Java常用工具类(自用)

java

自己做项目的一些统一配置

统一响应格式

Response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;

}

}

AppHttpCodeEnum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;

}

}

Bean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());

}

}

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());

}

}

redis

redis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;

}

}

redisUtil

@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 值

*/

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 值

*/

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);

}

}

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