private static <T> void fillWithConstructor(
@NonNull final CursorGetter getter,
final List<T> lists,
final @NonNull Constructor<T> constructor) {
try {
while (getter.moveToNext()) {
lists.add(constructor.newInstance(getter));
}
} catch (final InstantiationException e) {
throw new IllegalArgumentException(
"go and make the constructor "
+ constructor.getName()
+ "(CursorWrapper.CursorGetter) accessible",
e);
} catch (final IllegalAccessException e) {
throw new IllegalArgumentException(
"go and make the constructor "
+ constructor.getName()
+ "(CursorWrapper.CursorGetter) accessible",
e);
} catch (final InvocationTargetException e) {
throw new IllegalArgumentException(
"go and make the constructor "
+ constructor.getName()
+ "(CursorWrapper.CursorGetter) accessible",
e);
}
}
/**
* Finds constructors of the specified access level in the supplied class.
*
* @param c the class to search in
* @param level the access level to look for
* @param sb the StringBuffer where the results should be added
*/
private static void listConstructors(Class c, int level, StringBuffer sb) {
Constructor[] constrs = c.getDeclaredConstructors();
Constructor constructor;
Class[] exceptions;
StringBuffer cons;
for (int index = 0; index < constrs.length; index++) {
constructor = constrs[index];
if (isAccessible(constructor.getModifiers(), level)) {
cons = new StringBuffer(100);
cons.append(printConstructor(constructor.getName(), constructor.getParameterTypes()));
// Add exceptions
exceptions = constructor.getExceptionTypes();
if (exceptions.length > 0) {
cons.append(printExceptions(exceptions));
} else {
cons.append(NIL);
}
cons.append(END_PAREN);
if (sb.toString().lastIndexOf(cons.toString()) == -1) {
sb.append(cons);
}
}
}
}
public static void main(String[] args) throws Exception {
Class clazz = Class.forName("com.mtl.spring.aop.helloworld.ArithmeticCalculatorLoggingProxy");
Object object = clazz.newInstance();
Method[] methods = clazz.getMethods();
StringBuffer sb = new StringBuffer();
sb.append("public class ")
.append(object.getClass().getCanonicalName())
.append("{\n")
.append("Object object ")
.append("\n");
Constructor[] constructors = clazz.getConstructors();
for (Constructor constructor : constructors) {
sb.append("\npublic ").append(constructor.getName()).append("(");
Class<?> p[] = constructor.getParameterTypes();
for (int j = 0; j < p.length; ++j) {
sb.append(p[j].getName() + " arg" + j);
if (j < p.length - 1) {
sb.delete(sb.length() - 1, sb.length());
}
}
sb.append(") {").append("\n\n");
sb.append("user.role.cotain(\"/admin/add\") {");
sb.append("\n System.currentTimeMillis();\n");
sb.append("this.object = ").append("arg0");
sb.append("}");
sb.append(" \nSystem.currentTimeMillis();\n");
sb.append("\n}");
}
sb.append("\n\n}");
System.out.println(sb);
for (Method method : methods) {
System.out.println(method.getName());
}
}
private MBeanConstructorInfo[] createMBeanConstructorInfo(
MBeanMetaData metadata, MBeanDescription descrs) {
Class mbeanClass = metadata.mbean.getClass();
Constructor[] ctors = mbeanClass.getConstructors();
MBeanConstructorInfo[] constructors = new MBeanConstructorInfo[ctors.length];
for (int i = 0; i < ctors.length; ++i) {
Constructor constructor = ctors[i];
String descr = descrs == null ? null : descrs.getConstructorDescription(constructor);
Class[] params = constructor.getParameterTypes();
MBeanParameterInfo[] paramsInfo = new MBeanParameterInfo[params.length];
for (int j = 0; j < params.length; ++j) {
Class param = params[j];
String paramName =
descrs == null ? null : descrs.getConstructorParameterName(constructor, j);
String paramDescr =
descrs == null ? null : descrs.getConstructorParameterDescription(constructor, j);
paramsInfo[j] = new MBeanParameterInfo(paramName, param.getName(), paramDescr);
}
String ctorName = constructor.getName();
MBeanConstructorInfo info =
new MBeanConstructorInfo(
ctorName.substring(ctorName.lastIndexOf('.') + 1), descr, paramsInfo);
constructors[i] = info;
}
return constructors;
}
/**
* Constructs an <CODE>MBeanConstructorInfo</CODE> object. The {@link Descriptor} of the
* constructed object will include fields contributed by any annotations on the {@code
* Constructor} object that contain the {@link DescriptorKey} meta-annotation.
*
* @param description A human readable description of the operation.
* @param constructor The <CODE>java.lang.reflect.Constructor</CODE> object describing the MBean
* constructor.
*/
public MBeanConstructorInfo(String description, Constructor constructor) {
this(
constructor.getName(),
description,
constructorSignature(constructor),
Introspector.descriptorForElement(constructor));
}
/**
* ****************************************************************************
* 反射方法，打印对象的属性，方法，构造器属性
*
* @param obj 被反射对象 ***************************************************************************
*/
public static void reflect(Object obj) {
Class<?> cls = obj.getClass();
System.out.println("************构 造 器************");
Constructor<?>[] constructors = cls.getConstructors();
for (Constructor<?> constructor : constructors) {
System.out.println(
"构造器名称:"
+ constructor.getName()
+ "\t"
+ " "
+ "构造器参数类型:"
+ Arrays.toString(constructor.getParameterTypes()));
}
System.out.println("************属 性************");
Field[] fields = cls.getDeclaredFields();
// cls.getFields() 该方法只能访问共有的属性
// cls.getDeclaredFields() 可以访问私有属性
for (Field field : fields) {
System.out.println("属性名称:" + field.getName() + "\t" + "属性类型:" + field.getType() + "\t");
}
System.out.println("************方 法************");
Method[] methods = cls.getMethods();
for (Method method : methods) {
System.out.println(
"方法名:"
+ method.getName()
+ "\t"
+ "方法返回类型："
+ method.getReturnType()
+ "\t"
+ "方法参数类型:"
+ Arrays.toString(method.getParameterTypes()));
}
}
/** Builds an SCAdapter with the given constructor. */
static final SCAdapter buildsAdapterWith(Constructor adapterConstructor, Object[] parameters) {
SCAdapter newAdapter = null;
try {
newAdapter = (SCAdapter) adapterConstructor.newInstance(parameters);
} catch (InvocationTargetException ite) {
throw new RuntimeException(
"InvocationTarget Exception When Instantiating " + adapterConstructor.getName(), ite);
} catch (InstantiationException ie) {
throw new RuntimeException(
"Instantiation Exception When Instantiating " + adapterConstructor.getName(), ie);
} catch (IllegalAccessException iae) {
throw new RuntimeException(
"Illegal Access Exception When Instantiating " + adapterConstructor.getName(), iae);
}
return newAdapter;
}
public static <X> String createConstructorId(
Constructor<X> constructor,
Set<Annotation> annotations,
List<AnnotatedParameter<X>> parameters) {
StringBuilder builder = new StringBuilder();
builder.append(constructor.getDeclaringClass().getName());
builder.append('.');
builder.append(constructor.getName());
builder.append(createAnnotationCollectionId(annotations));
builder.append(createParameterListId(parameters));
return builder.toString();
}
public MessageQueueData createMessageQueueData(
final ByteBuffer buffer, final GameControllerMessageType type) {
final Constructor<? extends MessageQueueData> messageConstructor =
messageQueueDataConstructorMap.get(type);
if (messageConstructor == null) throw new MessageQueueDataTypeNotFoundException(type);
try {
return messageConstructor.newInstance(buffer);
} catch (Exception e) {
LOGGER.error("Unable to construct message {}", messageConstructor.getName(), e);
return null;
}
}
/**
* Runs the test using the specified harness.
*
* @param harness the test harness (<code>null</code> not permitted).
*/
public void test(TestHarness harness) {
// map of declared constructors which should exists
Map<String, String> testedDeclaredConstructors = null;
// map of declared constructors for (Open)JDK6
Map<String, String> testedDeclaredConstructors_jdk6 = new HashMap<String, String>();
// map of declared constructors for (Open)JDK7
Map<String, String> testedDeclaredConstructors_jdk7 = new HashMap<String, String>();
// map for constructors declared in (Open)JDK6
testedDeclaredConstructors_jdk6.put(
"public java.lang.TypeNotPresentException(java.lang.String,java.lang.Throwable)",
"java.lang.TypeNotPresentException");
// map for constructors declared in (Open)JDK7
testedDeclaredConstructors_jdk7.put(
"public java.lang.TypeNotPresentException(java.lang.String,java.lang.Throwable)",
"java.lang.TypeNotPresentException");
// create instance of a class TypeNotPresentException
final Object o = new TypeNotPresentException("TypeNotPresentException", new Throwable());
// get a runtime class of an object "o"
final Class c = o.getClass();
// get the right map containing constructor signatures
testedDeclaredConstructors =
getJavaVersion() < 7 ? testedDeclaredConstructors_jdk6 : testedDeclaredConstructors_jdk7;
// get all declared constructors for this class
java.lang.reflect.Constructor[] declaredConstructors = c.getDeclaredConstructors();
// expected number of constructors
final int expectedNumberOfConstructors = testedDeclaredConstructors.size();
// basic check for a number of constructors
harness.check(declaredConstructors.length, expectedNumberOfConstructors);
// check if all declared constructors exist
for (java.lang.reflect.Constructor declaredConstructor : declaredConstructors) {
// constructor name should consists of package name + class name
String constructorName = declaredConstructor.getName();
// modifiers + package + class name + parameter types
String constructorString = declaredConstructor.toString().replaceAll(" native ", " ");
harness.check(testedDeclaredConstructors.containsKey(constructorString));
harness.check(testedDeclaredConstructors.get(constructorString), constructorName);
}
}
public String format(Constructor<?> m) {
StringBuilder s = new StringBuilder();
s.append(m.getName());
Class<?>[] ps = m.getParameterTypes();
if (ps == null) {
s.append("()");
} else {
s.append("(");
for (int i = 0; i < ps.length; i++) {
if (i > 0) {
s.append(",");
}
s.append(ps[i].getSimpleName());
}
s.append(")");
}
return s.toString().trim();
}
/**
* Prints all constructors of a class
*
* @param cl a class
*/
public static void printConstructors(Class cl) {
Constructor[] constructors = cl.getDeclaredConstructors();
for (Constructor c : constructors) {
String name = c.getName();
System.out.print(" ");
String modifiers = Modifier.toString(c.getModifiers());
if (modifiers.length() > 0) System.out.print(modifiers + " ");
System.out.print(name + "(");
// print parameter types
Class[] paramTypes = c.getParameterTypes();
for (int j = 0; j < paramTypes.length; j++) {
if (j > 0) System.out.print(", ");
System.out.print(paramTypes[j].getName());
}
System.out.println(");");
}
}
private static void printConstructors(Class<?> aClass) {
Constructor<?>[] constructors = aClass.getDeclaredConstructors();
for (Constructor<?> constructor : constructors) {
String name = constructor.getName();
System.out.print(" ");
String modifiers = Modifier.toString(aClass.getModifiers());
if (modifiers.length() > 0) {
System.out.print(modifiers + " ");
}
System.out.print(name + "(");
Class<?>[] parameterTypes = constructor.getParameterTypes();
for (int i = 0; i < parameterTypes.length; i++) {
if (i > 0) {
System.out.print(", ");
}
System.out.print(parameterTypes[i].getName());
}
System.out.println(");");
}
}
public static void main(String[] args) {
A a = new A();
a.x = 2;
a.x();
System.out.println(a.x);
for (Method m : A.class.getDeclaredMethods()) {
System.out.println(String.format("%08X", m.getModifiers()) + " " + m.getName());
}
System.out.println("--------------------------");
for (Method m : A.class.getMethods()) {
System.out.println(
String.format("%08X", m.getModifiers())
+ " "
+ m.getReturnType().getSimpleName()
+ " "
+ m.getName());
}
System.out.println("--------------------------");
for (Constructor<?> c : A.class.getDeclaredConstructors()) {
System.out.println(String.format("%08X", c.getModifiers()) + " " + c.getName());
}
}
/** Reflect operations demo */
public static void reflect(Object obj) {
// `cls用于描述对象所属的类`
Class cls = obj.getClass();
print("Class Name: " + cls.getCanonicalName());
// `fields包含对象的所有属性`
Field[] fields = cls.getDeclaredFields();
print("List of fields:");
for (Field f : fields) {
print(String.format("%30s %15s", f.getType(), f.getName()));
}
// `methods包含对象的所有方法`
Method[] methods = cls.getDeclaredMethods();
print("List of methods:");
for (Method m : methods)
print(
String.format(
"%30s %15s %30s",
m.getReturnType(), m.getName(), Arrays.toString(m.getParameterTypes())));
Constructor[] constructors = cls.getConstructors();
print("List of contructors:");
for (Constructor c : constructors)
print(String.format("%30s %15s", c.getName(), Arrays.toString(c.getParameterTypes())));
}
public static void main(String[] args) throws Exception {
Class<?> clazzProxy1 = Proxy.getProxyClass(Collection.class.getClassLoader(), Collection.class);
System.out.println(clazzProxy1.getName());
System.out.println("----------begin constructors list----------");
/*$Proxy0()
$Proxy0(InvocationHandler,int)*/
Constructor<?>[] constructors = clazzProxy1.getConstructors();
for (Constructor<?> constructor : constructors) {
String name = constructor.getName();
StringBuilder sBuilder = new StringBuilder(name);
sBuilder.append('(');
Class<?>[] clazzParams = constructor.getParameterTypes();
for (Class<?> clazzParam : clazzParams) {
sBuilder.append(clazzParam.getName()).append(',');
}
if (clazzParams != null && clazzParams.length != 0)
sBuilder.deleteCharAt(sBuilder.length() - 1);
sBuilder.append(')');
System.out.println(sBuilder.toString());
}
System.out.println("----------begin methods list----------");
/*$Proxy0()
$Proxy0(InvocationHandler,int)*/
Method[] methods = clazzProxy1.getMethods();
for (Method method : methods) {
String name = method.getName();
StringBuilder sBuilder = new StringBuilder(name);
sBuilder.append('(');
Class<?>[] clazzParams = method.getParameterTypes();
for (Class<?> clazzParam : clazzParams) {
sBuilder.append(clazzParam.getName()).append(',');
}
if (clazzParams != null && clazzParams.length != 0)
sBuilder.deleteCharAt(sBuilder.length() - 1);
sBuilder.append(')');
System.out.println(sBuilder.toString());
}
System.out.println("----------begin create instance object----------");
// Object obj = clazzProxy1.newInstance();
Constructor<?> constructor = clazzProxy1.getConstructor(InvocationHandler.class);
class MyInvocationHander1 implements InvocationHandler {
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
return null;
}
}
Collection<?> proxy1 = (Collection<?>) constructor.newInstance(new MyInvocationHander1());
System.out.println(proxy1);
proxy1.clear();
// proxy1.size();
// System.out.println("111111111111111");
// Collection<?> proxy2 = (Collection<?>)constructor.newInstance(new InvocationHandler(){
//
// public Object invoke(Object proxy, Method method, Object[] args)
// throws Throwable {
// return null;
// }
//
// });
// final ArrayList<?> target = new ArrayList<Object>();
// Collection proxy3 = (Collection)getProxy(target,new MyAdvice());
// proxy3.add("zxx");
// proxy3.add("lhm");
// proxy3.add("bxd");
// System.out.println(proxy3.size());
// System.out.println(proxy3.getClass().getName());
}
/** Compares constructor signatures: names and parameters. */
public static boolean compareSignatures(Constructor first, Constructor second) {
if (first.getName().equals(second.getName()) == false) {
return false;
}
return compareParameters(first.getParameterTypes(), second.getParameterTypes());
}
private ParameterContext parameterContext(Parameter parameter) {
return new ParameterContext(parameter.getName(), parameter.getAnnotatedType(), single.getName())
.annotate(parameter);
}
public String[] parseJavaFileForParamNames(Constructor<?> constructor, String content) {
return parseJavaFileForParamNames(
content, constructor.getName(), constructor.getParameterTypes());
}
/** We're using constructor injection, create and populate a bean using a constructor */
private Object createUsingConstructorInjection(
Class<?> paramType, InboundVariable data, Map<String, String> tokens)
throws NoSuchMethodException, InstantiationException, IllegalAccessException,
InvocationTargetException {
Class<?> type;
if (instanceType != null) {
type = instanceType;
} else {
type = paramType;
}
// Find a constructor to match
List<Class<?>> parameterTypes = new ArrayList<Class<?>>();
for (Pair<Class<?>, String> parameter : parameters) {
parameterTypes.add(parameter.left);
}
Class<?>[] paramTypeArray = parameterTypes.toArray(new Class<?>[parameterTypes.size()]);
Constructor<?> constructor;
try {
constructor = type.getConstructor(paramTypeArray);
} catch (NoSuchMethodException ex) {
log.error(
"Can't find a constructor for " + type.getName() + " with params " + parameterTypes);
throw ex;
}
List<Object> arguments = new ArrayList<Object>();
int paramNum = 0;
for (Pair<Class<?>, String> parameter : parameters) {
String argument = tokens.get(parameter.right);
ConstructorProperty property =
new ConstructorProperty(constructor, parameter.right, paramNum);
Object output = convert(argument, parameter.left, data.getContext(), property);
arguments.add(output);
paramNum++;
}
// log.debug("Using constructor injection for: " + constructor);
Object[] argArray = arguments.toArray(new Object[arguments.size()]);
try {
return constructor.newInstance(argArray);
} catch (InstantiationException ex) {
log.error(
"Error building using constructor "
+ constructor.getName()
+ " with arguments "
+ argArray);
throw ex;
} catch (IllegalAccessException ex) {
log.error(
"Error building using constructor "
+ constructor.getName()
+ " with arguments "
+ argArray);
throw ex;
} catch (InvocationTargetException ex) {
log.error(
"Error building using constructor "
+ constructor.getName()
+ " with arguments "
+ argArray);
throw ex;
}
}
/** 根据类路径创建类实例 */
public static void getClassByFullName() {
String fullName = "com.cacard.javademo.Person2";
Class<?> c = null;
try {
c = Class.forName(fullName);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
try {
c.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
// 列出所有构造函数
Constructor<?> ctors[] = c.getConstructors();
for (Constructor<?> ctor : ctors) {
System.out.println(ctor.getName());
}
Object obj = null;
// 通过第1个构造函数创建实例
try {
obj = ctors[0].newInstance();
} catch (Exception e) {
e.printStackTrace();
}
// 通过第2个构造函数创建实例
try {
obj = ctors[1].newInstance("cacard", 1);
} catch (Exception e) {
e.printStackTrace();
}
// 显示所有方法
System.out.println("method list:");
Method[] methodList = c.getDeclaredMethods();
for (Method m : methodList) {
System.out.println(m.getName());
}
// 调用方法
try {
Method im =
c.getDeclaredMethod("staticMethodWithParams", new Class[] {String.class, int.class});
im.invoke(obj, "cacard", 2);
} catch (Exception e1) {
e1.printStackTrace();
}
// 通过索引调用方法
try {
methodList[2].invoke(obj);
} catch (Exception e) {
e.printStackTrace();
}
}
public String getName() {
return jConstructor.getName();
}