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當我運行一個簡單的程序(沒有數據庫)它運行正常,但是當我運行我的servlet編程與數據庫它doesn't.I想運行我的登錄頁面,其中註冊用戶的數據將存儲在mySQl數據庫。我在做這個程序在netbeans IDE 8.0.2中用mySQL數據庫。代碼如下:在我的servlet使用database.it編程沒有給出任何輸出,但沒有JDBC或數據庫它正在正確運行,我可以修復它嗎?
<!DOCTYPE html> <html>
<head><title>Registration form</title> <meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<form action="Register" method="get">
<p>Name:<input type="text" name="username"/></p><br/>
<p>Password:<input type="password" name="password"/></p><br/>
<p>EmailId:<input type="text" name="emailid"/></p><br/>
<select name="usercountry">
<option>India</option>
<option>pakistan</option>
<option>USA</option>
<option>australia</option>
<option>other</option>
</select><br/> <br/>
<input type="submit" name="login"/>
</form>
</body>
Register.java
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(name="Register",urlPatterns={"/Register"})
public class Register extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String n=request.getParameter("username");
String p=request.getParameter("password");
String e=request.getParameter("emailid");
String c=request.getParameter("usercountry");
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con=DriverManager.getConnection("jdbc:mysql://localhost:3306/registeruser","root","Mysql");
PreparedStatement ps=con.prepareStatement("insert into registeruser values(?,?,?,?)");
ps.setString(1, n);
ps.setString(2, p);
ps.setString(3, e);
ps.setString(4, c);
int i=ps.executeUpdate();
if(i>0)
out.print("you are successfully registered....");}
catch(Exception e2){
System.out.print(e2);
}
out.close();
}
}
通常您的應用程序服務器(Tomcat或類似的)會在服務器日誌中向您顯示更多信息。您是否已將數據庫的JDBC驅動程序添加到lib目錄中? –