filewriter

问题 I have a problem to write these detail in File. I am trying to write this detail in file but some how this function create File in specific location but its not writing anything into the file. public void writeBillToFile(double amount , double billingAmount,double taxAmount, double discount ,double transactionID , double billingNumber , int customerID , String tableNumber ,ArrayList listObject ) { FileWriter fw=null ; BufferedWriter bw =null; Date d=new Date(); long currentTimestamp=d.getTime

问题 How do I convert the FileWriter to OutputStreamWriter ? This is the directory that I stored the .java files. src/RX/example.java where RX is the package name. I inserted all the images and text files inside the same directory. Here is my working code with FileWriter. try { StringReader stringReader = new StringReader("Save this Message"); BufferedReader bufferedReader = new BufferedReader(stringReader); FileWriter fileWriter = new FileWriter("src/RX/rxUser.txt"); BufferedWriter bufferedWriter

问题 I have this Method that Lists the Files in a Directory and I need to write the same to a file. Apparently my System.out.println(); is able to list the files and their Sizes and the Dates they were Modified. But My bufferedWriter Does not write Anything in the File. Here is My Method; public void walk( String path, int limit ) throws IOException { File root = new File( path ); File[] list = root.listFiles(); File rep = new File("report.txt"); SimpleDateFormat sdf = new SimpleDateFormat("MMM/dd

问题 Im creating a log file system. the log file will be in json format so a server can read it after but i dont think thats too important. What i need to know is can log4j be configured to write into to a file but without any tags like info,debug, timestamp etc in the file. I have looked here but this polutes the file with with other things. I want ONLY the data i write to show up in the file. I'd also like to set some kind of file rotation on the file if it gets too big after a max size is

问题 I have a file saved that works fine apart from one problem. When the cancel button is pressed a copy of the file is saved in the java directory. This only happens when the cancel button is pressed, if the save button is used the file ends up where the user selects. How can I stop this happening so when the cancel button is pressed nothing is saved anywhere? My code is below, all help appreciated. Thanks // Save dialog private void savePlaylist() { JFileChooser savePlaylistDialog = new

问题 so what i am trying to accomplish is to write an array of data down each cell of the column for as many array elements that i have. i want i too look like this in excel: buyer | parts | price| quantity | comments tom | blah | 546 | 5 | blah | blah | 56 | 67 | my file has manyyyyy more columns than this but i wanted to give a brief example. what also creates my problem is that i dont want to print the next column after it on the last row that the writer is on once its done my array data set,

问题 I was testing out writing to files with this code: package files; import java.io.BufferedWriter; import java.io.File; import java.io.FileNotFoundException; import java.io.FileWriter; import java.io.IOException; public class FileTest1 { public static void main(String[] args) { try { try { File f = new File("filetest1.txt"); FileWriter fWrite = new FileWriter(f); BufferedWriter fileWrite = new BufferedWriter(fWrite); fileWrite.write("This is a test!"); } catch(FileNotFoundException e) { System

问题 How do I edit a file in pure js (without node)? I get a file with an input field and I read its text like this: var fileReader = new FileReader(); fileReader.readAsText(file); fileReader.onload = function () { alert(this.result); } So, pretty straight forward. I tried to look on the net how to use a fileWriter but with no success. I just need to edit the text inside that file and save it, how can I do? 回答1: You can't write files in a browser, you'll have to use node. 回答2: You can read in the

问题 I'm building iOS app with PhoneGap, need to write and read text file to the device. I followed the steps found here: http://docs.phonegap.com/en/2.0.0/guide_getting-started_ios_index.md.html#Getting%20Started%20with%20iOS Everything works fine, except I cannot use any of the API (I tried file and notification). I am calling: alert(navigator.fileMgr) but it's always undefined. I am calling that in the deviceready callback function. I think I missed some important steps, could anyone have

问题 I have the following code FileWriter F = new FileWriter("out.txt"); PrintWriter H = new PrintWriter(F); H.print(split[split.length - 2]); H.print("END"); When I examine the txt however, the last text is NOT 'END', but part of a word in the string. It is "repa" When I do this FileWriter F = new FileWriter("out.txt"); PrintWriter H = new PrintWriter(F); System.out.print(split[split.length - 2]); The last bit of text I get is the number '49' - this is correct. It appears that the PrintWriter is