关于分类添加和图书添加报错的问题
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.util.*"%>
<%
String basePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";
%>
<!DOCTYPE html>
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>图书添加</title>
</head>
<body>
<center>
<h1>图书添加</h1>
<form action="<%=basePath%>AddBookServlet" method="post">
<table width="400px" cellspacing="0px" cellpadding="0px" border="1px">
<tr>
<td>图书ID</td>
<td><input type="text" name="id" placeholder="请输入数字" pattern="\d+" required="required"></td>
</tr>
<tr>
<td>图书名</td>
<td><input type="text" name="bookName"></td>
</tr>
<tr>
<td>图书分类</td>
<td>
<select name="catgoryName">
<option value=""></option>
</select>
</td>
</tr>
<tr>
<td>价格</td>
<td><input type="text" name="price" placeholder="请输入价格" ></td>
</tr>
<tr>
<td>描述</td>
<td><input type="text" name="description" placeholder="请输入描述信息"></td>
</tr>
<tr>
<td colspan="2" style="text-align:center">
<input type="submit" value="添加">
<input type="reset" value="重置">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
package com.vincent.system;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class AddBookServlet
*/
@WebServlet("/AddBookServlet")
public class AddBookServlet extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
LibSeviceImpl lsi = new LibSeviceImpl();
String id =request.getParameter("id");
String bookName=request.getParameter("bookName");
String catgoryName=request.getParameter("catgoryName");
int price=Integer.parseInt(request.getParameter("price"));
String description = request.getParameter("description");
Book book = new Book(id,catgoryName,bookName,price,description);
lsi.addBook(book);
request.getRequestDispatcher("/addBook.jsp").forward(request, response);
//response.sendRedirect(request.getContextPath()+"/server.jsp");
}
}
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%
String basePath=request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+request.getContextPath()+"/";
%>
<%
String msg="";
if(request.getAttribute("msg")!=null){
msg=(String)request.getAttribute("msg");
}
%>
<!DOCTYPE html>
<html>
<head>
<base href="<%=basePath%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>图书分类添加</title>
</head>
<body>
<center>
<h1>图书分类添加</h1>
<form action="<%=basePath%>CatgoryServlet" method="post">
<h3><font color="red"><%=msg %></font></h3>
<table width="400px" cellspacing="0px" cellpadding="0px" border="1px">
<tr>
<td>分类ID</td>
<td><input type="text" name="id"></td>
</tr>
<tr>
<td>名 字</td>
<td><input type="text" name="catgoryName"></td>
</tr>
<tr>
<td>描 述</td>
<td><input type="text" name="description"></td>
</tr>
<tr>
<td colspan="2" style="text-align:center">
<input type="submit" value="添加">
<input type="reset" value="重置">
</td>
</tr>
</table>
</form>
</center>
</body>
</html>
package com.vincent.system;
import java.io.IOException;
import java.util.List;
import java.util.Map;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class CategoryServlet
*/
@WebServlet("/CategoryServlet")
public class CategoryServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public CategoryServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//接收来自category.jsp的数据
request.setCharacterEncoding("utf-8");
response.setCharacterEncoding("utf-8");
Long id = Long.valueOf(request.getParameter("id"));
String categoryName = request.getParameter("categoryName");
String description = request.getParameter("description");
LibDaoImpl ldi = new LibDaoImpl();
List<Map<String, Object>> catgoryList = ldi.getAllBookCatgory();
for(Map<String, Object> map:catgoryList) {
if(map.get("id").equals(id)||map.get("catgoryName").equals(categoryName)) {
request.setAttribute("msg","id或类名已存在,请重新输入!");
response.sendRedirect(request.getContextPath()+"/catgory.jsp");
return;
}
}
ldi.addBookCatgory(id,categoryName,description);
request.getRequestDispatcher("/server.jsp").forward(request,response);
}
}
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