opencsv

问题 I've added the open csv jar to my project to enable data to be written out to file in csv format. The jar file was added using the following steps: 1.Properties --> Add external jars --> opencsv-3.1.jar 2.Order & Eport tab --> tick, opencsv-3.1.jar But when I run the project I get an error stating that one of the methods belonging to the opencsv jar cannot be found: java.lang.NoClassDefFoundError: com.opencsv.CSVWriter Does anyone know how to resolve this error or am I missing some step in

问题 I just started with Java and have a lot of missing knowledge, but i need to write a simple class that will convert csv file using openCSV into a JavaBean. I have found some answers to similar quetions here, but none was able to help me. So far, a have come accross this bit of code: ColumnPositionMappingStrategy strat = new ColumnPositionMappingStrategy(); strat.setType(YourOrderBean.class); String[] columns = new String[] {"name", "orderNumber", "id"}; // the fields to bind do in your

问题 I have a text file that I use to store information of Items. 10325,Test1,Producto del Hogar,12,17 10425,Test2,Videojuegos,11,17 12345,Test3,Producto del Hogar,56,17.0 I'm using opencsv library to modify one column of the desired item, I'm using this code: public void updateCSV(String replace, int fila, int col) throws IOException { if (replace != null) { File archivoProductos = new File("productos.txt"); // Read existing file CSVReader reader = new CSVReader(new FileReader(archivoProductos),

问题 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

问题 I am reading a csv file using opencsv. I am ignoring the first line of; the csv file is tab separated with some values enclosed in double quotes. The problem occurs when I read the values of a column that has the '\' character, this is stripped out of the value. reader = new CSVReader(new FileReader(exchFileObj),'\t','"',1); For example in original file: address = 12\91buenosaires It becomes as: address = 1291buenosiares In the string array that csvreader generates. How do I modify it to be

问题 Here is the line i am using currently File booleanTopicFile; // booleanTopicFile is csv file uploaded from form CSVReader csvReader = new CSVReader(new InputStreamReader(new FileInputStream(booleanTopicFile), "UTF-8")); Want to skip the first line of the csv which contains headings. I dont want to use any separator as except the default one comma(,) which is already available in default constructor. In parameterized constructor there is a option to skip no. of lines but how to deal with the

问题 If I have a class with non-primitive public members and I want to populate them from a CSV file with OpenCSV, how can I do this? I notice that OpenCSV has some protected members relating to PropertyDescriptors So let's say I have a Person class that has an Address member, and my CSV file contains the detailsd for each person including their address.. Person{ private String name; private Address al public void setAddress(Address a){..} public void setName(String name){..} } Addess{ private

问题 I have an application in Java that I am using openCSV to read a file (very large). I am then putting the 4th (Eventually this will have another column or two added if that makes a difference) column into a HashSet and outputting that to a new file. This all seems to work fine but I discovered it is only reading part of the file (131,544 lines of 272,948). Is this a limitation of the openCSV or Java in general or is there a way to get around this? My code for reference: public static void main

问题 I have various CSVs that contain some standard columns and some completely random fields: firstname, lastname, dog_name, fav_hat, fav_color bill,smith,fido,porkpie,blue james,smith,rover,bowler,purple firstname, lastname, car_type, floor_number tom, collins, ford, 14 jim, jones, toyota, 120 So I'm trying to parse those into Person.class beans, which holds firstname & lastname, then I have a second class called PersonAttribute.class to hold...whatever else. The bastic outline of the two

问题 I'm populating a file from a resultSet like so : while(rs.next()){ String[] entries = new String[3]; entries[0] = rs.getString(1); entries[1] = ","; entries[2] = rs.getString(2); println("entries : "+entries); writer.writeNext(entries); } When I open the excel file the values contain double quotes around them. So test1,test2,test3 when read from the database and written to a .csv file becomes "test1","test2","test3" How can I write the text to file but not include the quotes ? When I print