ライブラリ

Apache Commons

〇Commons Lang

org.apache.commons.lang.StringUtils

isAllLowerCase

isAllUpperCase

isAlpha

isAlphanumeric

isAlphanumericSpace

isAlphaSpace

isAsciiPrintable

isBlank

isEmpty

isNotBlank

isNotEmpty

isNumeric

isNumbericSpace

isWhitespace

StringUtils.isEmpty(str); // nullと""：true

StringUtils.isNumeric(str);

StringUtils.left(str, 2);

String repeated = StringUtils.repeat(str, 3);

int n = StringUtils.countMatches("11112222", "1"); // 文字列の数をカウント

WordUtils.capialize("ab de"); // Ab De

String j = StringUtils.join(new String[] { "a", "b", "c" }, ", "); // a, b, c

org.apache.commons.lang.StringEscapeUtils

escapeCsv

escapeHtml

escapeJava

escapeJavaScript

escapeSql

escapeXml

unescapeCsv

unescapeHtml

unescapeJava

unescapeJavaScript

unescapeXml

org.apache.commons.lang.RandomStringUtils

randomAlphabetic

randomAlphanumeric

randomAscii

random

RandomStringUtils.randomAlphabetic(10); // 長さ10のアルファベット文字列

RandomStringUtils.randomAscii(10); // 長さ10のASCII文字列

org.apache.commons.lang.ArrayUtils

arr = ArrayUtils.add(arr, 3);

arr = ArrayUtils.remove(arr, 2);

arr = ArrayUtils.subarray(arr, 1, 3);

arr = (String[]) ArrayUtils.clone(arr); // shallow

result = ArrayUtils.contains(arr, "xxx");

result = ArrayUtils.indexOf(arr, "xxx");

result = ArrayUtils.lastIndexOf(arr, "xxx");

result = ArrayUtils.isEmpty(arr);

result = ArrayUtils.isSameLength(arr1, arr2);

result = ArrayUtils.isEquals(arr1, arr2);

ArrayUtils.EMPTY_OBJECT_ARRAY

result = ArrayUtils.toPrimitive(arr); // Integer[]⇒int[]

result = ArrayUtils.toObject(arr); // int[]⇒Integer[]

String[][] countries = { { "Japan", "Tokyo" }, { "France", "Paris" } };

Map countryCapital = ArrayUtils.toMap(countries);

int[] combinedIntArray = ArrayUtils.addAll(intArray1, intArray2);

ArrayUtils.reverse(intArray);

int[] removed = ArrayUtils.removeElement(intArray, 3);//create a new array

org.apache.commons.lang.math.NumberUtils

num = NumberUtils.toInt(str);

num = NumberUtils.toInt(str, -1); // 失敗時に指定

num = NumberUtils.max(arr);

num = NumberUtils.min(arr);

org.apache.commons.lang.math.RandomUtils

num = RandomUtils.nextInt(10); // 0～9

org.apache.commons.lang.builder.*

class Person{

private String name;

private int age;

// getter/setter

@Override

public String toString() {

return new ToStringBuilder(this)

.append("名前", this.name)

.append("年齢", this.age)

.toString();

// 或いは

return ReflectionToStringBuilder.toString(this);

return ReflectionToStringBuilder.toString(this, ToStringStyle.MULTI_LINE_STYLE);

}

@Override

public boolean equals(Object obj) {

if(obj == null){

return false;

}

if(obj == this){

return true;

}

if(obj.getClass() != getClass()){

return false;

}

Person p = (Person)obj;

return new EqualsBuilder()

//.appendSuper(super.equals(obj))

.append(this.name, p.name)

.append(this.age, p.age)

.isEquals();

// 或いは

return EqualsBuilder.reflectionEquals(this, other);

}

@Override

public int hashCode() {

return new HashCodeBuilder()

.appand(this.name)

.appand(this.age)

.toHashCode();

// 或いは

return HashCodeBuilder.reflectionHashCode(this);

}

public class Employee implements Comparable<Employee> {

...

@Override

public int compareTo(Employee other) {

return new CompareToBuilder()

.appand(this.id, other.id)

.appand(this.name, other.name)

.toComparison();

// 或いは

return CompareToBuilder.reflectionCompare(this, other);

}

org.apache.commons.lang.time.DateUtils、DateFormatUtils

isSameDay(date1, date2)

date = DateUtils.parseDate("2013/01/01 12:45:36", new String[]{"yyyy/MM/dd HH:mm:ss"});

DateFormatUtils.format(new Date(), "yyyy/MM/dd HH:mm:ss");

org.apache.commons.lang.SystemUtils

System.getProperty("os.name");

↓

SystemUtils.OS_NAME

org.apache.commons.lang.ClassUtils

packageName = ClassUtils.getPackageName(String.class);

className = ClassUtils.getShortClassName(String.class);

List<Class> interfaces = ClassUtils.getAllInterfaces(String.class);

List<Class> superClass = ClassUtils.getAllSuperclasses(String.class);

org.apache.commons.lang.reflect.*

long time = ...;

Constructor<Date> constructor = Date.class.getConstructor(Long.TYPE);

Date date = constructor.newInstance(time);

↓

Date date = (Date) ConstructorUtils.invokeConstructor(Date.class, time);

Method method = Date.class.getMethod("after", Date.class);

boolean result = (boolean) method.invoke(date1, date2);

↓

boolean result = MethodUtils.invokeMethod(date1, "after", date2);

// staticメソッドの場合：invokeStaticMethod

Employee emp = new Employee();

Field field = Employee.class.getField("name");

field.set(emp, "Andy");

String name = (String) field.get(emp);

↓

FieldUtils.writeField(emp, "name", "Andy");

String name = (String) FieldUtils.readField(emp, "name");

org.apache.commons.lang.SerializationUtils

ByteArrayOutputStream out = new ByteArrayOutputStream();

ObjectOutputStream objOut = new ObjectOutputStream(out);

objOut.writeObject(person);

byte[] date = out.toByteArray();

ByteArrayInputStream in = new ByteArrayInputStream(date);

ObjectInputStream objIn = ObjectInputStream(in);

Person result = (Person) objIn.readObject();

↓

byte[] date = SerializationUtils.serialize(person);

Person result = (Person) SerializationUtils.deserialize(data);

org.apache.commons.lang.exception.ExceptionUtils

String stackTrace = ExceptionUtils.getStackTrace(ex);

String rootMessage = ExceptionUtils.getRootCauseMessage(ex);

Throwable t = ExceptionUtils.getRootCause(ex);

〇Commons BeanUtils

org.apache.commons.beanutils.BeanUtils

BeanUtils.setProperty(bean, "name", "Andy");

String name = BeanUtils.getProperty(bean, "name");

String[] elements = BeanUtils.getArrayProperty(bean, "array");

String element = BeanUtils.getIndexedProperty(bean, "array", 1);

String element = BeanUtils.getProperty(bean, "array[1]");

String element = BeanUtils.getMappedProperty(bean, "map", "key");

String element = BeanUtils.getProperty(bean, "map.key");

BeanUtils.copyProperties(dest, bean);

Employee clone = (Employee) BeanUtils.cloneBean(bean);

Map<String, String> map = BeanUtils.describe(bean); // bean⇒Map

BeanUtils.populate(bean, map); // Map⇒bean

※BeanUtils：アクセサメソッドに向け

※S2Util：publicフィールドに向け

〇Commons Collections

ListUtils, MapUtil

Seasar2のユーティリティ

〇S2BeanUtils（JavaBean、Mapなどをコピー）

org.seasar.framework.beans.util.Beans

SrcBean src = new SrcBean();

DestBean dest = new DestBean();

Beans.copy(src, dest).execute();

DestBean dest = Beans.createAndCopy(DestBean.class, src).execute();

Beans.copy(src, dest).excludes("foo", "bar").excludesNull().excludesWhitespace().execute();

Beans.copy(src, dest).includes("foo", "bar").execute();

Beans.copy(src, dest).prefix("to").execute();

DestBean dest = Beans.createAndCopy(DestBean.class, src).dateConverter("yyyy/MM/dd", "updateDate").execute();

dateConverter java.util.Date

sqlDateConverter java.sql.Date

timeConverter java.sql.Time

timestampConverter java.sql.Timestamp

numberConverter

〇HTTP関連

org.seasar.struts.util.RequestUtil、ResponseUtil、ServletContextUtil

HttpServletRequest getRequest()

String getPath()

HttpServletResponse getResponse()

void download(String fileName, byte[] data)

void download(String fileName, InputStream in)

void download(String fileName, InputStream in, int length)

void write(String text)

void write(String text, String contentType)

void write(String text, String contentType, String encoding)

ServletContextUtil getServlietContext()

String getViewPrefix()

〇文字列

org.seasar.framework.util.StringUtil

camelize / decamelize：USER_ID ⇔ UserId

capitalize / decapitalize：userId ⇔ UserId

contains

startsWithIgnoreCase / endsWithIgnoreCase

equals / equalsIgnoreCase

isBlank / isNotBlank

isEmpty / isNotEmpty

isNumber

ltrim / ltrim(String text, String trimText)

rtrim / rtrim(String text, String trimText)

replace

split

substringFromLast / substringToLast

trimPrefix / trimSuffix

〇配列

org.seasar.framework.util.ArrayUtil

add：配列にオブジェクト・配列を追加

contains

equalsIgnoreSequence

indexOf

isEmpty

remove

toList

toObjectArray

toString

〇コレクション

org.seasar.framework.util.tiger.Maps、Pair、Tuple3、Tuple4、Tuple5

Map<String, String> map = Maps.map("k1", "v1").$("k2", "v2").$("k3", "v3").$();

Pair<String, String> pair = Pair.pair("aaa", "bbb");

String first = pair.getFirst();

String second = pair.getSecond();

pair.setFirst("xxx");

pair.setSecond("yyy");

org.seasar.framework.util.tiger.IterableAdapter、EnumerationAdapter

Enumeration ⇔ Iterable・Iterator

for(String name : new IterableAdapter<String>(request.getParameterNames())) {

...

}

〇入出力関係

org.seasar.framework.util.FileUtil

void copy(File src, File dest)

byte[] getBytes(File file)

URL toURL(File file)

void write(String path, byte[] data)

void write(String path, byte[] data, int offset, int length)

byte[] data = FileUtil.getBytes(file);

FileUtil.write("D:/test.txt", data);

org.seasar.framework.util.InputStreamUtil、OutputStreamUtilなど

void close(InputStream is)

void copy(InputStream is, OutputStream os)

byte[] getBytes(InputStream is)

void reset(InputStream is)

〇リソース関連

org.seasar.framework.util.ResourceUtil

File bin = ResourceUtil.getBuildDir(XXX.class);

File jar = ResourceUtil.getBuildDir(S2Container.class); // Jarファイル

if(ResourceUtil.isExist("app.dicon")) {

File file = ResourceUtil.getResourceAsFile("app.dicon");

InputStream in = ResourceUtil.getResourceAsStream("app.dicon");

...

}

org.seasar.framework.util.MimeTypeUtil

String mimeType = MimeTypeUtil.guessContentType("env.txt");

org.seasar.framework.util.TextUtil

String readText(File file)

String readText(String path)

String readUTF8(File file)

String readUTF8(String path)

〇リフレクション関係

org.seasar.framework.util.ClassUtil、MethodUtil、FieldUtil

Method method = ClassUtil.getMethod(Hoge.class, "methodName", null);

Object result = MethodUtil.invoke(method, hoge, null);

Field field = ClassUtil.getField(Hoge.class, "fieldName");

FieldUtil.set(field, hoge, "xxx");]

org.seasar.framework.util.ReflectionUtil

Field field = ReflectionUtil.getDeclareField(this.getClass(), "fieldName");

Class<?> clazz = ReflectionUtil.getElementTypeOfCollectionFromFieldType(field);

org.seasar.framework.util.AnnotationUtil

Annotation[] annotations = obj.getClass().getAnnotations();

for(Annotation annotation : annotations) {

if(annotation.annotationType().getName().equals("xxx")) {

Map<String, Object> props = AnnotationUtil.getProperties(annotation);

...

}

〇その他

org.seasar.framework.util.Base64Util

String encoded = Base64Util.encode(data);

byte[] decoded = Base64Util.decode(encoded);

Lombok

http://projectlombok.org/

Eclipseで利用方法：

Step 1.java -jar lombok-1.12.2.jar

Step 2.Specify location: $ECLIPSE_HOME/eclipse

Step 3.Click Install/Update

Step 4.Restart Eclipse

<groupId>org.projectlombok</groupId>

<artifactId>lombok</artifactId>

<scope>provided</scope>

</dependency>

import com.google.common.collect.Lists;

import lombok.*;

@ToString(exclude="id")

@EqualsAndHashCode(exclude="id")

@Data

@NoArgsConstructor

@AllArgsConstructor

public class Test {

private final long id = 0L;

@Getter @Setter

private String name;

@Getter(AccessLevel.PROTECTED)

private int phone;

@Delegate

List<String> list = new ArrayList<String>();

val list = Lists.newArrayList();

public void hoge(String inputFile, String outputFile)

throws IOException {

@Cleanup InputStream in = new FileInputStream(inputFile);

@Cleanup OutputStream out = new FileOutputStream(outputFile);

...

}

@Synchronized

@SneakyThrows //発生する例外を非検査例外として扱う

public void read() {

FileReader in = new FileReader("data.txt");

...

}

注意点

@ToString

class Foo{

List<FooDetail> details;

}

@ToString(exclude="parent") // 循環参照を切る

class FooDetail{

Foo parent;

}

lombokで生成されたソースを出力する方法

<groupId>org.projectlombok</groupId>

<artifactId>lombok-maven-plugin</artifactId>

<id>delombok</id>

<phase>generate-sources</phase>

<goals>

<goal>delombok</goal>

</goals>

<addOutputDirectory>false</addOutputDirectory>

</configuration>

</execution>

<id>test-delombok</id>

<phase>generate-test-sources</phase>

<goals>

<goal>testDelombok</goal>

</goals>

<addOutputDirectory>false</addOutputDirectory>

</configuration>

</execution>

</executions>

<artifactId>tools</artifactId>

<scope>system</scope>

<systemPath>${java.home}/../lib/tools.jar</systemPath>

</dependency>

</dependencies>

</plugin>

RxJava

Functional Reactive Programming

https://github.com/Netflix/RxJava/wiki

ModelMapper

http://modelmapper.org/user-manual/

Deltaspike

CDIを拡張

https://deltaspike.apache.org/