我在连接servlet时遇到了一个小问题，因此我可以将一些数据传递到mysql数据库。我在这里读了很多帖子，但在向其他成员提出建议时运气不佳。
我有一个名为"insertData.jsp"的jsp页面。在该页面上，有一个表单，其中的操作指向名为"UpdateData"的servlet。当我在网页上点击提交时，我会收到一个404错误，说明请求的资源不可用。我还更新了我的web xml文件，试图指向正确的方向。
下面是我的文件夹设置：UpdateData.java位于源软件包文件夹的控制器软件包中。该项目的名称是"RukertContainerTracker"。
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，但我无法让应用程序在控制器servlet中工作，所以我创建了更新数据servlet。
任何关于我为什么不断出现这个404错误的帮助都将不胜感激。谢谢你花时间看这个。
我认为在表单中您使用的是POST方法，而servlet没有POST方法。请检查一下。protected void doPost（HttpServlet请求，HttpServlet响应）throws Servlet异常，IOException｛…｝不可用。