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Scanner遇上UnmappableCharacterException

时间:2014-07-22 00:02:03      阅读:434      评论:0      收藏:0      [点我收藏+]
上周末的时候,朋友约好去KTV,鉴于我这种不怎么听歌的孩子伤不起啊,灵机一动就把我的酷狗歌单导出来了,XML文件嘛,内容太多,我只想要歌名足已。于是写了一个java去输出歌名。
    岂料我受到了挫伤,scanner.hasNextLine()一直为false,于是我百思不得姐啊,经过调试发现,Scanner内部有java.nio.charset.UnmappableCharacterException,就百度了一下,没找到答案,google访问不了,想起公司的网络是香港的,就远程上去,还好在stackoverflow上找到了答案。O(∩_∩)O~~
  原来用改动下面一行就OK啦,不解释,你懂的,不懂就去stackoverflow。
    Scanner scanner=new Scanner(new File(filePath),"UTF-8");
URL:http://stackoverflow.com/questions/19252321/findwithinhorizon-fails-to-match (这个页面上你可以学到更多) bubuko.com,布布扣

Java Code:        
  1. public void output(String filePath) throws FileNotFoundException{
  2. Scanner scanner=new Scanner(new File(filePath));
  3. String str=null;
  4. while(scanner.hasNextLine()){
  5. str=scanner.nextLine();
  6. if(str.indexOf("FileName")>0){
  7. System.out.println(str.substring(str.indexOf(">")+1, str.lastIndexOf("<")));
  8. }
  9. }
  10. scanner.close();
  11. }
File content:
  1. <File>
  2. <MediaFileType>0</MediaFileType>
  3. <FileName>周杰伦 - 爱在西元前.mp3</FileName>
  4. <FilePath>D:\music\</FilePath>
  5. <FileSize>5623610</FileSize>
  6. <Duration>234292</Duration>
  7. <Hash>0589341ba15528a4c63e36c49a3c0e45</Hash>
  8. <Lyric>E:\KuGou\Lyric\周杰伦 - 爱在西元前-0589341ba15528a4c63e36c49a3c0e45.krc</Lyric>
  9. <Bitrate>192004</Bitrate>
  10. <MandatoryBitrate>0</MandatoryBitrate>
  11. </File>
Java Code after modify:
  1. public void output(String filePath) throws FileNotFoundException{
  2. Scanner scanner=new Scanner(new File(filePath),"UTF-8");//Always explicitly pass a charset when working with text
  3. String str=null;
  4. while(scanner.hasNextLine()){
  5. str=scanner.nextLine();
  6. if(str.indexOf("FileName")>0)
  7. System.out.println(str.substring(str.indexOf(">")+1, str.lastIndexOf("<")));
  8. }
  9. //It‘s better to check IOException when working with Scanner(PS:find UnmappableCharacterException took me more time,finally by debug to found )
  10. IOException ioException = scanner.ioException();
  11. if (ioException != null) {
  12. ioException.printStackTrace();
  13. }
  14. scanner.close();
  15. }

Scanner遇上UnmappableCharacterException,布布扣,bubuko.com

Scanner遇上UnmappableCharacterException

原文:http://blog.csdn.net/alec_king/article/details/38026111

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