我想在jsp中显示表格。
静态内容很好，但表格没有显示 我想在MVC中做，我不想在jsp中使用java代码
import java.sql.Connection;
import java.sql.DriverManager;
public class DbConnection {
Connection db_conn;
public Connection getConnection()
{
try {
Class.forName("org.postgresql.Driver").newInstance();
String url = "jdbc:postgresql://localhost:5432/testowaaplikacja";
String user = "postgres";
String pass = "password";
db_conn = DriverManager.getConnection(url,user,pass);
if((db_conn != null)&&(!db_conn.isClosed()))
{
System.out.println("Connected...");
}
return db_conn;
}
catch(Exception e)
{
//System.out.println("Error in connecting to database ");
e.printStackTrace();
}
return null;
}
}
public class KsiegaWieczysta {
private long nrksiegi;
private String adres;
private long nrdzialki;
public long getNrksiegi() {
return nrksiegi;
}
public void setNrksiegi(long nrksiegi) {
this.nrksiegi = nrksiegi;
}
public String getAdres() {
return adres;
}
public void setAdres(String adres) {
this.adres = adres;
}
public long getNrdzialki() {
return nrdzialki;
}
public void setNrdzialki(long nrdzialki) {
this.nrdzialki = nrdzialki;
}
}
public class KsiegiDAO {
private static DbConnection db1;
private static Connection connection;
public List<KsiegaWieczysta> getReleaseData() {
List<KsiegaWieczysta> ksiegi = new ArrayList<KsiegaWieczysta>();
ResultSet resultSet = null;
Statement statement = null;
try {
db1 = new DbConnection();
connection = db1.getConnection();
String query = "SELECT nrksiegi, address, nrdzialki FROM ksiegi";
statement = connection.createStatement();
resultSet = statement.executeQuery(query);
{
while (resultSet.next()) {
KsiegaWieczysta ksiega = new KsiegaWieczysta();
ksiega.setNrksiegi(resultSet.getLong("nrksiegi"));
ksiega.setAdres(resultSet.getString("address"));
ksiega.setNrdzialki(resultSet.getLong("nrdzialki"));
ksiegi.add(ksiega);
}
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (resultSet != null) {
try {
resultSet.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (statement != null) {
try {
statement.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
if (connection != null) {
try {
connection.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
return ksiegi;
}
}
@WebServlet("/showtable")
public class ShowTable extends HttpServlet {
KsiegiDAO ksiegiDAO = new KsiegiDAO();
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
List<KsiegaWieczysta> ksiegi = ksiegiDAO.getReleaseData();
request.setAttribute("ksiegi", ksiegi); // Will be available as
// ${ksiegi} in JSP
request.getRequestDispatcher("/WEB-INF/showtable.jsp").forward(request, response);
}
}
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
Hello
<table>
<c:forEach items="${ksiegi}" var="ksiega">
<tr>
<td><c:out value="${ksiega.nrksiegi}" /></td>
<td><c:out value="${ksiega.adres}" /></td>
<td><c:out value="${ksiega.nrdzialki}" /></td>
</tr>
</c:forEach>
</table>
</body>
</html>
感谢您的帮助