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zugewiesen wurde Ich habe Tabelleninformationen von MySQL durch Erstellen pogoclass.jsp und Servlet abgerufen und es mit JSTL in JSP gedruckt. Mein Problem ist, dass ich nicht in der Lage bin, jede Zeileninformation abzurufen, wenn ich auf die Übergabeschaltfläche klicke, die jeder Zeile zugewiesen ist, und sie an ein anderes JSP sende, um die Zeile zu aktualisieren. Ich benutze EclipseIDE. Hier ist mein Code:Wie Informationen eines Datensatzes abgerufen werden, wenn wir auf die Übermittlungsschaltfläche klicken, die jeder Zeile mit JSP und Servlets
index.jsp:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<form action="ViewTableDelete" method="post">
<table>
<tr>
<td><input type="submit" value="tablevalues" /></td>
</tr>
</table>
</form>
</body>
</html>
pojoclassdemo3.java:
package com.example.pojo;
public class PojoClassDemo3 {
private String empname;
private String password;
public PojoClassDemo3()
{
}
public String getEmpname() {
return empname;
}
public void setEmpname(String empname) {
this.empname = empname;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
@Override
public String toString() {
return "PojoClassDemo3 [empname=" + empname + ", password=" + password + "]";
}
}
viewTableDelete.java:
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.example.pojo.PojoClassDemo3;
/**
* Servlet implementation class ViewTableDelete
*/
@WebServlet("/ViewTableDelete")
public class ViewTableDelete extends HttpServlet {
Connection con;
Statement st;
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public ViewTableDelete() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see Servlet#init(ServletConfig)
*/
public void init(ServletConfig config) throws ServletException {
// TODO Auto-generated method stub
System.out.println("********** In Init method **************");
try {
Class.forName("com.mysql.jdbc.Driver");
System.out.println("registered");
con = DriverManager.getConnection("jdbc:mysql://localhost:3306/emp1", "root", "root");
System.out.println("connection established");
st = con.createStatement();
System.out.println("statement created");
} catch (Exception ex) {
ex.printStackTrace();
}
}
/**
* @see Servlet#destroy()
*/
public void destroy() {
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#service(HttpServletRequest request, HttpServletResponse response)
*/
protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
// TODO Auto-generated method stub
try{
PrintWriter out=response.getWriter();
response.setContentType("text/html");
ResultSet rs=st.executeQuery("select * from emp1.employee");
System.out.println("select * from emp1.employee");
System.out.println("creating list");
List<PojoClassDemo3> list = new ArrayList<PojoClassDemo3>();
while(rs.next())
{
PojoClassDemo3 pojoclassdemo=new PojoClassDemo3();
pojoclassdemo.setEmpname(rs.getString("empname"));
pojoclassdemo.setPassword(rs.getString("password"));
list.add(pojoclassdemo);
}
request.setAttribute("list",list);
RequestDispatcher rd= request.getRequestDispatcher("tableprint3.jsp");
rd.forward(request, response);
}
catch(Exception ex)
{
ex.printStackTrace();
}
}
}
tableprint3.jsp:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@page import="java.util.List"%>
<%@page import="java.util.Map"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body >
<form method="post" action="update.jsp">
<table border="1" cellspacing="0" cellpadding="5">
<tr>
<th>empname</th>
<th>password</th>
<th>edit</th>
</tr>
<c:forEach items="${requestScope.list}" var="record">
<tr>
<td><input type="text" value="${record.empname}" /></td>
<td><input type="text" value="${record.password}" /></td>
<td><input type="submit" name="${record.empname}" onclick="Change(name)" value="update" /></td>
</c:forEach>
</table>
</form>
</body>
</html>
Bitte sagen uns, was ist die Ausgabe, die Sie bekommen? –