/* service代码略*/ List<PanelDto> panels = panelService.getAllPanels(); //得到接口的名称，接口的url
第二步，根据拿到的信息生成请求参数：
getPanelInfo.java
WrapResponseModel resonseModel = new WrapResponseModel(); Map<String, String> headers = new HashMap<>(); headers.put("username", username); headers.put("token",token); List<String> content = new ArrayList<String>(); for(PanelDto panelDto:panel){ //发送http请求 content.add(HttpRequestUtils.get(panelDto.getUrl(), headers)); } // 返回格式 responseModel.setCode(SUCCESS_CODE); responseModel.setData(content);第三步，发送http请求调用接口：
HttpRequestUtils.java
public static String get(String url, Map<String, String> headers) { RequestConfig config = RequestConfig.custom().setConnectTimeout(TIME_OUT).setConnectionRequestTimeout(TIME_OUT).setSocketTimeout(TIME_OUT).build(); String ret = null; //创建HttpClient对象 CloseableHttpClient closeHttpClient = HttpClients.createDefault(); CloseableHttpResponse httpResponse = null; //发送get请求 HttpGet httpGet = new HttpGet(url); try { // add header if (Objects.nonNull(headers)) { Set<String> keys = headers.keySet(); for (Iterator<String> i = keys.iterator(); i.hasNext(); ) { String key = i.next(); httpGet.addHeader(key, headers.get(key)); } } httpGet.setConfig(config); //执行Get请求 得到Response对象 httpResponse = closeHttpClient.execute(httpGet); //httpResponse.getStatusLine() 响应头信息 int httpResponseCode = httpResponse.getStatusLine().getStatusCode(); if (200 != httpResponseCode) { logger.error("http返回值异常， httpResponseCode = " + httpResponseCode); } //返回对象 HttpEntity httpEntity = httpResponse.getEntity(); ret = EntityUtils.toString(httpEntity, "UTF-8"); } catch (UnsupportedEncodingException e) { logger.error(e.getMessage(), e); } catch (ClientProtocolException e) { logger.error(e.getMessage(), e); } catch (IOException e) { //logger.error(e.getMessage(), e); } finally { if (httpResponse != null) { try { httpResponse.close(); } catch (IOException e) { logger.error(e.getMessage(), e); } } if (closeHttpClient != null) { try { closeHttpClient.close(); } catch (IOException e) { logger.error(e.getMessage(), e); } } } return ret; }第四步，查询数据set进redis，之后返回查询的数据:
if (!Objects.equals(redisCache, "false")) {
//redisttl过期时间 redisProxyHandler.set(redisKey, JSON.toJSONString(responseModel), REDIS_TTL); logger.error("set succeed!!!!!!!!!!!!!!!!"); }
redisHandler.java
public void set(String key, String value, int seconds) { redisCacheProvider.set(key, value, seconds); }
redisProvider.java
@Autowired private JedisPool jedisPool; public Jedis getJedis() { Jedis jedis = this.jedisPool.getResource(); // 使用index为2的database jedis.select(2); return jedis; } public void set(String key, String value, int seconds) { Jedis jedis = null; try { jedis = getJedis(); jedis.setex(key, seconds, value); Long exp = jedis.ttl(key); if (exp < 0) { throw new RuntimeException("data time out！");19 } } catch (Throwable e) { logger.error(e.getMessage(), e); throw new TokenException(e.getMessage()); } finally { if(jedis != null){jedis.close;} } }第五步，请求接口的时候，先请求redis缓存,如果命中则返回命中数据，否则，将执行上面的发送http请求在拼凑数据返回的代码：
getPanelInfo.java
String panelInfo = redisProxyHandler.get(redisKey); Long expire = redisProxyHandler.getExpire(redisKey); //命中才返回，否则会去发http请求 if (Objects.nonNull(panelInfo) && (expire > 0) && expire <REDIS_TTL) { responseModel = JSON.parseObject(panelInfo, WrapResponseModel.class); return responseModel; }redisHandler.java
public String get(String key) return redisCacheProvider.get(key); }
redisProvider.java
public String get(String key) { String value = null; Jedis jedis = null; try { jedis = getJedis(); value = jedis.get(key); } catch (Throwable e) { logger.error(e.getMessage(), e); throw new TokenException(e.getMessage()); } finally { if(jedis != null){ jedis.close(); } } return value; }applicationContext.xml
<!-- 读取配置文件信息 --> <context:property-placeholder location="classpath:redis.properties" file-encoding="UTF-8" ignore-unresolvable="true"/> <!-- Jedis 连接池配置 --> <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig"> <property name="maxTotal" value="${redis.pool.maxTotal}"/> <property name="maxIdle" value="${redis.pool.maxIdle}"/> <property name="maxWaitMillis" value="${redis.pool.maxWaitMillis}"/> <property name="testOnBorrow" value="${redis.pool.testOnBorrow}"/> </bean> <bean id="jedisPool" class="redis.clients.jedis.JedisPool"> <constructor-arg ref="jedisPoolConfig"/> <constructor-arg value="${jedis.host}" type="java.lang.String"/> <constructor-arg type="int" value="${jedis.port}"/> </bean>redis.properties
# 控制一个pool可分配多少个jedis实例
redis.pool.maxTotal=1000
# 控制一个pool最多有多少个状态为idle(空闲)的jedis实例
redis.pool.maxIdle=200
# 表示当borrow一个jedis实例时，最大的等待时间，如果超过等待时间，则直接抛出JedisConnectionException
redis.pool.maxWaitMillis=2000
#在borrow一个jedis实例时，是否提前进行validate操作；如果为true，则得到的jedis实例均是可用的
redis.pool.testOnBorrow=true
# redis 单机
# 单机 host
jedis.host=127.0.0.1
# 单机 port
jedis.port=6379
文章来源: Java项目中使用Redis缓存案例