Java通过JsApi方式实现微信支付

要使用JsApi进行微信支付，首先要从微信获得一个prepay_id，然后通过调用微信的jsapi完成支付，JS API的返回结果get_brand_wcpay_request:ok仅在用户成功完成支付时返回。由于前端交互复杂，get_brand_wcpay_request:cancel或者get_brand_wcpay_request:fail可以统一处理为用户遇到错误或者主动放弃，不必细化区分。
示例代码如下：

function onBridgeReady(){
WeixinJSBridge.invoke(
'getBrandWCPayRequest', {
"appId" : "wx2421b1c4370ec43b", //公众号名称，由商户传入
"timeStamp":" 1395712654", //时间戳，自1970年以来的秒数
"nonceStr" : "e61463f8efa94090b1f366cccfbbb444", //随机串
"package" : "u802345jgfjsdfgsdg888",
"signType" : "MD5", //微信签名方式:
"paySign" : "70EA570631E4BB79628FBCA90534C63FF7FADD89" //微信签名
},
function(res){
if(res.err_msg == "get_brand_wcpay_request:ok" ) {} // 使用以上方式判断前端返回,微信团队郑重提示：res.err_msg将在用户支付成功后返回 ok，但并不保证它绝对可靠。
}
);
}
if (typeof WeixinJSBridge == "undefined"){
if( document.addEventListener ){
document.addEventListener('WeixinJSBridgeReady', onBridgeReady, false);
}else if (document.attachEvent){
document.attachEvent('WeixinJSBridgeReady', onBridgeReady);
document.attachEvent('onWeixinJSBridgeReady', onBridgeReady);
}
}else{
onBridgeReady();
}

以上传入的参数package，即为prepay_id

下面讲的是获得参数来调用jsapi
我们调用JSAPI时，必须获得用户的openid，（trade_type=JSAPI，openid为必填参数。）
首先定义一个请求的对象：

package com.unstoppedable.protocol;
import com.unstoppedable.common.Configure;
import com.unstoppedable.common.HttpService;
import com.unstoppedable.common.RandomStringGenerator;
import com.unstoppedable.common.Signature;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
public class UnifiedOrderReqData {
private String appid;
private String mch_id;
private String device_info;
private String nonce_str;
private String sign;
private String body;
private String detail;
private String attach;
private String out_trade_no;
private String fee_type;
private int total_fee;
private String spbill_create_ip;
private String time_start;
private String time_expire;
private String goods_tag;
private String notify_url;
private String trade_type;
private String product_id;
private String limit_pay;
private String openid;
private UnifiedOrderReqData(UnifiedOrderReqDataBuilder builder) {
this.appid = builder.appid;
this.mch_id = builder.mch_id;
this.device_info = builder.device_info;
this.nonce_str = RandomStringGenerator.getRandomStringByLength(32);
this.body = builder.body;
this.detail = builder.detail;
this.attach = builder.attach;
this.out_trade_no = builder.out_trade_no;
this.fee_type = builder.fee_type;
this.total_fee = builder.total_fee;
this.spbill_create_ip = builder.spbill_create_ip;
this.time_start = builder.time_start;
this.time_expire = builder.time_expire;
this.goods_tag = builder.goods_tag;
this.notify_url = builder.notify_url;
this.trade_type = builder.trade_type;
this.product_id = builder.product_id;
this.limit_pay = builder.limit_pay;
this.openid = builder.openid;
this.sign = Signature.getSign(toMap());
}
public void setAppid(String appid) {
this.appid = appid;
}
public void setMch_id(String mch_id) {
this.mch_id = mch_id;
}
public void setDevice_info(String device_info) {
this.device_info = device_info;
}
public void setNonce_str(String nonce_str) {
this.nonce_str = nonce_str;
}
public void setSign(String sign) {
this.sign = sign;
}
public void setBody(String body) {
this.body = body;
}
public void setDetail(String detail) {
this.detail = detail;
}
public void setAttach(String attach) {
this.attach = attach;
}
public void setOut_trade_no(String out_trade_no) {
this.out_trade_no = out_trade_no;
}
public void setFee_type(String fee_type) {
this.fee_type = fee_type;
}
public void setTotal_fee(int total_fee) {
this.total_fee = total_fee;
}
public void setSpbill_create_ip(String spbill_create_ip) {
this.spbill_create_ip = spbill_create_ip;
}
public void setTime_start(String time_start) {
this.time_start = time_start;
}
public void setTime_expire(String time_expire) {
this.time_expire = time_expire;
}
public void setGoods_tag(String goods_tag) {
this.goods_tag = goods_tag;
}
public void setNotify_url(String notify_url) {
this.notify_url = notify_url;
}
public void setTrade_type(String trade_type) {
this.trade_type = trade_type;
}
public void setProduct_id(String product_id) {
this.product_id = product_id;
}
public void setLimit_pay(String limit_pay) {
this.limit_pay = limit_pay;
}
public void setOpenid(String openid) {
this.openid = openid;
}
public Map<String, Object> toMap() {
Map<String, Object> map = new HashMap<String, Object>();
Field[] fields = this.getClass().getDeclaredFields();
for (Field field : fields) {
Object obj;
try {
obj = field.get(this);
if (obj != null) {
map.put(field.getName(), obj);
}
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
}
}
return map;
}
public static class UnifiedOrderReqDataBuilder {
private String appid;
private String mch_id;
private String device_info;
private String body;
private String detail;
private String attach;
private String out_trade_no;
private String fee_type;
private int total_fee;
private String spbill_create_ip;
private String time_start;
private String time_expire;
private String goods_tag;
private String notify_url;
private String trade_type;
private String product_id;
private String limit_pay;
private String openid;
public UnifiedOrderReqDataBuilder(String appid, String mch_id, String body, String out_trade_no, Integer total_fee,
String spbill_create_ip, String notify_url, String trade_type) {
if (appid == null) {
throw new IllegalArgumentException("传入参数appid不能为null");
}
if (mch_id == null) {
throw new IllegalArgumentException("传入参数mch_id不能为null");
}
if (body == null) {
throw new IllegalArgumentException("传入参数body不能为null");
}
if (out_trade_no == null) {
throw new IllegalArgumentException("传入参数out_trade_no不能为null");
}
if (total_fee == null) {
throw new IllegalArgumentException("传入参数total_fee不能为null");
}
if (spbill_create_ip == null) {
throw new IllegalArgumentException("传入参数spbill_create_ip不能为null");
}
if (notify_url == null) {
throw new IllegalArgumentException("传入参数notify_url不能为null");
}
if (trade_type == null) {
throw new IllegalArgumentException("传入参数trade_type不能为null");
}
this.appid = appid;
this.mch_id = mch_id;
this.body = body;
this.out_trade_no = out_trade_no;
this.total_fee = total_fee;
this.spbill_create_ip = spbill_create_ip;
this.notify_url = notify_url;
this.trade_type = trade_type;
}
public UnifiedOrderReqDataBuilder setDevice_info(String device_info) {
this.device_info = device_info;
return this;
}
public UnifiedOrderReqDataBuilder setDetail(String detail) {
this.detail = detail;
return this;
}
public UnifiedOrderReqDataBuilder setAttach(String attach) {
this.attach = attach;
return this;
}
public UnifiedOrderReqDataBuilder setFee_type(String fee_type) {
this.fee_type = fee_type;
return this;
}
public UnifiedOrderReqDataBuilder setTime_start(String time_start) {
this.time_start = time_start;
return this;
}
public UnifiedOrderReqDataBuilder setTime_expire(String time_expire) {
this.time_expire = time_expire;
return this;
}
public UnifiedOrderReqDataBuilder setGoods_tag(String goods_tag) {
this.goods_tag = goods_tag;
return this;
}
public UnifiedOrderReqDataBuilder setProduct_id(String product_id) {
this.product_id = product_id;
return this;
}
public UnifiedOrderReqDataBuilder setLimit_pay(String limit_pay) {
this.limit_pay = limit_pay;
return this;
}
public UnifiedOrderReqDataBuilder setOpenid(String openid) {
this.openid = openid;
return this;
}
public UnifiedOrderReqData build() {
if("JSAPI".equals(this.trade_type) && this.openid == null) {
throw new IllegalArgumentException("当传入trade_type为JSAPI时，openid为必填参数");
}
if("NATIVE".equals(this.trade_type) && this.product_id == null) {
throw new IllegalArgumentException("当传入trade_type为NATIVE时，product_id为必填参数");
}
return new UnifiedOrderReqData(this);
}
}
}

因为有些参数为必填，有些参数为选填。而且sign要等所有参数传入之后才能计算的出，所以这里用了builder模式。关于builder模式。

我们选用httpclient进行网络传输。

package com.unstoppedable.common;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.io.xml.DomDriver;
import com.thoughtworks.xstream.io.xml.XmlFriendlyNameCoder;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.config.RequestConfig;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.conn.ConnectionPoolTimeoutException;
import org.apache.http.conn.ssl.SSLConnectionSocketFactory;
import org.apache.http.conn.ssl.SSLContexts;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
import javax.net.ssl.SSLContext;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.net.SocketTimeoutException;
import java.security.KeyStore;
/**
* Created by hupeng on 2015/7/28.
*/
public class HttpService {
private static Log logger = LogFactory.getLog(HttpService.class);
private static CloseableHttpClient httpClient = buildHttpClient();
//连接超时时间，默认10秒
private static int socketTimeout = 5000;
//传输超时时间，默认30秒
private static int connectTimeout = 5000;
private static int requestTimeout = 5000;
public static CloseableHttpClient buildHttpClient() {
try {
KeyStore keyStore = KeyStore.getInstance("PKCS12");
FileInputStream instream = new FileInputStream(new File(Configure.getCertLocalPath()));//加载本地的证书进行https加密传输
try {
keyStore.load(instream, Configure.getCertPassword().toCharArray());//设置证书密码
} finally {
instream.close();
}
// Trust own CA and all self-signed certs
SSLContext sslcontext = SSLContexts.custom()
.loadKeyMaterial(keyStore, Configure.getCertPassword().toCharArray())
.build();
// Allow TLSv1 protocol only
SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(
sslcontext,
new String[]{"TLSv1"},
null,
SSLConnectionSocketFactory.BROWSER_COMPATIBLE_HOSTNAME_VERIFIER);
RequestConfig requestConfig = RequestConfig.custom()
.setConnectTimeout(connectTimeout)
.setConnectionRequestTimeout(requestTimeout)
.setSocketTimeout(socketTimeout).build();
httpClient = HttpClients.custom()
.setDefaultRequestConfig(requestConfig)
.setSSLSocketFactory(sslsf)
.build();
return httpClient;
} catch (Exception e) {
throw new RuntimeException("error create httpclient......", e);
}
}
public static String doGet(String requestUrl) throws Exception {
HttpGet httpget = new HttpGet(requestUrl);
try {
logger.debug("Executing request " + httpget.getRequestLine());
// Create a custom response handler
ResponseHandler<String> responseHandler = new ResponseHandler<String>() {
@Override
public String handleResponse(
final HttpResponse response) throws ClientProtocolException, IOException {
int status = response.getStatusLine().getStatusCode();
if (status >= 200 && status < 300) {
HttpEntity entity = response.getEntity();
return entity != null ? EntityUtils.toString(entity) : null;
} else {
throw new ClientProtocolException("Unexpected response status: " + status);
}
}
};
return httpClient.execute(httpget, responseHandler);
} finally {
httpget.releaseConnection();
}
}
public static String doPost(String url, Object object2Xml) {
String result = null;
HttpPost httpPost = new HttpPost(url);
//解决XStream对出现双下划线的bug
XStream xStreamForRequestPostData = new XStream(new DomDriver("UTF-8", new XmlFriendlyNameCoder("-_", "_")));
//将要提交给API的数据对象转换成XML格式数据Post给API
String postDataXML = xStreamForRequestPostData.toXML(object2Xml);
logger.info("API，POST过去的数据是：");
logger.info(postDataXML);
//得指明使用UTF-8编码，否则到API服务器XML的中文不能被成功识别
StringEntity postEntity = new StringEntity(postDataXML, "UTF-8");
httpPost.addHeader("Content-Type", "text/xml");
httpPost.setEntity(postEntity);
//设置请求器的配置
logger.info("executing request" + httpPost.getRequestLine());
try {
HttpResponse response = httpClient.execute(httpPost);
HttpEntity entity = response.getEntity();
result = EntityUtils.toString(entity, "UTF-8");
} catch (ConnectionPoolTimeoutException e) {
logger.error("http get throw ConnectionPoolTimeoutException(wait time out)", e);
} catch (ConnectTimeoutException e) {
logger.error("http get throw ConnectTimeoutException", e);
} catch (SocketTimeoutException e) {
logger.error("http get throw SocketTimeoutException", e);
} catch (Exception e) {
logger.error("http get throw Exception", e);
} finally {
httpPost.abort();
}
return result;
}
}

然后是我们的总入口：

package com.unstoppedable.service;
import com.unstoppedable.common.Configure;
import com.unstoppedable.common.HttpService;
import com.unstoppedable.common.XMLParser;
import com.unstoppedable.protocol.UnifiedOrderReqData;
import org.xml.sax.SAXException;
import javax.xml.parsers.ParserConfigurationException;
import java.io.IOException;
import java.util.Map;
/**
* Created by hupeng on 2015/7/28.
*/
public class WxPayApi {
public static Map<String,Object> UnifiedOrder(UnifiedOrderReqData reqData) throws IOException, SAXException, ParserConfigurationException {
String res = HttpService.doPost(Configure.UNIFIED_ORDER_API, reqData);
return XMLParser.getMapFromXML(res);
}
public static void main(String[] args) throws Exception {
UnifiedOrderReqData reqData = new UnifiedOrderReqData.UnifiedOrderReqDataBuilder("appid", "mch_id", "body", "out_trade_no", 1, "spbill_create_ip", "notify_url", "JSAPI").setOpenid("openid").build();
System.out.println(UnifiedOrder(reqData));
}
}

返回的xml为：

<xml>
<return_code><![CDATA[SUCCESS]]></return_code>
<return_msg><![CDATA[OK]]></return_msg>
<appid><![CDATA[wx2421b1c4370ec43b]]></appid>
<mch_id><![CDATA[10000100]]></mch_id>
<nonce_str><![CDATA[IITRi8Iabbblz1Jc]]></nonce_str>
<sign><![CDATA[7921E432F65EB8ED0CE9755F0E86D72F]]></sign>
<result_code><![CDATA[SUCCESS]]></result_code>
<prepay_id><![CDATA[wx201411101639507cbf6ffd8b0779950874]]></prepay_id>
<trade_type><![CDATA[JSAPI]]></trade_type>
</xml>

return_code 和result_code都为SUCCESS的时候会返回我们需要的prepay_id。。。，然后在jsapi中使用他就可以了。。

本文已被整理到了《JavaScript微信开发技巧汇总》，《Android微信开发教程汇总》，《java微信开发教程汇总》欢迎大家学习阅读。

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