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我想從文本文件中刪除一個字符串。我已經看到我需要一個臨時文件來做到這一點。我想從list.txt文件讀取並刪除一個字符串。我希望搜索的文件已經被創建和填充,我已經看到其他文章,並試圖將其修改爲我自己的個人項目。目前,我有:從文本文件中刪除字符串Android - 文件IO
package com.nullwall.listmanager;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
public class IPR3Activity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
DoWork("TestString");
}
public void DoWork(String deleteFromFile)
{
try{
String delete = deleteFromFile;
String line;
//locates a new file named list.txt
File root = new File(Environment.getExternalStorageDirectory(),"projects");
File file = new File(root, "list.txt");
//creates buffers
BufferedReader bufferedReader = new BufferedReader(new FileReader(file.getAbsolutePath()));
StringBuffer stringBuffer = new StringBuffer();
//Loads list.txt into bufferedReader, deletes line and moves on
while ((line = bufferedReader.readLine()) != null)
{
if (line.equals(deleteFromFile))
{
line.replace(deleteFromFile, "");
stringBuffer.append("\n");
}
else
{
stringBuffer.append(line);
stringBuffer.append("\n");
}
}
//Entire file has now been loaded into memory
//creates new Filewriter, append to false, rewrites list.txt with stringBuffer minus string
FileWriter writer = new FileWriter(file, false);
writer.write(stringBuffer.toString());
System.out.println("file written");
//closes writer
writer.flush();
writer.close();
}
catch (FileNotFoundException ex) {
ex.printStackTrace();
}
catch (IOException ex) {
ex.printStackTrace();
}
}
}
我與隨機字符串LIST.TXT這樣的:
notstring
notstring
notstring
teststring
notstring
notstring
運行後,沒有任何反應。我很喜歡這樣做File IO,所以請不要忽略我可能錯過的簡單事情。謝謝!
編輯我的文章與您的建議...仍然沒有被編輯。我是否正確編寫代碼?我在思考過程中添加了評論。 – PeterL 2012-02-06 18:23:18