Servlet未執行
[英]Servlet is not executing
問題描述
我有一個程序可以將新員工信息寫入文本文件。 我有一個項目，在該項目中，我必須將所述程序改編成一個程序，該程序將信息輸入到Oracle數據庫中。 我放入信息並單擊“提交”按鈕，然后什么也沒有發生，甚至沒有錯誤消息或引發的異常。 我不知道哪里出了問題，甚至不知道從哪里開始尋找東西，我可以承認我在這里有些頭疼。 我可以肯定地認為問題出在servlet上。 這是我的代碼：
form.jsp：
<%@page session="false" import="java.util.Iterator"%>
<%-- Retrieve the Status bean from the Request scope --%>
<jsp:useBean id="status" scope="request" class="util.Status"/>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Project 1</title>
</head>
<body>
<h1>Employee Hiring Form</h1>
<%-- Display any errors from previous form submission. --%>
<c:if test="${!status.isSuccessful}">
<font color="red">There were problems processing your request:
<ul>
<c:forEach var="ex" items="${status.exceptions}">
<li>
<c:out value="${ex.message}"></c:out>
</li>
</c:forEach>
</ul>
</font>
</c:if>
<%-- Display the form to enter a new hire. --%>
<form action="C:\Users\Nelle\Documents\NetBeansProjects\EmployeeDB\src\java\web\HiringServlet" method="POST">
<label for="department"><strong>Department</strong></label><br />
<select name="department">
<%String department = request.getParameter("department"); if (department == null) {department = "";}%>
<option value="unknown" <%if(department.equals("unknown")){out.print(" selected");}%>>Select a department...</s:option>
<option value="Human Resources" <%if(department.equals("Human Resources")){out.print(" selected");}%>>Human Resources</s:option>
<option value="Software Development" <%if(department.equals("Software Development")){out.print(" selected");}%>>Software Development</s:option>
<option value="Media Relations" <%if(department.equals("Media Relations")){out.print(" selected");}%>>Media Relations</s:option>
</select><br /><br />
<%String name = request.getParameter("name");if (name==null) name="";%>
<label for="name"><strong>Employee Name</strong></label><br />
<input type="text" name="name" value="<%=name%>" /><br /><br />
<%String jobTitle = request.getParameter("jobTitle");if (jobTitle == null) jobTitle = "";%>
<label for="jobTitle"><strong>Job Title</strong></label><br />
<input type="text" name="jobTitle" value="<%=jobTitle%>" /><br /><br />
<%String yearHired = request.getParameter("yearHired");if (yearHired == null) yearHired = "";%>
<label for="yearHired"><strong>Year Hired</strong></label><br />
<input type="text" name="yearHired" value="<%=yearHired%>" /><br /><br />
<%String gender = request.getParameter("gender");if (gender == null) gender = "";%>
<label for="gender"><strong>Gender</strong></label><br />
<input type="text" name="gender" value="<%=gender%>" /><br /><br />
<input type="submit" value="Add Employee" /> <input type="reset" value="Reset" />
</form>
</body>
</html>
Confirmation.jsp：
<jsp:useBean id="department" scope="request" class="domain.Department"/>
<jsp:useBean id="employee" scope="request" class="domain.Employee"/>
<jsp:useBean id="hiringList" scope="request" class="java.util.ArrayList"/>
<%@page contentType="text/html" pageEncoding="UTF-8" session="false" %>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Project 1</title>
</head>
<body>
<h1>New Hire Successfully Added</h1>
<p>
<strong>Employee Information</strong><br /><br />
Name: <jsp:getProperty name="employee" property="name"/><br />
Job Title: <jsp:getProperty name="employee" property="jobTitle"/><br />
Year Hired: <jsp:getProperty name="employee" property="yearHired"/><br />
Gender: <jsp:getProperty name="employee" property="gender"/><br /><br />
Added to department: <jsp:getProperty name="department" property="name"/><br />
</p>
<form action="form.jsp" method="POST" style="margin-bottom:25px;">
<input type="submit" value="Add Another Employee" name="more" />
</form>
<hr />
<h2>Complete Employee List</h2>
<table>
<tr><td>Name</td><td>Job Title</td><td>Year Hired</td><td>Gender</td> <td>Department</td><td>Department Description</td></tr>
<c:forEach var="hire" items="${hiringList}">
<tr>
<td style="border:1px solid #ccc;padding:0 15px 0 5px;"><c:out value="${hire.getEmployee().getName()}"></c:out></td>
<td style="border:1px solid #ccc;padding:0 15px 0 5px;"><c:out value="${hire.getEmployee().getJobTitle()}"></c:out></td>
<td style="border:1px solid #ccc;padding:0 15px 0 5px;"><c:out value="${hire.getEmployee().getYearHired()}"></c:out></td>
<td style="border:1px solid #ccc;padding:0 15px 0 5px;"><c:out value="${hire.getEmployee().getGender()}"></c:out></td>
<td style="border:1px solid #ccc;padding:0 15px 0 5px;"><c:out value="${hire.getDepartment().getName()}"></c:out></td>
<td style="border:1px solid #ccc;padding:0 15px 0 5px;"><c:out value="${hire.getDepartment().getDescription()}"></c:out></td>
</tr>
</c:forEach>
</table>
</body>
</html>
HiringServlet.java：
(imports removed)
public class HiringServlet extends HttpServlet {
public Statement statement;
protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException, SQLException, ClassNotFoundException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
//Declare the dispatcher for the View
RequestDispatcher view = null;
//Create the business logic object
HiringService hs = null;
//Create the Status object and store it in the request
//for use by the 'Registration Form' View (if necessary)
Status status = new Status();
request.setAttribute("status", status);
//Retrieve the HTML form parameters
String departmentName = request.getParameter("department");
String name = request.getParameter("name");
String jobTitle = request.getParameter("jobTitle");
String yearHired = request.getParameter("yearHired");
String gender = request.getParameter("gender");
// Verify form fields data; create Exception objects if data are missing
if (departmentName.equals("unknown"))
status.addException(new Exception("Please select a department. "));
if ((name == null) || (name.length() == 0))
status.addException(new Exception("Please enter the employee name. "));
if ((jobTitle == null) || (jobTitle.length() == 0))
status.addException(new Exception("Please enter the job title. "));
if ((yearHired == null) || (yearHired.length() == 0))
status.addException(new Exception("Please enter the year hired. "));
if ((gender == null) || (gender.length() == 0))
status.addException(new Exception("Please enter the gender. "));
// In case of errors, forward the request back to 'Registration Form'
// View and return without proceeding with the rest of the business logic.
if(!status.isSuccessful()){
view = request.getRequestDispatcher("form.jsp");
view.forward(request, response);
return;
}
//If no verification errors are found, the Controller
//uses the business services to perform the registration.
try {
// Load the JDBC driver
Class.forName("oracle.jdbc.driver.OracleDriver");
System.out.println("Driver loaded");
// Establish a connection
Connection connection = DriverManager.getConnection ("jdbc:oracle:thin:@nova.umuc.edu:1521:acad", "username", "password");
System.out.println("Database connected");
// Create a statement
statement = connection.createStatement();
hs = new HiringService();
// Retrieve the department object and verify that it exists.
Department department = hs.getDepartment(departmentName);
if (department == null) throw new Exception("The department you have "+
" selected does not yet exist; please select another one.");
//Create and populate the employee object
Employee employee = hs.createEmployee(
name, jobTitle, yearHired, gender);
//Delegate hiring to the HiringService object.
Hiring newHire = new Hiring(employee, department);
hs.hire(newHire);
ArrayList hiringList = hs.getHirings();
request.setAttribute( "department", department);
request.setAttribute( "employee", employee);
request.setAttribute( "hiringList", hiringList);
// Select the next View for the user in case hiring is
// successful Forward to the confirmation.jsp View
view = request.getRequestDispatcher("/confirmation.jsp");
view.forward(request,response);
}
catch (Exception ex){
status.addException(ex);
//Select next View.
//Exceptions are caught, forward back to the form.jsp View.
view = request.getRequestDispatcher("/form.jsp");
view.forward(request,response);
}
finally {
out.close();
}
}
}
如果您需要查看其他任何.java文檔，請告訴我，我將其發布，但我認為這不是問題。
2 個解決方案
解決方案1
0 2013-12-02 00:32:31
我將從這里開始
<form action="C:\Users\Nelle\Documents\NetBeansProjects\EmployeeDB\src\java\web\HiringServlet" method="POST">
您是否有關於HiringServlet被調用的線索？
解決方案2
0 2013-12-02 06:42:32
在 RAD 上執行 servlet 時，由 servlet 創建的未捕獲初始化異常
[英]Uncaught initialization exception created by servlet, when executing a servlet on RAD
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