java获取微信jsapi_ticket方法

                                java获取微信jsapi_ticket

首先要在公共账号中绑定域名,进入公共账号--设置

设置js安全域名

设置好以后就可以开始开发

可以参照https://mp.weixin.qq.com/wiki/7/aaa137b55fb2e0456bf8dd9148dd613f.html#.E9.99.84.E5.BD.951-JS-SDK.E4.BD.BF.E7.94.A8.E6.9D.83.E9.99.90.E7.AD.BE.E5.90.8D.E7.AE.97.E6.B3.95

获取jsapi_ticket

jsapi_ticket是公众号用于调用微信JS接口的临时票据。正常情况下，jsapi_ticket的有效期为7200秒，通过access_token来获取。由于获取jsapi_ticket的api调用次数非常有限，频繁刷新jsapi_ticket会导致api调用受限，影响自身业务，开发者必须在自己的服务全局缓存jsapi_ticket 

在数据库中加入一张表专门用来存放/刷新jsapi_ticket用的,里面有失效时间 每次更新时间和失效时间相差10分钟(有效时间1小时50分钟) 保证在没有失效前就去刷新

每次先去查看有没有未失效的jsapi_ticket  如果有就直接取到后去生成签名  
如果没有则去请求access_token 用access_token在去请求jsapi_ticket

上代码

@Service
public class JssdkService {
private final	String appid = "公共账号id";
private final	String secret = "公共账号secret";
@Autowired
private JssdkDao jssdkDao;
//url为分享的url
public Jssdk getInfo(String url) {
Jssdk jssdk = jssdkDao.getInfo();
String jsapi_ticket="";
if(jssdk==null||StringUtils.isEmpty(jssdk.getJsapiTicket())){
jsapi_ticket=getJsapiTicket();
}else{
jsapi_ticket=jssdk.getJsapiTicket();
}
jssdk=getSign(url,jsapi_ticket);
return jssdk;
}

private String getJsapiTicket(){
String requestUrl = "https://api.weixin.qq.com/cgi-bin/token?";
String params = "grant_type=client_credential&appid=" + appid + "&secret=" + secret + "";
String result = HttpRequestUtils.httpGet(requestUrl+params);
String access_token = JSONObject.parseObject(result).getString("access_token");
requestUrl = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?";
params = "access_token=" + access_token + "&type=jsapi";
result = HttpRequestUtils.httpGet(requestUrl+params);
String jsapi_ticket = JSONObject.parseObject(result).getString("ticket");
int activeTime=Integer.parseInt(JSONObject.parseObject(result).getString("expires_in"));
Jssdk jssdk = new Jssdk();
jssdk.setActiveTime(activeTime-600);
jssdk.setJsapiTicket(jsapi_ticket);
jssdkDao.update(jssdk);
return jsapi_ticket;
}
private Jssdk getSign(String url,String jsapi_ticket) {
String noncestr =  getNonceStr();
String timestamp =  getTimeStam
4000
p();
String sign = "jsapi_ticket=" + jsapi_ticket + "&noncestr=" + noncestr + "×tamp=" + timestamp + "&url=" + url;
sign = Sha1Util.getSha1(sign);
Jssdk jssdk = new Jssdk();
jssdk.setAppid(appid);
jssdk.setNoncestr(noncestr);
jssdk.setTimestamp(timestamp);
jssdk.setSign(sign);
return jssdk;
}
private String getNonceStr() {
Random random = new Random();
        return MD5Util.getMessageDigest(String.valueOf(random.nextInt(10000)).getBytes());
}

private String getTimeStamp() {
return String.valueOf(System.currentTimeMillis() / 1000);

}

import java.io.IOException;
import java.net.URLDecoder;

import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class HttpRequestUtils {
private static Logger logger = LoggerFactory.getLogger(HttpRequestUtils.class);    //日志记录

/**
* post请求
* @param url         url地址
* @return
*/
public static String httpPost(String url){
//post请求返回结果
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost method = new HttpPost(url);
String str = "";
try {
HttpResponse result = httpClient.execute(method);
url = URLDecoder.decode(url, "UTF-8");
/**请求发送成功，并得到响应**/
if (result.getStatusLine().getStatusCode() == 200) {
try {
/**读取服务器返回过来的json字符串数据**/
str = EntityUtils.toString(result.getEntity());
} catch (Exception e) {
logger.error("post请求提交失败:" + url, e);
}
}
} catch (IOException e) {
logger.error("post请求提交失败:" + url, e);
}
return str;
}

/**
* 发送get请求
* @param url    路径
* @return
*/
public static String httpGet(String url){
//get请求返回结果
String strResult = null;
try {
DefaultHttpClient client = new DefaultHttpClient();
//发送get请求
HttpGet request = new HttpGet(url);
HttpResponse response = client.execute(request);

/**请求发送成功，并得到响应**/
if (response.getStatusLine().getStatusCode() == org.apache.http.HttpStatus.SC_OK) {
/**读取服务器返回过来的json字符串数据**/
strResult = EntityUtils.toString(response.getEntity());
} else {
logger.error("get请求提交失败:" + url);
}
} catch (IOException e) {
logger.error("get请求提交失败:" + url, e);
}
return strResult;
}
}

json解析可以用alibaba.fastjson也可以用别的工具