昨天搞定了微信支付,没有想象中的难,主要是官方的demo不全好多东西要自己琢磨,mui端的就不写了支付宝的有了一模一样.上java端的首先是jar包

一个是用来解析xml文件

一个是用来解析json

当然可以替代

然后是工具类当然并不是全都用的到.

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public class ConfigUtil {

/**
* 服务号相关信息
*/
public final static String APPID = "****";// 服务号的应用号
public final static String MCH_ID = "*****";// 商户号
public final static String API_KEY = "******";// API密钥
public final static String SIGN_TYPE = "MD5";// 签名加密方式

public final static String UNIFIED_ORDER_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder";

}

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/**
* md5加密
*
* @author Administrator
*
*/
public class MD5Util {

private static String byteArrayToHexString(byte b[]) {
StringBuffer resultSb = new StringBuffer();
for (int i = 0; i < b.length; i++)
resultSb.append(byteToHexString(b[i]));

return resultSb.toString();
}

private static String byteToHexString(byte b) {
int n = b;
if (n < 0)
n += 256;
int d1 = n / 16;
int d2 = n % 16;
return hexDigits[d1] + hexDigits[d2];
}

public static String MD5Encode(String origin, String charsetname) {
String resultString = null;
try {
resultString = new String(origin);
MessageDigest md = MessageDigest.getInstance("MD5");
if (charsetname == null || "".equals(charsetname))
resultString = byteArrayToHexString(md.digest(resultString
.getBytes()));
else
resultString = byteArrayToHexString(md.digest(resultString
.getBytes(charsetname)));
} catch (Exception exception) {
}
return resultString;
}

private static final String hexDigits[] = { "0", "1", "2", "3", "4", "5",
"6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

}

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/**
* 信任管理器
*/
public class MyX509TrustManager implements X509TrustManager {

// 检查客户端证书
public void checkClientTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
}

// 检查服务器端证书
public void checkServerTrusted(X509Certificate[] chain, String authType)
throws CertificateException {
}

// 返回受信任的X509证书数组
public X509Certificate[] getAcceptedIssuers() {
return null;
}

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/**
* 解析mxl
*
* @author Administrator
*
*/
public class XMLUtil {
/**
* 解析xml,返回第一级元素键值对。如果第一级元素有子节点，则此节点的值是子节点的xml数据。
*
* @param strxml
* @return
* @throws JDOMException
* @throws IOException
*/
public static Map doXMLParse(String strxml) throws JDOMException,
IOException {
strxml = strxml.replaceFirst("encoding=\".*\"", "encoding=\"UTF-8\"");

if (null == strxml || "".equals(strxml)) {
return null;
}

Map m = new HashMap();

InputStream in = new ByteArrayInputStream(strxml.getBytes("UTF-8"));
SAXBuilder builder = new SAXBuilder();
Document doc = builder.build(in);
Element root = doc.getRootElement();
List list = root.getChildren();
Iterator it = list.iterator();
while (it.hasNext()) {
Element e = (Element) it.next();
String k = e.getName();
String v = "";
List children = e.getChildren();
if (children.isEmpty()) {
v = e.getTextNormalize();
} else {
v = XMLUtil.getChildrenText(children);
}

m.put(k, v);
}

// 关闭流
in.close();

return m;
}

/**
* 获取子结点的xml
*
* @param children
* @return String
*/
public static String getChildrenText(List children) {
StringBuffer sb = new StringBuffer();
if (!children.isEmpty()) {
Iterator it = children.iterator();
while (it.hasNext()) {
Element e = (Element) it.next();
String name = e.getName();
String value = e.getTextNormalize();
List list = e.getChildren();
sb.append("<" + name + ">");
if (!list.isEmpty()) {
sb.append(XMLUtil.getChildrenText(list));
}
sb.append(value);
sb.append("</" + name + ">");
}
}

return sb.toString();
}

}

===============================================================================================================

/**
* 支付公共工具
*
* @author Administrator
*
*/
public class PayCommonUtil {

/**
* 创建临时字符串
*
* @param length
* 创建长度
* @return 该长度的随机字符串
*/
public static String CreateNoncestr(int length) {
String chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
String res = "";
for (int i = 0; i < length; i++) {
Random rd = new Random();
res += chars.indexOf(rd.nextInt(chars.length() - 1));
}
return res;
}

/**
* 创建随机字符串16位
*
* @return
*/
public static String CreateNoncestr() {
String chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
String res = "";
for (int i = 0; i < 16; i++) {
Random rd = new Random();
res += chars.charAt(rd.nextInt(chars.length() - 1));
}
return res;
}

/**
* 是否签名正确,规则是:按参数名称a-z排序,遇到空值的参数不参加签名。
*
* @return boolean
*/
public static boolean isTenpaySign(String characterEncoding,
SortedMap<Object, Object> packageParams) {
StringBuffer sb = new StringBuffer();
Set es = packageParams.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
if (!"sign".equals(k) && null != v && !"".equals(v)) {
sb.append(k + "=" + v + "&");
}
}

sb.append("key=" + ConfigUtil.API_KEY);

// 算出摘要
String mysign = MD5Util.MD5Encode(sb.toString(), characterEncoding)
.toLowerCase();
String tenpaySign = ((String) packageParams.get("sign")).toLowerCase();

// System.out.println(tenpaySign + " " + mysign);
return tenpaySign.equals(mysign);
}

/**
* @Description：sign签名
* @param characterEncoding
* 编码格式
* @param parameters
* 请求参数
* @return
*/
public static String createSign(String characterEncoding,
SortedMap<Object, Object> parameters) {
// 签名字符串
StringBuffer sb = new StringBuffer();
// 遍历map集合
Set es = parameters.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
Object v = entry.getValue();
if (null != v && !"".equals(v) && !"sign".equals(k)
&& !"key".equals(k)) {
sb.append(k + "=" + v + "&");
}
}
sb.append("key=" + ConfigUtil.API_KEY);
System.out.println(sb + "=================sign签名字符串");
String sign = MD5Util.MD5Encode(sb.toString(), characterEncoding)
.toUpperCase();
return sign;
}

/**
* @Description：将请求参数转换为xml格式的string
* @param parameters
* 请求参数
* @return
*/
public static String getRequestXml(SortedMap<Object, Object> parameters) {
StringBuffer sb = new StringBuffer();
sb.append("<xml>");
Set es = parameters.entrySet();
Iterator it = es.iterator();
while (it.hasNext()) {
Map.Entry entry = (Map.Entry) it.next();
String k = (String) entry.getKey();
String v = (String) entry.getValue();
if ("attach".equalsIgnoreCase(k) || "body".equalsIgnoreCase(k)) {
sb.append("<" + k + ">" + "<![CDATA[" + v + "]]></" + k + ">");
} else {
sb.append("<" + k + ">" + v + "</" + k + ">");
}
}
sb.append("</xml>");
return sb.toString();
}

/**
* @Description：返回给微信的参数
* @param return_code
* 返回编码
* @param return_msg
* 返回信息
* @return
*/
public static String setXML(String return_code, String return_msg) {
return "<xml><return_code><![CDATA[" + return_code
+ "]]></return_code><return_msg><![CDATA[" + return_msg
+ "]]></return_msg></xml>";
}

/**
* 发送https请求
*
* @param requestUrl
* 请求地址
* @param requestMethod
* 请求方式（GET、POST）
* @param outputStr
* 提交的数据
* @return 返回微信服务器响应的信息
*/
public static String httpsRequest(String requestUrl, String requestMethod,
String outputStr) {
try {
// 创建SSLContext对象，并使用我们指定的信任管理器初始化
TrustManager[] tm = { new MyX509TrustManager() };
SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
sslContext.init(null, tm, new java.security.SecureRandom());
// 从上述SSLContext对象中得到SSLSocketFactory对象
SSLSocketFactory ssf = sslContext.getSocketFactory();
URL url = new URL(requestUrl);
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
// conn.setSSLSocketFactory(ssf);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
// 设置请求方式（GET/POST）
conn.setRequestMethod(requestMethod);
conn.setRequestProperty("content-type",
"application/x-www-form-urlencoded");
// 当outputStr不为null时向输出流写数据
if (null != outputStr) {
OutputStream outputStream = conn.getOutputStream();
// 注意编码格式
outputStream.write(outputStr.getBytes("UTF-8"));
outputStream.close();
}
// 从输入流读取返回内容
InputStream inputStream = conn.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(
inputStream, "UTF-8");
BufferedReader bufferedReader = new BufferedReader(
inputStreamReader);
String str = null;
StringBuffer buffer = new StringBuffer();
while ((str = bufferedReader.readLine()) != null) {
buffer.append(str);
}
// 释放资源
bufferedReader.close();
inputStreamReader.close();
inputStream.close();
inputStream = null;
conn.disconnect();
return buffer.toString();
} catch (ConnectException ce) {
// log.error("连接超时：{}", ce);
} catch (Exception e) {
// log.error("https请求异常：{}", e);
}
return null;
}

/**
* 发送https请求
*
* @param requestUrl
* 请求地址
* @param requestMethod
* 请求方式（GET、POST）
* @param outputStr
* 提交的数据
* @return JSONObject(通过JSONObject.get(key)的方式获取json对象的属性值)
*/
public static JSONObject httpsRequest(String requestUrl,
String requestMethod) {
JSONObject jsonObject = null;
try {
// 创建SSLContext对象，并使用我们指定的信任管理器初始化
TrustManager[] tm = { new MyX509TrustManager() };
SSLContext sslContext = SSLContext.getInstance("SSL", "SunJSSE");
sslContext.init(null, tm, new java.security.SecureRandom());
// 从上述SSLContext对象中得到SSLSocketFactory对象
SSLSocketFactory ssf = sslContext.getSocketFactory();
URL url = new URL(requestUrl);
HttpsURLConnection conn = (HttpsURLConnection) url.openConnection();
// conn.setSSLSocketFactory(ssf);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setUseCaches(false);
conn.setConnectTimeout(3000);
// 设置请求方式（GET/POST）
conn.setRequestMethod(requestMethod);
// conn.setRequestProperty("content-type",
// "application/x-www-form-urlencoded");
// 当outputStr不为null时向输出流写数据
// 从输入流读取返回内容
InputStream inputStream = conn.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(
inputStream, "UTF-8");
BufferedReader bufferedReader = new BufferedReader(
inputStreamReader);
String str = null;
StringBuffer buffer = new StringBuffer();
while ((str = bufferedReader.readLine()) != null) {
buffer.append(str);
}
// 释放资源
bufferedReader.close();
inputStreamReader.close();
inputStream.close();
inputStream = null;
conn.disconnect();

jsonObject = JSONObject.parseObject(buffer.toString());
} catch (ConnectException ce) {
// log.error("连接超时：{}", ce);
} catch (Exception e) {
System.out.println(e);
// log.error("https请求异常：{}", e);
}
return jsonObject;
}

public static String urlEncodeUTF8(String source) {
String result = source;
try {
result = java.net.URLEncoder.encode(source, "utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
return result;
}

/**
* 获取ip地址
*
* @param request
* @return
*/
public static String getIpAddr(HttpServletRequest request) {
InetAddress addr = null;
try {
addr = InetAddress.getLocalHost();
} catch (UnknownHostException e) {
return request.getRemoteAddr();
}
byte[] ipAddr = addr.getAddress();
String ipAddrStr = "";
for (int i = 0; i < ipAddr.length; i++) {
if (i > 0) {
ipAddrStr += ".";
}
ipAddrStr += ipAddr[i] & 0xFF;
}
return ipAddrStr;
}
}

===============================================================================================================

最后是java请求接口

/**
* 微信支付接口
*
* @param req
* @param resp
* @return 返回字符串给app由app调用微信支付功能
*/
@ResponseBody
@RequestMapping(value = "/wxPrePay", produces = "text/html;charset=UTF-8", method = { RequestMethod.GET })
public String wxPrePay(HttpServletRequest request,
HttpServletResponse response) {
String str = null;

// 金额单位转换成元
int price100 = new BigDecimal(0.01).multiply(new BigDecimal(100))
.intValue();
if (price100 <= 0) {

return "付款金额错误";
}
// 设置回调地址-获取当前的地址拼接回调地址
String url = request.getRequestURL().toString();
String domain = url.substring(0, url.length() - 13);
// 生产环境
String notify_url = domain + "wxNotify.html";
// 测试环境
// String notify_url =
// "http://1f504p5895.51mypc.cn/cia/app/wxNotify.html";

SortedMap<Object, Object> parameters = new TreeMap<Object, Object>();
parameters.put("appid", ConfigUtil.APPID);// appid
parameters.put("mch_id", ConfigUtil.MCH_ID);// 商户id
parameters.put("nonce_str", PayCommonUtil.CreateNoncestr());// 随机字符串
parameters.put("body", "购买测试");// 商品描述
parameters.put("out_trade_no", PayCommonUtil.CreateNoncestr(6)); // 订单唯一id
parameters.put("fee_type", "CNY");// 支付方式
parameters.put("total_fee", String.valueOf(price100));// 总金额
parameters.put("spbill_create_ip", PayCommonUtil.getIpAddr(request));// 获取ip地址
parameters.put("notify_url", notify_url);// 回调地址
parameters.put("trade_type", "APP");// 交易类型
// 设置签名
String sign = PayCommonUtil.createSign("UTF-8", parameters);
parameters.put("sign", sign);
// 封装请求参数成xml字符串
String requestXML = PayCommonUtil.getRequestXml(parameters);
// 调用统一下单接口返回prepay_id
String result = PayCommonUtil.httpsRequest(
ConfigUtil.UNIFIED_ORDER_URL, "POST", requestXML);
System.out.println("\n" + result);
try {
/**
* 统一下单接口返回正常的prepay_id，再按签名规范重新生成签名后，将数据传输给APP。参与签名的字段名为appId，
* partnerId
* ，prepayId，nonceStr，timeStamp，package。注意：package的值格式为Sign=WXPay
**/
Map<String, String> map = XMLUtil.doXMLParse(result);

SortedMap<Object, Object> parameterMap2 = new TreeMap<Object, Object>();
parameterMap2.put("appid", ConfigUtil.APPID);
parameterMap2.put("partnerid", ConfigUtil.MCH_ID);
parameterMap2.put("prepayid", map.get("prepay_id"));
parameterMap2.put("package", "Sign=WXPay");
parameterMap2.put("noncestr", PayCommonUtil.CreateNoncestr());
// 本来生成的时间戳是13位，但是ios必须是10位，所以截取了一下
parameterMap2.put(
"timestamp",
Long.parseLong(String.valueOf(System.currentTimeMillis())
.toString().substring(0, 10)));
String sign2 = PayCommonUtil.createSign("UTF-8", parameterMap2);
parameterMap2.put("sign", sign2);

str = JSON.toJSONString(parameterMap2);

} catch (JDOMException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return str;
}