利用java反射输出对象的所有属性，调用对象的方法
public class ClassUtil {
private static final Logger logger = LoggerFactory.getLogger(ClassUtil.class);
public static final boolean isNull(String str){
if(str != null && !str.equals("")){
return false;
}
return true;
}
/**
* 20150729 输出对象的所有属性值
* */
public static String toString(Object obj){
String s = "";
try {
s = getPropertyString(obj);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return s;
}
public static String getPropertyString(Object entityName) throws Exception {
Class<? extends Object> c = entityName.getClass();
Field field [] = c.getDeclaredFields();
StringBuffer sb = new StringBuffer();
sb.append("------ " + " begin ------\n");
for(Field f : field){
sb.append(f.getName());
sb.append(" : ");
sb.append(invokeMethod(entityName,f.getName(),null));
sb.append("\n");
}
sb.append("------ " + " end ------\n");
return sb.toString();
}
public static Object invokeMethod(Object owner, String methodName, Object[] args) throws Exception{
Class<? extends Object> ownerClass = owner.getClass();
methodName = methodName.substring(0, 1).toUpperCase() + methodName.substring(1);
Method method = null;
try {
method = ownerClass.getMethod("get" + methodName);
} catch (SecurityException e) {
// TODO Auto-generated catch block
//e.printStackTrace();
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
//e.printStackTrace();
return " can't find 'get" + methodName + "' method";
}
return method.invoke(owner);
}
//20170217 从oss url地址中获取文件名
public static String getFileNameFromUrl(String fileUrl){
String fileName = "";
if(!ClassUtil.isNull(fileUrl)){
Integer index = fileUrl.lastIndexOf("/");
if(index>-1){
fileName = fileUrl.substring(index+1);
}
}
return fileName;
}
//20170221 若获取的变量为null 则返回空字符串
public static String dealStrWithNull(String str){
return (str == null? "":str);
}
//2017020 将oss url地址中的文件名进行编码后 如http://www.123.com/attachment/201702/20/20170220104327/test1+.jpg
//对url中的文件名进行utf-8编码 以防文件名中存在加号等特殊符号 导致附件无法下载
public static String encodeFileNameForUrl(String fileUrl) throws UnsupportedEncodingException{
String fileName = "";
if(!ClassUtil.isNull(fileUrl)){
Integer index = fileUrl.lastIndexOf("/");
if(index>-1){
String urlPrefix = fileUrl.substring(0,index+1);
fileName = fileUrl.substring(index+1);
fileName = URLEncoder.encode(fileName,"UTF-8");
fileUrl = urlPrefix + fileName;
}
}
return fileUrl;
}
//对oss url中的文件名进行utf-8解码 以防文件名中存在加号等特殊符号 导致附件无法下载
public static String decodeFileNameForUrl(String fileUrl) throws UnsupportedEncodingException{
String fileName = "";
if(!ClassUtil.isNull(fileUrl)){
Integer index = fileUrl.lastIndexOf("/");
if(index>-1){
String urlPrefix = fileUrl.substring(0,index+1);
fileName = fileUrl.substring(index+1);
fileName = URLDecoder.decode(fileName,"UTF-8");
fileUrl = urlPrefix + fileName;
}
}
return fileUrl;
}
/**
* 输出各个类型的字节数
* @param args
*/
private static void calSize() {
System.out.println("Integer: " + Integer.SIZE/8); // 4
System.out.println("Short: " + Short.SIZE/8); // 2
System.out.println("Long: " + Long.SIZE/8); // 8
System.out.println("Byte: " + Byte.SIZE/8); // 1
System.out.println("Character: " + Character.SIZE/8); // 2
System.out.println("Float: " + Float.SIZE/8); // 4
System.out.println("Double: " + Double.SIZE/8); // 8
System.out.println("Boolean: " + Boolean.toString(false));
}
/**
* 将输入字符串以十进制输出
* */
public static void hexToDecimal1() {
BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
String line;
try {
while((line = bufr.readLine()) != null) {
line = line.substring(2);//去掉0x前缀
int result = Integer.parseInt(line,16);
System.out.println(result);
}
}catch(IOException e) {
e.printStackTrace();
}
}
/**
* 将输入十六进制字符串以十进制输出
* */
public static void hexToDecimal() {
BufferedReader bufr = new BufferedReader(new InputStreamReader(System.in));
String line;
BigInteger base = new BigInteger("10");
try {
while((line = bufr.readLine()) != null) {
line = line.substring(2);//去掉0x前缀
//int result = Integer.parseInt(line,16);
BigInteger result = new BigInteger("0");
for(int i=0; i<line.length(); i++) {
char ch = line.charAt(line.length() - 1 - i);
if(ch >= 'A' && ch <= 'F') {
BigInteger tmp = base.pow(i).multiply(new BigInteger(Integer.toString(ch - 'A' + 10)));
result.add(tmp);
}else {
BigInteger tmp = base.pow(i).multiply(new BigInteger(Integer.toString(ch)));
result.add(tmp);
}
}
System.out.println(result);
}
}catch(IOException e) {
e.printStackTrace();
}
}
/**
* 获取利用反射获取类里面的值和名称
* @param obj
* @return
* @throws IllegalAccessException
*/
public static Map<String, Object> objectToMap(Object obj) throws IllegalAccessException {
Map<String, Object> map = new HashMap<>();
Class<?> clazz = obj.getClass();
System.out.println(clazz);
for (Field field : clazz.getDeclaredFields()) {
field.setAccessible(true);
String fieldName = field.getName();
Object value = field.get(obj);
map.put(fieldName, value);
}
return map;
}
/**
* 20181019 添加 调用dao方法 前后 添加日志
* @param owner 调用的对象或spring bean
* @param methodName 方法名
* @param args 参数map
* @return map
*/
public static Map<String, Object> invokeDaoMethod(Object owner, String methodName, HashMap<String, Object> args) throws Exception{
Class<? extends Object> ownerClass = owner.getClass();
logger.info("class[" + owner.getClass().getName() + "] - method[" + methodName + "]");
logger.info("ownerClass: ");
logger.info("owwnerClass is null? " + (ownerClass == null));
Method method = null;
try {
//method = ownerClass.getMethod(methodName,args.getClass());
method = ReflectionUtils.findMethod(ownerClass, methodName, args.getClass());
logger.info("method is null? " + (method == null));
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return objectToMap(ReflectionUtils.invokeMethod(method, owner, args));
}
public static void main(String[] args) {
// TODO Auto-generated method stub
hexToDecimal1();
}
}