Servlet存储和检索数据库中的数据

Question

也许someona可以给出一个servlet存储和检索数据库中数据的例子吗？谢谢。

Answer 1

不是最好的代码，但它让你开始：

public class MyServletGetsDataFromDb extends HttpServlet { 
     public static final JDBC_URL = "whtever:my://database/is?connection=parameters"; 
     public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { 
     Connection conn = null; 
     try { 
      conn = DriverManager.getConnection(JDBC_URL); 
      ResultSet results = conn.createStatement("SELECT id from table").executeQuery(); 
      response.setContentType("text/plain"); 
      while (results.next()) { 
       response.getWriter().write(results.getString(1)+"\n"); 
      } 
     } catch (SQLException e) { 
      response.setStatusCode(500); 
      throw new ServletException(e.getMessage()); 
     } finally { 
      try { 
      if (conn != null) conn.close(); 
      } catch (SQLException e) { 
      response.setStatusCode(500); 
      throw new ServletException(e.getMessage()); 
      } 
     } 
     } 
    } 

出去，并增强它。希望有所帮助。