getSetMethodName(Class cls){ List<String> methodNames=new ArrayList<>(); Method[] methods =cls.getDeclaredMethods(); for(Method method:methods){ if(method.getName().startsWith("set")){ methodNames.add(method.getName()); } } return methodNames; }
private static String getMethodNameByField(List<String> methodNames, String filedName) { for (String method : methodNames) { if (method.toLowerCase().equalsIgnoreCase("set" + filedName)) { return method; } } return ""; }
@SuppressWarnings({ "unchecked", "rawtypes" }) public static void initInstance(Object instance,String param) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException{ Class cls=instance.getClass(); Map<String,Class> fieldNames=ReflectUtils.getPoJoFiled(cls); List<String> methodNames=ReflectUtils.getSetMethodName(cls); for(Entry<String,Class> field:fieldNames.entrySet()){ String filedName=field.getKey(); String methodName=getMethodNameByField(methodNames,filedName); Method setMethodName = cls.getMethod(methodName, fieldNames.get(filedName)); String type=fieldNames.get(filedName).getName(); if(type.equals("java.lang.String")) { setMethodName.invoke(instance, new Object[] {param}); } else if(type.equals("int") || type.equals("java.lang.Integer")) { setMethodName.invoke(instance, new Object[] {new Integer(param)}); } else if(type.equals("long") || type.equals("java.lang.Long")) { setMethodName.invoke(instance, new Object[] {new Long(param)}); }else if (type.equals("float") || type.equals("java.lang.Float")) {
setMethodName.invoke(instance, new Object[]{new Float(param)});
} else if(type.equals("boolean") || type.equals("java.lang.Boolean")) {
setMethodName.invoke(instance, new Object[] { Boolean.valueOf(param) }); } else if(type.equals("java.util.Date")) { Date date = DateUtil.parseDateTime(param); if(date!=null) setMethodName.invoke(instance, new Object[] {date}); } } } public static void main(String[] args) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException { String param="20"; Call call=new Call(); initInstance(call,param); System.out.println(call.toString()); }
需要用到的公共类:
import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class DateUtil { /** * 得到当前的时间,自定义时间格式 y 年 M 月 d 日 H 时 m 分 s 秒 * @param dateFormat 输出显示的时间格式 * @return */ public final static String defaultFormat = "yyyy-MM-dd HH:mm:ss"; public static String getCurrentDate(String dateFormat) { SimpleDateFormat sdf = new SimpleDateFormat(dateFormat); return sdf.format(new Date()); } public static Date parseDateTime(String date){ SimpleDateFormat formatter = new SimpleDateFormat(defaultFormat); Date newDate = null; try { newDate = formatter.parse(date); } catch (ParseException e) { e.printStackTrace(); } return newDate; } }