/** 
   * 商戶服務器生成支付訂單，先調(diào)用統(tǒng)一下單API(詳見第7節(jié))生成預付單，獲取到prepay_id后將參數(shù)再次簽名傳輸給APP發(fā)起支付。 
   */ 
  //商品描述 
  String body = "iphone6s"; 
  //隨機字符串 
  String nonce_str = ResourceUtil.createRandomString(32); 
  //通知地址 
  String notify_url = "http://www.weixin.qq.com/wxpay/pay.php"; 
  //商戶訂單號 
  String out_trade_no = ResourceUtil.generateOutTradeNo(32); 
  //總金額(單位分) 
  int total_fee = 1; 
   
  String url = "https://api.mch.weixin.qq.com/pay/unifiedorder"; 
   
  String sign = SignUtil.signByMD5("appid=" + Constants.APP_ID + "&body=" + body + 
    "&mch_id=" + Constants.MCH_ID + "&nonce_str=" + nonce_str + "¬ify_url=" + notify_url + 
     "&out_trade_no=" + out_trade_no + "&spbill_create_ip=127.0.0.1" + 
    "&total_fee=" + total_fee + "&trade_type=APP" + "&key=" + Constants.KEY).toUpperCase(Locale.getDefault()); 
   
  //參數(shù)以xml格式傳遞 
  String entity = "<xml><appid>" + Constants.APP_ID + "</appid><mch_id>" + Constants.MCH_ID + "</mch_id><nonce_str>" + nonce_str +"</nonce_str><sign>" + sign + 
    "</sign><body>" + body + "</body><out_trade_no>" + out_trade_no + "</out_trade_no><total_fee>" + total_fee + 
    "</total_fee><spbill_create_ip>127.0.0.1</spbill_create_ip><notify_url>http://www.weixin.qq.com/wxpay/pay.php</notify_url><trade_type>APP</trade_type></xml>";  
   
  Log.d("entity", entity); 
  payButton.setEnabled(false); 
  Toast.makeText(PayActivity.this, "獲取訂單中...", Toast.LENGTH_SHORT).show(); 
   
  byte[] buf = Util.httpPost(url, entity); 
  if (buf != null && buf.length > 0) { 
   String content = new String(buf); 
   Log.d("get server pay params:", content); 
    
   OrderResult orderResult = ResourceUtil.parseXml(new ByteArrayInputStream(content.getBytes())); 
   
   if (!TextUtils.equals(orderResult.getReturnCode(), "SUCCESS")) { 
    Toast.makeText(PayActivity.this, orderResult.getReturnMsg(), Toast.LENGTH_SHORT).show(); 
    return; 
   } 
    
   if (!TextUtils.equals(orderResult.getResultCode(), "SUCCESS")) { 
    Toast.makeText(PayActivity.this, orderResult.getErrorDesc(), Toast.LENGTH_SHORT).show(); 
    return; 
   } 
    
   //下單成功，調(diào)起支付 
   PayReq request = new PayReq(); 
   request.appId = Constants.APP_ID; 
   request.partnerId = Constants.MCH_ID; 
   request.prepayId = orderResult.getPrepayId(); 
   request.packageValue = "Sign=WXPay"; 
   request.nonceStr = nonce_str; 
    
   String timeStamp = String.valueOf(System.currentTimeMillis() / 1000); 
   request.timeStamp = timeStamp; 
   request.sign = SignUtil.signByMD5("appid=" + Constants.APP_ID + "&noncestr=" + nonce_str + "&package=Sign=WXPay" + 
     "&partnerid=" + Constants.MCH_ID + "&prepayid=" + orderResult.getPrepayId() + "×tamp=" + timeStamp + "&key=" + Constants.KEY).toUpperCase(Locale.getDefault()); 
    
   api.sendReq(request); 
    
   payButton.setEnabled(true); 
  } 
 } 
});

相關參數(shù)說明在文檔上都注明了，我這里面nonce_str和out_trade_no都是我隨機生成的字符創(chuàng)，附上我的工具類，方便大家參考。

ResourceUtil.java

package com.xylpay.sdk.pay.uikit; 
 
import java.io.IOException; 
import java.io.InputStream; 
import java.util.Random; 
 
import org.xmlpull.v1.XmlPullParser; 
import org.xmlpull.v1.XmlPullParserException; 
 
import com.xylpay.sdk.pay.bean.OrderResult; 
 
import android.util.Xml; 
 
public class ResourceUtil { 
  
 /** 
  * 隨機生成字符串 
  * @param length 字符串的長度 
  * @return  隨機字符串 
  */ 
 public static String createRandomString(int length) { 
  String source = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; 
  Random random = new Random(); 
  StringBuilder builder = new StringBuilder(); 
  for (int i = 0; i < length; i++) { 
   int position = random.nextInt(source.length()); 
   builder.append(source.charAt(position)); 
  } 
 
  return builder.toString(); 
 } 
  
 public static String generateOutTradeNo(int n) { 
  StringBuilder builder = new StringBuilder(); 
  Random random = new Random(); 
  for (int i = 0; i < n; i++) { 
   builder.append(random.nextInt(10)); 
  } 
 
  return builder.toString(); 
 } 
  
 public static OrderResult parseXml(InputStream is) { 
  //PULL解析xml數(shù)據(jù) 
  XmlPullParser parser = Xml.newPullParser(); 
  OrderResult orderResult = null; 
  try { 
   parser.setInput(is, "UTF-8"); 
   int type = parser.getEventType(); 
   while(type != XmlPullParser.END_DOCUMENT) { 
    switch (type) { 
    case XmlPullParser.START_DOCUMENT: 
     break; 
    case XmlPullParser.START_TAG: 
     if (parser.getName().equals("xml")) { 
      orderResult = new OrderResult(); 
     } else if (parser.getName().equals("return_code")) { 
      orderResult.setReturnCode(parser.nextText()); 
     } else if (parser.getName().equals("return_msg")) { 
      orderResult.setReturnMsg(parser.nextText()); 
     } else if (parser.getName().equals("result_code")) { 
      orderResult.setResultCode(parser.nextText()); 
     } else if (parser.getName().equals("err_code_des")) { 
      orderResult.setErrorDesc(parser.nextText()); 
     } else if (parser.getName().equals("prepay_id")) { 
      orderResult.setPrepayId(parser.nextText()); 
     } 
     break; 
    case XmlPullParser.END_TAG: 
     break; 
    } 
     
    type = parser.next(); 
   } 
  } catch(XmlPullParserException e) { 
   e.printStackTrace(); 
  } catch (IOException e) { 
   e.printStackTrace(); 
  } 
   
  return orderResult; 
 } 
}

其中關于sign的生成，參數(shù)的順序一定要嚴格按照上面的順序加上key進行MD5加密，查看簽名規(guī)范。
關于key的說明，這里的key是需要自己生成然后配置到微信開放平臺的，參考商戶支付密鑰key的生成與設置進行配置，兩邊需要保持一致。另外，下單時，參數(shù)要以xml的格式來傳遞。

最后附上自己的簽名算法：

SignUtil.java

package com.xylpay.sdk.pay.uikit; 
 
import java.security.MessageDigest; 
import java.security.NoSuchAlgorithmException; 
 
/** 
 * Created by Jackie on 2016/2/15. 
 * * MD5加密 
 */ 
public class SignUtil { 
 public static String signByMD5(String source) { 
  byte[] bytes = null; 
  try { 
   MessageDigest digest = MessageDigest.getInstance("MD5"); 
   digest.update(source.getBytes()); //更新摘要 
 
   bytes = digest.digest(); //再通過執(zhí)行諸如填充之類的最終操作完成哈希計算。在調(diào)用此方法之后，摘要被重置。 
  } catch (NoSuchAlgorithmException e) { 
   e.printStackTrace(); 
  } 
 
  StringBuilder builder = new StringBuilder(bytes.length * 2); 
  for (byte b : bytes) { 
   /** 
    * 0xFF默認是整形，一個byte跟0xFF相與會先將那個byte轉化成整形運算 
    */ 
   if ((b & 0xFF) < 0x10) { //如果為1位 前面補個0 
    builder.append("0"); 
   } 
 
   builder.append(Integer.toHexString(b & 0xFF)); 
  } 
 
  return builder.toString(); 
 } 
}

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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