title: how to write a value into application.properties in spring boot
body: <p>I already saw <a href="https://stackoverflow.com/questions/31334977/write-update-properties-file-value-in-spring">Write/Update properties file value in spring</a></p>
  
  <p>In Spring boot</p>
  
  <p>How to write a value into application.properties in spring boot?</p>
  
  <p>application.properties:<br>
  ews.batch_type=<br>
  ews.batch_dat=<br>
  ...other fields</p>
  
  <p>I want:</p>
  
  <p>application.properties:<br>
  ews.batch_type=<strong>ALL</strong><br>
  ews.batch_dat=<strong>20170222</strong><br>
  ...other fields </p>
  
  <p>Thanks</p>