toString 方法

	@Override
	public String toString() {
		StringBuilder buf = new StringBuilder();
		Method[] methods = this.getClass().getMethods();
		boolean isFirst = true;
		for (int i = 0, n = methods.length; i < n; i++) {
			try {
				Method method = methods[i];
				if ((method.getModifiers() & Modifier.PUBLIC) == 1
						&& method.getDeclaringClass() != Object.class
						&& (method.getParameterTypes() == null || method
								.getParameterTypes().length == 0)) {
					String methodName = method.getName();
					String property = null;
					if (methodName.startsWith("get")) {
						property = methodName.substring(3, 4).toLowerCase()
								+ methodName.substring(4);
					} else if (methodName.startsWith("is")) {
						property = methodName.substring(2, 3).toLowerCase()
								+ methodName.substring(3);
					}
					if (property != null) {
						Object value = method.invoke(this, new Object[0]);
						if (isFirst)
							isFirst = false;
						else
							buf.append(",");
						buf.append(property);
						buf.append(":");
						if (value instanceof String)
							buf.append("\"");
						buf.append(value);
						if (value instanceof String)
							buf.append("\"");
					}
				}
			} catch (Exception e) {
				// ignore
			}
		}
		return "{" + buf.toString() + "}";
	}