Servlet簡單例子：輸出當前日期

 # JJU_干干

 

方法：

• 用到兩個時間包：

  import java.time.LocalDate;

  import java.time.format.DateTimeFormatter;

• 調用LocalDate類的now方法獲取當前時間：

  LocalDate.now()

• 調用DataTimeFormatter定義日期格式：

  DateTimeFormatter.ofPattern("yyyy-MM-dd")

• 調用LocalData.now()的format()輸出時間：

  LocalDate.now().format()

 

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代碼：

package case_01;

import java.io.IOException;
import java.io.PrintWriter;
import java.time.LocalDate;
import java.time.format.DateTimeFormatter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Servlet implementation class TimeNow
 */
@WebServlet("/TimeNow")
public class TimeNow extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public TimeNow() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        // 以下兩條語句防止輸入中文出現亂碼
        request.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset = utf-8");
        response.getWriter().append("Served at: ").append(request.getContextPath());
        PrintWriter out = response.getWriter();
        
        // 獲取當前日期
        LocalDate date = LocalDate.now();
        // 定義日期格式： yyy-MM-dd：年-月-日
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd"); 
        //輸出當前日期
        out.print(" 今天是："+date.format(formatter));
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

 

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運行結果：