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我遇到了有關我的Java servlet和應用程序的問題。我拉着頭髮試圖瞭解如何使這些servlet在瀏覽器中正確工作並輸出。我在下面附上我的代碼,請指出我的方向以使此程序正常工作。我瞭解示例代碼與被告知要做什麼。我不想找你做我的工作,只需要視覺上的幫助。所有的幫助非常感謝。JSP未顯示結果
的Servlet
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class FormPost3 extends HttpServlet{
private static final long serialVersionUID = 1L;
Connection con = null;
public void Form3(){
init();
}
public void init(){
try{
Class.forName ("oracle.jdbc.driver.OracleDriver");
con = DriverManager.getConnection("jdbc:oracle:thin:@localhost:7070:XE", "student2", "pass");
Statement stmt = con.createStatement();
stmt.executeUpdate("CREATE TABLE MYTABLE (FNAME VARCHAR2(20),LNAME VARCHAR2(40), PHONE VARCHAR2(20))");
stmt.close();
}
catch (Exception e){
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException{
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html><body>");
out.println("<form action='" + request.getRequestURL() + "' method='post' >");
out.println("First Name:");
out.println("<input type='text' name='FNAME' />");
out.println("<br>");
out.println("Last Name:");
out.println("<input type='text' name='LNAME' />");
out.println("<br>");
out.println("Phone:");
out.println("<input type='text' name='PHONE' />");
out.println("<input type='submit' value='Submit' />");
out.println("</form>");
out.println("</body></html>");
out.close();
}
public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException{
try{
if (con != null)
init();
String fname = request.getParameter("FNAME");
String lname = request.getParameter("LNAME");
String phone = request.getParameter("PHONE");
Statement stmt = con.createStatement();
stmt.executeUpdate("INSERT INTO MYTABLE VALUES('" + fname + "', '" + lname + "', '" + phone + "')");
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html><body>");
ResultSet rset = stmt.executeQuery("SELECT * FROM MYTABLE");
while (rset.next()){
out.print("<pre>");
out.print("First Name: " + rset.getString(1));
out.print("</pre>");
out.println();
out.print("<pre>");
out.print("Last Name: " + rset.getString(2));
out.print("</pre>");
out.println();
out.print("<pre>");
out.print("Phone: " + rset.getString(3));
out.print("</pre><br>");
out.println();
out.println();
}
out.println("</body></html>");
out.close();
stmt.close();
}
catch (Exception e){
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html><body>");
out.println(e.getMessage());
out.println("</body></html>");
out.close();
}
}
}
的web.xml
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<session-config>
<session-timeout>
30
</session-timeout>
</session-config>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>FormPost3</servlet-name>
<servlet-class>FormPost3</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>FormPost3</servlet-name>
<url-pattern>/FormPost3</url-pattern>
</servlet-mapping>
</web-app>
的index.html
<html>
<head>
</head>
<body>
<h3 align="center">Storing Employee Details</h3>
<form action="/WFormPost3" method="post">
<div align="center">
Empno: <input type="text" size="20" name="empno"/>
<br><br>
Ename <input type="text" size="20" name="ename"/>
<br><br>
Salary <input type="text" size="20" name="sal"/>
<br><br>
<input type="submit" value="insert" />
<div>
</form>
</body>
</html>
當你點擊提交按鈕時你會得到什麼? –
你是說jsp沒有顯示結果。 jsp代碼在哪裏?確保你有任何異常堆棧,請將它添加到你的問題中。 –