Java工具类汇总

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ExcelUtils

public class ExcelUtils {
    /**
     * 注入的具有排序功能的handle
     */
    private static final SortRowWriteHandler SORT_ROW_WRITE_HANDLER = new SortRowWriteHandler();
    /**
     * 导出excel-指定excel表头列
     *
     * @param list     列表数据
     * @param clazz    列表项类
     * @param fileName 文件名称
     * @param response 响应
     * @param <T>      类
     */
    public static <T> void exportExcelInclude(List<T> list, Class<T> clazz, String fileName, HttpServletResponse response, List<String> includeTitleList) throws IOException {
        response.setContentType("application/vnd.ms-excel");
        response.setCharacterEncoding("utf-8");
        String exportFileName = createFileName(fileName);
        exportFileName = URLEncoder.encode(exportFileName, "UTF-8").replaceAll("\\+", "%20");
        response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + exportFileName + ".xlsx");
        response.setHeader("filename", exportFileName + ".xlsx");
        response.setHeader("Access-Control-Expose-Headers", "filename");
        HorizontalCellStyleStrategy horizontalCellStyleStrategy = new HorizontalCellStyleStrategy(ExcelStyleUtils.getHeadStyle(), ExcelStyleUtils.getContentStyle());
        ExcelCellWidthStyleStrategy widthStyleStrategy = new ExcelCellWidthStyleStrategy();

        ExcelWriterSheetBuilder excelWriterSheetBuilder = EasyExcel.write(response.getOutputStream(), clazz)
                .useDefaultStyle(Boolean.TRUE)
                .registerWriteHandler(horizontalCellStyleStrategy)
                .registerWriteHandler(widthStyleStrategy)
                .sheet(fileName);
        if (!CollectionUtils.isEmpty(includeTitleList)) {
            //存在包含的列时使用排序,将导出的文件按照指定的列进行排序
            excelWriterSheetBuilder.includeColumnFieldNames(includeTitleList)
                    //注入的具有排序功能的handle
                    .registerWriteHandler(SORT_ROW_WRITE_HANDLER)
                    .registerWriteHandler(horizontalCellStyleStrategy)
                    .registerWriteHandler(widthStyleStrategy);
        }
        excelWriterSheetBuilder.doWrite(list);
    }

    public static String createFileName(String type) {
        return type + "-" + LocalDateTime.now().format(DateTimeFormatter.ISO_LOCAL_DATE_TIME);
    }
}

RdisUtils

/**
 * Redis工具类
 */
@SuppressWarnings({"unused", "UnusedReturnValue", "ConstantConditions", "JavaDoc", "unchecked"})
@Slf4j
public class RedisOps {

    private final RedisTemplate<String, Object> redisTemplate;
    private final StringRedisSerializer stringRedisSerializer;

    public RedisOps(RedisTemplate<String, Object> redisTemplate, StringRedisSerializer stringRedisSerializer) {
        this.redisTemplate = redisTemplate;
        this.stringRedisSerializer = stringRedisSerializer;
    }

    public Set<String> keys() {
        return redisTemplate.keys("*");
    }

    public Set<String> keys(String pattern) {
        return redisTemplate.keys(pattern);
    }

    public void hset(Collection<RedisHash> list) {
        redisTemplate.executePipelined(
                (RedisCallback<List<Object>>) connection -> {
                    list.forEach(hash -> connection.hashCommands().hSet(
                            Objects.requireNonNull(stringRedisSerializer.serialize(hash.getKey())),
                            Objects.requireNonNull(stringRedisSerializer.serialize(hash.getField())),
                            Objects.requireNonNull(stringRedisSerializer.serialize(hash.getValue()))
                    ));
                    return null;
                }
        );
    }

    public void hset(String key, Map<String, String> map) {
        redisTemplate.executePipelined(
                (RedisCallback<List<Object>>) connection -> {
                    map.forEach((field, value) -> connection.hashCommands().hSet(
                            Objects.requireNonNull(stringRedisSerializer.serialize(key)),
                            Objects.requireNonNull(stringRedisSerializer.serialize(field)),
                            Objects.requireNonNull(stringRedisSerializer.serialize(value))
                    ));
                    return null;
                }
        );
    }

    /**
     * 指定缓存失效时间
     *
     * @param key  键
     * @param time 时间(秒)
     * @return boolean
     */
    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;
        }
    }

    /**
     * 根据 key 删除，适用于 Hash
     *
     * @param key 可以传一个值 或多个
     */
//    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));
//            }
//        }
//    }

    /**
     * 普通缓存获取
     *
     * @param key 键
     * @return 值
     */
    public Object get(String key) {
        Object object;
        try {
            object = key == null ? null : redisTemplate.opsForValue().get(key);
        } catch (Exception e) {
            log.error("failed to get redis: {}", key);
            throw e;
        }
        return object;
    }

    /**
     * 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);
    }

    /**
     * HashGet
     *
     * @param key  键 不能为null
     * @param item 项 不能为null
     * @return 值
     */
    public Object hget(String key, String item) {
        Assert.notNull(key, "key 不能为 null");
        Assert.notNull(item, "item 不能为 null");
        return redisTemplate.opsForHash().get(key, item);
    }

    /**
     * HashGet
     *
     * @param key  键 不能为null
     * @param item 项 不能为null
     * @return 值
     */
    public <T> T hgetJson(String key, String item, Class<T> tClass) {
        Object obj = hget(key, item);
        if (obj == null) return null;
        return JsonMapper.jsonToObject((String) obj, tClass);
    }

    public List<Object> multiGet(String key, List<String> hashKeys) {
        Assert.notNull(key, "key 不能为 null");
        Assert.notNull(hashKeys, "hashKeys 不能为 null");
        return redisTemplate.opsForHash().multiGet(key, new ArrayList<>(hashKeys));
    }

    public <T> List<T> multiGetJson(String key, List<String> hashKeys, Class<T> tClass) {
        Object obj = multiGet(key, hashKeys);
        if (obj == null) return null;
        return JsonMapper.jsonToList((String) obj, tClass);
    }

    /**
     * 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already exist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 {
            return redisTemplate.opsForSet().remove(key, values);
        } 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;
        }
    }

    public List<String> lGetAll(String key) {
        try {
            List<Object> list = lGet(key, 0, -1);
            return list.stream().map(Object::toString).collect(Collectors.toList());
        } 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 void lSet(String key, String value) {
        redisTemplate.opsForList().rightPush(key, value);
    }

    /**
     * 将list放入缓存
     *
     * @param key   键
     * @param value 值
     * @param time  时间(秒)
     * @return
     */
    public void lSet(String key, Object value, long time) {
        redisTemplate.opsForList().rightPush(key, value);
        if (time > 0)
            expire(key, time);
    }

    /**
     * 将list放入缓存
     *
     * @param key   键
     * @param value 值
     * @return
     */
    public void lSetList(String key, Collection<String> value) {
        redisTemplate.opsForList().rightPushAll(key, value.toArray());
    }

    /**
     * 将list放入缓存
     *
     * @param key   键
     * @param value 值
     * @param time  时间(秒)
     * @return
     */
    public void lSetList(String key, Collection<String> value, long time) {
        redisTemplate.opsForList().rightPushAll(key, value);
        if (time > 0)
            expire(key, time);
    }

    /**
     * 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 {
            return redisTemplate.opsForList().remove(key, count, value);
        } catch (Exception e) {
            e.printStackTrace();
            return 0;
        }
    }

    public void delete(String key) {
        redisTemplate.delete(key);
    }

    public void delete(Collection<String> keys) {
        redisTemplate.delete(keys);
    }

    public Set<String> hkeys(String key) {
        return redisTemplate.opsForHash().keys(key).stream()
                .map(Object::toString)
                .collect(Collectors.toSet());
    }

}

EmailUtil

@Component
public class EmailUtil {
    @Resource
    private JavaMailSender javaMailSender;

    @Resource
    private MailProperties mailProperties;

    public void sendSimpleMail( String to, String subject, String context) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(mailProperties.getUsername());
        message.setTo(to);
        message.setSubject(subject);
        message.setText(context);
        javaMailSender.send(message);
    }

    public void sendMimeMessage(String to, String subject, String text) throws MessagingException {
        MimeMessage message = javaMailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(message, true);
        helper.setFrom(mailProperties.getUsername());
        helper.setTo(to);
        helper.setSubject(subject);
        helper.setText(text, true);
        javaMailSender.send(message);
    }
}

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