微信支付订单生产方法：

    /*** 根据您的订单信息 生成 微信产品支付订单信息*/private String createWeChatOrder() {StringBuffer xml = new StringBuffer();try {String nonceStr = genNonceStr();xml.append("</xml>");List<KeyValue> packageParams = new LinkedList<KeyValue>();packageParams.add(new KeyValue("appid", APP_ID));packageParams.add(new KeyValue("attach", orderType));packageParams.add(new KeyValue("body", "天鑫计费-网吧充值"));packageParams.add(new KeyValue("mch_id", MCH_ID));packageParams.add(new KeyValue("nonce_str", nonceStr));packageParams.add(new KeyValue("notify_url", callBackUrl));packageParams.add(new KeyValue("out_trade_no", orderOn));packageParams.add(new KeyValue("spbill_create_ip", "127.0.0.1"));packageParams.add(new KeyValue("total_fee", getTotalFee(price)));// packageParams.add(new KeyValue("total_fee", price));packageParams.add(new KeyValue("trade_type", "APP"));String sign = genPackageSign(packageParams);packageParams.add(new KeyValue("sign", sign));String xmlstring = toXml(packageParams);return xmlstring;//            return new String(xmlstring.toString().getBytes(), "ISO8859-1");// return xmlstring;} catch (Exception e) {return null;}}

使用中文body报错：签名错误解决方法：

直接返回xmlstring即可。不需要添加字符格式“ISO8859-1”