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Java-HTTP错误404请求的资源不可用,Glassfish

作者：互联网

这个问题已经在这里有了答案：            >            Servlet returns “HTTP Status 404 The requested resource (/servlet) is not available”                                    7个
每当我按下“提交操作”按钮将信息发送到控制器时,我总是收到“ HTTP 404状态-找不到：所请求的资源不可用”,我只是想知道是否有什么可以帮助我解决这个令人沮丧的问题.这是我的代码：

LibraryInfo.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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>Library Information</title>
</head>
<body>
<form action="/bookServlet" method="POST">
    <fieldset style="width:300px">
    <legend>Find Book</legend>
        <table>
            <tr>
                <td>ISBN Number:</td>
                <td><input type="text" name="isbn" required="required"/></td>
            </tr>
        </table>
                <input type="submit" value="Find Book"/>
    </fieldset>
</form>
</body>
</html>

Book.java：

package com.farmani.model;

public class Book {
    private int isbn;
    private String author; 
    private String title; 
    private String status;
    public int getIsbn() {
        return isbn;
    }
    public void setIsbn(int isbn) {
        this.isbn = isbn;
    }
    public String getAuthor() {
        return author;
    }
    public void setAuthor(String author) {
        this.author = author;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getStatus() {
        return status;
    }
    public void setStatus(String status) {
        this.status = status;
    } 

}

ConnectionClass.java

package com.farmani.dao;

import java.sql.Connection;
import java.sql.SQLException;

import javax.naming.InitialContext;
import javax.naming.NamingException;
import javax.sql.DataSource;

public class ConnectionClass {
    private DataSource dataSource; 
    public ConnectionClass(){
        try{
            InitialContext context = new InitialContext(); 
            dataSource = (DataSource)context.lookup("jdbc/employee"); 
        }catch(NamingException ex){
            ex.printStackTrace(); 
        }
    }
    public Connection getConnection(){
        Connection conn = null; 
        try{
            conn=dataSource.getConnection(); 
        }catch(SQLException ex){
            ex.printStackTrace(); 
        }
        return conn; 
    }
}

LibraryDAO.java

package com.farmani.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.farmani.model.Book;

public class LibraryDAO {
    private Connection connection; 
    public LibraryDAO(){
        ConnectionClass conn = new ConnectionClass(); 
        connection = conn.getConnection(); 
    }
    public Book getBookByISBN(int isbn){
        Book bk = new Book(); 
        try{
            PreparedStatement preparedStatement = connection.prepareStatement("select * from book where ISBN=?");
            preparedStatement.setInt(1,isbn);
            ResultSet rs = preparedStatement.executeQuery(); 
            if(rs.next()){
                bk.setIsbn(rs.getInt("ISBN"));
                bk.setAuthor(rs.getString("author"));
                bk.setTitle(rs.getString("title")); 
                bk.setStatus(rs.getString("status")); 
            }
        }catch(SQLException e){
            e.printStackTrace();
        }
        return bk;
    }

}

bookServlet.java：

package com.farmani.controllers;

import java.io.IOException;

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

import com.farmani.dao.LibraryDAO;
import com.farmani.model.Book;


@WebServlet("/bookServlet")
public class bookServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private static String BOOK_DETAILS="/LibraryDetails"; 
    private LibraryDAO dao; 


    public bookServlet() {
        super();
        dao = new LibraryDAO(); 
    }


    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        int isbn = Integer.parseInt(request.getParameter("isbn")); 
        Book bk = dao.getBookByISBN(isbn); 
        request.setAttribute("Book",bk); 
        RequestDispatcher view = request.getRequestDispatcher(BOOK_DETAILS); 
        view.forward(request,response); 
    }

}

Web.xml：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
  <display-name>LibraryWeb</display-name>
  <welcome-file-list>
    <welcome-file>LibraryInfo.jsp</welcome-file>
  </welcome-file-list>
</web-app>

LibraryDetails.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!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>Book Details</title>
</head>
<body>
<CENTER><h1><b>Book Details</b></h1></CENTER>
<ul>
<li>ISBN: ${Book.isbn}</li>
<li>Author: ${Book.author}</li>
<li>Title: ${Book.title }</li>
<li>Status: ${Book.status}</li> 
</ul> 
</body>
</html>

解决方法:

在formServlet的bookServlet之前给一个句点.像下面.

    action =“ ./ bookServlet”

标签：glassfish,java
来源： https://codeday.me/bug/20191120/2045444.html