Java程序工具之发射机制类信息打印器(Java版本)
[java]/**
* @author Sking
* 使用反射机制打印类信息
*/
package component.ReadAPI;
import java.lang.reflect.*;
import java.util.*;
public class GenericReflectionTest
{
public static void main(String[] args)
{
String name;
if (args.length > 0)
name = args[0];
else
{
Scanner in = new Scanner(System.in);
System.out.println("Enter class name (e.g. java.util.Date): ");
name = in.next();//从控制台读取指定类
}
try
{
Class<?> cl = Class.forName(name);//返回指定类对应的Class对象
printClass(cl);//打印类声明
for (Method m : cl.getDeclaredMethods())//打印类的所有方法
printMethod(m);
}
catch (ClassNotFoundException e)
{
e.printStackTrace();
}
}
public static void printClass(Class<?> cl)
{
System.out.print(cl);//打印类名,格式为:class 类的完全限定名
printTypes(cl.getTypeParameters(), "<", ", ", ">");//类的类型参数列表
Type sc = cl.getGenericSuperclass(); //返回直接父类的类型
if (sc != null)
{
System.out.print(" extends ");
printType(sc);
}
printTypes(cl.getGenericInte易做图ces(), " implements ", ", ", "");
System.out.println();
}
public static void printMethod(Method m)
{
String name = m.getName();//方法名
//打印访问修饰符标志的字符串
System.out.print(Modifier.toString(m.getModifiers()));
System.out.print(" ");
printTypes(m.getTypeParameters(), "<", ", ", "> ");//方法类型参数列表
printType(m.getGenericReturnType());//打印返回类型
System.out.print(" ");
System.out.print(name);//打印方法名
System.out.print("(");
printTypes(m.getGenericParameterTypes(), "", ", ", "");//形参类型列表
System.out.println(")");
}
/**
* 按照指定格式打印数组参数指定的类型列表
* @param types 类型数组
* @param pre 格式前缀
* @param sep 类型之间的分隔符
* @param suf 格式后缀
*/
public static void printTypes(Type[] types, String pre, String sep,
String suf)
{
if (types.length > 0) System.out.print(pre);//打印前缀
for (int i = 0; i < types.length; i++)
{
if (i > 0) System.out.print(sep);
printType(types[i]);
}
if (types.length > 0) System.out.print(suf);
}
public static void printType(Type type)
{
if (type instanceof Class) //对象类型
{
Class<?> t = (Class<?>) type;
System.out.print(t.getName());
}
else if (type instanceof TypeVariable)//类型变量
{
TypeVariable<?> t = (TypeVariable<?>) type;
System.out.print(t.getName());
printTypes(t.getBounds(), " extends ", " & ", "");
}
else if (type instanceof WildcardType)//通配符类型表达式
{
WildcardType t = (WildcardType) type;
System.out.print("?");
printTypes(t.getLowerBounds(), " extends ", " & ", "");
printTypes(t.getUpperBounds(), " super ", " & ", "");
}
else if (type instanceof ParameterizedType)//参数化类型
{
ParameterizedType t = (ParameterizedType) type;
Type owner = t.getOwnerType();
if (owner != null) { printType(owner); System.out.print("."); }
printType(t.getRawType());
printTypes(t.getActualTypeArguments(), "<", ", ", ">");
}
else if (type instanceof GenericArrayType)//数组类型
{
GenericArrayType t = (GenericArrayType) type;
System
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