热敏式 打印机 小票排版

private int width = 32;//纸张宽度
private int defaultRightSpacing = 16; //数量开始位置最后的宽度
private int rightSpacing = defaultRightSpacing; //数量据左边的距离
private int leftSpacing = width - defaultRightSpacing; //数量据右边的距离
private int defaultLeftSpacing = width - defaultRightSpacing;
private String getGoodDetails(List<OrderBean.DetailsBean> detailsBeen) throws UnsupportedEncodingException {

StringBuffer sbf = new StringBuffer("");
for (int i = 0; i < detailsBeen.size(); i++) {
OrderBean.DetailsBean d = detailsBeen.get(i);
String name = d.getProductName();
if(name.length() > 8){
name = name.substring(0, 8);
}
String number = "x" + d.getNumber();
String price = "￥" + d.getPayAmount();
leftSpacing = defaultLeftSpacing - name.getBytes("gbk").length;
rightSpacing = defaultRightSpacing - price.getBytes("gbk").length - number.getBytes("gbk").length;
sbf.append(name);
for (int j = 0; j < leftSpacing; j++) {//添加距左边的位置
sbf.append(" ");
}
sbf.append(number);
//            oneLeftSpacing = sbf.toString().indexOf("x");
for (int j = 0; j < rightSpacing; j++) {//添加距左边的位置
sbf.append(" ");
}
sbf.append(price);
sbf.append("\n");
}
return sbf.toString();
}