java_io_EOFException该如何使用

问题分析：
当输入过程中意外到达文件或流的末尾时，抛出此异常。此异常主要被数据输入流用来表明到达流的末尾。
解决方案：
因为不知道流的末尾，当到达末尾的时候，抛出了此异常。这种异常主要被数据输入流用来表明到达流的末尾，建议捕获异常并退出读取输入流。
示例：

1. [backcolor=transparent]  java[backcolor=transparent].[backcolor=transparent]io[backcolor=transparent].[backcolor=transparent]EOFException
2. [backcolor=transparent]    at libcore[backcolor=transparent].[backcolor=transparent]io[backcolor=transparent].[backcolor=transparent]Streams[backcolor=transparent].[backcolor=transparent]readAsciiLine[backcolor=transparent]([backcolor=transparent]Streams[backcolor=transparent].[backcolor=transparent]java[backcolor=transparent]:[backcolor=transparent]203[backcolor=transparent])
3. [backcolor=transparent]    at libcore[backcolor=transparent].[backcolor=transparent]net[backcolor=transparent].[backcolor=transparent]http[backcolor=transparent].[backcolor=transparent]HttpEngine[backcolor=transparent].[backcolor=transparent]readResponseHeaders[backcolor=transparent]([backcolor=transparent]HttpEngine[backcolor=transparent].[backcolor=transparent]java[backcolor=transparent]:[backcolor=transparent]579[backcolor=transparent])
4. [backcolor=transparent]    at libcore[backcolor=transparent].[backcolor=transparent]net[backcolor=transparent].[backcolor=transparent]http[backcolor=transparent].[backcolor=transparent]HttpEngine[backcolor=transparent].[backcolor=transparent]readResponse[backcolor=transparent]([backcolor=transparent]HttpEngine[backcolor=transparent].[backcolor=transparent]java[backcolor=transparent]:[backcolor=transparent]827[backcolor=transparent])
5. [backcolor=transparent]    at libcore[backcolor=transparent].[backcolor=transparent]net[backcolor=transparent].[backcolor=transparent]http[backcolor=transparent].[backcolor=transparent]HttpURLConnectionImpl[backcolor=transparent].[backcolor=transparent]getResponse[backcolor=transparent]([backcolor=transparent]HttpURLConnectionImpl[backcolor=transparent].[backcolor=transparent]java[backcolor=transparent]:[backcolor=transparent]283[backcolor=transparent])
6. [backcolor=transparent]    at libcore[backcolor=transparent].[backcolor=transparent]net[backcolor=transparent].[backcolor=transparent]http[backcolor=transparent].[backcolor=transparent]HttpURLConnectionImpl[backcolor=transparent].[backcolor=transparent]getInputStream[backcolor=transparent]([backcolor=transparent]HttpURLConnectionImpl[backcolor=transparent].[backcolor=transparent]java[backcolor=transparent]:[backcolor=transparent]177[backcolor=transparent])

1. [backcolor=transparent]  [backcolor=transparent]public[backcolor=transparent] [backcolor=transparent]static[backcolor=transparent] [backcolor=transparent]void[backcolor=transparent] main[backcolor=transparent]([backcolor=transparent]String[backcolor=transparent][][backcolor=transparent] args[backcolor=transparent])[backcolor=transparent] [backcolor=transparent]{
2. [backcolor=transparent]      [backcolor=transparent]DataInputStream[backcolor=transparent] input [backcolor=transparent]=[backcolor=transparent] [backcolor=transparent]null[backcolor=transparent];
3. [backcolor=transparent]      [backcolor=transparent]try[backcolor=transparent] [backcolor=transparent]{
4. [backcolor=transparent]        [backcolor=transparent]//do something
6. [backcolor=transparent]        [backcolor=transparent]// Read all characters, until an EOFException is thrown.
7. [backcolor=transparent]        input [backcolor=transparent]=[backcolor=transparent] [backcolor=transparent]new[backcolor=transparent] [backcolor=transparent]DataInputStream[backcolor=transparent]([backcolor=transparent]new[backcolor=transparent] [backcolor=transparent]FileInputStream[backcolor=transparent]([backcolor=transparent]FILENAME[backcolor=transparent]));
8. [backcolor=transparent]        [backcolor=transparent]while[backcolor=transparent]([backcolor=transparent]true[backcolor=transparent])[backcolor=transparent] [backcolor=transparent]{
9. [backcolor=transparent]          [backcolor=transparent]char[backcolor=transparent] num[backcolor=transparent];
10. [backcolor=transparent]          [backcolor=transparent]try[backcolor=transparent] [backcolor=transparent]{
11. [backcolor=transparent]            num [backcolor=transparent]=[backcolor=transparent] input[backcolor=transparent].[backcolor=transparent]readChar[backcolor=transparent]();
12. [backcolor=transparent]            [backcolor=transparent]System[backcolor=transparent].[backcolor=transparent]out[backcolor=transparent].[backcolor=transparent]println[backcolor=transparent]([backcolor=transparent]"Reading from file: "[backcolor=transparent] [backcolor=transparent]+[backcolor=transparent] num[backcolor=transparent]);
13. [backcolor=transparent]          [backcolor=transparent]}
14. [backcolor=transparent]          [backcolor=transparent]catch[backcolor=transparent] [backcolor=transparent]([backcolor=transparent]EOFException[backcolor=transparent] ex1[backcolor=transparent])[backcolor=transparent] [backcolor=transparent]{
15. [backcolor=transparent]            [backcolor=transparent]break[backcolor=transparent];[backcolor=transparent] [backcolor=transparent]//EOF reached.
16. [backcolor=transparent]          [backcolor=transparent]}
17. [backcolor=transparent]          [backcolor=transparent]catch[backcolor=transparent] [backcolor=transparent]([backcolor=transparent]IOException[backcolor=transparent] ex2[backcolor=transparent])[backcolor=transparent] [backcolor=transparent]{
18. [backcolor=transparent]            [backcolor=transparent]System[backcolor=transparent].[backcolor=transparent]err[backcolor=transparent].[backcolor=transparent]println[backcolor=transparent]([backcolor=transparent]"An IOException was caught: "[backcolor=transparent] [backcolor=transparent]+[backcolor=transparent] ex2[backcolor=transparent].[backcolor=transparent]getMessage[backcolor=transparent]());
19. [backcolor=transparent]            ex2[backcolor=transparent].[backcolor=transparent]printStackTrace[backcolor=transparent]();
20. [backcolor=transparent]          [backcolor=transparent]}
21. [backcolor=transparent]        [backcolor=transparent]}
22. [backcolor=transparent]      [backcolor=transparent]}
23. [backcolor=transparent]      [backcolor=transparent]catch[backcolor=transparent] [backcolor=transparent]([backcolor=transparent]IOException[backcolor=transparent] ex[backcolor=transparent])[backcolor=transparent] [backcolor=transparent]{
24. [backcolor=transparent]        [backcolor=transparent]System[backcolor=transparent].[backcolor=transparent]err[backcolor=transparent].[backcolor=transparent]println[backcolor=transparent]([backcolor=transparent]"An IOException was caught: "[backcolor=transparent] [backcolor=transparent]+[backcolor=transparent] ex[backcolor=transparent].[backcolor=transparent]getMessage[backcolor=transparent]());
25. [backcolor=transparent]        ex[backcolor=transparent].[backcolor=transparent]printStackTrace[backcolor=transparent]();
26. [backcolor=transparent]      [backcolor=transparent]}
27. [backcolor=transparent]      [backcolor=transparent]finally[backcolor=transparent] [backcolor=transparent]{
28. [backcolor=transparent]        [backcolor=transparent]try[backcolor=transparent] [backcolor=transparent]{
29. [backcolor=transparent]          [backcolor=transparent]// Close the input stream.
30. [backcolor=transparent]          input[backcolor=transparent].[backcolor=transparent]close[backcolor=transparent]();
31. [backcolor=transparent]        [backcolor=transparent]}
32. [backcolor=transparent]        [backcolor=transparent]catch[backcolor=transparent]([backcolor=transparent]IOException[backcolor=transparent] ex[backcolor=transparent])[backcolor=transparent] [backcolor=transparent]{
33. [backcolor=transparent]          [backcolor=transparent]System[backcolor=transparent].[backcolor=transparent]err[backcolor=transparent].[backcolor=transparent]println[backcolor=transparent]([backcolor=transparent]"An IOException was caught: "[backcolor=transparent] [backcolor=transparent]+[backcolor=transparent] ex[backcolor=transparent].[backcolor=transparent]getMessage[backcolor=transparent]());
34. [backcolor=transparent]          ex[backcolor=transparent].[backcolor=transparent]printStackTrace[backcolor=transparent]();
35. [backcolor=transparent]        [backcolor=transparent]}
36. [backcolor=transparent]      [backcolor=transparent]}
37. [backcolor=transparent]    [backcolor=transparent]}

1. 
   https://docs.oracle.com/javase/7/docs/api/java/io/EOFException.html
2. 
   https://examples.javacodegeeks.com/java-basics/exceptions/java-io-eofexception-how-to-solve-eofexception/