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엑셀다운로드 파일명 한글깨짐

response.setHeader("Content-Disposition", "attachment;filename="+new String(fileName.getBytes("euc-kr"),"8859_1")+".xlsx");
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android LinearLayout java단에서 만들기

---- SampleLayoutCodeActivity.java package com.example.administrator.myapplication_view; import android.app.Activity; import android.os.Bundle; import android.support.v7.app.AppCompatActivity; import android.widget.Button; import android.widget.LinearLayout; public class SampleLayoutCodeActivity extends Activity {     @Override    protected void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         LinearLayout mainLayout = new LinearLayout(this);         mainLayout.setOrientation(LinearLayout.VERTICAL);  // new 연산자로 LinearLayout을 만들고 방향 설정         Button button01 = new Button(this); // Button 생성        button01.setText("Button 01");         LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT); // n...
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Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference

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Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference 이전페이지로 돌아가 구현중 에러 발생 layout 및 activity를 기존거 복사해와서 작업하다보니 위에 체크한 부분의 이름을 새로운 layout으로 바꾸는걸 깜박했다.
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Error:Error: 'N' is not a valid file-based resource name character: File-based resource names must contain only lowercase a-z, 0-9, or underscore

Error:Error: 'N' is not a valid file-based resource name character: File-based resource names must contain only lowercase a-z, 0-9, or underscore ayout xml 파일명에 대문자 N을 사용했음 layout xml 파일명만 소문자, 숫자, _만 사용가능 등
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android studio 단축키

http://seohyun99.tistory.com/2
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oracle ora 01476, nullif

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error :  SELECT 10/0 FROM dual SELECT 10/ NULLIF(0,0) FROM dual
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jstl function fmt

숫자 : <fmt:formatNumber value="12345.678" type="number"/><br/> 통화 : <fmt:formatNumber value="12345.678" type="currency" currencySymbol="$"/><br/> 백분율 : <fmt:formatNumber value="12345.678" type="percent"/><br/> 소수이하 : <fmt:formatNumber value="12345.678" pattern="#,##0.0"/><br/> JSTL tag ex)  : https://ahnsk39.blogspot.com/2017/08/jstljsp-standard-tag-library.html
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