步骤看官网文档，这里只有java后台代码

签名工具类

import java.security.MessageDigest;

import java.security.NoSuchAlgorithmException;

import java.util.*;

/**

* @author xmg

* @Description 签名工具类

* @Date:2019/5/7

*/

public class SignUtil {

/**

* 前端jssdk页面配置需要用到的配置参数

* @param url

* @return {appid,timestamp,nonceStr,signature}

* @throws Exception

*/

public static HashMap jsSDK_Sign(String url) throws Exception {

String nonce_str = create_nonce_str();

String timestamp= System.currentTimeMillis()/1000 + "";

String jsapi_ticket= WxService.getJsSdkTicket();

// 注意这里参数名必须全部小写，且必须有序

// 参数

Map packageParams = new HashMap<>();

packageParams.put("url", url);

packageParams.put("noncestr", nonce_str);

packageParams.put("jsapi_ticket", jsapi_ticket);

packageParams.put("timestamp", timestamp);

// 获得拼接好的参数,按照ASCLL大小排序

String createLinkString = createLinkString(packageParams);

String signature = SHA1(createLinkString);

// 参数封装,返回前台

HashMap jssdk=new HashMap();

jssdk.put("appId", WxService.APP_ID);

jssdk.put("timestamp", timestamp);

jssdk.put("nonceStr", nonce_str);

jssdk.put("signature", signature);

return jssdk;

}

public static String SHA1(String decript) {

try {

MessageDigest digest = java.security.MessageDigest.getInstance("SHA-1");

digest.update(decript.getBytes());

byte messageDigest[] = digest.digest();

// Create Hex String

StringBuffer hexString = new StringBuffer();

// 字节数组转换为 十六进制 数

for (int i = 0; i < messageDigest.length; i++) {

String shaHex = Integer.toHexString(messageDigest[i] & 0xFF);

if (shaHex.length() < 2) {

hexString.append(0);

}

hexString.append(shaHex);

}

return hexString.toString();

} catch (NoSuchAlgorithmException e) {

e.printStackTrace();

}

return "";

}

/**

* 把数组所有元素排序，并按照“参数=参数值”的模式用“&”字符拼接成字符串

* @param params 需要排序并参与字符拼接的参数组

* @return 拼接后字符串

*/

public static String createLinkString(Map params) {

List keys = new ArrayList(params.keySet());

Collections.sort(keys);

String prestr = "";

for (int i = 0; i < keys.size(); i++) {

String key = keys.get(i);

String value = params.get(key);

if (i == keys.size() - 1) {// 拼接时，不包括最后一个&字符

prestr = prestr + key + "=" + value;

} else {

prestr = prestr + key + "=" + value + "&";

}

}

return prestr;

}

private static String create_nonce_str() {

return UUID.randomUUID().toString();

}

}

/**

* @author xmg

* @Description Ticket封装

* @Date:2019/5/7 0:31

*/

public class Ticket {

/** ticket */

private String ticket;

/** 过期时间 */

private long expiresTime;

public String getTicket() {

return ticket;

}

public void setTicket(String ticket) {

this.ticket = ticket;

}

public long getExpiresTime() {

return expiresTime;

}

public void setExpiresTime(long expiresTime) {

this.expiresTime = expiresTime;

}

public Ticket(String ticket, String expiresIn) {

super();

this.ticket = ticket;

this.expiresTime = System.currentTimeMillis() + Integer.parseInt(expiresIn)*1000;

}

/**

* 判断token是否过期

* @return

*/

public boolean isExpired(){

return System.currentTimeMillis() > this.expiresTime;

}

}

import org.apache.commons.lang3.StringUtils;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.stereotype.Service;

import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

import java.io.InputStream;

import java.util.*;

/**

* @author xmg

* @Description

* @email 463364973@qq.com

*

* Date:2019/4/5 15:25

*/

@Service

public class WxService {

private final static Logger LOGGER = LoggerFactory.getLogger(WxService.class);

/** 获取ticket地址 */

private final static String GET_TICKET_URL = "https://api.weixin.qq.com/cgi-bin/ticket/getticket?access_token=ACCESS_TOKEN&type=jsapi";

/** appid */

public final static String APP_ID = "你自己appid";

/** appsecret */

public final static String APP_SECRET = "你自己的secret";

private static Ticket TICKET;

/**

* 获取ticket

*/

private static void getTicket(){

// RestTemplate

RestTemplate restTemplate = new RestTemplate();

String url = GET_TICKET_URL.replace("ACCESS_TOKEN",getAccessToken());

String forObject = restTemplate.getForObject(url, String.class);

JSONObject jsonObject = JSONUtil.parseObj(forObject);

String ticket = jsonObject.getStr("ticket");

String expiresIn = jsonObject.getStr("expires_in");

// 创建token对象,并存起来

TICKET = new Ticket(ticket,expiresIn);

}

/**

* 向外暴露的获取Ticket方法

* @return

*/

public static String getJsSdkTicket(){

if (TICKET == null || TICKET.isExpired()){

getTicket();

}

return TICKET.getTicket();

}

}