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Java常用工具类(自用)

1|0统一响应格式


1|1Response类


@JsonInclude(JsonInclude.Include.NON_NULL) public class Response<T> implements Serializable { private Integer code; private String msg; private T data; public Response() { this.code = AppHttpCodeEnum.SUCCESS.getCode(); this.msg = AppHttpCodeEnum.SUCCESS.getMsg(); } public Response(Integer code, T data) { this.code = code; this.data = data; } public Response(Integer code, String msg, T data) { this.code = code; this.msg = msg; this.data = data; } public Response(Integer code, String msg) { this.code = code; this.msg = msg; } public static Response errorResult(int code, String msg) { Response result = new Response(); return result.error(code, msg); } public static Response okResult() { Response result = new Response(); return result; } public static Response okResult(int code, String msg) { Response result = new Response(); return result.ok(code, null, msg); } public static Response okResult(Object data) { Response result = setAppHttpCodeEnum(AppHttpCodeEnum.SUCCESS, AppHttpCodeEnum.SUCCESS.getMsg()); if (data != null) { result.setData(data); } return result; } public static Response errorResult(AppHttpCodeEnum enums) { return setAppHttpCodeEnum(enums, enums.getMsg()); } public static Response errorResult(AppHttpCodeEnum enums, String msg) { return setAppHttpCodeEnum(enums, msg); } public static Response setAppHttpCodeEnum(AppHttpCodeEnum enums) { return okResult(enums.getCode(), enums.getMsg()); } private static Response setAppHttpCodeEnum(AppHttpCodeEnum enums, String msg) { return okResult(enums.getCode(), msg); } public Response<?> error(Integer code, String msg) { this.code = code; this.msg = msg; return this; } public Response<?> ok(Integer code, T data) { this.code = code; this.data = data; return this; } public Response<?> ok(Integer code, T data, String msg) { this.code = code; this.data = data; this.msg = msg; return this; } public Response<?> ok(T data) { this.data = data; return this; } public Integer getCode() { return code; } public void setCode(Integer code) { this.code = code; } public String getMsg() { return msg; } public void setMsg(String msg) { this.msg = msg; } public T getData() { return data; } public void setData(T data) { this.data = data; } }

1|2AppHttpCodeEnum枚举


public enum AppHttpCodeEnum { SUCCESS(200, "操作成功"), NEED_LOGIN(401, "需要登录后操作"), NO_OPERATOR_AUTH(403, "无权限操作"), SYSTEM_ERROR(500, "出现错误"), USERNAME_EXIST(501, "用户名已存在"), PHONENUMBER_EXIST(502, "手机号已存在"), EMAIL_EXIST(503, "邮箱已存在"), REQUIRE_USERNAME(504, "必需填写用户名"), LOGIN_ERROR(505, "用户名或密码错误"); int code; String msg; AppHttpCodeEnum(int code, String errorMessage) { this.code = code; this.msg = errorMessage; } public int getCode() { return code; } public String getMsg() { return msg; } }

2|0Bean拷贝工具类


public class BeanCopyUtils { private BeanCopyUtils() { } public static <T> T copyBean(Object source, Class<T> tClass) { T result = null; try { result = tClass.newInstance(); BeanUtils.copyProperties(source, result); } catch (Exception e) { e.printStackTrace(); } return result; } public static <O, T> List<T> copyBeanList(List<O> list, Class<T> tClass) { return list.stream().map(o -> copyBean(o, tClass)).collect(Collectors.toList()); } }

3|0跨域配置&&fastjson配置


@Configuration public class WebConfig implements WebMvcConfigurer { @Override public void addCorsMappings(CorsRegistry registry) { // 设置允许跨域的路径 registry.addMapping("/**") // 设置允许跨域请求的域名 .allowedOriginPatterns("*") // 是否允许cookie .allowCredentials(true) // 设置允许的请求方式 .allowedMethods("GET", "POST", "DELETE", "PUT") // 设置允许的header属性 .allowedHeaders("*") // 跨域允许时间 .maxAge(3600); } @Bean public HttpMessageConverter fastJsonHttpMessageConverters() { FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter(); FastJsonConfig fastJsonConfig = new FastJsonConfig(); fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat); fastJsonConfig.setDateFormat("yyyy-MM-dd HH:mm:ss"); SerializeConfig.globalInstance.put(Long.class, ToStringSerializer.instance); fastJsonConfig.setSerializeConfig(SerializeConfig.globalInstance); fastConverter.setFastJsonConfig(fastJsonConfig); HttpMessageConverter<?> converter = fastConverter; return converter; } @Override public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { converters.add(fastJsonHttpMessageConverters()); } }

4|0redis


4|1redis配置类


@Configuration public class RedisConfig { @Bean RedisTemplate redisTemplate(RedisConnectionFactory redisConnectionFactory) { RedisTemplate redisTemplate = new RedisTemplate(); redisTemplate.setConnectionFactory(redisConnectionFactory); Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class); jackson2JsonRedisSerializer.setObjectMapper(new ObjectMapper()); redisTemplate.setKeySerializer(new StringRedisSerializer()); redisTemplate.setValueSerializer(jackson2JsonRedisSerializer); redisTemplate.setHashKeySerializer(new StringRedisSerializer()); redisTemplate.setHashValueSerializer(jackson2JsonRedisSerializer); return redisTemplate; } }

4|2redisUtil


@Component public class RedisUtil { @Autowired private RedisTemplate redisTemplate; /** * 指定缓存失效时间 * * @param key 键 * @param time 时间(秒) * @return */ public boolean expire(String key, long time) { try { if (time > 0) { redisTemplate.expire(key, time, TimeUnit.SECONDS); } return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 根据key 获取过期时间 * * @param key 键 不能为null * @return 时间(秒) 返回0代表为永久有效 */ public long getExpire(String key) { return redisTemplate.getExpire(key, TimeUnit.SECONDS); } /** * 判断key是否存在 * * @param key 键 * @return true 存在 false不存在 */ public boolean hasKey(String key) { try { return redisTemplate.hasKey(key); } catch (Exception e) { e.printStackTrace(); return false; } } /** * 删除缓存 * * @param key 可以传一个值 或多个 */ @SuppressWarnings("unchecked") public void del(String... key) { if (key != null && key.length > 0) { if (key.length == 1) { redisTemplate.delete(key[0]); } else { redisTemplate.delete(CollectionUtils.arrayToList(key)); } } } //============================String============================= /** * 普通缓存获取 * * @param key 键 * @return */ public Object get(String key) { return key == null ? null : redisTemplate.opsForValue().get(key); } /** * 普通缓存放入 * * @param key 键 * @param value 值 * @return true成功 false失败 */ public boolean set(String key, Object value) { try { redisTemplate.opsForValue().set(key, value); return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 普通缓存放入并设置时间 * * @param key 键 * @param value 值 * @param time 时间(秒) time要大于0 如果time小于等于0 将设置无限期 * @return true成功 false 失败 */ public boolean set(String key, Object value, long time) { try { if (time > 0) { redisTemplate.opsForValue().set(key, value, time, TimeUnit.SECONDS); } else { set(key, value); } return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 递增 * * @param key 键 * @param delta 要增加几(大于0) * @return */ public long incr(String key, long delta) { if (delta < 0) { throw new RuntimeException("递增因子必须大于0"); } return redisTemplate.opsForValue().increment(key, delta); } /** * 递减 * * @param key 键 * @param delta 要减少几(小于0) * @return */ public long decr(String key, long delta) { if (delta < 0) { throw new RuntimeException("递减因子必须大于0"); } return redisTemplate.opsForValue().increment(key, -delta); } //================================Map================================= /** * HashGet * * @param key 键 不能为null * @param item 项 不能为null * @return */ public Object hget(String key, String item) { return redisTemplate.opsForHash().get(key, item); } /** * 获取hashKey对应的所有键值 * * @param key 键 * @return 对应的多个键值 */ public Map<Object, Object> hmget(String key) { return redisTemplate.opsForHash().entries(key); } /** * HashSet * * @param key 键 * @param map 对应多个键值 * @return true 成功 false 失败 */ public boolean hmset(String key, Map<String, Object> map) { try { redisTemplate.opsForHash().putAll(key, map); return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * HashSet 并设置时间 * * @param key 键 * @param map 对应多个键值 * @param time 时间(秒) * @return true成功 false失败 */ public boolean hmset(String key, Map<String, Object> map, long time) { try { redisTemplate.opsForHash().putAll(key, map); if (time > 0) { expire(key, time); } return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 向一张hash表中放入数据,如果不存在将创建 * * @param key 键 * @param item 项 * @param value 值 * @return true 成功 false失败 */ public boolean hset(String key, String item, Object value) { try { redisTemplate.opsForHash().put(key, item, value); return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 向一张hash表中放入数据,如果不存在将创建 * * @param key 键 * @param item 项 * @param value 值 * @param time 时间(秒) 注意:如果已存在的hash表有时间,这里将会替换原有的时间 * @return true 成功 false失败 */ public boolean hset(String key, String item, Object value, long time) { try { redisTemplate.opsForHash().put(key, item, value); if (time > 0) { expire(key, time); } return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 删除hash表中的值 * * @param key 键 不能为null * @param item 项 可以使多个 不能为null */ public void hdel(String key, Object... item) { redisTemplate.opsForHash().delete(key, item); } /** * 判断hash表中是否有该项的值 * * @param key 键 不能为null * @param item 项 不能为null * @return true 存在 false不存在 */ public boolean hHasKey(String key, String item) { return redisTemplate.opsForHash().hasKey(key, item); } /** * hash递增 如果不存在,就会创建一个 并把新增后的值返回 * * @param key 键 * @param item 项 * @param by 要增加几(大于0) * @return */ public double hincr(String key, String item, double by) { return redisTemplate.opsForHash().increment(key, item, by); } /** * hash递减 * * @param key 键 * @param item 项 * @param by 要减少记(小于0) * @return */ public double hdecr(String key, String item, double by) { return redisTemplate.opsForHash().increment(key, item, -by); } //============================set============================= /** * 根据key获取Set中的所有值 * * @param key 键 * @return */ public Set<Object> sGet(String key) { try { return redisTemplate.opsForSet().members(key); } catch (Exception e) { e.printStackTrace(); return null; } } /** * 根据value从一个set中查询,是否存在 * * @param key 键 * @param value 值 * @return true 存在 false不存在 */ public boolean sHasKey(String key, Object value) { try { return redisTemplate.opsForSet().isMember(key, value); } catch (Exception e) { e.printStackTrace(); return false; } } /** * 将数据放入set缓存 * * @param key 键 * @param values 值 可以是多个 * @return 成功个数 */ public long sSet(String key, Object... values) { try { return redisTemplate.opsForSet().add(key, values); } catch (Exception e) { e.printStackTrace(); return 0; } } /** * 将set数据放入缓存 * * @param key 键 * @param time 时间(秒) * @param values 值 可以是多个 * @return 成功个数 */ public long sSetAndTime(String key, long time, Object... values) { try { Long count = redisTemplate.opsForSet().add(key, values); if (time > 0) expire(key, time); return count; } catch (Exception e) { e.printStackTrace(); return 0; } } /** * 获取set缓存的长度 * * @param key 键 * @return */ public long sGetSetSize(String key) { try { return redisTemplate.opsForSet().size(key); } catch (Exception e) { e.printStackTrace(); return 0; } } /** * 移除值为value的 * * @param key 键 * @param values 值 可以是多个 * @return 移除的个数 */ public long setRemove(String key, Object... values) { try { Long count = redisTemplate.opsForSet().remove(key, values); return count; } catch (Exception e) { e.printStackTrace(); return 0; } } //===============================list================================= /** * 获取list缓存的内容 * * @param key 键 * @param start 开始 * @param end 结束 0 到 -1代表所有值 * @return */ public List<Object> lGet(String key, long start, long end) { try { return redisTemplate.opsForList().range(key, start, end); } catch (Exception e) { e.printStackTrace(); return null; } } /** * 获取list缓存的长度 * * @param key 键 * @return */ public long lGetListSize(String key) { try { return redisTemplate.opsForList().size(key); } catch (Exception e) { e.printStackTrace(); return 0; } } /** * 通过索引 获取list中的值 * * @param key 键 * @param index 索引 index>=0时, 0 表头,1 第二个元素,依次类推;index<0时,-1,表尾,-2倒数第二个元素,依次类推 * @return */ public Object lGetIndex(String key, long index) { try { return redisTemplate.opsForList().index(key, index); } catch (Exception e) { e.printStackTrace(); return null; } } /** * 将list放入缓存 * * @param key 键 * @param value 值 * @return */ public boolean lSet(String key, Object value) { try { redisTemplate.opsForList().rightPush(key, value); return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 将list放入缓存 * * @param key 键 * @param value 值 * @param time 时间(秒) * @return */ public boolean lSet(String key, Object value, long time) { try { redisTemplate.opsForList().rightPush(key, value); if (time > 0) expire(key, time); return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 将list放入缓存 * * @param key 键 * @param value 值 * @return */ public boolean lSet(String key, List<Object> value) { try { redisTemplate.opsForList().rightPushAll(key, value); return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 将list放入缓存 * * @param key 键 * @param value 值 * @param time 时间(秒) * @return */ public boolean lSet(String key, List<Object> value, long time) { try { redisTemplate.opsForList().rightPushAll(key, value); if (time > 0) expire(key, time); return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 根据索引修改list中的某条数据 * * @param key 键 * @param index 索引 * @param value 值 * @return */ public boolean lUpdateIndex(String key, long index, Object value) { try { redisTemplate.opsForList().set(key, index, value); return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * 移除N个值为value * * @param key 键 * @param count 移除多少个 * @param value 值 * @return 移除的个数 */ public long lRemove(String key, long count, Object value) { try { Long remove = redisTemplate.opsForList().remove(key, count, value); return remove; } catch (Exception e) { e.printStackTrace(); return 0; } } //================有序集合 sort set=================== /** * 有序set添加元素 * * @param key * @param value * @param score * @return */ public boolean zSet(String key, Object value, double score) { return redisTemplate.opsForZSet().add(key, value, score); } public long batchZSet(String key, Set<ZSetOperations.TypedTuple> typles) { return redisTemplate.opsForZSet().add(key, typles); } public void zIncrementScore(String key, Object value, long delta) { redisTemplate.opsForZSet().incrementScore(key, value, delta); } public void zUnionAndStore(String key, Collection otherKeys, String destKey) { redisTemplate.opsForZSet().unionAndStore(key, otherKeys, destKey); } /** * 获取zset数量 * @param key * @param value * @return */ public long getZsetScore(String key, Object value) { Double score = redisTemplate.opsForZSet().score(key, value); if (score == null) { return 0; } else { return score.longValue(); } } /** * 获取有序集 key 中成员 member 的排名 。 * 其中有序集成员按 score 值递减 (从大到小) 排序。 * @param key * @param start * @param end * @return */ public Set<ZSetOperations.TypedTuple> getZSetRank(String key, long start, long end) { return redisTemplate.opsForZSet().reverseRangeWithScores(key, start, end); } }

__EOF__

本文作者阿布呦
本文链接https://www.cnblogs.com/weilx/p/15928328.html
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