字符串转为驼峰工具类

public static String str2hump(String str) {
		StringBuffer buffer = new StringBuffer();
		if (str != null && str.length() > 0) {
			if (str.contains("_")) {
				String[] chars = str.split("_");
				int size = chars.length;
				if (size > 0) {
					List<String> list = Lists.newArrayList();
					for (String s : chars) {
						if (s != null && s.trim().length() > 0) {
							list.add(s);
						}
					}

					size = list.size();
					if (size > 0) {
						buffer.append(list.get(0));
						for (int i = 1; i < size; i++) {
							String s = list.get(i);
							buffer.append(s.substring(0, 1).toUpperCase());
							if (s.length() > 1) {
								buffer.append(s.substring(1));
							}
						}
					}
				}
			} else {
				buffer.append(str);
			}
		}

		return buffer.toString();
	}