|
自己寫了個(gè)工具類,，大家給點(diǎn)意見：可以查看類的詳細(xì)信息的,。 package mycom; import java.lang.reflect.*; /** * the tools of looking for the properties of a class * print the constructor and method * * @author Roy * @since 2007-09-10 * @version 1.0 */ public class GetProperties { /** * return the parameters of the specified methods,constructors or fields fit * the jdk1.4 * * @param acceObject AccessibleObject * @return * @author Roy */ private static String getParameter(AccessibleObject acceObject) { String result = ""; Class[] parameters = null; if (acceObject instanceof Method) { parameters = ((Method) acceObject).getParameterTypes(); } if (acceObject instanceof Constructor) { parameters = ((Constructor) acceObject).getParameterTypes(); } int paramCount = parameters.length; // if no parameters if (paramCount < 1) { return result; } StringBuffer str = new StringBuffer(); for (int i = 0; i < paramCount; i++) { String s = parameters[i].getName();// generally,the s is contain str.append(getShortName(s)).append(","); } if (str.length() > 1)//delete the last "," result = str.substring(0, str.length() - 1); return result; } /** * print the field * @param object Class */ public static void printFields(Class object){ System.out .println("----------------------Fileds----------------------"); StringBuffer str = new StringBuffer(); Field[] field = object.getDeclaredFields(); for(int i=0;i<field.length; i++){ int type =field[i].getModifiers(); str.append(Modifier.toString(type)).append(" "); Class declared =field[i].getType(); str.append(getShortName(declared.getName())).append(" "); str.append(field[i].getName()).append("\n"); //str.append(field[i].get(field.[i]).toString()).append("\n"); //System.out.println(field[i].toString()); } System.out.print(str.toString()); } /** * print the construct function and its parameters * * @param object Class * @return */ public static void printConstructs(Class object) { System.out .println("----------------------Constructors----------------------"); Constructor[] cos = object.getConstructors(); for (int i = 0; i < cos.length; i++) { System.out.print(cos[i].getName() + "("); System.out.print(getParameter(cos[i])); System.out.print(")" + "\n"); } } /** * print the declared method and its parameter * * @param object Class */ public static void printMethods(Class object) { System.out .println("----------------------Methods----------------------"); StringBuffer str = new StringBuffer(); Method[] methods = object.getDeclaredMethods(); for (int i = 0; i < methods.length; i++) { int type = methods[i].getModifiers();// Returns the Java language // modifiers // The Modifier class should be used to decode the modifiers if(type != 0) str.append(Modifier.toString(type)).append(" "); str.append(getShortName(methods[i].getReturnType().getName())) .append(" "); str.append(methods[i].getName()).append("(").append( getParameter(methods[i])); str.append(")").append("\n"); } System.out.println(str); } /** * if the return type is a array,the str is "[*", for example the * function" int[] getNumber(){..}" the * "methods[i].getReturnType().getName()" equals "[I" * * @param str String */ private static String getShortName(String str) { StringBuffer result = new StringBuffer(); int i = -50; if (str.indexOf("[") != -1) {//array type if (str.length() == 2) { switch (str.charAt(1)) { case 'B': result.append("byte[]"); break; case 'S': result.append("short[]"); break; case 'I': result.append("int[]"); break; case 'C': result.append("char[]"); break; case 'J': result.append("long[]"); break; case 'F': result.append("float[]"); break; case 'D': result.append("double[]"); break; } } else { if ((i = str.lastIndexOf(".")) != -1) {//because the end of the str is ";" result.append(str.substring(i + 1,str.length()-1)).append("[]"); } } } else {//no array type if ((i = str.lastIndexOf(".")) != -1) { return str.substring(i + 1); } return str; } return result.toString(); } public static void main(String[] args) throws Exception { if(args.length<1){ StringBuffer str=new StringBuffer(); str.append("usage:java GetProperties ARGS").append("\n"); str.append(" the args contain the package:").append("\n"); str.append(" example: java GetProperties java.lang.String"); System.out.println(str.toString()); System.exit(0); } //test: //Class object = Class.forName("java.lang.reflect.Modifier"); Class object = Class.forName(args[0]); printFields(object); printConstructs(object); printMethods(object); } } |
|
|
