自定义反射类

た入场券 2022-05-28 05:57 237阅读 0赞

package com.baofoo.admin.utils;
    
    import java.lang.reflect.Field;
    import java.lang.reflect.Method;
    import java.util.ArrayList;
    import java.util.Arrays;
    import java.util.List;
    
    /**
     * Created by caox on 2018/3/30.
     */
    public class ReflectUtils {
    
        /**
         * 根据属性名设置 属性值
         * @param object 对象类
         * @param properityName 属性名
         * @param properityType 属性类型 全类名 e.g:java.lang.String
         * @param realProperties 要改变的属性值
         * @return
         */
        public static Object setProperityByName(Object object, String properityName, String properityType, String realProperties){
            Field[] fieldsAll  =  getAllFields(object);
            for(Field fAll : fieldsAll){
                try {
                    // 获取属性的类型
                    String type = fAll.getGenericType().toString();
                    if (properityType.equals(type) && properityName.equals(fAll.getName())){
                        fAll.setAccessible(true);
                        fAll.set(object, realProperties);
                    }
                } catch (IllegalAccessException e) {
                    e.printStackTrace();
                }
            }
            return  object;
        }
    
        /**
         * 递归取类的属性名
         * @param object
         * @return
         */
        public static Field[] getAllFields(Object object){
            Class clazz = object.getClass();
            List<Field> fieldList = new ArrayList<Field>();
            while (clazz != null){
                fieldList.addAll(new ArrayList<Field>(Arrays.asList(clazz.getDeclaredFields())));
                clazz = clazz.getSuperclass();
            }
            Field[] fields = new Field[fieldList.size()];
            fieldList.toArray(fields);
            return fields;
        }
    
        /**
         * 获取类对象对应属性名 的 对应值
         * @param object
         * @return
         */
        public static String getPropertiesNameAndValue(Object object,String propertiesName){
            Method[] methods = object.getClass().getMethods();
            String result = "";
            for(int i = 0; i < methods.length; i++){
                Method method = methods[i];
                if(method.getName().startsWith("get") &&
                        method.getName().equals("get" + (new StringBuilder()).append(Character.toUpperCase(propertiesName.charAt(0))).append(propertiesName.substring(1)).toString())){
    //                System.out.print("methodName:"+method.getName()+"\t");
                    try {
                        //得到get 方法的值
    //                    System.out.println("value:"+method.invoke(object));
                     result =  (String) method.invoke(object);
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }else{
    
                }
            }
            return  result;
        }
    }

Object : 具体的实例类带入

利用上述自定义反射方法 在排除类内含有List类型的属性（这里除去类内的List类型属性其他属性都为String类型，但凡这些属性后面带有多余“，”进行批量去除）：

try
            {
                BFA00202 bfa00202 = new BFA00202();
                bfa00202.setiDType("iDType,");
                bfa00202.setApplicationID("applicationID,");
                bfa00202.setMessageFrom("messageFrom,");
                System.out.println(bfa00202.toString());
                Field[] fields = ReflectUtils.getAllFields(bfa00202);
                for (Field  field :fields) {
                    if (!("java.util.List".equals(field.getType().getName()))) {
                        // 如果type是类类型，则前面包含"class "，后面跟类名
                        if (field.getGenericType().toString().equals(
                                "class java.lang.String")) {
                            // 拿到该属性的gettet方法
                            Method m ;
                            try{
                                 m = (Method) bfa00202.getClass().getMethod(
                                        "get" + getMethodName(field.getName()));
                            }catch (Exception e){
                                m = (Method) bfa00202.getClass().getMethod(
                                        "get" + (field.getName()));
                            }
                            // 调用getter方法获取属性值
                            String val = (String) m.invoke(bfa00202);
                            if (val != null) {
                                // 但凡属性值里面有非ArryList型且带后面多余","均去掉
                                String valEnd = delStringFrom(val);
                                System.out.println("String type:" + valEnd);
                                field.setAccessible(true);
                                field.set(bfa00202, valEnd);
                            }
    
                        }
    
                    }
                }
                System.out.println(bfa00202.toString());
            }
            catch (Exception e) {
                e.printStackTrace();
            }

复杂情况二：处理BFA002类中有List型的属性,本例中处理List中内属性字段带",noData"和是noData两种数据情况处理，第一种去掉，第二种置为null：

/**
         *  把一个字符串的第一个字母大写、效率是最高的
         */
        private static String getMethodName(String fildeName) throws Exception{
            byte[] items = fildeName.getBytes();
            items[0] = (byte) ((char) items[0] - 'a' + 'A');
            return new String(items);
        }
    
        /**
         * 判断字符串是否含有“，”去掉逗号以后的字符
         */
        public static String delStringFrom(String str){
            if(str.contains(",")){
                int pos = str.indexOf(",");
                str  = str.substring(0,pos);
            }
            return str;
        }
    
        /**
         * 对应处理类内List中第二种情况
         * @param str
         * @return
         */
        public static String delNullFrom(String str){
            if("noData".equals(str)){
                str  = null;
            }
            return str;
        }
    
        /**
         * 对应处理类内List中第一种情况
         * @param str
         * @return
         */
        public static String delNoDateFrom(String str){
            if(null != str &&  str.contains(",noData")){
                int pos = str.indexOf(",noData");
                str  = str.substring(0,pos);
            }
            return str;
        }
    
        /**
         * 处理BFA002类中有List型的属性
         * 本例中处理List中内属性字段带",noData"和是noData两种数据情况处理，第一种去掉，第二种置为null
         * @param objects
         * @return
         * @throws Exception
         */
        public static List<Object> dealStringFromArrayList(List<Object> objects) throws Exception{
            for(Object object : objects){
                Field[] fields = ReflectUtils.getAllFields(object);
                for (Field  field :fields) {
                    Method m ;
                    try{
                        m = (Method) object.getClass().getMethod(
                                "get" + getMethodName(field.getName()));
                    }catch (Exception e){
                        m = (Method) object.getClass().getMethod(
                                "get" + (field.getName()));
                    }
                    // 调用getter方法获取属性值
                    String val = (String) m.invoke(object);
                    if (val != null) {
                        String valEnd = delNullFrom(val);
                        System.out.println("valEnd : " + valEnd);
                        String valEnd_End =  delNoDateFrom(valEnd);
                        field.setAccessible(true);
                        field.set(object, valEnd_End);
                    }
                }
            }
            return  objects;
        }
    
        public static void main(String[] args) {
            try
            {
                BFA00202 bfa00202 = new BFA00202();
                bfa00202.setiDType("iDType,");
                bfa00202.setApplicationID("applicationID,");
                bfa00202.setMessageFrom("messageFrom,");
                List<Association> associationList = new ArrayList<Association>();
                Association association = new Association();
                association.setBindingDataType("01,noData");
                association.setBindingData("02,noData");
                Association association1 = new Association();
                association1.setBindingDataType("noData");
                association1.setBindingData("noData");
                associationList.add(association);
                associationList.add(association1);
                bfa00202.setAssociations(associationList);
    
                System.out.println(bfa00202.toString());
                for(Association accoc : bfa00202.getAssociations()){
                    System.out.println(ToStringBuilder.reflectionToString(accoc));
                }
                Field[] fields = ReflectUtils.getAllFields(bfa00202);
                for (Field  field :fields) {
                    if (!("java.util.List".equals(field.getType().getName()))) {
                        // 如果type是类类型，则前面包含"class "，后面跟类名
                        if (field.getGenericType().toString().equals(
                                "class java.lang.String")) {
                            // 拿到该属性的gettet方法
                            Method m ;
                            try{
                                 m = (Method) bfa00202.getClass().getMethod(
                                        "get" + getMethodName(field.getName()));
                            }catch (Exception e){
                                m = (Method) bfa00202.getClass().getMethod(
                                        "get" + (field.getName()));
                            }
                            // 调用getter方法获取属性值
                            String val = (String) m.invoke(bfa00202);
                            if (val != null) {
                                // 但凡属性值里面有非ArryList型且带后面多余","均去掉
                                String valEnd = delStringFrom(val);
                                System.out.println("String type:" + valEnd);
                                field.setAccessible(true);
                                field.set(bfa00202, valEnd);
                            }
                        }
                    }else{
                        // 处理BFA002类中有List型的属性,本例中处理List中内属性字段带",noData"和是noData两种数据情况处理，第一种去掉，第二种置为null
                        Method m ;
                        try{
                            m = (Method) bfa00202.getClass().getMethod(
                                    "get" + getMethodName(field.getName()));
                            List<Object> val = (List<Object> ) m.invoke(bfa00202);
    
                            List<Object> valEnd = dealStringFromArrayList(val);
                            field.setAccessible(true);
                            field.set(bfa00202, valEnd);
                        }catch (Exception e){
                            e.printStackTrace();
                        }
                    }
                }
                System.out.println(bfa00202.toString());
                for(Association accoc : bfa00202.getAssociations()){
                    System.out.println(ToStringBuilder.reflectionToString(accoc));
                }
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }

结果如下：

![70][]

[70]: /images/20220528/d7935843942b4371beaf81029182cfa0.png