Sax解析遇到&字符，会分段，如1&2；会分成三段1，&，2；在赋值时加判断即可

public void setMs(String ms) {
	if ("&".equals(ms)) {
		this.ms += ms;
		append = true;
		return;
	}  
		if (append) {
		this.ms += ms;
		append = false;
	} else {
		this.ms = ms;
	}
}