fileupload源码分析

  private static String getUniqueId()

{

intcurrent;

synchronized(DefaultFileItem.class)

{

current=counter++;

}

Stringid=Integer.toString(current);

if(current<100000000)

{

id=("00000000"+id).substring(id.length());

}

returnid;

}

privatestaticStringgetUniqueId()

{

intcurrent;

synchronized(DefaultFileItem.class)

{

current=counter++;

}

Stringid=Integer.toString(current);

if(current<100000000)

{

id=("00000000"+id).substring(id.length());

}

returnid;

}

1.不要用""+整数来拼接字符串。调用Integer.toString高效

2.公有数据加同步保护

protectedFilegetTempFile()

{

FiletempDir=this.repository;

if(tempDir==null)

{

tempDir=newFile(System.getProperty("java.io.tmpdir"));

}

Stringfilename="upload_"+getUniqueId()+".tmp";

Filef=newFile(tempDir,fileName);

f.deleteOnExit();

returnf;

}

注意删除f.deleteOnExit在jvm退出的时候删除文件