Html和Servlet HTTP状态404错误
问题描述：
美好的一天！拜托，我是新来的servlet和有很难理解为什么我不断收到此错误 HTTP状态404 - 找不到 类型状态报告 消息未找到 描述所请求的资源不可用。 的GlassFish Server开源版4.1Html和Servlet HTTP状态404错误
servlet代码：
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
package simpleRegistration;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
*
* @author chinwe
*/
public class SimpleRegistration extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
private PreparedStatement pstmt;
@Override
public void init() throws ServletException {
initializeJdbc();
}
/**
* Handles the HTTP <code>POST</code> method.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
*/
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
try (PrintWriter out = response.getWriter()) {
/* TODO output your page here. You may use following sample code. */
String lastName = request.getParameter("lastName");
String firstName = request.getParameter("firstName");
String mi = request.getParameter("mi");
String phone = request.getParameter("telephone");
String email = request.getParameter("email");
String address = request.getParameter("street");
String city = request.getParameter("city");
String state = request.getParameter("state");
String zip = request.getParameter("zip");
try {
if (lastName.length() == 0 || firstName.length() == 0) {
out.println("Last Name and First Name are required");
} else {
storeStudent(lastName, firstName, mi, phone, email,
address, city, state, zip);
}
} catch (Exception ex) {
out.println("Error: " + ex.getMessage());
} finally {
out.close();
}
}
}
private void initializeJdbc() {
//To change body of generated methods, choose Tools | Templates.
try {
Class.forName("com.mysql.jdbc.Driver");
System.out.println("Driver loaded");
Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/javabook", "root", "9682244umanA");
System.out.println("Database connected");
pstmt = conn.prepareStatement("insert into Address (lastName, firstName, mi, telephone, email, street, city,"
+ " state, zip) values (?, ?, ?, ?, ?, ?, ?, ?, ?)");
} catch (ClassNotFoundException | SQLException ex) {
ex.printStackTrace();
}
}
private void storeStudent(String lastName, String firstName, String mi, String phone, String email, String address, String city, String state, String zip) throws SQLException {
pstmt.setString(1, lastName);
pstmt.setString(2, firstName);
pstmt.setString(3, mi);
pstmt.setString(4, phone);
pstmt.setString(5, email);
pstmt.setString(6, address);
pstmt.setString(7, city);
pstmt.setString(8, state);
pstmt.setString(9, zip);
pstmt.executeUpdate();
}
}
的HTML代码是：
<!DOCTYPE html>
<!--
To change this license header, choose License Headers in Project Properties.
To change this template file, choose Tools | Templates
and open the template in the editor.
-->
<html>
<head>
<title>Simple Registration without Confirmation</title>
<meta charset="ISO-8859-1">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
Please register to your instructor's student address book.
<form method="post" action="SimpleRegistration">
<p>Last Name<font color = "#FF0000">*</font>
<input type="text" name="lastName">
First Name <font color ="#FF0000">*</font>
<input type="text" name="firstName">
MI <input type="text" name="mi" size="3">
</p>
<p>Telephone
<input type="text" name="telephone" size="20">
Email
<input type="text" name="email" size="28">
</p>
<p>Street <input type="text" name="street" size="50">
</p>
<p>City <input type="text" name="city" size="23">
Street
<select size="1" name="state">
<option value="GA">Georgia-GA</option>
<option value="OK">Oklahoma-OK</option>
<option value="IN">Indiana_IN</option>
</select>
Zip <input type="text" name="zip" size="9">
</p>
<p><input type="submit" name="Submit" value="Submit">
<input type="reset" value="Reset">
</p>
</form><p><font color="#FF0000"> required fields</font></p>
</body>
</html>
在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>SimpleRegsitration</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
答
我会建议你rem从您的帖子中提取您的用户名和密码。 404是未找到的状态码。我没有看到您尝试在您的代码中尝试点击的端点，但您收到的响应意味着无法在您要查找资源的位置找到该端点。
答
您还没有在web.xml中输入servlet。当web.xml中不存在任何条目时，服务器找不到该servlet。 入境将是这样的
<servlet>
<servlet-name>SimpleRegistration</servlet-name>
<servlet-class>simpleRegistration.SimpleRegistration</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>SimpleRegistration</servlet-name>
<url-pattern>/simpleregistration</url-pattern>
</servlet-mapping>