利用Java的反射机制解析一个Class对象的详细内容（工具方法留用）

       

public static void printClassDefinition(Class clz) {

  String clzModifier = getModifier(clz.getModifiers());
  if (clzModifier != null && !clzModifier.equals("")) {
   clzModifier = clzModifier + " ";
  }
  String superClz = clz.getSuperclass().getName();
  if (superClz != null && !superClz.equals("")) {
   superClz = "extends " + superClz;
  }

  Class[] interfaces = clz.getInterfaces();

  String inters = "";
  for (int i = 0; i < interfaces.length; i++) {
   if (i == 0) {
    inters += "implements ";
   }
   inters += interfaces[i].getName();
  }

  System.out.println(clzModifier + clz.getName() + " " + superClz + " "
    + inters);
  System.out.println("{");

  Field[] fields = clz.getDeclaredFields();
  for (int i = 0; i < fields.length; i++) {
   String modifier = getModifier(fields[i].getModifiers());
   if (modifier != null && !modifier.equals("")) {
    modifier = modifier + " ";
   }
   String fieldName = fields[i].getName();
   String fieldType = fields[i].getType().getName();
   System.out.println("    " + modifier + fieldType + " " + fieldName
     + ";");
  }

  System.out.println();

  Method[] methods = clz.getDeclaredMethods();
  for (int i = 0; i < methods.length; i++) {
   Method method = methods[i];

   String modifier = getModifier(method.getModifiers());
   if (modifier != null && !modifier.equals("")) {
    modifier = modifier + " ";
   }

   String methodName = method.getName();

   Class returnClz = method.getReturnType();
   String retrunType = returnClz.getName();

   Class[] clzs = method.getParameterTypes();
   String paraList = "(";
   for (int j = 0; j < clzs.length; j++) {
    paraList += clzs[j].getName();
    if (j != clzs.length - 1) {
     paraList += ", ";
    }
   }
   paraList += ")";

   clzs = method.getExceptionTypes();
   String exceptions = "";
   for (int j = 0; j < clzs.length; j++) {
    if (j == 0) {
     exceptions += "throws ";
    }

    exceptions += clzs[j].getName();

    if (j != clzs.length - 1) {
     exceptions += ", ";
    }
   }

   exceptions += ";";

   String methodPrototype = modifier + retrunType + " " + methodName
     + paraList + exceptions;

   System.out.println("    " + methodPrototype);

  }
  System.out.println("}");
 }

 public static String getModifier(int modifier) {
  String result = "";
  switch (modifier) {
  case Modifier.PRIVATE:
   result = "private";
  case Modifier.PUBLIC:
   result = "public";
  case Modifier.PROTECTED:
   result = "protected";
  case Modifier.ABSTRACT:
   result = "abstract";
  case Modifier.FINAL:
   result = "final";
  case Modifier.NATIVE:
   result = "native";
  case Modifier.STATIC:
   result = "static";
  case Modifier.SYNCHRONIZED:
   result = "synchronized";
  case Modifier.STRICT:
   result = "strict";
  case Modifier.TRANSIENT:
   result = "transient";
  case Modifier.VOLATILE:
   result = "volatile";
  case Modifier.INTERFACE:
   result = "interface";
  }
  return result;
 }