问题描述
我正在尝试将一个 Csv 文件映射到一个对象,使用 CsvMapper 的对象列表有哪些实例,这可能吗?
示例:
字段 1:名称
字段 2:性别
字段 3:爱好(列表逗号分隔)
字段 4:关系
Bob;male;riding,swimming,dance;single
示例类:
@AllArgsConstructor(access = AccessLevel.PRIVATE)
Class User {
String name;
String gender;
List<Hobby> hobbys;
String relation;
Boolean check;
int index;
public static User from(String name,String gender,List<Hobby> hobbys,String relation) {
------ SOME LOGIC -----
return new User(name,gender,hobbys,relation,index)
}
}
Class UserCreator{
public List<User> create(File csvFile){
//Now my Problem how can I map the csvFile to User Object???
//my attempts
CsvMapper csvMapper = new CsvMapper();
CsvSchema csvSchema = CsvSchema
.emptySchema()
.withoutHeader()
.withColumnSeparator(',')
.withLineseparator(";");
try {
//here its crashes,my problem ist how can I map it to the User object?
MappingIterator<Map<String,String>> it = csvMapper.readerFor(Map.class)
.with(csvSchema)
.readValues(file);
System.out.println("test");
} catch (IOException e) {
e.printstacktrace();
}
}
}
提前致谢。
解决方法
我找到了一个解决方案: 我使用 common-cdv (apache) 作为插件而不是 Jackson CsvMapper。
我的解决方案:
public List<User> create(File csvFile){
Reader reader = new FileReader(file);
CSVParser csvParser = new CSVParser(reader,CSVFormat.DEFAULT.withDelimiter(';').withIgnoreEmptyLines());
csvParser.forEach(csvRecord -> {
String name = csvRecord.get(0);
String gender = csvRecord.get(1);
List<Hobby> hobbys = List.of(csvRecord.get(2).split(','));
String relation = csvRecord.get(3);
.......
});
csvParser.close();
}