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/*[簡易ソフト開発]　ソースHTML置換Javaソース*/
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import java.io.*;

class CodeToHTML{
	public static void main(String args[]){
		String str = FileToString.fileToString(args[0]);
		if(!(str.equals("error"))){
		
			System.out.println("置換前の内容");
			System.out.println(str);
	
			str = str.replaceAll("&","&");
			str = str.replaceAll("<","&lt;");
			str = str.replaceAll(">","&gt;");
			str = str.replaceAll("\"","&quot;");

			System.out.println("\n置換後の内容");
			System.out.println(str);
			System.out.println("\n置換してよろしいですか？(y / n)");

			String ans;
			BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
			try{
				ans = br.readLine();
				if(ans.equals("y")){
					FileWriter fw = new FileWriter(new File(args[0]));
					fw.write(str);
					fw.close();
					System.out.println("置換完了しました！");
				}
				else{
					System.out.println("置換中止しました！");
				}
			}
			catch(IOException e){
				System.out.println(e);
			}
		}
	}
}

class FileToString{
	static String fileToString(String file_name){

		StringBuffer sb = new StringBuffer();

		try{
			FileReader fr = new FileReader(new File(file_name));
			int ch;
			while((ch = fr.read()) != -1){
				sb.append((char)ch);
			}
			fr.close();			
		}
		catch(FileNotFoundException e){
			System.out.println(e);
			return "error";
		}
		catch(IOException e){
			System.out.println(e);
			return "error";
		}

		return sb.toString();
	}
}
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