我在尝试使用bean将行插入数据库时遇到错误。编译和运行java代码时，create tables方法工作正常。任何意见，将不胜感激。
<%@page contentType="text/html" pageEncoding="UTF-8" %>
<%@ page import="java.util.*" %>
<%@ page import="assignment2.*"%>
<jsp:useBean id="homework2" class="assignment2.homework2" scope="session" />
<html>
<h2>Registration Page</h2>
<body>
<form method="post" action="register.jsp">
<fieldset>
<legend>Create your account</legend>
<div>
<label>Username: *</label>
<input type="text" name="username">
</div>
<div>
<label>First Name: *</label>
<input type="text" name="firstname">
</div>
<div>
<label>Last Name: *</label>
<input type="text" name="lastname">
</div>
<div>
<label>E-mail: *</label>
<input type="text" name="email">
</div>
</fieldset>
<br />
<fieldset>
<legend>Your Password</legend>
<div>
<label>Password: *</label>
<input type="password" name="password">
</div>
<div>
<input type="submit" name="submit" value="Submit">
</div>
</fieldset>
<br/>
<input type="button" value="Back to login" onclick="location.href='login.jsp'">
</form>
</body>
</html>
<%
String username = request.getParameter("username");
String firstname = request.getParameter("firstname");
String lastname = request.getParameter("lastname");
String email = request.getParameter("email");
String password = request.getParameter("password");
if(username == null && firstname == null && lastname == null && email == null && password == null){
} else if(username.equals("")){
out.print("please fill in username");
} else if(firstname.equals("")){
out.print("please fill in firstname");
} else if(lastname.equals("")){
out.print("please fill in lastname");
} else if(email.equals("")){
out.print("please fill in email");
} else if(password.equals("")){
out.print("please fill in password");
} else{
homework2.insertRecordIntoDbUserTable(username,password,firstname,lastname,email);
}
%>
这是java代码
package assignment2;
import java.sql.DriverManager;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;
public class homework2 {
private static final String DB_DRIVER = "oracle.jdbc.driver.OracleDriver";
private static final String DB_CONNECTION = "jdbc:oracle:thin:@localhost:1521:XE";
private static final String DB_USER = "scott";
private static final String DB_PASSWORD = "tiger";
public static void main(String[] args){
try{
createDbUserTable();
createDbCartTable();
createDbAddressTable();
createDbproductTable();
createDbOrderTable();
createDbOrder_detTable();
createDbpay_mthd();
insertRecordIntoDbUserTable("","","","","");
} catch (SQLException e){
System.out.println(e.getMessage());
}
}
private static void createDbUserTable() throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String sequence = "CREATE SEQUENCE customers_seq START WITH 1 INCREMENT BY 1 NOCACHE NOCYCLE";
String createTableSQL = "CREATE TABLE dbuser("
+ "USER_ID NUMBER(5) NOT NULL, "
+ "USERNAME VARCHAR(20) NOT NULL, "
+ "PASSWORD VARCHAR(20) NOT NULL, "
+ "FIRSTNAME VARCHAR(20) NOT NULL, "
+ "LASTNAME VARCHAR(20) NOT NULL, "
+ "EMAIL VARCHAR(20) NOT NULL, "
+ "PRIMARY KEY(USER_ID) "
+ ")";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(createTableSQL);
statement.execute(createTableSQL);
System.out.println(sequence);
statement.execute(sequence);
System.out.println("Table \"dbuser\" is created!");
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (statement != null) {
statement.close();
}
if (dbConnection != null) {
dbConnection.close();
}
}
}
public static void insertRecordIntoDbUserTable(String username, String password, String firstname,
String lastname,String email) throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String insertTableSQL = "INSERT INTO DBUSER"
+ "(USER_ID, USERNAME, PASSWORD, FIRSTNAME, LASTNAME, EMAIL) "
+ "VALUES"
+ "(CUSTOMERS_SEQ.NEXTVAL,?,?,?,?,?)";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(insertTableSQL);
statement.executeUpdate(insertTableSQL);
System.out.println("Record is inserted into DBUSER table");
} catch (SQLException e){
System.out.println(e.getMessage());
} finally {
if(statement != null) {
statement.close();
}
if(dbConnection != null){
dbConnection.close();
}
}
}
private static void createDbCartTable() throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String sequence = "CREATE SEQUENCE cart_seq START WITH 1 INCREMENT BY 1 NOCACHE NOCYCLE";
String createTableSQL = "CREATE TABLE DBCART("
+ "cart_id NUMBER(5) NOT NULL, "
+ "user_id NUMBER(5) NOT NULL, "
+ "anon_id NUMBER(5) NOT NULL, "
+ "item VARCHAR2(20) NOT NULL, "
+ "amount NUMBER(5) NOT NULL, "
+ "price DECIMAL(10,2) NOT NULL, "
+ "PRIMARY KEY(cart_id) "
+ ")";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(createTableSQL);
statement.execute(createTableSQL);
System.out.println(sequence);
statement.execute(sequence);
System.out.println("Table \"dbcart\" is created!");
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (statement != null) {
statement.close();
}
if (dbConnection != null) {
dbConnection.close();
}
}
}
public static void insertRecordIntoDbCartTable(int cart_id, int user_id, int anon_id, String item,int amount, double price) throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String insertTableSQL = "INSERT INTO DBCART"
+ "(cart_id, user_id, anon_id, item, amount, price) "
+ "VALUES"
+ "(cart_seq.NEXTVAL,?,?,?,?,?)";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(insertTableSQL);
statement.executeUpdate(insertTableSQL);
System.out.println("Record is inserted into DBCART table");
} catch (SQLException e){
System.out.println(e.getMessage());
} finally {
if(statement != null) {
statement.close();
}
if(dbConnection != null){
dbConnection.close();
}
}
}
private static void deleteRecordFromDbCartTable(int cart_id) throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String deleteTableSQL = "DELETE DBUSER WHERE cart_id = " + cart_id;
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(deleteTableSQL);
// execute delete SQL stetement
statement.execute(deleteTableSQL);
System.out.println("Record is deleted from DBcart table!");
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (statement != null) {
statement.close();
}
if (dbConnection != null) {
dbConnection.close();
}
}
}
private static void createDbAddressTable() throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String sequence = "CREATE SEQUENCE address_seq START WITH 1 INCREMENT BY 1 NOCACHE NOCYCLE";
String createTableSQL = "CREATE TABLE dbAddress("
+ "address_id NUMBER(5) NOT NULL, "
+ "user_id NUMBER(5) NOT NULL, "
+ "street VARCHAR2(20) NOT NULL, "
+ "city VARCHAR2(20) NOT NULL, "
+ "region VARCHAR2(20) NOT NULL, "
+ "country VARCHAR2(20) NOT NULL, "
+ "postal_code VARCHAR2(20) NOT NULL, "
+ "PRIMARY KEY(address_id) "
+ ")";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(createTableSQL);
statement.execute(createTableSQL);
System.out.println(sequence);
statement.execute(sequence);
System.out.println("Table \"dbaddress\" is created!");
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (statement != null) {
statement.close();
}
if (dbConnection != null) {
dbConnection.close();
}
}
}
public static void insertRecordIntoDbCartTable(int address, int user_id, String street, String city, String region, String country, String postal_code) throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String insertTableSQL = "INSERT INTO dbCart"
+ "(address_id, user_id, street, city, region, country, postal_code) "
+ "VALUES"
+ "(address_seq.NEXTVAL,?,?,?,?,?,?)";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(insertTableSQL);
statement.executeUpdate(insertTableSQL);
System.out.println("Record is inserted into DBaddress table");
} catch (SQLException e){
System.out.println(e.getMessage());
} finally {
if(statement != null) {
statement.close();
}
if(dbConnection != null){
dbConnection.close();
}
}
}
private static void createDbproductTable() throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String sequence = "CREATE SEQUENCE product_seq START WITH 1 INCREMENT BY 1 NOCACHE NOCYCLE";
String createTableSQL = "CREATE TABLE dbProduct("
+ "prod_id NUMBER(5) NOT NULL, "
+ "order_id NUMBER(5) NOT NULL, "
+ "item_name VARCHAR2(20) NOT NULL, "
+ "description VARCHAR2(20) NOT NULL, "
+ "price DECIMAL(8,2) NOT NULL, "
+ "qoh NUMBER(5) NOT NULL, "
+ "PRIMARY KEY(prod_id) "
+ ")";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(createTableSQL);
statement.execute(createTableSQL);
System.out.println(sequence);
statement.execute(sequence);
System.out.println("Table \"dbproduct\" is created!");
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (statement != null) {
statement.close();
}
if (dbConnection != null) {
dbConnection.close();
}
}
}
public static void insertRecordIntoDbProductTable(int prod_id, String item_name, String description, double price, int qoh) throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String insertTableSQL = "INSERT INTO dbProduct"
+ "(prod_id, item_name, description, price, qoh) "
+ "VALUES"
+ "(prod_seq.NEXTVAL,?,?,?,?)";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(insertTableSQL);
statement.executeUpdate(insertTableSQL);
System.out.println("Record is inserted into DBproduct table");
} catch (SQLException e){
System.out.println(e.getMessage());
} finally {
if(statement != null) {
statement.close();
}
if(dbConnection != null){
dbConnection.close();
}
}
}
private static void deleteRecordFromDbProductTable(int product_id) throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String deleteTableSQL = "DELETE dbProduct WHERE product_id = " + product_id;
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(deleteTableSQL);
// execute delete SQL stetement
statement.execute(deleteTableSQL);
System.out.println("Record is deleted from DBproduct table!");
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (statement != null) {
statement.close();
}
if (dbConnection != null) {
dbConnection.close();
}
}
}
private static void updateRecordIntoDbProductTable(int prod_id, String item_name, String description, double price, int qoh) throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String updateTableSQL = "UPDATE dbProduct"
+ " SET item_name = " + item_name+", "
+ "description= " + description + ", "
+ "price= " + price + ", "
+ "qoh= " + qoh + ", "
+ " WHERE prod_id = " + prod_id;
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(updateTableSQL);
// execute update SQL stetement
statement.execute(updateTableSQL);
System.out.println("Record is updated to DBUSER table!");
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (statement != null) {
statement.close();
}
if (dbConnection != null) {
dbConnection.close();
}
}
}
private static void createDbOrderTable() throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String sequence = "CREATE SEQUENCE order_seq START WITH 1 INCREMENT BY 1 NOCACHE NOCYCLE";
String createTableSQL = "CREATE TABLE dbOrder("
+ "order_id NUMBER(5) NOT NULL, "
+ "user_id NUMBER(5) NOT NULL, "
+ "prod_id NUMBER(5) NOT NULL, "
+ "amount VARCHAR2(20) NOT NULL, "
+ "price DECIMAL(8,2) NOT NULL, "
+ "total_price NUMBER(5) NOT NULL, "
+ "pay_mthd NUMBER(5) NOT NULL, "
+ "PRIMARY KEY(prod_id) "
+ ")";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(createTableSQL);
statement.execute(createTableSQL);
System.out.println(sequence);
statement.execute(sequence);
System.out.println("Table \"dborder\" is created!");
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (statement != null) {
statement.close();
}
if (dbConnection != null) {
dbConnection.close();
}
}
}
public static void insertRecordIntoDbOrderTable(int order_id, int user_id, double total_price, String pay_mthd) throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String insertTableSQL = "INSERT INTO dbOrder"
+ "(order_id, user_id, total_price) "
+ "VALUES"
+ "(order_seq.NEXTVAL,?,?)";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(insertTableSQL);
statement.executeUpdate(insertTableSQL);
System.out.println("Record is inserted into DBorder table");
} catch (SQLException e){
System.out.println(e.getMessage());
} finally {
if(statement != null) {
statement.close();
}
if(dbConnection != null){
dbConnection.close();
}
}
}
private static void createDbOrder_detTable() throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String sequence = "CREATE SEQUENCE order_det_seq START WITH 1 INCREMENT BY 1 NOCACHE NOCYCLE";
String createTableSQL = "CREATE TABLE dbOrder_det("
+ "order_det_id NUMBER(5) NOT NULL, "
+ "prod_id NUMBER(5) NOT NULL, "
+ "amount NUMBER(5) NOT NULL, "
+ "price DECIMAL(8,2) NOT NULL, "
+ "PRIMARY KEY(prod_id) "
+ ")";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(createTableSQL);
statement.execute(createTableSQL);
System.out.println(sequence);
statement.execute(sequence);
System.out.println("Table \"dborder_det\" is created!");
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (statement != null) {
statement.close();
}
if (dbConnection != null) {
dbConnection.close();
}
}
}
public static void insertRecordIntoDbOrder_detTable(int order_det_id, int prod_id, double amount, double price) throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String insertTableSQL = "INSERT INTO dbOrder_det"
+ "(order_det_id, prod_id, amount, price) "
+ "VALUES"
+ "(order_det_seq.NEXTVAL,?,?,?)";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(insertTableSQL);
statement.executeUpdate(insertTableSQL);
System.out.println("Record is inserted into DBorder_det table");
} catch (SQLException e){
System.out.println(e.getMessage());
} finally {
if(statement != null) {
statement.close();
}
if(dbConnection != null){
dbConnection.close();
}
}
}
private static void createDbpay_mthd() throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String sequence = "CREATE SEQUENCE pay_mthd_id_seq START WITH 1 INCREMENT BY 1 NOCACHE NOCYCLE";
String createTableSQL = "CREATE TABLE dbPay_mthd("
+ "pay_mthd_id NUMBER(5) NOT NULL, "
+ "user_id NUMBER(5) NOT NULL, "
+ "order_id NUMBER(5) NOT NULL, "
+ "cc_type VARHCAR2(20) NOT NULL, "
+ "cc_num NUMBER(5)(8,2) NOT NULL, "
+ "PRIMARY KEY(prod_id) "
+ ")";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(createTableSQL);
statement.execute(createTableSQL);
System.out.println(sequence);
statement.execute(sequence);
System.out.println("Table \"Dbpay_mthd\" is created!");
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (statement != null) {
statement.close();
}
if (dbConnection != null) {
dbConnection.close();
}
}
}
public static void insertRecordIntoDbpay_mthdTable(int pay_mthd_id, int user_id, int order_id, String cc_type, int cc_num) throws SQLException {
Connection dbConnection = null;
Statement statement = null;
String insertTableSQL = "INSERT INTO dbPay_mthd"
+ "(pay_mthd_id, user_id, order_id, cc_type, cc_num) "
+ "VALUES"
+ "(pay_mthd_id_seq.NEXTVAL,?,?,?,?)";
try {
dbConnection = getDBConnection();
statement = dbConnection.createStatement();
System.out.println(insertTableSQL);
statement.executeUpdate(insertTableSQL);
System.out.println("Record is inserted into DBpay_mthd table");
} catch (SQLException e){
System.out.println(e.getMessage());
} finally {
if(statement != null) {
statement.close();
}
if(dbConnection != null){
dbConnection.close();
}
}
}
private static Connection getDBConnection() {
Connection dbConnection = null;
try {
Class.forName(DB_DRIVER);
} catch (ClassNotFoundException e) {
System.out.println(e.getMessage());
}
try {
dbConnection = DriverManager.getConnection(
DB_CONNECTION, DB_USER,DB_PASSWORD);
return dbConnection;
} catch (SQLException e) {
System.out.println(e.getMessage());
}
return dbConnection;
}
}
这是我得到的错误：
HTTP Status 500 - java.lang.NoClassDefFoundError: assignment2/homework2 (wrong name: homework2)
type Exception report
message java.lang.NoClassDefFoundError: assignment2/homework2 (wrong name: homework2)
description The server encountered an internal error that prevented it from fulfilling this request.
exception
javax.servlet.ServletException: java.lang.NoClassDefFoundError: assignment2/homework2 (wrong name: homework2)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:349)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.NoClassDefFoundError: assignment2/homework2 (wrong name: homework2)
java.lang.ClassLoader.defineClass1(Native Method)
java.lang.ClassLoader.defineClass(Unknown Source)
java.security.SecureClassLoader.defineClass(Unknown Source)
org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2472)
org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:854)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1274)
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1157)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1292)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1178)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2428)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2434)
org.apache.jasper.compiler.Node$Root.accept(Node.java:464)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2376)
org.apache.jasper.compiler.Generator.generate(Generator.java:3594)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:250)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:356)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:336)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:323)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:585)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:363)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:396)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:340)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
再次感谢