我正在学习使用 java 和 netbeans 与数据库对话。 我有一个名为金枪鱼的数据库，其中包含一些信息。我想使用 netbeans 打印 html 表。我以为我已经设置好了一切，但是当我尝试打印表格时什么也没有出现。不确定我丢失了什么或者我是否位于错误的文件中...
来自 TunaServlet 的代码
package ViewLayer;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import businesslayer.TunasBusinessLogic;
import transferobjects.Tuna;
import java.util.List;
/**
*
* @author Samuel
*/
public class TunaServlet extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
try (PrintWriter out = response.getWriter()) {
/* TODO output your page here. You may use following sample code. */
out.println("<!DOCTYPE html>");
out.println("<html>");
out.println("<head>");
out.println("<title>Sam Murdock</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Sam Murdock</h1>");
out.println("date:" + java.time.LocalDate.now().toString());
out.println("<br>");
out.println("time:"+java.time.LocalTime.now().toString());
out.println("<br>");
TunasBusinessLogic logic = new TunasBusinessLogic();
List<Tuna>tunas=logic.getAllTunas();
out.println("<table>");
out.println("<tr>");
out.println("<td>Tuna Id</td>");
out.println("<td>Genus Name</td> ");
out.println("<td>Species Name</td>");
out.println("<td>Common Name</td>");
out.println("<td>Max Weight</td>");
out.println("<td>IUCN Status</td>");
out.println("</tr>");
for(Tuna tuna: tunas){
out.printf("<tr><td>%d</td><td>%s</td><td>%s</td><td>%s</td><td>%f</td><td>%s</td></tr>",
tuna.getTunaId(), tuna.getGenusName(),tuna.getSpeciesName(), tuna.getCommonName(), tuna.getMaxWeight(), tuna.getIucnStatus());
out.println("</table>");
}out.println("</body>");
out.println("</html>");
}
}
// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/**
* Handles the HTTP <code>GET</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
如果我丢失了某个文件，您需要查看请告诉我，我也会复制它。它打印我的名字以及时间和日期没有问题，但不会打印表格的任何内容。
最佳答案
您正在关闭 for 循环内的表格，请将其移至 for 循环外
....
List<Tuna>tunas=logic.getAllTunas();
out.println("<table>");
out.println("<tr>");
out.println("<td>Tuna Id</td>");
out.println("<td>Genus Name</td> ");
out.println("<td>Species Name</td>");
out.println("<td>Common Name</td>");
out.println("<td>Max Weight</td>");
out.println("<td>IUCN Status</td>");
out.println("</tr>");
for(Tuna tuna: tunas){
out.printf("<tr><td>%d</td><td>%s</td><td>%s</td><td>%s</td><td>%f</td><td>%s</td></tr>",tuna.getTunaId(), tuna.getGenusName(),tuna.getSpeciesName(), tuna.getCommonName(), tuna.getMaxWeight(), tuna.getIucnStatus());
}
//* move table closing tag out of for loop
out.println("</table>");
out.println("</body>");
out.println("</html>");
}
关于java - 尝试在 Netbeans 中打印 html 表，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36655629/