java服务端接入腾讯即时通讯IM

腾讯IM文档地址：https://cloud.tencent.com/document/product/269/32688
首先要明白的是腾讯IM的聊天接发都是前端完成的，后台只需添加聊天账号与返回UserSig。

首先导包：

    
    
    
        com.github.tencentyun
        tls-sig-api-v2
        2.0
    
    
    
        org.apache.httpcomponents
        httpclient
    
    
    
        com.fasterxml.jackson.core
        jackson-databind
        2.11.4
    
    
    
        org.springframework.boot
        spring-boot-starter-data-redis
    
    
        org.apache.commons
        commons-lang3
    
    

创建一个http请求工具 HttpUtil.java

package com.example.demo.im.util;

import com.alibaba.fastjson.JSONObject;
import org.apache.http.Consts;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

/**
 * @author xiaochi
 * @date 2022/5/8 18:28
 * @desc HttpUtil
 */
public class HttpUtil {
    private static final CloseableHttpClient httpclient = HttpClients.createDefault();

    /**
     * 发送HttpGet请求
     * @param url
     * @return
     */
    public static String sendGet(String url) {
        HttpGet httpget = new HttpGet(url);
        CloseableHttpResponse response = null;
        try {
            response = httpclient.execute(httpget);
        } catch (IOException e1) {
            e1.printStackTrace();
        }
        String result = null;
        try {
            HttpEntity entity = response.getEntity();
            if (entity != null) {
                result = EntityUtils.toString(entity);
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            try {
                response.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return result;
    }

    /**
     * 发送HttpPost请求，参数为map
     * @param url
     * @param map
     * @return
     */
    public static String sendPost(String url, Map map) {
        List formparams = new ArrayList();
        for (Map.Entry entry : map.entrySet()) {
            formparams.add(new BasicNameValuePair(entry.getKey(), entry.getValue()));
        }
        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formparams, Consts.UTF_8);
        HttpPost httppost = new HttpPost(url);
        httppost.setEntity(entity);
        CloseableHttpResponse response = null;
        try {
            response = httpclient.execute(httppost);
        } catch (IOException e) {
            e.printStackTrace();
        }
        HttpEntity entity1 = response.getEntity();
        String result = null;
        try {
            result = EntityUtils.toString(entity1);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 发送不带参数的HttpPost请求
     * @param url
     * @return
     */
    public static String sendPost(String url) {
        HttpPost httppost = new HttpPost(url);
        CloseableHttpResponse response = null;
        try {
            response = httpclient.execute(httppost);
        } catch (IOException e) {
            e.printStackTrace();
        }
        HttpEntity entity = response.getEntity();
        String result = null;
        try {
            result = EntityUtils.toString(entity);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    public static String doPost2(String url, JSONObject param) {
        HttpPost httpPost = null;
        String result = null;
        try {
            HttpClient client = new DefaultHttpClient();
            httpPost = new HttpPost(url);
            if (param != null) {
                StringEntity se = new StringEntity(param.toString(), "utf-8");
                httpPost.setEntity(se); // post方法中，加入json数据
                httpPost.setHeader("Content-Type", "application/json");
                httpPost.setHeader("Authorization", param.getString("authorization"));
            }
            HttpResponse response = client.execute(httpPost);
            if (response != null) {
                HttpEntity resEntity = response.getEntity();
                if (resEntity != null) {
                    result = EntityUtils.toString(resEntity, "utf-8");
                }
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
        return result;
    }
}

接着创建 redis 工具 RedisUtil

package com.example.demo.im.util;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.HashOperations;
import org.springframework.data.redis.core.ListOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.SetOperations;
import org.springframework.data.redis.core.ValueOperations;
import org.springframework.data.redis.core.ZSetOperations;
import org.springframework.data.redis.support.atomic.RedisAtomicLong;
import org.springframework.stereotype.Component;

import java.io.Serializable;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.TimeUnit;

/**
 * @author xiaochi
 * @date 2022/5/8 18:58
 * @desc RedisServiceUtil
 */
@Component
public class RedisUtil {
    @Autowired
    private RedisTemplate redisTemplate;
    /**
     * 写入缓存
     * @param key
     * @param value
     * @return
     */
    public boolean set(final String key, Object value) {
        boolean result = false;
        try {
            ValueOperations operations = redisTemplate.opsForValue();
            operations.set(key, value);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
    /**
     * 写入缓存设置时效时间
     * @param key
     * @param value
     * @return
     */
    public boolean set(final String key, Object value, Long expireTime) {
        boolean result = false;
        try {
            ValueOperations operations = redisTemplate.opsForValue();
            operations.set(key, value);
            redisTemplate.expire(key, expireTime, TimeUnit.SECONDS);
            result = true;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 设置指定键的过期时间
     * @param key 键
     * @param expireTime 过期时间
     * @param timeUnit 时间单位
     * @return true：成功
     */
    public boolean setExpire(final String key, Long expireTime, TimeUnit timeUnit) {
        return redisTemplate.expire(key, expireTime, timeUnit);
    }

    /**
     * 批量删除对应的value
     * @param keys
     */
    public void remove(final String... keys) {
        for (String key : keys) {
            remove(key);
        }
    }

    /**
     * 删除对应的value
     * @param key
     */
    public void remove(final String key) {
        if (exists(key)) {
            redisTemplate.delete(key);
        }
    }
    /**
     * 判断缓存中是否有对应的value
     * @param key
     * @return
     */
    public boolean exists(final String key) {
        return redisTemplate.hasKey(key);
    }
    /**
     * 读取缓存
     * @param key
     * @return
     */
    public  T get(final String key) {
        Object result = null;
        ValueOperations operations = redisTemplate.opsForValue();
        result = operations.get(key);
        if (null == result) {
            return null;
        }
        return (T)result;
    }
    /**
     * 哈希 添加
     * @param key
     * @param hashKey
     * @param value
     */
    public void hmSet(String key, Object hashKey, Object value) {
        HashOperations hash = redisTemplate.opsForHash();
        hash.put(key,hashKey,value);
    }

    /**
     * 以map集合的形式添加键值对
     * @param key 键
     * @param map Map
     */
    public void hPutAll(String key, Map map) {
        redisTemplate.opsForHash().putAll(key, map);
    }

    /**
     * 哈希获取数据
     * @param key
     * @param hashKey
     * @return
     */
    public Object hmGet(String key, Object hashKey) {
        HashOperations hash = redisTemplate.opsForHash();
        return hash.get(key,hashKey);
    }

    /**
     * 根据键获取到redis中存储的map
     * @param key 键
     * @return 键对应的map
     */
    public Map hGetAll(String key) {
        return redisTemplate.opsForHash().entries(key);
    }

    /**
     * 自增/自减key对应map中的指定字段的long型数值
     * @param key 键
     * @param field key对应map中存储的字段
     * @param increment 正数-自增；负数-自减
     * @return 自增/自减后的数值
     */
    public Long hashIncrBy(String key, Object field, long increment) {
        return redisTemplate.opsForHash().increment(key, field, increment);
    }

    /**
     * 自增/自减key对应map中的指定字段的double型数值
     * @param key 键
     * @param field key对应map中存储的字段
     * @param delta 正数-自增；负数-自减
     * @return 自增/自减后的数值
     */
    public Double hIncrByDouble(String key, Object field, double delta) {
        return redisTemplate.opsForHash().increment(key, field, delta);
    }

    /**
     * 查询redis中指定字段是否存在
     * @param key 键
     * @param field key对应map中存储的字段
     * @return true:存在
     */
    public boolean hashExists(String key, String field) {
        return redisTemplate.opsForHash().hasKey(key, field);
    }

    /**
     * 列表添加
     * @param k
     * @param v
     */
    public void lPush(String k, Object v) {
        ListOperations list = redisTemplate.opsForList();
        list.rightPush(k,v);
    }

    /**
     * 列表获取
     * @param k
     * @param l
     * @param l1
     * @return
     */
    public List