我有一个Servlet需要帮助添加一个教师到我的迷你项目
但Servlet是空白的
这是Servlet：
@WebServlet(urlPatterns = {"/AddInstructorServlet"})
public class AddInstructorServlet extends HttpServlet {
/**
* Processes requests for both HTTP <code>GET</code> and <code>POST</code>
* methods.
*
* @param request servlet request
* @param response servlet response
* @throws ServletException if a servlet-specific error occurs
* @throws IOException if an I/O error occurs
* @throws SQLException
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException, SQLException {
response.setContentType("text/html;charset=UTF-8");
try (PrintWriter out = response.getWriter()) {
/* TODO output your page here. You may use following sample code. */
int iD = Integer.parseInt(request.getParameter("iD"));
String firstName = request.getParameter("firstName");
String lastName = request.getParameter("lastName");
String street = request.getParameter("street");
String city = request.getParameter("city");
String state = request.getParameter("state");
double zip = Double.parseDouble(request.getParameter("zip"));
String office = request.getParameter("office");
String eMail = request.getParameter("eMail");
System.out.println(iD);
Instructor i1 = new Instructor();
i1.insertDB(iD, firstName, lastName, street, city, state, zip, office, eMail);
int cn=i1.getID();
System.out.println(cn);
String fn=i1.getFirstName();
System.out.println(fn);
String ln=i1.getLastName();
System.out.println(ln);
String str=i1.getStreet();
System.out.println(str);
String ci=i1.getCity();
System.out.println(ci);
String st=i1.getState();
System.out.println(st);
zip=i1.getZip();
System.out.println(zip);
String off=i1.getOffice();
System.out.println(off);
String em=i1.getEMail();
System.out.println(em);
RequestDispatcher rd;
HttpSession ses1=request.getSession();
ses1.setAttribute("i1", i1);
rd= request.getRequestDispatcher("/Success.jsp");
rd.forward(request,response);
}
}
/**
* Handles the HTTP <code>GET</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 doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
try {
processRequest(request, response);
} catch (SQLException ex) {
Logger.getLogger(AddInstructorServlet.class.getName()).log(Level.SEVERE, null, ex);
}
}
/**
* 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 {
try {
processRequest(request, response);
} catch (SQLException ex) {
Logger.getLogger(AddInstructorServlet.class.getName()).log(Level.SEVERE, null, ex);
}
}
/**
* Returns a short description of the servlet.
*
* @return a String containing servlet description
*/
@Override
public String getServletInfo() {
return "Short description";
}// </editor-fold>
}
这是实际添加教师的JSP：
<%@page import="Business.Instructor"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<style>
h1 {
font-family:cursive;
}
body {
background-color: #3399CC;
}
</style>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Instructor</title>
</head>
<body>
<h1>Adding Instructor</h1>
<form method="post" action="http://localhost:8084/StudentApp/AddInstructorServlet">
<%
HttpSession ses1=request.getSession();
Instructor i1= (Instructor)ses1.getAttribute("i1");
%>
<p><input type="text" name="iD" value="" placeholder="ID"></p>
<p><input type="text" name="fn" value="" placeholder="First Name"></p>
<p><input type="text" name="ln" value="" placeholder="Last Name"></p>
<p><input type="text" name="str" value="" placeholder="Street"></p>
<p><input type="text" name="ci" value="" placeholder="City"></p>
<p><input type="text" name="st" value="" placeholder="State"></p>
<p><input type="text" name="zi" value="" placeholder="Zip"></p>
<p><input type="text" name="off" value="" placeholder="Office"></p>
<p><input type="text" name="em" value="" placeholder="Email"></p>
<p class="submit"><input type="submit" name="commit" value="Go"></p>
</form>
</body>
</html>
这是业务对象
package Business;
import java.io.Serializable;
import java.sql.*;
public class Instructor implements Serializable {
private int iD;
private String firstName;
private String lastName;
private String street;
private String city;
private String state;
private double zip;
private String office;
private String eMail;
private String message;
/**
* No arg constructor that sets the default value of all
* customer properties to an empty string value.
*/
public Instructor() {
this.iD = 0;
this.firstName = "";
this.lastName = "";
this.street = "";
this.city = "";
this.state = "";
this.zip = 0;
this.office = "";
this.eMail = "";
}
public void setID(int iD) {
this.iD = iD;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public void SetLastName(String lastName) {
this.lastName = lastName;
}
public void setStreet(String street) {
this.street = street;
}
public void setCity(String city) {
this.city = city;
}
public void setState(String state) {
this.state = state;
}
public void setZip(double zip) {
this.zip = zip;
}
public void setOffice(String office) {
this.office = office;
}
public void setEMail (String email) {
this.eMail = email;
}
public int getID() {
return iD;
}
public String getFirstName() {
return firstName;
}
public String getLastName() {
return lastName;
}
public String getStreet() {
return street;
}
public String getCity() {
return city;
}
public String getState() {
return state;
}
public double getZip() {
return zip;
}
public String getOffice() {
return office;
}
public String getEMail() {
return eMail;
}
public String getMessage() {
return this.message;
}
/**
* Establishes connection with the database containing the STUDENT information
* @return Connection
*/
public Connection instructorConnect() {
try {
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
} catch (ClassNotFoundException e) {
System.out.println("Errors: " + e);
}
Connection connect = null;
try {
connect = DriverManager.getConnection("jdbc:odbc:RegisDB");
} catch (SQLException e) {
System.out.println("You have Errors: " + e);
}
return connect;
}
/**
* Takes the student Id and retrieves the information from the customers
* data table and stores it in the properties of the customer object.
* @param iD
* @throws SQLException
*/
public void findDB(int iD) {
Connection con = instructorConnect();
Statement statement = null;
ResultSet result = null;
String sql = "Select * From Instructors Where iD = " + iD + ";";
try {
statement = con.createStatement();
result = statement.executeQuery(sql);
while (result.next()) {
this.iD = result.getInt("iD");
this.firstName = result.getString("firstName");
this.lastName = result.getString("lastName");
this.street = result.getString("street");
this.city = result.getString("city");
this.state = result.getString("state");
this.zip = result.getDouble("zip");
this.state = result.getString("office");
this.eMail = result.getString("eMail");
}
con.close();
} catch (SQLException e) {
System.out.println("Errors: " + e);
}
}
/**
* Takes in the parameters of the customer database and inserts the parameters taken into
* the database for the addition of customers to the database.
* @param iD
* @param firstName
* @param lastName
* @param street
* @param city
* @param state
* @param zip
* @param office
* @param email
* @throws SQLException
*/
public void insertDB(int iD, String firstName, String lastName, String street, String city, String state, double zip, String office, String email) throws SQLException {
Connection con = instructorConnect();
Statement statement;
ResultSet result;
int resultVal;
String sql = "INSERT INTO Students (iD, firstName, lastName, street, city, state, zip, office, eMail) VALUES ('" + firstName + "','" + lastName + "','" + street + "','" + city +"','" + state +"','" + zip + "','" + office + "','" + eMail + "');";
try {
statement = con.createStatement();
resultVal = statement.executeUpdate(sql);
System.out.println(resultVal);
} catch (SQLException e) {
System.out.println("Error: " + e);
System.out.println(e.getStackTrace());
} finally {
con.close();
}
}
/**
* Takes in student id and locates the customer in the database, performs
* an sql update and deletes the customer from the database.
* @param iD
* @throws SQLException
*/
public void deleteDB(int iD) throws SQLException {
Connection con = instructorConnect();
Statement statement;
int resultVal;
String sql = "DELETE FROM Students WHERE iD = " + iD + "';";
try {
statement = con.createStatement();
resultVal = statement.executeUpdate(sql);
System.out.println(resultVal);
} catch (SQLException e) {
System.out.println("Errors: " + e);
} finally {
con.close();
}
}
}
http://puu.sh/cSIhA/fd87e788f4.png （学校的假数据库哈哈） 这是视觉效果的实际数据库。
我只需要使用jsp和Servlet添加一个新的教师。
