学完反射后做的简单的自动实例化项目？

 1 import java.lang.annotation.*; 2 import java.lang.reflect.Array; 3 import java.lang.reflect.Constructor; 4 import java.lang.reflect.InvocationTargetException; 5 import java.lang.reflect.Method; 6 import java.util.*; 7  8 public class TestAnnotation { 9  static int count = 0; 10  11  public static void main(String[] args) throws IllegalAccessException, InvocationTargetException, InstantiationException, ClassNotFoundException { 12   String annoName = "hahah"; 13   String[] a = new String[10]; 14   System.out.println(a.toString()); 15   testClass("Student", annoName); 16  } 17  18  public static void testClass(String className, String annoName) throws ClassNotFoundException, IllegalAccessException, InvocationTargetException, InstantiationException { 19   System.out.println(); 20   System.out.println("开始定位：" + className); 21   Class c = Class.forName(className); 22   Class cCopy =c; 23   if (c.getAnnotation(Class.forName(annoName)) != null) { 24    System.out.println("该类带有注解" + annoName + "，开始实例化测试。"); 25    Constructor[] declaredConstructors = c.getDeclaredConstructors(); 26  27    for (Constructor constructor :declaredConstructors) { 28     System.out.print("构造器为："); 29     System.out.println(constructor); 30     Method[][] methods = getMethods(c); 31     Object o = getInstance(constructor); 32     runMethods(o,methods); 33    } 34   } else { 35    System.out.println("该类未被" + annoName + "注解，不进行实例测试。"); 36   } 37  } 38  public static Method[][] getMethods(Class c) throws InvocationTargetException, IllegalAccessException, InstantiationException, ClassNotFoundException { 39   Method[] methods = c.getDeclaredMethods(); 40   ArrayList<Method> methodsVoid = new ArrayList<Method>(); 41   ArrayList<Method> methodsOthers = new ArrayList<Method>(); 42   //将方法分为有返回方法和无返回方法，有返回方法前后各执行一次，无返回方法中间执行一遍。 43   for (Method method : methods) { 44    if (method.getReturnType().toString().equals("void")) { 45     methodsVoid.add(method); 46    } else { 47     methodsOthers.add(method); 48    } 49   } 50   while(true){ 51    c = c.getSuperclass(); 52    if(c.getName().equals("java.lang.Object")){ 53     break; 54    }else{ 55     methods = c.getDeclaredMethods(); 56     //将方法分为有返回方法和无返回方法，有返回方法前后各执行一次，无返回方法中间执行一遍。 57     for (Method method : methods) { 58      if (method.getReturnType().toString().equals("void")) { 59       methodsVoid.add(method); 60      } else { 61       methodsOthers.add(method); 62      } 63     } 64    } 65   } 66  67   return new Method[][]{methodsVoid.toArray(new Method[methodsVoid.size()]),methodsOthers.toArray(new Method[methodsOthers.size()])}; 68  } 69  70  public static void runMethods(Object o, Method[][] methods) throws InvocationTargetException, IllegalAccessException, InstantiationException, ClassNotFoundException { 71   for (Method method : methods[1]) { 72    System.out.println(method); 73    System.out.print("方法:" + method.getName() + " "); 74    System.out.print("参数为："); 75    ArrayList argsList = getArgus(method); 76    System.out.println(argsList); 77    System.out.println(argsList.toString()); 78    System.out.print("返回结果："); 79    System.out.println(method.invoke(o, argsList.toArray())); 80   } 81   for (Method method : methods[0]) { 82    System.out.print("方法:" + method.getName() + " "); 83    System.out.print("参数为："); 84    ArrayList argsList = getArgus(method); 85    System.out.println(argsList.toString()); 86    System.out.print("返回结果："); 87    System.out.println(method.invoke(o, argsList.toArray())); 88   } 89   for (Method method : methods[1]) { 90    System.out.print("方法:" + method.getName() + " "); 91    System.out.print("参数为："); 92    ArrayList argsList = getArgus(method); 93    System.out.println(argsList.toString()); 94    System.out.print("返回结果："); 95    System.out.println(method.invoke(o, argsList.toArray())); 96   } 97  } 98  99  public static ArrayList getArgus(Method method) throws ClassNotFoundException, InvocationTargetException, InstantiationException, IllegalAccessException {100   Class[] parameters = method.getParameterTypes();101   ArrayList argsList = new ArrayList();102   if (parameters.length > 0) {103    for (Class parameter : parameters) {104     argsList.add(getArgu(parameter));105    }106   }107   return argsList;108  }109  //重载一下110  public static Object[] getArgus(Constructor constructor) throws ClassNotFoundException, InvocationTargetException, InstantiationException, IllegalAccessException {111   Class[] parameters = constructor.getParameterTypes();112   List argsList = new ArrayList();113   if (parameters.length > 0) {114    for (Class parameter : parameters) {115     argsList.add(getArgu(parameter));116    }117   }118   return argsList.toArray();119  }120 121 122  public static Object getArgu(Class parameter) throws ClassNotFoundException, InvocationTargetException, InstantiationException, IllegalAccessException {123   if (parameter.isArray()) {124    int num = 10;125    Class pp = parameter.getComponentType();126    Object list = Array.newInstance(pp,num);127    for (int i = 0; i < num; i++) {128     Array.set(list,i,getArgu(pp));//数组对象递归初始化参数129    }130    return list;131   } else {132    String[] p = parameter.getName().split("\\.");133    String pp = p[p.length - 1];134    if (pp.equals("String")) {135     int num = new Random().nextInt(10) + 1;136     return getRandomString(num);137    } else if (pp.equals("int")) {138     return getRandomInt(100);139    } else if (pp.equals("byte")) {140     return getRandomByte();141    } else if (pp.equals("short")) {142     return getRandomShort();143    } else if (pp.equals("long")) {144     return getRandomLong();145    } else if (pp.equals("float")) {146     return getRandomFloat();147    } else if (pp.equals("double")) {148     return getRandomDouble();149    } else if (pp.equals("char")) {150     return getRandomChar();151    } else {152     return getInstance(pp);153 154    }155   }156  }157  public static Object getInstance(String className) throws ClassNotFoundException, IllegalAccessException, InvocationTargetException, InstantiationException {158   Class c = Class.forName(className);159   Constructor[] constructors = c.getDeclaredConstructors();160   Constructor constructor = constructors[count++ % constructors.length];161   return getInstance(constructor);162  }163 164  public static Object getInstance(Constructor constructor) throws ClassNotFoundException, IllegalAccessException, InvocationTargetException, InstantiationException {165 //  Constructor constructor = constructors[new Random().nextInt(constructors.length)];166 //  System.out.println(constructor);167   return constructor.newInstance(getArgus(constructor));168  }169 170  public static String getRandomString(int length) {171   String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";172   Random random = new Random();173   StringBuffer sb = new StringBuffer();174   for (int i = 0; i < length; i++) {175    int number = random.nextInt(62);176    sb.append(str.charAt(number));177   }178   return sb.toString();179  }180 181  public static int getRandomInt(int max) {182   int a = new Random().nextInt(max);183   if (getRandomBoolean()){184    a = - a;185   }186   return a;187  }188  public static int getRandomInt() {189   int a = getRandomInt(Integer.MAX_VALUE);190   return a;191  }192  public static byte getRandomByte() {193   return (byte)getRandomInt(Byte.MAX_VALUE);194  }195  public static short getRandomShort() {196   return (short)getRandomInt(Short.MAX_VALUE);197  }198  public static long getRandomLong() {199   long a = new Random().nextLong();200   if (getRandomBoolean()){201    a = - a;202   }203   return a;204  }205  public static float getRandomFloat() {206   float a = new Random().nextFloat();207   if (getRandomBoolean()){208    a = - a;209   }210   return a;211  }212  public static double getRandomDouble() {213   double a = new Random().nextDouble();214   if (getRandomBoolean()){215    a = - a;216   }217   return a;218  }219  public static boolean getRandomBoolean(){220   return new Random().nextBoolean();221  }222  public static char getRandomChar(){223   return (char) getRandomInt(Character.MAX_VALUE);224  }225 226 }
227 //文件类的get就不弄了，可以动态生成各个类型文件，或者弄些文件夹，每个文件夹一种类型，把文件都放进去，然后随机获取。228 @Target(ElementType.TYPE)229 @Retention(RetentionPolicy.RUNTIME)230 @interface hahah {231 }232 233 234 class Person {235  String name;236  int age;237 238  public Person() {239 240  }241 242  public Person(String name, int age) {243   this.name = name;244   this.age = age;245  }246 247  public String getName() {248   return name;249  }250 251  public void setName(String name, Test t, int[] ha,String[] s,Student[] st) {252   this.name = name;253  }254 255  public int getAge() {256   return age;257  }258 259  public void setAge(int age) {260   this.age = age;261  }262 263  @Override264  public String toString() {265   return "Person{" +266     "name='" + name + '\'' +267     ", age=" + age +268     '}';269  }270 }271 @hahah272 class Student extends Person{273 public void pr(){274  System.out.println("hhaha");275 }276 }277 278 class Test {279 280 }

 

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1importjava.lang.annotation.*;2importjava.lang.reflect.Array;3importjava.lang.reflect.Constructor;4importjava.lang.reflect.InvocationTargetException;5importjava.lang.reflect.Method;6importjava.util.*;
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