java往properties文件中写配置信息

上一节我们学习了读取properties文件中的信息这一节我们来往配置文件中写信息

 

程序代码如下

  
  System.out.println("进来了");
  
  String address = request.getParameter("address");
  String port = request.getParameter("port");
  String username = request.getParameter("username");
  String pass = request.getParameter("pass");
  String dbname = request.getParameter("dbname");
  
  String url = "jdbc:mysql://"+address+":"+port+"/"+dbname;
  
  String path = request.getRealPath("");
//  数据库配置文件路径，这里要千万注意不要写相对路径，刚开始我就写的是src对应的路径，后来经过多次尝试终于找到原因了，必须写web-inf 下classes文件下的路径这样就是物理路径就正确了
  String conPath1 = path+"\\WEB-INF\\classes\\com\\rhcy\\config\\db.properties";
  String dbUrl = path+"\\WEB-INF\\classes\\com\\rhcy\\config\\lwz.sql";
 

  File file = new File(conPath1);
  try {

//创建文件
   file.createNewFile();
  } catch (IOException e) {
   
   e.printStackTrace();
  }
  
  Properties properties = new Properties();

  
    try {
   InputStream fis = new FileInputStream(conPath1);
   try {
    properties.load(fis);
   } catch (IOException e) {
    
    e.printStackTrace();
   }
   OutputStream fos = new FileOutputStream(conPath1);
   
   
   properties.setProperty("driver","com.mysql.jdbc.Driver");  
   properties.setProperty("url",url);  
   properties.setProperty("username",username);  
   properties.setProperty("password",pass);  
   
   
   try {
    properties.store(fos,null);
   } catch (IOException e) {
    
    e.printStackTrace();
   }
   
   
  } catch (FileNotFoundException e) {
   
   e.printStackTrace();
  }