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Re:io问题 [Re:joelwx]

bohui0714

发贴: 9
积分: 0

于 2005-07-10 20:55

//PrintStream ps=new PrintStream(new FileOutputStream(file));
PrintStream ps=new PrintStream(new FileOutputStream(file,true));

FileOutputStream
public FileOutputStream(File file,
boolean append)
throws FileNotFoundException
Creates a file output stream to write to the file represented by the specified File object. If the second argument is true, then bytes will be written to the end of the file rather than the beginning. A new FileDescriptor object is created to represent this file connection.
First, if there is a security manager, its checkWrite method is called with the path represented by the file argument as its argument.

If the file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason then a FileNotFoundException is thrown.

Parameters:
file - the file to be opened for writing.
append - if true, then bytes will be written to the end of the file rather than the beginning
Throws:
FileNotFoundException - if the file exists but is a directory rather than a regular file, does not exist but cannot be created, or cannot be opened for any other reason
SecurityException - if a security manager exists and its checkWrite method denies write access to the file.
Since:
1.4

话题树型展开

人气	标题	作者	字数	发贴时间
9244	io问题(new PrintStream总把上次的数据清空)	joelwx	150	2005-07-09 10:12
7288	Re:io问题	bohui0714	1332	2005-07-10 20:55
7156	Re:io问题	joelwx	5	2005-07-11 08:19
7130	Re:io问题	Destroyer	15	2005-08-30 07:25
7389	Re:io问题	SUPLAD	48	2005-09-13 17:04
7439	Re:io问题	why	290	2005-09-13 23:50

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