bufferedreader

问题 Is it possible to use BufferedReader to read from a text file, and then while buffered reader is reading, at the same time it also storing the lines it read to another txt file using PrintWriter? 回答1: If you use Java 7 and want to copy one file directly into another, it is as simple as: final Path src = Paths.get(...); final Path dst = Paths.get(...); Files.copy(src, dst); If you want to read line by line and write again, grab src and dst the same way as above, then do: final BufferedReader

问题 In this question, how do i stop reading input? My program just keeps running, asking for more input. public static void main(String[] args) throws Exception { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String src; while ((src = br.readLine()) != null) { String trgt = br.readLine(); //do something } } 回答1: Like this, public static void main(String[] args) throws Exception { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); String src;

问题 I am trying to read csv file full of text; however if there is a blank line in the middle somewhere, the whole thing breaks and I get a: java.lang.RuntimeException: java.lang.StringIndexOutOfBoundsException How would I go about removing/ignoring blank lines as long as it's not the end of the file? file = new FileReader(fileName); @SuppressWarnings("resource") BufferedReader reader = new BufferedReader(file); while ((line = reader.readLine()) != null) { //do lots of stuff to sort the data into

问题 This question already has answers here : Reading lines from an InputStream without buffering (3 answers) Closed 3 years ago . I have an InputStream which contains a line as a string and then binary data. If I read the line using new BufferedReader(new InputStreamReader(inputStream)) , the binary data is being also read and cannot be re-read. How can I read a line without reading the binary data as well? 回答1: * Update: It seems that InputStreamReader buffers (reads ahead) as well :( Posted

问题 What I wanted is to reach EOF by typing Ctrl + z from command line with BufferedReader reading from console. The following code does so. But the problem is, it issues a NullPointerException after reaching EOF . Is there a way to skip this exception? Or more precisely, what is the proper way of reaching EOF with BufferedReader reading from console? import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; class EOF { public static void main(String args[]) {

问题 I want to access the resources of a site created by prestashop via restful web services, which I enter the URL you must enter a key (that is generated by prestashop when we create a restful web service) in the field of username. so I am trying to read a xml string: <?xml version="1.0" encoding="UTF-8"?> <prestashop> <manufacturers> <manufacturer id="1" xlink:href="http://127.0.0.1/test/api/manufacturers/1" /> <manufacturer id="2" xlink:href="http://127.0.0.1/test/api/manufacturers/2" /> <

问题 Problem: I want to read a section of a file from HDFS and return it, such as lines 101-120 from a file of 1000 lines. I don't want to use seek because I have read that it is expensive. I have log files which I am using PIG to process down into meaningful sets of data. I've been writing an API to return the data for consumption and display by a front end. Those processed data sets can be large enough that I don't want to read the entire file out of Hadoop in one slurp to save wire time and

问题 I recently added SSL to my website and it can be accessed over https. Now when my java application tries to make requests to my website and read from it with a buffered reader it produces this stack trace Im not using a self signed certificate the cert is from Namecheap who uses COMODO SSL as the CA to sign my certificate. im using java 8 javax.net.ssl.SSLHandshakeException: No appropriate protocol (protocol is disabled or cipher suites are inappropriate) at sun.security.ssl.Handshaker

问题 In my client-server application, the client sends message to Server and the Server should display the message. But in my case, the client is only able to send but the server can't achieve it. I have tried with different port numbers (i.e. 8080, 8000, 4444 etc). It seems that the socket can set up the connection, but I really don't know why the server can't read the input from client. This is my complete project (I have ignored the main classes for both application here, because I have nothing

问题 new BufferedReader(new InputStreamReader( new GZIPInputStream(s3Service.getObject(bucket, objectKey).getDataInputStream()))) creates Reader that returns null from readLine() after ~100 lines if file is greater then several MB. Not reproducible on gzip files less then 1 MB. Does anybody knows how to handle this? 回答1: From the documentation of BufferedReader#readLine() : Returns: A String containing the contents of the line, not including any line-termination characters, or null if the end of