opencsv

how to read utf-8 chars in opencsv

由 非 Y 不嫁゛ 提交于 2019-12-08 11:45:06
问题 I am trying to read from csv file. The file contains UTF-8 characters. So based on Parse CSV file containing a Unicode character using OpenCSV and How read Japanese fields from CSV file into java beans? I just wrote CSVReader reader = new CSVReader(new InputStreamReader(new FileInputStream("data.csv"), "UTF-8"), ';'); But it does not work. The >>Sí, es nuevo<< text is visible correctly in Notepad, Excel and various other text editing tools, but when I parse the file via opencsv I'm getting >

Read streaming data from csv using OpenCSV

由 泄露秘密 提交于 2019-12-07 00:36:39
I have Accelerometer and Gyro sensor streaming data which is saved in Download folder. I want to read all the data or line by line as the data stream in real time,but i am not able to go beyond first line. try { CSVReader reader = newCSVReader(newFileReader(path.getAbsoluteFile())); { List<String[]>allRows = reader.readAll(); for (String[]row :allRows) Log.i(TAG1,Arrays.toString(row)); } } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } in the output only first line is printed. I need to read each line so that i can do further operation.

StatefulBeanToCsv with Column headers

由 会有一股神秘感。 提交于 2019-12-05 19:47:20
问题 I am using opencsv-4.0 to write a csv file and I need to add column headers in output file. Here is my code. public static void buildProductCsv(final List<Product> product, final String filePath) { try { Writer writer = new FileWriter(filePath); // mapping of columns with their positions ColumnPositionMappingStrategy<Product> mappingStrategy = new ColumnPositionMappingStrategy<Product>(); // Set mappingStrategy type to Product Type mappingStrategy.setType(Product.class); // Fields in Product

Good and effective CSV/TSV Reader for Java

由 旧巷老猫 提交于 2019-12-05 01:36:11
I am trying to read big CSV and TSV (tab-separated) Files with about 1000000 rows or more. Now I tried to read a TSV containing ~2500000 lines with opencsv , but it throws me an java.lang.NullPointerException . It works with smaller TSV Files with ~250000 lines. So I was wondering if there are any other Libraries that support the reading of huge CSV and TSV Files. Do you have any ideas? Everybody who is interested in my Code (I shorten it, so Try-Catch is obviously invalid): InputStreamReader in = null; CSVReader reader = null; try { in = this.replaceBackSlashes(); reader = new CSVReader(in,

Is there any way to change value of a particular cell in a csv file in java?

由 ℡╲_俬逩灬. 提交于 2019-12-04 06:38:34
问题 I have gone through other questions regarding this on StackOverflow but libraries mentioned there only allow to read or write. Some of them do allow partial read or write like SuperCSV but no library can be used for updating value of a particular cell. Is there some other library that can be used or do I need to do it manually? 回答1: Read in the CSV, modify the cell you want, then write it back to the file. 回答2: No, there is no way to directly update the cell in CSV file. You can read CSV line

OpenCsv reading file with escaped separator

由 徘徊边缘 提交于 2019-12-04 06:29:56
问题 Am using opencsv 2.3 and it does not appear to be dealing with escape characters as I expect. I need to be able to handle an escaped separator in a CSV file that does not use quoting characters. Sample test code: CSVReader reader = new CSVReader(new FileReader("D:/Temp/test.csv"), ',', '"', '\\'); String[] nextLine; while ((nextLine = reader.readNext()) != null) { for (String string : nextLine) { System.out.println("Field [" + string + "]."); } } and the csv file: first field,second\,field

Angular 4: How to open CSV local file?

由 久未见 提交于 2019-12-04 06:16:15
问题 I would like to know how to open a CSV file using Angular 4. I found an example on the network, but it is not exactly what I need because in that case the file is downloaded from the server. I need to open the file locally, is it possible? I found this example: http://blog.sodhanalibrary.com/2016/10/read-csv-data-using-angular-2.html#.WYNdCnWGNp8 Thanks 回答1: you can load files from the client machine using Javascript FileReader object and (Angular 2+ indeed). import { Component } from '

How do I skip white-space only lines and lines having variable columns using supercsv

由 ◇◆丶佛笑我妖孽 提交于 2019-12-04 05:31:58
问题 I am working on CSV parser requirement and I am using supercsv parser library. My CSV file can have 25 columns(separated by tab(|)) and up to 100k rows with additional header row. I would like to ignore white-space only lines and lines containing less than 25 columns. I am using IcvBeanReader with name mappings(to set csv values to pojo) and field processors(to handle validations) for reading a file. I am assuming that Supercsv IcvBeanReader will skip white space lines by default. But how to

Why does all columns get created as string when I use OpenCSVSerde in Hive?

由 馋奶兔 提交于 2019-12-03 16:07:49
I am trying to create a table using the OpenCSVSerde and some integer and date columns. But the columns get converted to String. Is this an expected outcome? As a workaround, I do an explicit type-cast after this step (which makes the complete run slower) hive> create external table if not exists response(response_id int,lead_id int,creat_date date ) ROW FORMAT SERDE 'org.apache.hadoop.hive.serde2.OpenCSVSerde' WITH SERDEPROPERTIES ('quoteChar' = '"', 'separatorChar' = '\,', 'serialization.encoding'='UTF-8', 'escapeChar' = '~') location '/prod/hive/db/response' TBLPROPERTIES ("serialization

Editing CSV Files (Design Implementation)

由 我与影子孤独终老i 提交于 2019-12-02 14:51:02
问题 Im starting to design a program that will automate the process of finding and identifying strings correctly based on similar strings and their identities that have been found and saved into a master CSV/Excel file. Right now I want to design it properly so I dont run into issues later when implementing the CSV/Excel read writing part. I will probably use OpenCSV to write and read the files, so my question is more about how I can edit the file. Last time I dealt with editing CSV files I had to
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