Java删除properties配置文件中指定键值的代码

将开发过程较好的一些内容片段记录起来，下面的内容段是关于Java删除properties配置文件中指定键值的内容。
public static boolean deleteKeyValue4Pro(String delete_key, String delete_value) {
boolean flag = false;
String toreplace =delete_key + "=" + delete_value + "n";
try {
StringBuffer sb = new StringBuffer();
String templine;
File file = new File("ftpconfig.properties");
BufferedReader bin = new BufferedReader(new FileReader(file));
while ((templine = bin.readLine()) != null) {
templine = unicodeToString(templine);
sb.append(templine + "n");
}
String save = new String(sb.toString());
System.out.println("before delete:n" + save + "n--------------n");
System.out.println("delete:" + toreplace + "n--------------n");
Pattern pattern = Pattern.compile(toreplace, Pattern.MULTILINE);
Matcher matcher = pattern.matcher(save);
while (matcher.find()) {
save = matcher.replaceAll("");
}
BufferedWriter writer = new BufferedWriter(new FileWriter(file));
String[] saves = save.split("n");
for (int i = 0; i < saves.length; i++) {
String[] key_values = saves[i].split("=");
writer.write(stringToUnicode(key_values[0]) + "="
+ key_values[1] + "n");
}
System.out.println("after delete:n" + save);
writer.flush();
bin.close();
writer.close();
flag = true;
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return flag;
}