我要评论java 文件锁的简单实现
java文件锁的功能，隐私文件及安全性的提升，实现起来不难，这里贴下实现代码：
实例代码：
import java.io.file;
import java.io.fileinputstream;
import java.io.filenotfoundexception;
import java.io.ioexception;
import java.io.inputstreamreader;
import java.io.randomaccessfile;
import java.nio.channels.filechannel;
import java.nio.channels.filelock;
public class filelocker {
public static void main(string[] args) throws ioexception {
file f = new file("aaa.txt");
system.out.println(getfilecontent(f) + 1);// no lock
filelock lock = getfilelock(f);// lock
system.out.println(getfilecontent(f) + 2);
lock.release();// lock release
system.out.println(getfilecontent(f) + 3);// no lock
}
/**
* get file content.
*
* @param file
* @return
*/
public static string getfilecontent(file file) {
string line = "";
string content = "";
try {
bufferedreader bf = new bufferedreader(new inputstreamreader(
new fileinputstream(file)));
while ((line = bf.readline()) != null) {
content += line;
}
} catch (filenotfoundexception e) {
content = "error ";
} catch (ioexception e) {
content = "error ";
}
return content;
}
/**
* get lock.
*
* @param file
* @return
* @throws ioexception
*/
public static filelock getfilelock(file file) throws ioexception {
randomaccessfile fi = new randomaccessfile(file, "rw");
filechannel fc = fi.getchannel();
return fc.trylock();
}
}
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