Yuhao.Chen (Howe) - 陈雨豪 HoweChen

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HoweChen / LinuxCommandExecutor.java

Created April 7, 2020 09:49

[LinuxCommandExecutor] #Java

	/**
	* @author howechen
	*/
	@Component
	public class SystemCommandExecutor {

	private static final Logger logger = LoggerFactory.getLogger(SystemCommandExecutor.class);
	private ExecuteWatchdog watchdog = new ExecuteWatchdog(60000);
	private PluginExecuteResultHandler resultHandler = new PluginExecuteResultHandler();

HoweChen / Pojo2JsonStr.java

Last active April 3, 2020 08:54

[POJO to json String] #Java

	public String toString() throws Exception {
	ObjectMapper mapper = new ObjectMapper();
	mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
	String result;
	try {
	result = mapper.writeValueAsString(this);
	} catch (JsonProcessingException e) {
	throw new Exception("Cannot transfer backend server info to json string");
	}

HoweChen / ZipToMap.java

Last active April 3, 2020 08:54

[两个list合并为一个map] #Java

	public static <K, V> Map<K, V> zipToMap(List<K> keyList, List<V> valueList) throws Exception {
	Map<K, V> result = new HashMap<>();
	Iterator<K> keyIterator = keyList.iterator();
	Iterator<V> valueIterator = valueList.iterator();
	while (keyIterator.hasNext() && valueIterator.hasNext()) {
	result.put(keyIterator.next(), valueIterator.next());
	}
	if (keyIterator.hasNext() \|\| valueIterator.hasNext()) {
	throw new Exception("The keyList and valueList size doesn't match.");
	}

HoweChen / PKCS7Padding.Java

Created April 1, 2020 06:58

[AES/CBC/PKCS7Padding加密解密] #Java

	// https://blog.csdn.net/java_zjh/article/details/80915655

	public final class AesUtils {
	private static final String CHARSET_NAME = "UTF-8";
	private static final String AES_NAME = "AES";
	public static final String ALGORITHM = "AES/CBC/PKCS7Padding";

	static {
	Security.addProvider(new BouncyCastleProvider());
	}

HoweChen / ListZipToMap.java

Last active January 1, 2020 09:14

[zip two lists to map]#Java

	// both are good to use, but cannot tolerate the situation when key or value inside the list is null

	public static <K, V> Map<K, V> zipToMap(List<K> keys, List<V> values) {
	return IntStream.range(0, keys.size()).boxed()
	.collect(Collectors.toMap(keys::get, values::get));
	}



	public static <K, V> Map<K, V> zipToMap(List<K> keys, List<V> values) {

HoweChen / IsValidEnum.java

Created December 18, 2019 08:27

[字符串是否是合法enum] #Java

	// should use org.apache.commons.lang3
	EnumUtils.isValidEnum(enumxxx.class,str);

HoweChen / TransferKeysInMapToUppercase.java

Created December 18, 2019 07:02

[转换Map里的所有key变为大写]#Java

	Map<String, List<Long>> capitalKeyToValueMap = procDefInfoDto.getPermissionToRole()
	.entrySet()
	.stream()
	.collect(Collectors.toMap(stringListEntry -> stringListEntry.getKey().toUpperCase(), Map.Entry::getValue));

HoweChen / ListOperation.java

Created December 10, 2019 07:23

[Java List 交并差集运算] #Java

	public class Test {

	public static void main(String[] args) {
	List<String> list1 = new ArrayList<String>();
	list1.add("1");
	list1.add("2");
	list1.add("3");
	list1.add("5");
	list1.add("6");

HoweChen / byte2HumanReadableSize.java

Created December 8, 2019 08:03

[文件大小转换byte to kb, mb, gb, pb, eb, zb ] #Java

	public static strictfp String humanReadableByteCount(long bytes, boolean si) {
	int unit = si ? 1000 : 1024;
	long absBytes = bytes == Long.MIN_VALUE ? Long.MAX_VALUE : Math.abs(bytes);
	if (absBytes < unit) return bytes + " B";
	int exp = (int) (Math.log(absBytes) / Math.log(unit));
	long th = (long) (Math.pow(unit, exp) * (unit - 0.05));
	if (exp < 6 && absBytes >= th - ((th & 0xfff) == 0xd00 ? 52 : 0)) exp++;
	String pre = (si ? "kMGTPE" : "KMGTPE").charAt(exp - 1) + (si ? "" : "i");
	if (exp > 4) {
	bytes /= unit;

HoweChen / queue2list.md

Created November 7, 2019 06:51

[Queue to List]#Java

List<?> list = new ArrayList<>( myQueue );

? can be be the class you want to transfer