一、依赖

maven仓库地址

https://mvnrepository.com/artifact/com.github.binarywang/weixin-java-miniapp

  <dependency>
            <groupId>com.github.binarywang</groupId>
            <artifactId>weixin-java-miniapp</artifactId>
            <version>4.3.0</version>
        </dependency>

二、配置

application.yml 

wx:
  miniapp:
    configs:
        - appid: #微信小程序的appid
          secret: #微信小程序的Secret
          token: #微信小程序消息服务器配置的token
          aesKey: #微信小程序消息服务器配置的EncodingAESKey
          msgDataFormat: JSON

package com.github.binarywang.demo.wx.miniapp.config;

import cn.binarywang.wx.miniapp.api.WxMaService;
import cn.binarywang.wx.miniapp.api.impl.WxMaServiceImpl;
import cn.binarywang.wx.miniapp.bean.WxMaKefuMessage;
import cn.binarywang.wx.miniapp.bean.WxMaSubscribeMessage;
import cn.binarywang.wx.miniapp.config.impl.WxMaDefaultConfigImpl;
import cn.binarywang.wx.miniapp.config.impl.WxMaRedisConfigImpl;
import cn.binarywang.wx.miniapp.message.WxMaMessageHandler;
import cn.binarywang.wx.miniapp.message.WxMaMessageRouter;
import com.google.common.collect.Lists;
import lombok.extern.slf4j.Slf4j;
import me.chanjar.weixin.common.bean.result.WxMediaUploadResult;
import me.chanjar.weixin.common.error.WxErrorException;
import me.chanjar.weixin.common.error.WxRuntimeException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import redis.clients.jedis.JedisPool;

import java.io.File;
import java.util.List;
import java.util.stream.Collectors;

/**
 * @author <a href="https://github.com/binarywang">Binary Wang</a>
 */
@Slf4j
@Configuration
@EnableConfigurationProperties(WxMaProperties.class)
public class WxMaConfiguration {
    private final WxMaProperties properties;

    @Autowired
    public WxMaConfiguration(WxMaProperties properties) {
        this.properties = properties;
    }

    @Bean
    public WxMaService wxMaService() {
        List<WxMaProperties.Config> configs = this.properties.getConfigs();
        if (configs == null) {
            throw new WxRuntimeException("大哥，拜托先看下项目首页的说明（readme文件），添加下相关配置，注意别配错了！");
        }
        WxMaService maService = new WxMaServiceImpl();
        maService.setMultiConfigs(
            configs.stream()
                .map(a -> {
                    WxMaDefaultConfigImpl config = new WxMaDefaultConfigImpl();
//                WxMaDefaultConfigImpl config = new WxMaRedisConfigImpl(new JedisPool());
                    // 使用上面的配置时，需要同时引入jedis-lock的依赖，否则会报类无法找到的异常
                    config.setAppid(a.getAppid());
                    config.setSecret(a.getSecret());
                    config.setToken(a.getToken());
                    config.setAesKey(a.getAesKey());
                    config.setMsgDataFormat(a.getMsgDataFormat());
                    return config;
                }).collect(Collectors.toMap(WxMaDefaultConfigImpl::getAppid, a -> a, (o, n) -> o)));
        return maService;
    }

    @Bean
    public WxMaMessageRouter wxMaMessageRouter(WxMaService wxMaService) {
        final WxMaMessageRouter router = new WxMaMessageRouter(wxMaService);
        router
            .rule().handler(logHandler).next()
            .rule().async(false).content("订阅消息").handler(subscribeMsgHandler).end()
            .rule().async(false).content("文本").handler(textHandler).end()
            .rule().async(false).content("图片").handler(picHandler).end()
            .rule().async(false).content("二维码").handler(qrcodeHandler).end();
        return router;
    }

    private final WxMaMessageHandler subscribeMsgHandler = (wxMessage, context, service, sessionManager) -> {
        service.getMsgService().sendSubscribeMsg(WxMaSubscribeMessage.builder()
            .templateId("此处更换为自己的模板id")
            .data(Lists.newArrayList(
                new WxMaSubscribeMessage.MsgData("keyword1", "339208499")))
            .toUser(wxMessage.getFromUser())
            .build());
        return null;
    };

    private final WxMaMessageHandler logHandler = (wxMessage, context, service, sessionManager) -> {
        log.info("收到消息：" + wxMessage.toString());
        service.getMsgService().sendKefuMsg(WxMaKefuMessage.newTextBuilder().content("收到信息为：" + wxMessage.toJson())
            .toUser(wxMessage.getFromUser()).build());
        return null;
    };

    private final WxMaMessageHandler textHandler = (wxMessage, context, service, sessionManager) -> {
        service.getMsgService().sendKefuMsg(WxMaKefuMessage.newTextBuilder().content("回复文本消息")
            .toUser(wxMessage.getFromUser()).build());
        return null;
    };

    private final WxMaMessageHandler picHandler = (wxMessage, context, service, sessionManager) -> {
        try {
            WxMediaUploadResult uploadResult = service.getMediaService()
                .uploadMedia("image", "png",
                    ClassLoader.getSystemResourceAsStream("tmp.png"));
            service.getMsgService().sendKefuMsg(
                WxMaKefuMessage
                    .newImageBuilder()
                    .mediaId(uploadResult.getMediaId())
                    .toUser(wxMessage.getFromUser())
                    .build());
        } catch (WxErrorException e) {
            e.printStackTrace();
        }

        return null;
    };

    private final WxMaMessageHandler qrcodeHandler = (wxMessage, context, service, sessionManager) -> {
        try {
            final File file = service.getQrcodeService().createQrcode("123", 430);
            WxMediaUploadResult uploadResult = service.getMediaService().uploadMedia("image", file);
            service.getMsgService().sendKefuMsg(
                WxMaKefuMessage
                    .newImageBuilder()
                    .mediaId(uploadResult.getMediaId())
                    .toUser(wxMessage.getFromUser())
                    .build());
        } catch (WxErrorException e) {
            e.printStackTrace();
        }

        return null;
    };

}

package com.github.binarywang.demo.wx.miniapp.config;

import java.util.List;

import org.springframework.boot.context.properties.ConfigurationProperties;

import lombok.Data;

/**
 * @author <a href="https://github.com/binarywang">Binary Wang</a>
 */
@Data
@ConfigurationProperties(prefix = "wx.miniapp")
public class WxMaProperties {

    private List<Config> configs;

    @Data
    public static class Config {
        /**
         * 设置微信小程序的appid
         */
        private String appid;

        /**
         * 设置微信小程序的Secret
         */
        private String secret;

        /**
         * 设置微信小程序消息服务器配置的token
         */
        private String token;

        /**
         * 设置微信小程序消息服务器配置的EncodingAESKey
         */
        private String aesKey;

        /**
         * 消息格式，XML或者JSON
         */
        private String msgDataFormat;
    }

}

 三、使用

package com.github.binarywang.demo.wx.miniapp.controller;

import cn.binarywang.wx.miniapp.api.WxMaService;
import cn.binarywang.wx.miniapp.constant.WxMaConstants;
import cn.binarywang.wx.miniapp.util.WxMaConfigHolder;
import com.google.common.collect.Lists;
import com.google.common.io.Files;
import lombok.AllArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import me.chanjar.weixin.common.bean.result.WxMediaUploadResult;
import me.chanjar.weixin.common.error.WxErrorException;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;

/**
 * <pre>
 *  小程序临时素材接口
 *  Created by BinaryWang on 2017/6/16.
 * </pre>
 *
 * @author <a href="https://github.com/binarywang">Binary Wang</a>
 */
@RestController
@AllArgsConstructor
@Slf4j
@RequestMapping("/wx/media/{appid}")
public class WxMaMediaController {
    private final WxMaService wxMaService;

    /**
     * 上传临时素材
     *
     * @return 素材的media_id列表，实际上如果有的话，只会有一个
     */
    @PostMapping("/upload")
    public List<String> uploadMedia(@PathVariable String appid, HttpServletRequest request) throws WxErrorException {
        if (!wxMaService.switchover(appid)) {
            throw new IllegalArgumentException(String.format("未找到对应appid=[%s]的配置，请核实！", appid));
        }

        CommonsMultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext());

        if (!resolver.isMultipart(request)) {
            WxMaConfigHolder.remove();//清理ThreadLocal
            return Lists.newArrayList();
        }

        MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
        Iterator<String> it = multiRequest.getFileNames();
        List<String> result = Lists.newArrayList();
        while (it.hasNext()) {
            try {
                MultipartFile file = multiRequest.getFile(it.next());
                File newFile = new File(Files.createTempDir(), file.getOriginalFilename());
                log.info("filePath is ：" + newFile.toString());
                file.transferTo(newFile);
                WxMediaUploadResult uploadResult = wxMaService.getMediaService().uploadMedia(WxMaConstants.KefuMsgType.IMAGE, newFile);
                log.info("media_id ： " + uploadResult.getMediaId());
                result.add(uploadResult.getMediaId());
            } catch (IOException e) {
                log.error(e.getMessage(), e);
            }
        }
        WxMaConfigHolder.remove();//清理ThreadLocal
        return result;
    }

    /**
     * 下载临时素材
     */
    @GetMapping("/download/{mediaId}")
    public File getMedia(@PathVariable String appid, @PathVariable String mediaId) throws WxErrorException {
        if (!wxMaService.switchover(appid)) {
            throw new IllegalArgumentException(String.format("未找到对应appid=[%s]的配置，请核实！", appid));
        }
        File media = wxMaService.getMediaService().getMedia(mediaId);
        WxMaConfigHolder.remove();//清理ThreadLocal
        return media;
    }
}

 注意事项：配置小程序appid等正确，WxMaConfiguration可以被启动了扫描；