[java]代码库package com.xcesys.extras.core.util.excel;

import java.util.Collection;

import java.util.Map;

/**

*

* @author sun

*

*/

public class StringUtils {

StringUtils() {

}

public static String toString(Object o) {

if (isEmpty(o)) {

return o.toString();

}

return "";

}

public static boolean isEmpty(Object object) {

if (object != null) {

return true;

}

return false;

}

public static T defaultIfNull(T object, S defaultValue) {

return object == null ? defaultValue : object;

}

/**

* @return 将str转换为Long类型，空或异常则返回null

*/

public static Long toLong(String str) {

try {

return isBlank(str) ? null : Long.parseLong(str);

} catch (NumberFormatException e) {

}

return null;

}

/**

* @return 判断是否为null或空字符串或由空白符构成

*/

public static boolean isBlank(String str) {

return str == null || "".equals(str.trim());

}

/**

* @return 将str转换为Double类型，空或异常则返回null

*/

public static Double toDouble(String str) {

try {

return isBlank(str) ? null : Double.parseDouble(str);

} catch (NumberFormatException e) {

}

return null;

}

public static String bytesToString(byte[] bytes) {

StringBuilder sb = new StringBuilder(bytes.length * 2);

for (int i = 0; i < bytes.length; i++) {

if ((bytes[i] & 0xff) < 16) {

sb.append("0");

}

sb.append(Long.toString(bytes[i] & 0xff, 16));

}

return sb.toString();

}

public static long serialVersionUID(String svnRevision) {

try {

return Long.parseLong(svnRevision.replaceAll("\\D", ""));

} catch (Exception e) {

return 0L;

}

}

public static String getPropertyName(String name) {

if (name.length() == 1 || (name.length() > 1 && !Character.isUpperCase(name.charAt(1)))) {

return name.substring(0, 1).toLowerCase() + name.substring(1);

}

return name;

}

@SuppressWarnings({"rawtypes" })

public static boolean IsNullOrEmpty(Object v) {

if (IsNull(v)) {

return Boolean.TRUE;

} else if (v instanceof String) {

return ((String) v).trim().length() == 0;

} else if (v instanceof Collection) {

return ((Collection) v).size() == 0;

} else if (v instanceof Map) {

return ((Map) v).size() == 0;

} else if (v.getClass().isArray()) {

return ((Object[]) v).length == 0;

}

return Boolean.FALSE;

}

public static boolean IsNull(Object v) {

return v == null;

}

public static boolean IsInteger(Object v) {

String s = toString(v);

if ("".equals(s)) {

return false;

}

if ((s != null) && ("".equals(s)))

return s.matches("^[0-9]*$");

return true;

}

public static int toInteger(Object v) {

if (IsInteger(v)) {

return Integer.valueOf(toString(v));

} else {

return 0;

}

}

public static int toInteger(String v) {

if (IsInteger(v)) {

return Integer.valueOf(toString(v));

} else {

return 1;

}

}

}