CSV and set object are encapsulated based on Annotation

With the release of the project, the project is currently idle, so you can take the team to summarize and extract the components, tools, and practices that have been done well in this year's project, I will release it later. Today, it is mainly a simple maven small component that encapsulates opencsv Based on Annotation, this allows us to easily convert CSV files into List objects and Export List objects as CSV files.

The project hosting address is at github https://github.com/green?g/opencsv-utils.

You don't need to talk about the code. Let's take a look at how to use it.

Object

Package opencsv. utils;

Public class Person {

Private int id;

@ Csv ("person name ")
Private String name;

@ Ignore
Private int age;

Public Person (int id, String name, int age ){
This. id = id;
This. name = name;
This. age = age;
}

Public Person (){

}

Public int getId (){
Return id;
}

Public void setId (int id ){
This. id = id;
}

Public String getName (){
Return name;
}

Public void setName (String name ){
This. name = name;
}

Public int getAge (){
Return age;
}

Public void setAge (int age ){
This. age = age;
}
}

Mapping automatically uses fields without ignore as the CSV ing attribute name as the CSV column header. If special columns are used, @ CSV can be marked.
1: Read CSV:
(1) Annotation-based aning
@ Test
Public void shouldGetPersonFromCSV () throws Exception {
StringReader reader = new StringReader ("id, person name \ n1, name1 \ n2, name2 \ n ");
List <Person> personList = personCsvMapper
. WithMapping ("id", "id ")
. WithMapping ("person name", "name ")
. FromCsv (reader );

AssertThat (personList. size (), is (2 ));

Final Person first = personList. get (0 );
AssertThat (first. getId (), is (1 ));
AssertThat (first. getName (), is ("name1 "));

Final Person second = personList. get (1 );
AssertThat (second. getId (), is (2 ));
AssertThat (second. getName (), is ("name2 "));

}
  
  


(2) custom ing
@ Test
Public void shouldToCsv () throws Exception {
PersonCsvMapper. withMapping (new CsvColumnMapping (Person. class ));
Final ArrayList <Person> list = new ArrayList <Person> ();
List. add (new Person (1, "name1", 20 ));
List. add (new Person (2, "name2", 30 ));
Final StringWriter writer = new StringWriter ();

PersonCsvMapper. toCsv (writer, list );

Final String text = writer. toString ();
AssertThat (text, is ("id, person name \ n1, name1 \ n2, name2 \ n "));
}
2: CSV output
@ Test
Public void shouldGetPersonFromCsv () throws Exception {
StringReader reader = new StringReader ("id, person name \ n1, name1 \ n2, name2 \ n ");
List <Person> personList = new CsvMapper <Person> (Person. class)
. WithMapping (new CsvColumnMapping (Person. class ))
. FromCsv (reader );

AssertThat (personList. size (), is (2 ));

Final Person first = personList. get (0 );
AssertThat (first. getId (), is (1 ));
AssertThat (first. getName (), is ("name1 "));

Final Person second = personList. get (1 );
AssertThat (second. getId (), is (2 ));
AssertThat (second. getName (), is ("name2 "));

}

Finally, the hosted address is https://github.com/green?g/opencsv-utils. You don't need to talk about anything else.

This article from the "wolf" blog, please be sure to keep this source http://whitewolfblog.blog.51cto.com/3973901/1202150