Debug:
java.io.FileNotFoundException: E:\temp (拒絕訪問。)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
at java.io.FileWriter.<init>(FileWriter.java:73)
at TextFTPFileTran.downLoadText(TextFTPFileTran.java:140)
at TextFTPFileTran.actionPerformed(TextFTPFileTran.java:72)
解決辦法：
desFile = desFile + "\\" + souFile;//即在目標文件夾下要有完整的名稱，包括存儲路徑和文件名