Java利用反射机制反编译一个类

反编译类属性

package com.fanshe;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

public class ReflectTest06 {
    public static void main(String[] args) throws Exception {
        StringBuilder s = new StringBuilder();
        Class studentClass = Class.forName("java.lang.Integer"); //
        s.append("public class " +  studentClass.getSimpleName() +  "{\n");

        Field[] fields = studentClass.getDeclaredFields();
        for(Field field : fields) {
            s.append("\t");
            s.append(Modifier.toString(field.getModifiers()));
            s.append(" ");
            s.append(field.getType().getSimpleName());
            s.append(" ");
            s.append(field.getName());
            s.append(";\n");
        }

        s.append("}");
        System.out.println(s);
    }
}

反编译类方法的非方法体部分

package com.fanshe;

import java.lang.reflect.Method;
import java.lang.reflect.Modifier;

public class ReflectTest09 {
    public static void main(String[] args) throws Exception {
        StringBuilder s = new StringBuilder();
        Class userServiceClass = Class.forName("java.lang.String");
        s.append(Modifier.toString(userServiceClass.getModifiers()) + " class "
            + userServiceClass.getSimpleName() + "{\n");
        Method[] methods = userServiceClass.getDeclaredMethods();
        for(Method method : methods) {
            s.append("\t");
            s.append(Modifier.toString(method.getModifiers()));
            s.append(" ");
            s.append(method.getReturnType().getSimpleName());
            s.append(" ");
            s.append(method.getName());
            s.append("(");
            Class[] parameterTypes = method.getParameterTypes();
            for(Class parameterType : parameterTypes) {
                s.append(parameterType.getSimpleName());
                s.append(",");
            }
            s.deleteCharAt(s.length() - 1);


            s.append("){}\n");
        }

        s.append("}");
        System.out.println(s);
    }
}

反编译构造方法

package com.fanshe;

import java.lang.reflect.Constructor;
import java.lang.reflect.Modifier;

public class ReflectTest11 {
    public static void main(String[] args) throws Exception {
        StringBuilder s = new StringBuilder();
        Class vipClass = Class.forName("java.lang.String");
        s.append(Modifier.toString(vipClass.getModifiers()));
        s.append(" class ");
        s.append(vipClass.getSimpleName());
        s.append("{\n");

        //拼接构造方法
        Constructor[] constructors = vipClass.getDeclaredConstructors();
        for(Constructor constructor : constructors) {
            s.append("\t");
            s.append(Modifier.toString(constructor.getModifiers()));
            s.append(" ");
            s.append(vipClass.getSimpleName());
            s.append("(");
            //拼接参数
            Class[] parameterTypes = constructor.getParameterTypes();
            for(Class paraterType : parameterTypes) {
                s.append(paraterType.getSimpleName());
                s.append(",");
            }
            if(parameterTypes.length > 0)
                s.deleteCharAt(s.length() - 1);

            s.append("){}\n");
        }


        s.append("}");
        System.out.println(s);
    }
}