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I am trying to print a large string(single line) into a file. But the string is getting truncated in between. Any idea on why this is happening?

void writeToFile(String schemaString,String message){ try{ FileWriter fw = new FileWriter("D:\\Servicelog.txt", true); java.util.Date date= new java.util.Date(); fw.write(new Timestamp(date.getTime())+"\n"); fw.write(message+"\n"); fw.write("schemaBegins\n"+schemaString+"\n"+"schemaEnds"); }catch(Exception e){ e.printStackTrace(); } }
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1 Answer 1

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12

You should remember to close the file.

FileWriter fw = null; try { fw = new FileWriter("D:\\Servicelog.txt", true); java.util.Date date = new java.util.Date(); fw.write(new Timestamp(date.getTime()) + "\n"); fw.write(message + "\n"); fw.write("schemaBegins\n" + schemaString + "\n" + "schemaEnds"); } catch (Exception e) { e.printStackTrace(); } finally { if ( fw != null ) { fw.close(); } }

Java7 and newer encapsulate that mechanism using try-with-resources:

try (FileWriter fw = new FileWriter("D:\\Servicelog.txt", true) ) { java.util.Date date = new java.util.Date(); fw.write(new Timestamp(date.getTime()) + "\n"); fw.write(message + "\n"); fw.write("schemaBegins\n" + schemaString + "\n" + "schemaEnds"); } catch (Exception e) { e.printStackTrace(); }

Writing to any Writer can be buffered, leaving some of the data unwritten if you do not close it.

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2 Comments

Calling fw.flush() will also flush the stream, if you don't want to close FileWriter right away for some reason.
I dont know how I missed it out. Thanks a lot for pointing it out to me. I was wasting my time analysing FileWrite, PrintWriter etc...

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