bufferedwriter

问题 I have a program that converts Excel to CSV and I used 2 ways to do this: one of them uses CsvWriter write and the other program uses BufferedWriter write but the problem that I have encountered here is in order to write an Integer to a file you need to convert it to string with String.valueOf(myInt); but I need a pure Integer not a string because when I am trying to upload this file in Oracle database it throws me Ora-01722 invalid number exception I tried to create a CSV file from my

问题 I am reading a file using BufferedReader in java. Here are the sequence of operations that I am trying to do as reading the file Keep reading up to certain length of characters in the file Once it reads up to the length, do some manipuation on the read string Write the read string to a temp file Reset all the counters (ex. counter of the length) Go back #1 and do this again for rest of file What I am trying to figure out is #3. I want to append to temp file as I am writing to file using

问题 For some reason, when I create a new BufferedWriter and FileWriter in my program (Even if I haven't used it to write anything yet), it clears the file I have selected of all it's text. selectedFile is determined by a JFileChooser. public static File selectedFile; public static void Encrypt() throws Exception { try { //if I comment these two writers out the file is not cleared. FileWriter fw = new FileWriter(selectedFile.getAbsoluteFile()); BufferedWriter bw = new BufferedWriter(fw); List

问题 I would like to create a HTML file for my report. The content in the report can be created either by using BufferedWriter#write(String) File f = new File("source.htm"); BufferedWriter bw = new BufferedWriter(new FileWriter(f)); bw.write("Content"); or by using DataOutputStream#writeBytes(String) File f = new File("source.htm"); DataOutputStream dosReport = new DataOutputStream(new FileOutputStream(f)); dosReport.wrtiteBytes("Content"); Is one of them better than the other? Why is it so? 回答1:

问题 In android, I am writing a file on clicking a button and on clicking next time, it saves the file and closes the buffered writer. But, I also want to implement functionality to close the buffered writer in onDestroy function. Before that I need to know if Bufferedwriter is already closed. How will I check if Buffered Writer is already closed? In addition to that, does bufferedWriter.close() function set bufferedWriter to null ? 回答1: Calling close method on already closed Writer has no impact.

问题 I need to limit the file size to 1 GB while writing preferably using BufferedWriter . Is it possible using BufferedWriter or I have to use other libraries ? like try (BufferedWriter writer = Files.newBufferedWriter(path)) { //... writer.write(lines.stream()); } 回答1: You can always write your own OutputStream to limit the number of bytes written. The following assumes you want to throw exception if size is exceeded. public final class LimitedOutputStream extends FilterOutputStream { private

问题 I want to write a file results.txt to a specific directory on my machine (Z:\results to be precise). How do I go about specifying the directory to BufferedWriter/FileWriter? Currently, it writes the file successfully but to the directory where my source code is located. Thanks public void writefile(){ try{ Writer output = null; File file = new File("results.txt"); output = new BufferedWriter(new FileWriter(file)); for(int i=0; i<100; i++){ //CODE TO FETCH RESULTS AND WRITE FILE } output.close

问题 I Am using This Method to Read From a text file in JAR And Work Correctly. BufferedReader Bbr=new BufferedReader(new InputStreamReader(getClass().getResourceAsStream("AllBookRecords.txt"))); Now, I want to Write To a file (Delete a line from file, By writing from first file to second file without specific line). I use This code for do this: String Bookid=tf1.getText(); File Tf=new File("Boutput.txt"); URL myUrl=getClass().getResource("AllBookRecords.txt"); File file=new File(myUrl.toURI());

问题 I have to take name and address of user from user and put it into textfile. I write following code: package selfTest.nameAndAddress; import com.intellij.codeInsight.template.postfix.templates.SoutPostfixTemplate; import java.io.*; import java.util.Arrays; /** * Created by */ public class Test { public static void main(String[] args) throws IOException { InputStreamReader isr=new InputStreamReader(System.in); BufferedReader br=new BufferedReader(isr); //creating addressbook text file File fl

问题 For some reason this code results in a truncated text.txt file. It should (according to me) write out 1000 results, but the output file has various amounts of lines (depending on the run). Weirdly, the writing to the file stops in the middle of the write command, such that a line may not be complete. Currently, the last three lines of the text file for the latest run was as follows: 749, 78.97988, 97.80454, 99.6625, 94.00000015258789 750, 4.1745043, 86.64212, 107.59311, 71.00000008583069 751,