Я изучаю Java CRUD Operation. Я пытаюсь вставить, обновить и удалить записи из базы данных sql. Вставка и отображение всех методов записи работает, но проблема заключается в том, что, когда я нажимаю на ссылку "Редактировать и удалить ссылки", ее выброс http 404 не найден, исключение
Вот мой HTML-код, отображающий все записи.
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>All Posts</title>
</head>
<body>
<div style="width: 1200px; margin-left: auto; margin-right: auto;">
<table cellpadding="10">
<tr>
<th>Id</th>
<th>Title</th>
<th>Description</th>
<th>Detail</th>
<th>Category</th>
<th>Date</th>
<th>Image</th>
<th></th>
</tr>
<c:forEach items="${AllPost}" var="p">
<tr>
<td>${p.id}</td>
<td>${p.title}...</td>
<td>${p.description}...</td>
<td>${p.detail}...</td>
<td>${p.category}</td>
<td>${p.date}...</td>
<td>${p.image}...</td>
<td>
<a href="EditPost?id=${p.id}">Edit</a>
<a href="DeletePost?id=${p.id}">Delete</a>
</td>
</tr>
</c:forEach>
</table>
</div>
</body>
</html>
Вот HTML-код для EidtPost.jsp
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Edit</title>
</head>
<body>
<h1>Edit News</h1>
<div style="width: 900px; margin-left: auto; margin-right: auto">
<c:forEach items="${getNewsById}" var="p">
<form action="JSP/ManagerEditPost.jsp" method="post">
<input type="hidden" name="id" value="${p.id}">
Title:<br>
<input type="text" value="${p.title}" name="title" style="width: 200px"><br>
Description:<br>
<input type="text" value="${p.description}" name="description" style="width: 200px"><br>
Detail:<br>
<textarea name="detail" style="width: 400px; height: 200px">${p.detail}</textarea><br>
Category:
<select name="category">
<option value="${p.category}">${p.category}</option>
<option value="World">World</option>
<option value="Tech">Tech</option>
<option value="Sport">Sport</option>
</select><br>
Image:<br>
<input type="text" value="${p.image}" name="image" style="width: 200px"><br>
<input type="submit" value="Submit">
</form>
</c:forEach>
</div>
</body>
</html>
Вот код доступа к данным для операции CRUD.
public void edit(int id, String title, String description, String detail, String category, String image){
try {
String sql = "update News SET title = ?, description = ?, detail = ?, category = ?, image = ?" + " where id = ?";
PreparedStatement ps= DBUtils.getPreparedStatement(sql);
ps.setString(1, title);
ps.setString(2, description);
ps.setString(3, detail);
ps.setString(4, category);
ps.setString(5, image);
ps.setInt(6, id);
ps.executeUpdate();
} catch (ClassNotFoundException | SQLException ex) {
Logger.getLogger(DataAccess.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
Вот код сервлета.
@WebServlet(name = "EditPost", urlPatterns = {"/EditPost"})
public class EditPost extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
{
String idTemp = request.getParameter("id");
int id = Integer.parseInt(idTemp);
request.setAttribute("getNewsById", DataAccess.getNewById(id));
RequestDispatcher rd = request.getRequestDispatcher("CRUD/EditPost.jsp");
try {
rd.forward(request, response);
} catch (ServletException | IOException ex) {
Logger.getLogger(EditPost.class.getName()).log(Level.SEVERE, null, ex);
}
}
Вот код web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">
<context-param>
<param-name>javax.faces.PROJECT_STAGE</param-name>
<param-value>Development</param-value>
</context-param>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet>
<servlet-name>EditPost</servlet-name>
<servlet-class>servlet.EditPost</servlet-class>
</servlet>
<servlet>
<servlet-name>DeletePost</servlet-name>
<servlet-class>servlet.DeletePost</servlet-class>
</servlet>
<servlet>
<servlet-name>AllPost</servlet-name>
<servlet-class>servlet.AllPost</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Faces Servlet</servlet-name>
<url-pattern>/faces/*</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>EditPost</servlet-name>
<url-pattern>/EditPost</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>DeletePost</servlet-name>
<url-pattern>/DeletePost</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>AllPost</servlet-name>
<url-pattern>/AllPost</url-pattern>
</servlet-mapping>
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>faces/index.xhtml</welcome-file>
</welcome-file-list>
</web-app>
Вот снимок экрана с ошибкой, когда я нажимаю ссылку редактирования и удаления.
