如何删除文本文件中的字符串，如果不匹配用户输入字符串？

Question

可以说：我有一个用户输入“placeofjo.blogspot.com”

我的代码从该网站提取链接并将链接放置在文本文件中。

现在的文本文件有这样的内容：

http://www.twitter.com/jozefinfin/ 
http://www.facebook.com/jozefinfin/ 
http://placeofjo.blogspot.com/2008_08_01_archive.html 
http://placeofjo.blogspot.com/2008_09_01_archive.html 
http://placeofjo.blogspot.com/2008_10_01_archive.html 
http://placeofjo.blogspot.com/2008_11_01_archive.html 
http://placeofjo.blogspot.com/2008_12_01_archive.html 
http://placeofjo.blogspot.com/2009_01_01_archive.html 
http://placeofjo.blogspot.com/2009_02_01_archive.html 
http://placeofjo.blogspot.com/2009_03_01_archive.html 
http://placeofjo.blogspot.com/2009_04_01_archive.html 
http://placeofjo.blogspot.com/2009_05_01_archive.html 
http://placeofjo.blogspot.com/2009_06_01_archive.html 
http://placeofjo.blogspot.com/2009_07_01_archive.html 
http://placeofjo.blogspot.com/2009_08_01_archive.html 
http://placeofjo.blogspot.com/2009_09_01_archive.html 
http://placeofjo.blogspot.com/2009_10_01_archive.html 
http://placeofjo.blogspot.com/2009_11_01_archive.html 
http://placeofjo.blogspot.com/2010_01_01_archive.html 
http://placeofjo.blogspot.com/2010_02_01_archive.html 
http://placeofjo.blogspot.com/2010_04_01_archive.html 
http://placeofjo.blogspot.com/2010_06_01_archive.html 
http://placeofjo.blogspot.com/2010_07_01_archive.html 
http://placeofjo.blogspot.com/2010_08_01_archive.html 
http://placeofjo.blogspot.com/2010_10_01_archive.html 
http://placeofjo.blogspot.com/2010_11_01_archive.html 
http://placeofjo.blogspot.com/2011_01_01_archive.html 
http://placeofjo.blogspot.com/2011_02_01_archive.html 
http://placeofjo.blogspot.com/2011_03_01_archive.html 
http://endlessdance.blogspot.com 
http://blogskins.com/me/aaaaaa 
http://weheartit.com 

我想删除

http://www.twitter.com/jozefinfin/ 
http://www.facebook.com/jozefinfin/ 
http://endlessdance.blogspot.com 
http://blogskins.com/me/aaaaaa 
http://weheartit.com 

且仅这仅仅是类似于用户的输入字符串离开它。 我该怎么做？

的文本文件所需的内容：

http://placeofjo.blogspot.com/2008_08_01_archive.html 
    http://placeofjo.blogspot.com/2008_09_01_archive.html 
    http://placeofjo.blogspot.com/2008_10_01_archive.html 
    "     " 
    "     " 

Answer 1

1. 通过
线
2. 检查线路是否含有用户输入
3. 如果是读取文件线，将其写入新文件

Answer 2

假设您可以同时在内存中保存整个链接列表，您可能可以从链接网站e ...

1. 阅读文件，拆分换行符，并生成链接列表。
2. 过滤列表，以消除任何不匹配的链接
3. 程序将最终过滤列表回文件，替换文件

的旧内容在过滤器的匹配，我想到的是使用

string.indexOf(inputToMatch) > 0 // it matches 

Answer 3

而不是建立一个文本文件，然后过滤它。在解析网页时执行过滤器。只需查找符合条件的链接，并只写入文件的良好链接即可。

Answer 4

这里是解决这个问题的正则表达式的方法。但是，你不应该使用大文件这种解决方案..

import java.io.File; 
import java.io.IOException; 
import java.util.regex.Pattern; 
import org.apache.commons.io.FileUtils; 

public class FileReplacer { 


    public static void main(String[] args) { 
     replaceFileContent(); 
    } 

    public static void replaceFileContent() { 
     try { 
      String allStr = FileUtils.readFileToString(new File("c:/temp/data.txt")); 
      Pattern pattern =Pattern.compile("^(?!http://placeofjo\\.blogspot\\.com/.*$).+$(\\r\\n)?", Pattern.MULTILINE); 
      String newAllStr = pattern.matcher(allStr).replaceAll(""); 
      FileUtils.writeStringToFile(new File("c:/temp/newdata.txt"), newAllStr); 

     } catch (IOException e) { 
      // TODO Auto-generated catch block 
      throw new RuntimeException(e); 
     } 
    } 
}