Question

我在连接我的servlet时遇到一些问题，以便我可以将一些数据传递给mysql数据库。我在这里读了很多帖子，但对其他成员的建议没有运气。

我有一个名为＆＃34的插件页面; insertData.jsp＆＃34;在该页面上有一个表单，其中操作指向名为＆＃34; UpdateData＆＃34;的servlet。当我在网页上单击“提交”时，出现404错误，指出所请求的资源不可用。我还更新了我的web xml文件，试图指向正确的方向。

所以这是我的文件夹设置： UpdateData.java位于源包文件夹的控制器包中。该项目的名称是＆＃34; RukertContainerTracker＆＃34;。

这是我的jsp页面：

<%@taglib prefix="sql" uri="http://java.sun.com/jsp/jstl/sql"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.Statement"%>
<%@page import="java.sql.DriverManager"%>
<%@page import="java.sql.Connection"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Insert Data</title>
    </head>
    <body>
        <h1>Insert Data Into Container Records</h1>

        <H1>The Rukert Terminals Container Tracker </H1>

        <form name="Insert Record" action="/UpdateData" method="Post">

            Container Number: <input type="text" name="containerNumber"> <br /> 
            Full Out: <input type="date" name="fullOut" /> <br/>
            Empty In: <input type="date" name="emptyIn" /> <br/>
            Empty Out <input type="date" name="emptyOut" /> <br/>
            Full In: <input type="date" name="fullIn" /> <br/>
            Comments: <input type="text" name="comments" /> <br/>           
            <input type="submit" value="Submit" />        

        </form>


               <div>
            <a href="javascript:history.back();">
            <span class="categoryLabelText">HOME</span>
        </a>

        </div>


    </body>
</html>

我的servlet：

    package controller;

import java.io.IOException; 
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 

public class UpdateData extends HttpServlet {    
    protected void processRequest(HttpServletRequest request, HttpServletResponse     response) 
            throws ServletException, IOException, SQLException { 

       //Get container data from the JSP page 

        String container=request.getParameter("containerNumber"); 
        String fullOutDate=request.getParameter("fullOut"); 
        String emptyInDate=request.getParameter("emptyIn");
        String emptyOutDate=request.getParameter("emptyOut");
        String fullInDate=request.getParameter("fullIn");
        String comments=request.getParameter("comments");

        //Print the above got values in console 

        System.out.println("The username is" +container); 
        System.out.println("\nand the password is" +fullOutDate);

        String connectionparams="jdbc:mysql://localhost:3306/rukerttracker";
        String db="rukerttracker";

        String uname="root";
        String psword="Colorado1982";

        Connection connection=null;

        ResultSet rs; 
        try { 

          // Loading the available driver for a Database communication 

            Class.forName("com.mysql.jdbc.Driver"); 

//Creating a connection to the required database 

            connection = DriverManager.getConnection 
             (connectionparams, uname, psword); 

       //Add the data into the database 

            String sql = "insert into containerinventory values (?,?,?,?,?,?)";
            try (PreparedStatement prep = connection.prepareStatement(sql)) {
                prep.setString(1, container);
                prep.setString(2, fullOutDate);
                prep.setString(3, emptyInDate);
                prep.setString(4, emptyOutDate);
                prep.setString(5, fullInDate);
                prep.setString(6, comments);

                prep.executeUpdate();
            } 

           }catch(Exception E){

               System.out.println("The error is=="+E.getMessage()); 


           }


finally{
            connection.close();
        }


    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {

        String userPath = request.getServletPath();

        // if category page is requested
        if (userPath.equals("/insertData")) {
            // TODO: Implement category request


            // use RequestDispatcher to forward request internally
        String url = "/WEB-INF/view" + userPath + ".jsp";

        try {
            request.getRequestDispatcher(url).forward(request, response);
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
    }
}

最后是我的web.xml页面：

 <servlet>
        <servlet-name>ControllerServlet</servlet-name>
        <servlet-class>controller.ControllerServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>ControllerServlet</servlet-name>
        <url-pattern>/chooseLanguage</url-pattern>
        <url-pattern>/viewTracker</url-pattern>
        <url-pattern>/editTracker</url-pattern>
        <url-pattern>/addToCart</url-pattern>
        <url-pattern>/viewCompany</url-pattern>
        <url-pattern>/category</url-pattern>
        <url-pattern>/updateCart</url-pattern>
        <url-pattern>/purchase</url-pattern>
        <url-pattern>/viewCart</url-pattern>
        <url-pattern>/checkout</url-pattern>

    </servlet-mapping>
    <servlet>
        <servlet-name>UpdateData</servlet-name>
        <servlet-class>controller.UpdateData</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>UpdateData</servlet-name>
        <url-pattern>/insertData</url-pattern>
    </servlet-mapping>

我有两个servlet，我不知道这是否重要，但是我无法让应用程序在控制器servlet中工作，所以我创建了Update Data servlet。

任何关于我为什么不断收到这个404错误的帮助都会非常感激。感谢您抽出宝贵时间来研究这个问题。

Answer 1

我认为在表单中你使用的是POST方法，而你的servlet没有post方法。请检查一下。 protected void doPost（HttpServletRequest请求，HttpServletResponse响应）抛出ServletException，IOException {...} 不可用。

JSP表单未与Servlet 404连接 - 错误

1 个答案: