java 反射工具类

1.ReflectUtil.java

package com.example.sjjg.java;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Parameter;

public class ReflectUtil {

    private static String getModifier(int i){
        switch (i){
            case 1  :
            case 2  : return "public";
            case 3  : return "private";
            case 9  : return "public static";
            case 10 : return "private static";

            case 18 : return "private final";
            case 25 : return "public static final";
        }
        return "" + i;
    }

    public static void printClass(Class clazz){
        System.out.println("printAllMethods");
        Class supper = clazz.getSuperclass();
        Class interfaces[] = clazz.getInterfaces();
        StringBuilder data = new StringBuilder();
        data.append(" \n---------------------class.info -------------------\n");
        data.append("package = " + clazz.getPackage());

        data.append("\nname = " + clazz.getName());
        data.append("\ntypeName = " + clazz.getTypeName());
        data.append("\nsimpleName = " + clazz.getSimpleName());
        data.append("\nCanonicalName = " + clazz.getCanonicalName());
        data.append("\nextends = " + supper.getCanonicalName());
        data.append("\nimplements [ " + interfaces.length + " ]  = ");

        for (int i = 0; i < interfaces.length; ++i){
            Class intfc = interfaces[i];
            data.append(intfc.getCanonicalName() + ( i < interfaces.length - 1 ? "," : ""));
        }
        System.out.println(data);

        Constructor[] cons = clazz.getDeclaredConstructors();
        data.delete(0,data.length());
        data.append(" \n---------------------所有构造方法 [" + cons.length + "]-------------------\n");

        for (Constructor constructor : cons){
            data.append(getModifier(constructor.getModifiers()) + "\t" + constructor.getName() +  "( ");
            Parameter parameters[] = constructor.getParameters();
            for (int i = 0 ;i < parameters.length;++i){
                Parameter parameter = parameters[i];
                data.append(parameter.getType().getSimpleName() + (i < parameters.length - 1 ?  "," : ""));
            }
            data.append(" )\n");
        }
        System.out.println(data);


        cons = clazz.getConstructors();
        data.delete(0,data.length());
        data.append(" \n---------------------公开构造方法 [" + cons.length + "]-------------------\n");
        for (Constructor constructor : cons){
            data.append(getModifier(constructor.getModifiers()) + "\t" + constructor.getName() + "( ");
            Parameter parameters[] = constructor.getParameters();
            for (int i = 0 ;i < parameters.length;++i){
                Parameter parameter = parameters[i];
                data.append(parameter.getType().getSimpleName() + (i < parameters.length - 1 ?  "," : ""));
            }
            data.append(" )\n");
        }
        System.out.println(data);


        Method[] methods = clazz.getDeclaredMethods();
        data.delete(0,data.length());
        data.append(" \n---------------------类方法（不含基类） [" + methods.length + "]-------------------\n");
        for (Method method : methods){
            data.append(getModifier(method.getModifiers()) + "\t" + method.getName() + "( " );
            Parameter parameters[] = method.getParameters();
            for (int i = 0 ;i < parameters.length;++i){
                Parameter parameter = parameters[i];
                data.append(parameter.getType().getSimpleName() + (i < parameters.length - 1 ?  "," : ""));
            }
            data.append(" )\n");
        }
        System.out.println(data);


        methods = clazz.getMethods();
        data.delete(0,data.length());
        data.append(" \n---------------------类方法（含基类）  [" + methods.length + "]-------------------\n");
        for (Method method : methods){
            data.append(getModifier(method.getModifiers()) + "\t" + method.getName() + "( ");
            Parameter parameters[] = method.getParameters();
            for (int i = 0 ;i < parameters.length;++i){
                Parameter parameter = parameters[i];
                data.append(parameter.getType().getSimpleName() + (i < parameters.length - 1 ?  "," : ""));
            }
            data.append(" )\n");
        }
        System.out.println(data);


        Field[] fields = clazz.getFields();
        data.delete(0,data.length());

        data.append(" \n---------------------类公开属性（含基类）  [" + fields.length + "]-------------------\n");
        for (Field field : fields){
            data.append( getModifier(field.getModifiers()) + "\t" + field.getType().getSimpleName() + "\t" + field.getName() );
            data.append( "\n");
        }
        System.out.println(data);


        fields = clazz.getDeclaredFields();
        data.delete(0,data.length());
        data.append(" \n---------------------类定义的属性（不含基类）  [" + fields.length + "]-------------------\n");
        for (Field field : fields){
            data.append( getModifier(field.getModifiers()) + "\t" + field.getType().getSimpleName() + "\t" + field.getName() );
            data.append( "\n");
        }
        System.out.println(data);


        System.out.println(" printAllMethods : ==========-------=========== =======\n" );
    }
}