求大神帮解决ftp上传图片到服务器的问题

public boolean upload(File file,XML xml1) throws Exception{
try {
bstate=0;
while(ftp==null || bstate<2)
{
sleep(500);
bstate=connect(xml1);
if(ftp==null || bstate<2){
System.out.println("连接服务器失败，请检查服务器是否开启！");
}
}
if(file.isDirectory()){
ftp.makeDirectory(file.getName());
ftp.changeWorkingDirectory(file.getName());
String[] files = file.list();
for (int i = 0; i < files.length; i++) {
File file1 = new File(file.getPath()+"\\"+files[i] );
if(file1.isDirectory()){
upload(file1,xml1);
ftp.changeToParentDirectory();
}else{
File file2 = new File(file.getPath()+"\\"+files[i]);
FileInputStream input = new FileInputStream(file2);
ftp.storeFile(file2.getName(), input);
input.close();
}
}
}else{
File file2 = new File(file.getPath());
FileInputStream input = new FileInputStream(file2);
ftp.storeFile(file2.getName(), input);
bsc=true;
input.close();
}

ftp.logout();
} catch (Exception e) {
e.printStackTrace();
}finally {
try {
ftp.disconnect();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
return bsc;
}

走到红色代码处，如果服务器断开了就没反应也不报错，调试也不往下走，这是什么原因？