微信相关操作

通过转发形式分享图片/图片内容链接到朋友

1.判断超过2个小时重新加载

/**
 * 初始化获取有效的jsapi_ticket，方便后续生成签名
 * 1.定义全局jsapi_ticket用于保存临时票据
 * 2.定义全局lastCallTime用于存放最后一次调用的时间
 * 3.首先判断jsapi_ticket为空或者当前时间 - 全局lastCallTime >= 2个小时则重新获取临时票据
 */
if ("".equals(weixinTicket) || ((new Date().getTime() - lastCallTime) >= 7200 * 1000)) {
    try {

	weixinTicket=weiXinRedPackLinkService.callWeixinAccessToken();
	lastCallTime=new Date().getTime();

    } catch (BusinessException e) {
	logger.error("RomotionRuleController.enterRedPack", e);
    } catch (Exception e) {
	logger.error(e.getMessage(), e);
    }
}

2.调用微信JS接口的临时票据jsapi_ticket的有效期为7200秒（2小时）

// 定义微信wx.config函数用到时间戳
String timestamp = new Date().getTime() + "";
// 定义微信生成签名的随机串
String noncestr = UUID.randomUUID().toString();
String signature = "";
try {
    /**
     * 通过临时票据获取签名
     * 这里的newUrl指的路径为需要转发的链接请求地址
     */
    signature = weiXinRedPackLinkService.signAppend(noncestr, newUrl + "&from=singlemessage&isappinstalled=0", timestamp, weixinTicket);
} catch (BusinessException e) {
    logger.error("RomotionRuleController.enterRedPack", e);
}

3.以下为获取微信签名提供方法

/**
* 获取微信临时签证
* @return
* @throws BusinessException
*/
public String callWeixinAccessToken() throws BusinessException {

	// 获取微信返回的token
	String accessToken = callWeixinAccessTokencallWeixinAccessToken();
	String ticket = "";
	if (StringUtils.isNotEmpty(accessToken)) {
	    // 获取微信返回的临时票据
	    ticket = callWeixinTicket(accessToken);
	}
	return ticket;
}

/**
* 将获取到的微信返回的签名进行有顺序的拼接
* @param noncestr
* @param signUrl
* @param timestamp
* @param ticket
* @throws BusinessException
*/
public String signAppend(String noncestr, String signUrl, String timestamp, String ticket) throws BusinessException {
	String signature = "";
	//注意这里参数名必须全部小写，且必须有序
	String string1 = "jsapi_ticket=" + ticket +
		"&noncestr=" + noncestr +
		"&timestamp=" + timestamp +
		"&url=" + signUrl;
	try {
	    logger.debug("WeiXinRedPackLinkService.signAppend =: " + string1);
	    MessageDigest crypt = MessageDigest.getInstance("SHA-1");
	    crypt.reset();
	    crypt.update(string1.getBytes("UTF-8"));
	    signature = byteToHex(crypt.digest());
	} catch (NoSuchAlgorithmException e) {
	    throw new BusinessException("WeiXinRedPackLinkService.signAppend he encryption algorithm is not available field", e);
	} catch (UnsupportedEncodingException e) {
	    throw new BusinessException("WeiXinRedPackLinkService.signAppend Does not support the character encoding field", e);
	}

	return signature;
}

/**
* 根据微信平台公众号appId和appSecret获取签名所需的token
* @return
*/
private String callWeixinAccessTokencallWeixinAccessToken() throws BusinessException {
	String weixinURl = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=wx7b0b95f2acea61e2&secret=30514dd42fea986e6a647cf9ccf96da8";

	try {
	    String temp = getHttpContent(weixinURl);
	    if (checkaAccessTocket(temp)) {
		String[] resultArray = StringUtils.split(temp, ",");
		temp = resultArray[0];
		temp = StringUtils.replace(temp, "{\"access_token\":\"", "");
		temp = StringUtils.replace(temp, "\"", "");
		return temp;
	    }
	} catch (Exception e) {
	    throw new BusinessException("WeiXinRedPackLinkService.callWeixinAccessTokencallWeixinAccessToken field", e);
	}

	return null;
}

/**
* 根据token获取微信返回的临时签证
* @param accessToken
* @return
*/
private String callWeixinTicket(String accessToken) throws BusinessException {
	String tokenUrl = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=" + accessToken + "&type=jsapi";
	try {
	    String temp = getHttpContent(tokenUrl);
	    WinxinTokenDto winxinTokenDto = new Gson().fromJson(temp, WinxinTokenDto.class);
	    if (winxinTokenDto != null) {
		return winxinTokenDto.getTicket();
	    }
	} catch (Exception e) {
	    throw new BusinessException("WeiXinRedPackLinkService.callWeixinTicket field", e);
	}
	return null;
}

/**
* 根据url通过HttpClient请求链接地址，返回数据
* @param weixinURl
* @returnd
* @throws Exception
*/
private String getHttpContent(String weixinURl) throws Exception {
	HttpClient client = new DefaultHttpClient();
	// 实例化HTTP方法
	HttpGet request = new HttpGet();

	request.setURI(new URI(weixinURl));
	HttpResponse response = client.execute(request);
	String result = EntityUtils.toString(response.getEntity());

	return result;
}

/**
* 校验返回的tocket是否符合条件
* @param result
* @return
*/
private boolean checkaAccessTocket(String result) {
	boolean flg = true;
	if (result.indexOf("{\"access_token\":\"") == -1) {
	    flg = false;
	}
	if (flg) {
	    if (result.indexOf(",") == -1) {
		flg = false;
	    }
	}

	return flg;
}

public String byteToHex(final byte[] hash) {
	Formatter formatter = new Formatter();
	for (byte b : hash)
	{
	    formatter.format("%02x", b);
	}
	String result = formatter.toString();
	formatter.close();
	return result;
}

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二。微信app分享

1.打开网页https://open.weixin.qq.com/ 注册微信开发平台账号

2.参照提示填写相关信息，其中应用包名为项目包的名字，等待客户审核

3.解压微信官方下载的appDemo文件wechat_sdk_sample_android

4.找到该目录下的debug.keystore

5.将debug.keystore复制到自己项目的根目录下，运行该app

6.解压文件Gen_Signature_Android221cbf.jar，并安装到手机，运行该签名工具，写上项目包名获取签名的MD5加密串.

6.将MD5加密串填写到微信开放平台，开发者信息中的应用签名

7.参照官方appDemo进行开发。

说明：debug.keystore添加的2中方式：

1.eclipse：Eclipse--->Windows--->Preferences--->Android--->Build 手动变更路径(Custom debug keystore)

2.在gradle中配置：

signingConfigs {

          debug {
              storeFile file('../debug.keystore') //如果只有一层目录则不需要../
              storePassword 'android'
              keyAlias 'androiddebugkey'
              keyPassword 'android'
          }
     }

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