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我试图插入学院名称到数据库使用bean下面的MVC模式，但每当我点击插入按钮我得到404 error。下面是代码JSP-无法使用JSP Beans插入记录
JSP文件
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Practical 5</title>
</head>
<body>
<h1>Insert College</h1>
<form action="NewServlet">
Enter Name<input type="text" name="collegeName"><br>
Enter City<input type="text" name="collegeCity"><br>
Enter Year<input type="number" name="collegeYear"><br>
Enter Fees<input type="number" name="collegeFees"><br>
<input type="submit" name="Insert" value="Insert">
</form>
<%
String msg=(String)request.getAttribute("msg");
%>
<h2><%=msg%></h2>
</body>
</html>
CollegeBean.java
package college;
public class CollegeBean {
public String cname;
public String ccity;
public int year;
public float fees;
public String getCname() {
return cname;
}
public void setCname(String cname) {
this.cname = cname;
}
public String getCcity() {
return ccity;
}
public void setCcity(String ccity) {
this.ccity = ccity;
}
public int getYear() {
return year;
}
public void setYear(int year) {
this.year = year;
}
public float getFees() {
return fees;
}
public void setFees(float fees) {
this.fees = fees;
}
}
CollegeDB.java
package college;
import java.sql.*;
public class CollegeDB {
public String insertOperation(CollegeBean collegeBeanObj) throws ClassNotFoundException,SQLException
{
Class.forName("com.mysql.jdbc.Driver");
Connection cn= DriverManager.getConnection("jdbc:mysql://localhost/jspractical5", "root", "");
Statement st= cn.createStatement();
int flag= st.executeUpdate("INSERT INTO college (c_name, c_city, c_year, c_fees) VALUES('"+collegeBeanObj.getCname()+"','"+collegeBeanObj.getCcity()+"','"+collegeBeanObj.getYear()+"','"+collegeBeanObj.getFees()+"')");
if (flag!=0)
return "Record Inserted";
else
return "Record not inserted";
}
}
最后控制文件中的servlet来处理所有的东西
NewServlet.java
package college;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import javax.servlet.RequestDispatcher;
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 = "NewServlet", urlPatterns = {"/college/NewServlet"})
public class NewServlet extends HttpServlet {
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
try {
String name=request.getParameter("name");
String city=request.getParameter("city");
int year=Integer.parseInt(request.getParameter("year"));
float fees=Integer.parseInt(request.getParameter("fees"));
CollegeBean collegeBeanObj= new CollegeBean();
collegeBeanObj.setCname(name);
collegeBeanObj.setCcity(city);
collegeBeanObj.setYear(year);
collegeBeanObj.setFees(fees);
CollegeDB cd= new CollegeDB();
String msg= cd.insertOperation(collegeBeanObj);
request.setAttribute("msg", msg);
RequestDispatcher rd= getServletContext().getRequestDispatcher("/index.jsp");
rd.forward(request, response);
}
catch(Exception e)
{
out.println(e);
}
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
@Override
public String getServletInfo() {
return "Short description";
}
}
如果你是一个初学者相同的URL模式，所以尽量更好Spring MVC框架。实施HttpServlets是极端老派并容易失败。 – dit
你的sevlet-config.xml和web.xml在哪里？更新你的问题。 –