Java/Apache Common/Bean Utils
Содержание
BeanUtil Array Utils Example
<source lang="java">
import org.apache.rumons.lang.ArrayUtils; public class ArrayUtilsExampleV1 {
public static void main(String args[]) {
long[] longArray = new long[] {10000, 30, 99};
String[] stringArray = new String[] {"abc", "def", "fgh"};
long[] clonedArray = ArrayUtils.clone(longArray);
System.err.println(
ArrayUtils.toString((ArrayUtils.toObject(clonedArray))));
System.err.println(ArrayUtils.indexOf(stringArray, "def"));
ArrayUtils.reverse(stringArray);
System.err.println(ArrayUtils.toString(stringArray));
}
}
</source>
BeanUtils Collections 2
<source lang="java">
import org.apache.rumons.beanutils.BeanPredicate; import org.apache.rumons.collections.PredicateUtils; public class BeanUtilsCollectionsV2 {
public static void main(String args[]) {
BeanPredicate predicate =
new BeanPredicate("title", PredicateUtils.uniquePredicate());
Movie movie = new Movie();
movie.setTitle("The Italian Job");
Movie movie1 = new Movie();
movie1.setTitle("The Italian Job");
System.err.println(predicate.evaluate(movie)); // evaluates true
System.err.println(predicate.evaluate(movie1)); // evaluates false
}
}
import java.util.Map; import java.util.List; import java.util.Date; public class Movie {
public Movie() {
}
public Date getDateOfRelease() { return this.dateOfRelease; }
public void setDateOfRelease(Date dateOfRelease) {
this.dateOfRelease = dateOfRelease;
}
public String getTitle() { return this.title; }
public void setTitle(String title) {this.title = title; }
public Person getDirector() { return this.director; }
public void setDirector(Person director) { this.director = director; }
public List getActors() { return this.actors; }
public void setActors(List actors) { this.actors= actors; }
public String[] getKeywords() { return this.keywords; }
public void setKeyWords(String[] keywords) { this.keywords = keywords; }
public Map getGenre() { return this.genre; }
public void setGenre(Map genre) { this.genre = genre; }
private Date dateOfRelease;
private String title;
private Person director;
private List actors;
private String[] keywords;
private Map genre;
}
import java.util.Map; import org.apache.rumons.lang.builder.EqualsBuilder; import org.apache.rumons.lang.builder.HashCodeBuilder; import org.apache.rumons.lang.builder.ToStringBuilder; public class Person {
public Person() {
}
public String getName() {
return this.name == null ? "NoName" : this.name; }
public void setName(String name) { this.name = name; }
public int getGender() { return this.gender; }
public void setGender(int gender) { // 0 - Indeterminate, 1 - Male, 2 - Female
this.gender = (gender > 2 || gender < 0) ? 0 : gender; }
public Map getContactNumber() { return this.contactNumber; }
public void setContactNumber(Map contactNumber) {
this.contactNumber = contactNumber;
}
/**public boolean equals(Object o) {
if(o == this) return true;
if(!(o instanceof Person)) return false;
Person otherPerson = (Person)o;
if(otherPerson.getName().equals(this.name) &&
otherPerson.getGender() == this.gender) return true;
return false;
}*/
public boolean equals(Object o) {
if(!(o instanceof Person)) return false;
Person otherPerson = (Person)o;
return new EqualsBuilder()
.append(name, otherPerson.getName())
.append(gender, otherPerson.getGender())
.isEquals();
}
public int hashCode() {
return new HashCodeBuilder(7, 51)
.append(name)
.append(gender)
.append(contactNumber)
.toHashCode();
}
public String toString() {
return new ToStringBuilder(this)
.append("Name", name)
.append("Gender", gender)
.append("Contact Details", contactNumber)
.toString();
}
private String name;
private int gender;
private Map contactNumber;
}
</source>
BeanUtils Date Utils
<source lang="java">
import org.apache.rumons.lang.time.DateUtils; import java.util.Date; import java.util.Calendar; import java.util.Iterator; import java.util.GregorianCalendar; public class DateUtilsV1 {
public static void main(String args[]) {
GregorianCalendar calendar = new GregorianCalendar(1974, 5, 25, 6, 30, 30);
Date date = calendar.getTime();
System.err.println("Original Date: " + date);
System.err.println("Rounded Date: " + DateUtils.round(date, Calendar.HOUR));
System.err.println("Truncated Date: " + DateUtils.truncate(date, Calendar.MONTH));
Iterator itr = DateUtils.iterator(date, DateUtils.RANGE_WEEK_MONDAY);
while(itr.hasNext()) {
System.err.println(((Calendar)itr.next()).getTime());
}
}
}
import java.util.Map; import java.util.List; import java.util.Date; public class Movie {
public Movie() {
}
public Date getDateOfRelease() { return this.dateOfRelease; }
public void setDateOfRelease(Date dateOfRelease) {
this.dateOfRelease = dateOfRelease;
}
public String getTitle() { return this.title; }
public void setTitle(String title) {this.title = title; }
public Person getDirector() { return this.director; }
public void setDirector(Person director) { this.director = director; }
public List getActors() { return this.actors; }
public void setActors(List actors) { this.actors= actors; }
public String[] getKeywords() { return this.keywords; }
public void setKeyWords(String[] keywords) { this.keywords = keywords; }
public Map getGenre() { return this.genre; }
public void setGenre(Map genre) { this.genre = genre; }
private Date dateOfRelease;
private String title;
private Person director;
private List actors;
private String[] keywords;
private Map genre;
}
import java.util.Map; import org.apache.rumons.lang.builder.EqualsBuilder; import org.apache.rumons.lang.builder.HashCodeBuilder; import org.apache.rumons.lang.builder.ToStringBuilder; public class Person {
public Person() {
}
public String getName() {
return this.name == null ? "NoName" : this.name; }
public void setName(String name) { this.name = name; }
public int getGender() { return this.gender; }
public void setGender(int gender) { // 0 - Indeterminate, 1 - Male, 2 - Female
this.gender = (gender > 2 || gender < 0) ? 0 : gender; }
public Map getContactNumber() { return this.contactNumber; }
public void setContactNumber(Map contactNumber) {
this.contactNumber = contactNumber;
}
/**public boolean equals(Object o) {
if(o == this) return true;
if(!(o instanceof Person)) return false;
Person otherPerson = (Person)o;
if(otherPerson.getName().equals(this.name) &&
otherPerson.getGender() == this.gender) return true;
return false;
}*/
public boolean equals(Object o) {
if(!(o instanceof Person)) return false;
Person otherPerson = (Person)o;
return new EqualsBuilder()
.append(name, otherPerson.getName())
.append(gender, otherPerson.getGender())
.isEquals();
}
public int hashCode() {
return new HashCodeBuilder(7, 51)
.append(name)
.append(gender)
.append(contactNumber)
.toHashCode();
}
public String toString() {
return new ToStringBuilder(this)
.append("Name", name)
.append("Gender", gender)
.append("Contact Details", contactNumber)
.toString();
}
private String name;
private int gender;
private Map contactNumber;
}
import java.util.List; public class Actor extends Person {
public Actor() {
}
public List getMovieCredits() { return this.movieCredits; }
public void setMovieCredits(List movieCredits) {
this.movieCredits = movieCredits;
}
public long getWorth() { return this.worth; }
public void setWorth(long worth) { this.worth = worth; }
private List movieCredits;
private long worth;
}
</source>
Bean Utils: deal with collections
<source lang="java">
import org.apache.rumons.beanutils.BeanUtils; import java.util.Map; import java.util.Date; import java.util.List; import java.util.HashMap; import java.util.ArrayList; import java.util.GregorianCalendar; public class BeanUtilsExampleV3 {
public static void main(String args[]) throws Exception {
BeanUtilsExampleV3 diff = new BeanUtilsExampleV3();
Actor actor = diff.prepareData();
Map describedData = BeanUtils.describe(actor);
// check the map
System.err.println(describedData.get("name"));
// change this value
describedData.put("name", "Robert Redford");
// create a new Actor Bean
Actor newActor = new Actor();
BeanUtils.populate(newActor, describedData);
System.err.println(BeanUtils.getProperty(newActor, "name"));
}
private Actor prepareData() {
Actor actor = new Actor();
actor.setName("Michael Caine");
actor.setGender(1);
actor.setWorth(10000000);
return actor;
}
}
import java.util.Map; import java.util.List; import java.util.Date; public class Movie {
public Movie() {
}
public Date getDateOfRelease() { return this.dateOfRelease; }
public void setDateOfRelease(Date dateOfRelease) {
this.dateOfRelease = dateOfRelease;
}
public String getTitle() { return this.title; }
public void setTitle(String title) {this.title = title; }
public Person getDirector() { return this.director; }
public void setDirector(Person director) { this.director = director; }
public List getActors() { return this.actors; }
public void setActors(List actors) { this.actors= actors; }
public String[] getKeywords() { return this.keywords; }
public void setKeyWords(String[] keywords) { this.keywords = keywords; }
public Map getGenre() { return this.genre; }
public void setGenre(Map genre) { this.genre = genre; }
private Date dateOfRelease;
private String title;
private Person director;
private List actors;
private String[] keywords;
private Map genre;
}
import java.util.Map; import org.apache.rumons.lang.builder.EqualsBuilder; import org.apache.rumons.lang.builder.HashCodeBuilder; import org.apache.rumons.lang.builder.ToStringBuilder; public class Person {
public Person() {
}
public String getName() {
return this.name == null ? "NoName" : this.name; }
public void setName(String name) { this.name = name; }
public int getGender() { return this.gender; }
public void setGender(int gender) { // 0 - Indeterminate, 1 - Male, 2 - Female
this.gender = (gender > 2 || gender < 0) ? 0 : gender; }
public Map getContactNumber() { return this.contactNumber; }
public void setContactNumber(Map contactNumber) {
this.contactNumber = contactNumber;
}
/**public boolean equals(Object o) {
if(o == this) return true;
if(!(o instanceof Person)) return false;
Person otherPerson = (Person)o;
if(otherPerson.getName().equals(this.name) &&
otherPerson.getGender() == this.gender) return true;
return false;
}*/
public boolean equals(Object o) {
if(!(o instanceof Person)) return false;
Person otherPerson = (Person)o;
return new EqualsBuilder()
.append(name, otherPerson.getName())
.append(gender, otherPerson.getGender())
.isEquals();
}
public int hashCode() {
return new HashCodeBuilder(7, 51)
.append(name)
.append(gender)
.append(contactNumber)
.toHashCode();
}
public String toString() {
return new ToStringBuilder(this)
.append("Name", name)
.append("Gender", gender)
.append("Contact Details", contactNumber)
.toString();
}
private String name;
private int gender;
private Map contactNumber;
}
import java.util.List; public class Actor extends Person {
public Actor() {
}
public List getMovieCredits() { return this.movieCredits; }
public void setMovieCredits(List movieCredits) {
this.movieCredits = movieCredits;
}
public long getWorth() { return this.worth; }
public void setWorth(long worth) { this.worth = worth; }
private List movieCredits;
private long worth;
}
</source>
BeanUtils get Property from Dynamic Beans
<source lang="java">
import org.apache.rumons.beanutils.DynaBean; import org.apache.rumons.beanutils.DynaClass; import org.apache.rumons.beanutils.BeanUtils; import org.apache.rumons.beanutils.LazyDynaBean; import org.apache.rumons.beanutils.DynaProperty; import org.apache.rumons.beanutils.BasicDynaClass; import java.util.Map; import java.util.List; import java.util.Date; import java.util.HashMap; import java.util.GregorianCalendar; public class DynaBeansExampleV1 {
public static void main(String args[]) throws Exception {
Object movie = createMovieBean();
System.err.println(BeanUtils.getProperty(movie, "title"));
System.err.println(BeanUtils.getProperty(movie, "director.name"));
}
private static Object createMovieBean() throws Exception {
// first create the properties
DynaProperty properties[] = new DynaProperty[] {
new DynaProperty("title", String.class),
new DynaProperty("dateOfRelease", Date.class),
new DynaProperty("keywords", String[].class),
new DynaProperty("genre", Map.class),
new DynaProperty("actors", List.class),
new DynaProperty("director", DynaBean.class)
};
// next using the properties define the class
DynaClass movieClass = new BasicDynaClass("movie", null, properties);
// now, with the class, create a new instance
DynaBean movieBean = movieClass.newInstance();
// set its properties
movieBean.set("title", "The Italian Job");
movieBean.set("dateOfRelease",
new GregorianCalendar(1969, 0, 1).getTime());
movieBean.set("keywords", new String[] {"Italy", "Bank Robbery"});
Map genre = new HashMap();
genre.put("THR", "Thriller");
movieBean.set("genre", genre);
movieBean.set("genre", "ACT", "Action");
DynaBean director = createPersonBean();
director.set("name", "Peter Collinson");
director.set("gender", new Integer(1));
movieBean.set("director", director);
return movieBean;
}
private static DynaBean createPersonBean() {
DynaBean person = new LazyDynaBean();
return person;
}
}
</source>
Get Mapped Property
<source lang="java">
import java.util.Map; import java.util.HashMap; import java.util.Iterator; import java.lang.reflect.Method; import org.apache.rumons.collections.Bag; import org.apache.rumons.collections.bag.HashBag; import org.apache.rumons.beanutils.BeanUtils; import org.apache.rumons.beanutils.PropertyUtils; import org.apache.rumons.lang.StringUtils; public class TasteOfThingsV1 {
private static Map testMap;
private static TestBean testBean;
public static void main(String args[]) throws Exception {
prepareData();
HashBag myBag = new HashBag(testMap.values());
System.err.println("How many Boxes? " + myBag.getCount("Boxes"));
myBag.add("Boxes", 5);
System.err.println("How many Boxes now? " + myBag.getCount("Boxes"));
Method method =
testBean.getClass().getDeclaredMethod("getTestMap", new Class[0]);
HashMap reflectionMap =
(HashMap)method.invoke(testBean, new Object[0]);
System.err.println("The value of the "squ" key using reflection: " +
reflectionMap.get("squ"));
String squ = BeanUtils.getMappedProperty(testBean, "testMap", "squ");
squ = StringUtils.capitalize(squ);
PropertyUtils.setMappedProperty(testBean, "testMap", "squ", squ);
System.err.println("The value of the "squ" key is: " +
BeanUtils.getMappedProperty(testBean, "testMap", "squ"));
String box = (String)testMap.get("box");
String caps =
Character.toTitleCase(box.charAt(0)) +
box.substring(1, box.length());
System.err.println("Capitalizing boxes by Java: " + caps);
}
private static void prepareData() {
testMap = new HashMap();
testMap.put("box", "boxes");
testMap.put("squ", "squares");
testMap.put("rect", "rectangles");
testMap.put("cir", "circles");
testBean = new TestBean();
testBean.setTestMap(testMap);
}
}
import java.util.Map; import java.util.HashMap; public class TestBean {
private Map testMap;
public Map getTestMap() {
return this.testMap;
}
public void setTestMap(Map testMap) {
this.testMap = testMap;
}
}
</source>
Use Bean Utils to get property value from object
<source lang="java">
import org.apache.rumons.beanutils.BeanUtils; import java.util.Map; import java.util.Date; import java.util.List; import java.util.HashMap; import java.util.ArrayList; import java.util.GregorianCalendar; public class BeanUtilsExampleV1 {
public static void main(String args[]) throws Exception {
BeanUtilsExampleV1 diff = new BeanUtilsExampleV1();
Movie movieBean = diff.prepareData();
System.err.println("Movie Title: " +
BeanUtils.getProperty(movieBean, "title"));
System.err.println("Movie Year: " +
BeanUtils.getProperty(movieBean, "dateOfRelease"));
System.err.println("Movie Director: " +
BeanUtils.getProperty(movieBean, "director.name"));
System.err.println("Movie Director Home Contact: " +
BeanUtils.getProperty(movieBean, "director.contactNumber(Home)"));
System.err.println("Movie Genre (Thriller): " +
BeanUtils.getProperty(movieBean, "genre(THR)"));
System.err.println("Movie Actor 1 name: " +
BeanUtils.getProperty(movieBean, "actors[0].name"));
System.err.println("Movie Actor 1 worth: " +
BeanUtils.getProperty(movieBean, "actors[0].worth"));
System.err.println("Movie Actor 1 other movie 1: " +
BeanUtils.getProperty(movieBean, "actors[0].movieCredits[0].title"));
}
private Movie prepareData() {
Movie movie = new Movie();
movie.setTitle("The Italian Job");
movie.setDateOfRelease(new GregorianCalendar(1969, 0, 1).getTime());
// sets the genre
Map genre_map = new HashMap();
genre_map.put("THR", "Thriller");
genre_map.put("ACT", "Action");
movie.setGenre(genre_map);
// creates the Director
Person director = new Person();
director.setName("Peter Collinson");
director.setGender(1);
Map director_contacts = new HashMap();
director_contacts.put("Home", "99922233");
director_contacts.put("Mobile", "0343343433");
director.setContactNumber(director_contacts);
movie.setDirector(director);
// create the actors
Actor actor1 = new Actor();
actor1.setName("Michael Caine");
actor1.setGender(1);
actor1.setWorth(10000000);
List actor1_movies = new ArrayList();
Movie movie2 = new Movie();
movie2.setTitle("The Fourth Protocol");
Movie movie3 = new Movie();
movie3.setTitle("Shiner");
actor1_movies.add(movie2);
actor1_movies.add(movie3);
actor1.setMovieCredits(actor1_movies);
Actor actor2 = new Actor();
actor2.setName("Margaret Blye");
actor2.setGender(2);
actor2.setWorth(20000000);
List actors = new ArrayList();
actors.add(actor1);
actors.add(actor2);
movie.setActors(actors);
return movie;
}
}
import java.util.List; public class Actor extends Person {
public Actor() {
}
public List getMovieCredits() { return this.movieCredits; }
public void setMovieCredits(List movieCredits) {
this.movieCredits = movieCredits;
}
public long getWorth() { return this.worth; }
public void setWorth(long worth) { this.worth = worth; }
private List movieCredits;
private long worth;
}
import java.util.Map; import java.util.List; import java.util.Date; public class Movie {
public Movie() {
}
public Date getDateOfRelease() { return this.dateOfRelease; }
public void setDateOfRelease(Date dateOfRelease) {
this.dateOfRelease = dateOfRelease;
}
public String getTitle() { return this.title; }
public void setTitle(String title) {this.title = title; }
public Person getDirector() { return this.director; }
public void setDirector(Person director) { this.director = director; }
public List getActors() { return this.actors; }
public void setActors(List actors) { this.actors= actors; }
public String[] getKeywords() { return this.keywords; }
public void setKeyWords(String[] keywords) { this.keywords = keywords; }
public Map getGenre() { return this.genre; }
public void setGenre(Map genre) { this.genre = genre; }
private Date dateOfRelease;
private String title;
private Person director;
private List actors;
private String[] keywords;
private Map genre;
}
import java.util.Map; import org.apache.rumons.lang.builder.EqualsBuilder; import org.apache.rumons.lang.builder.HashCodeBuilder; import org.apache.rumons.lang.builder.ToStringBuilder; public class Person {
public Person() {
}
public String getName() {
return this.name == null ? "NoName" : this.name; }
public void setName(String name) { this.name = name; }
public int getGender() { return this.gender; }
public void setGender(int gender) { // 0 - Indeterminate, 1 - Male, 2 - Female
this.gender = (gender > 2 || gender < 0) ? 0 : gender; }
public Map getContactNumber() { return this.contactNumber; }
public void setContactNumber(Map contactNumber) {
this.contactNumber = contactNumber;
}
/**public boolean equals(Object o) {
if(o == this) return true;
if(!(o instanceof Person)) return false;
Person otherPerson = (Person)o;
if(otherPerson.getName().equals(this.name) &&
otherPerson.getGender() == this.gender) return true;
return false;
}*/
public boolean equals(Object o) {
if(!(o instanceof Person)) return false;
Person otherPerson = (Person)o;
return new EqualsBuilder()
.append(name, otherPerson.getName())
.append(gender, otherPerson.getGender())
.isEquals();
}
public int hashCode() {
return new HashCodeBuilder(7, 51)
.append(name)
.append(gender)
.append(contactNumber)
.toHashCode();
}
public String toString() {
return new ToStringBuilder(this)
.append("Name", name)
.append("Gender", gender)
.append("Contact Details", contactNumber)
.toString();
}
private String name;
private int gender;
private Map contactNumber;
}
</source>
