Java

org.apache.commons.io.IOUtils

  1. closeQuietly()  
  2. toString()  
  3. copy()  
  4. toByteArray()  
  5. write()  
  6. toInputStream()  
  7. readLines()  
  8. copyLarge()  
  9. lineIterator()  
  10. readFully()

org.apache.commons.io.FileUtils

  1. deleteDirectory()  
  2. readFileToString()  
  3. deleteQuietly()  
  4. copyFile()  
  5. writeStringToFile()  
  6. forceMkdir()  
  7. write()  
  8. listFiles()  
  9. copyDirectory()  
  10. forceDelete()

org.apache.commons.lang.StringUtils

  1. isBlank()  
  2. isNotBlank()  
  3. isEmpty()  
  4. isNotEmpty()  
  5. equals()  
  6. join()  
  7. split()  
  8. EMPTY  
  9. trimToNull()  
  10. replace()
方法 说明
StringUtils.isEmpty 判断字符串是否为空
StringUtils.isNotEmpty 判断字符串是否非空
StringUtils.isBlank 判断字符串是否为空，为null或者size==0或者只存在空白字符(如””)，则返回true
StringUtils.isNotBlank 判断字符串是否为非空 
  1. //StringUtils.isEmpty
  2. System.out.println(StringUtils.isEmpty(""));  //true
  3. System.out.println(StringUtils.isEmpty("  "));  //false
  4. //StringUtils.isNotEmpty
  5. System.out.println(StringUtils.isNotEmpty(""));  //false
  7. //StringUtils.isBlank
  8. System.out.println(StringUtils.isBlank(""));  //true
  9. System.out.println(StringUtils.isBlank(" "));  //true
  10. //StringUtils.isNotBlank
  11. System.out.println(StringUtils.isNotBlank(" "));  //false

org.apache.http.util.EntityUtils

  1. toString()  
  2. consume()  
  3. toByteArray()  
  4. consumeQuietly()  
  5. getContentCharSet()

org.apache.commons.lang3.StringUtils

  1. isBlank()  
  2. isNotBlank()  
  3. isEmpty()  
  4. isNotEmpty()  
  5. join()  
  6. equals()  
  7. split()  
  8. EMPTY  
  9. replace()  
  10. capitalize()

org.apache.commons.io.FilenameUtils

  1. getExtension()  
  2. getBaseName()  
  3. getName()  
  4. concat()  
  5. removeExtension()  
  6. normalize()  
  7. wildcardMatch()  
  8. separatorsToUnix()  
  9. getFullPath()  
  10. isExtension()

org.springframework.util.StringUtils

  1. hasText()  
  2. hasLength()  
  3. isEmpty()  
  4. commaDelimitedListToStringArray()  
  5. collectionToDelimitedString()  
  6. replace()  
  7. delimitedListToStringArray()  
  8. uncapitalize()  
  9. collectionToCommaDelimitedString()  
  10. tokenizeToStringArray()

org.apache.commons.lang.ArrayUtils

  1. contains()  
  2. addAll()  
  3. clone()  
  4. isEmpty()  
  5. add()  
  6. EMPTY_BYTE_ARRAY  
  7. subarray()  
  8. indexOf()  
  9. isEquals()  
  10. toObject()

org.apache.commons.lang.StringEscapeUtils

  1. escapeHtml()  
  2. unescapeHtml()  
  3. escapeXml()  
  4. escapeSql()  
  5. unescapeJava()  
  6. escapeJava()  
  7. escapeJavaScript()  
  8. unescapeXml()  
  9. unescapeJavaScript()

org.apache.http.client.utils.URLEncodedUtils

  1. format()  
  2. parse()

org.apache.commons.codec.digest.DigestUtils

  1. md5Hex()  
  2. shaHex()  
  3. sha256Hex()  
  4. sha1Hex()  
  5. sha()  
  6. md5()  
  7. sha512Hex()  
  8. sha1()

org.apache.commons.collections.CollectionUtils

  1. isEmpty()  
  2. isNotEmpty()  
  3. select()  
  4. transform()  
  5. filter()  
  6. find()  
  7. collect()  
  8. forAllDo()  
  9. addAll()  
  10. isEqualCollection()
方法 说明
CollectionUtils.isEmpty 判断集合是否为空，为null或者size==0，返回true
CollectionUtils.isNotEmpty 判断集合是否为非空 
  1. List<Integer> emptyList = new ArrayList<>();
  2. List<Integer> nullList = null;
  3. List<Integer> notEmptyList = new ArrayList<>();
  4. notEmptyList.add(1);
  6. //CollectionUtils.isEmpty
  7. System.out.println(CollectionUtils.isEmpty(emptyList));   //true
  8. System.out.println(CollectionUtils.isEmpty(nullList));   //true
  9. System.out.println(CollectionUtils.isEmpty(notEmptyList));   //false
  11. //CollectionUtils.isNotEmpty
  12. System.out.println(CollectionUtils.isNotEmpty(emptyList));   //false
  13. System.out.println(CollectionUtils.isNotEmpty(nullList));   //false
  14. System.out.println(CollectionUtils.isNotEmpty(notEmptyList));   //true

org.apache.commons.lang3.ArrayUtils

  1. contains()  
  2. isEmpty()  
  3. isNotEmpty()  
  4. add()  
  5. clone()  
  6. addAll()  
  7. subarray()  
  8. indexOf()  
  9. EMPTY_OBJECT_ARRAY  
  10. EMPTY_STRING_ARRAY

org.apache.commons.beanutils.PropertyUtils

  1. getProperty()  
  2. setProperty()  
  3. getPropertyDescriptors()  
  4. isReadable()  
  5. copyProperties()  
  6. getPropertyDescriptor()  
  7. getSimpleProperty()  
  8. isWriteable()  
  9. setSimpleProperty()  
  10. getPropertyType()

org.apache.commons.lang3.StringEscapeUtils

  1. unescapeHtml4()  
  2. escapeHtml4()  
  3. escapeXml()  
  4. unescapeXml()  
  5. escapeJava()  
  6. escapeEcmaScript()  
  7. unescapeJava()  
  8. escapeJson()  
  9. escapeXml10()

org.apache.commons.beanutils.BeanUtils

  1. copyProperties()  
  2. getProperty()  
  3. setProperty()  
  4. describe()  
  5. populate()  
  6. copyProperty()  
  7. cloneBean()