jsp+servlet+javabean实现图片上传功能,存放地址在数据库中
时间: 2024-04-23 11:24:05 浏览: 49
可以参考以下步骤实现jsp+servlet+javabean实现图片上传功能,存放地址在数据库中:
1. 创建一个jsp页面用于上传图片,页面中包含一个上传表单和一个提交按钮。
2. 在表单中添加一个file类型的input标签,用于选择要上传的图片。
3. 在表单中添加一个用于提交表单的button标签。
4. 在jsp页面中添加一个用于显示上传结果的div标签。
5. 创建一个javabean用于处理图片上传和保存图片路径到数据库的操作。
6. 在javabean中添加一个方法用于获取上传图片的文件名和路径,并将其保存到指定的路径中。
7. 在javabean中添加一个方法用于将上传成功的图片路径保存到数据库中。
8. 创建一个servlet用于处理表单提交,并调用javabean中的方法实现图片上传和保存图片路径到数据库的操作。
9. 在servlet中获取上传的图片文件和上传路径,将图片保存到指定的路径中。
10. 在servlet中调用javabean中的方法将上传成功的图片路径保存到数据库中。
11. 在servlet中将上传结果返回到jsp页面中,通过div标签显示上传结果。
12. 完成以上步骤后,即可实现jsp+servlet+javabean实现图片上传功能,存放地址在数据库中。
相关问题
设计实现一个图书管理系统。图书信息存放到一个数据库中。图书包含信息:图书号、图书名、作者、价格、备注字段,使用jsp+servlet+javabean+jdbc+dao的web架构设计该系统
好的,我可以提供一个简单的图书管理系统的设计和实现思路,供您参考。
1. 数据库设计
首先,我们需要设计一个数据库来存储图书信息。可以创建一个名为“book”的表格,包含以下字段:
- book_id (int,主键,自增)
- book_name (varchar(50))
- author (varchar(50))
- price (double)
- remark (varchar(100))
2. JavaBean设计
我们可以创建一个名为“Book”的JavaBean来表示图书信息,包含以下属性:
```java
public class Book {
private int id;
private String name;
private String author;
private double price;
private String remark;
// getter和setter方法
}
```
3. DAO设计
我们可以创建一个名为“BookDAO”的类来进行数据库操作,包含以下方法:
```java
public class BookDAO {
// 获取所有图书信息
public List<Book> getAllBooks() throws SQLException;
// 根据图书ID获取图书信息
public Book getBookById(int id) throws SQLException;
// 添加一本新书
public void addBook(Book book) throws SQLException;
// 更新一本图书信息
public void updateBook(Book book) throws SQLException;
// 删除一本图书
public void deleteBook(int id) throws SQLException;
}
```
4. Servlet设计
我们可以创建一个名为“BookServlet”的Servlet来处理HTTP请求,包含以下方法:
```java
public class BookServlet extends HttpServlet {
private BookDAO bookDAO;
public void init() {
// 在初始化时创建BookDAO对象
bookDAO = new BookDAO();
}
// 处理GET请求
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String action = request.getParameter("action");
// 根据不同的action值执行不同的操作
if (action.equals("list")) {
// 获取所有图书信息并显示到页面
List<Book> books = bookDAO.getAllBooks();
request.setAttribute("books", books);
request.getRequestDispatcher("/bookList.jsp").forward(request, response);
} else if (action.equals("add")) {
// 跳转到添加图书页面
request.getRequestDispatcher("/addBook.jsp").forward(request, response);
} else if (action.equals("edit")) {
// 获取要编辑的图书信息并跳转到编辑页面
int id = Integer.parseInt(request.getParameter("id"));
Book book = bookDAO.getBookById(id);
request.setAttribute("book", book);
request.getRequestDispatcher("/editBook.jsp").forward(request, response);
} else if (action.equals("delete")) {
// 删除指定的图书信息,并返回图书列表页面
int id = Integer.parseInt(request.getParameter("id"));
bookDAO.deleteBook(id);
response.sendRedirect(request.getContextPath() + "/BookServlet?action=list");
}
}
// 处理POST请求
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String action = request.getParameter("action");
// 根据不同的action值执行不同的操作
if (action.equals("add")) {
// 添加新书并返回图书列表页面
Book book = new Book();
book.setName(request.getParameter("name"));
book.setAuthor(request.getParameter("author"));
book.setPrice(Double.parseDouble(request.getParameter("price")));
book.setRemark(request.getParameter("remark"));
bookDAO.addBook(book);
response.sendRedirect(request.getContextPath() + "/BookServlet?action=list");
} else if (action.equals("edit")) {
// 更新图书信息并返回图书列表页面
Book book = new Book();
book.setId(Integer.parseInt(request.getParameter("id")));
book.setName(request.getParameter("name"));
book.setAuthor(request.getParameter("author"));
book.setPrice(Double.parseDouble(request.getParameter("price")));
book.setRemark(request.getParameter("remark"));
bookDAO.updateBook(book);
response.sendRedirect(request.getContextPath() + "/BookServlet?action=list");
}
}
}
```
5. JSP页面设计
最后,我们可以创建以下页面来实现图书管理系统的UI:
- bookList.jsp:用于显示所有图书信息
- addBook.jsp:用于添加新图书信息
- editBook.jsp:用于编辑图书信息
这些页面都需要使用JSTL标签库来动态生成HTML内容,并使用EL表达式来显示JavaBean中的属性。
以上是一个简单的图书管理系统的设计和实现思路,仅供参考。如果您需要更具体的帮助,可以提出具体的问题。
JavaBean+Servlet+JSP+DAO(2)设计实现一个图书管理系统。图书信息存放到一个数据库中,图书包含信息:图书号、图书名、作者、价格。请实现对图书的增删改查操作。
好的,我会尽力回答您的问题。
首先,我们需要创建一个数据库来存储图书信息。可以使用MySQL或其他关系型数据库来实现。在数据库中,我们需要创建一个表来存储图书信息,表的字段包括图书号、图书名、作者、价格。
接下来,我们可以使用JavaBean来表示图书信息。我们可以创建一个Book类,它包含图书号、图书名、作者和价格这四个属性,并为每个属性提供getter和setter方法。例如:
```
public class Book {
private String bookId;
private String bookName;
private String author;
private double price;
public String getBookId() {
return bookId;
}
public void setBookId(String bookId) {
this.bookId = bookId;
}
public String getBookName() {
return bookName;
}
public void setBookName(String bookName) {
this.bookName = bookName;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
}
```
接下来,我们可以使用DAO模式来实现对图书信息的增删改查操作。我们可以创建一个BookDAO接口,定义以下方法:
```
public interface BookDAO {
public List<Book> getAllBooks() throws SQLException;
public Book getBookById(String bookId) throws SQLException;
public void addBook(Book book) throws SQLException;
public void updateBook(Book book) throws SQLException;
public void deleteBook(String bookId) throws SQLException;
}
```
然后,我们可以创建一个BookDAOImpl类来实现BookDAO接口中的方法。例如:
```
public class BookDAOImpl implements BookDAO {
private Connection conn;
public BookDAOImpl(Connection conn) {
this.conn = conn;
}
public List<Book> getAllBooks() throws SQLException {
List<Book> books = new ArrayList<Book>();
String sql = "select * from books";
PreparedStatement ps = conn.prepareStatement(sql);
ResultSet rs = ps.executeQuery();
while (rs.next()) {
Book book = new Book();
book.setBookId(rs.getString("book_id"));
book.setBookName(rs.getString("book_name"));
book.setAuthor(rs.getString("author"));
book.setPrice(rs.getDouble("price"));
books.add(book);
}
return books;
}
public Book getBookById(String bookId) throws SQLException {
String sql = "select * from books where book_id=?";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, bookId);
ResultSet rs = ps.executeQuery();
if (rs.next()) {
Book book = new Book();
book.setBookId(rs.getString("book_id"));
book.setBookName(rs.getString("book_name"));
book.setAuthor(rs.getString("author"));
book.setPrice(rs.getDouble("price"));
return book;
} else {
return null;
}
}
public void addBook(Book book) throws SQLException {
String sql = "insert into books(book_id, book_name, author, price) values (?, ?, ?, ?)";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, book.getBookId());
ps.setString(2, book.getBookName());
ps.setString(3, book.getAuthor());
ps.setDouble(4, book.getPrice());
ps.executeUpdate();
}
public void updateBook(Book book) throws SQLException {
String sql = "update books set book_name=?, author=?, price=? where book_id=?";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, book.getBookName());
ps.setString(2, book.getAuthor());
ps.setDouble(3, book.getPrice());
ps.setString(4, book.getBookId());
ps.executeUpdate();
}
public void deleteBook(String bookId) throws SQLException {
String sql = "delete from books where book_id=?";
PreparedStatement ps = conn.prepareStatement(sql);
ps.setString(1, bookId);
ps.executeUpdate();
}
}
```
最后,我们可以使用Servlet和JSP来实现用户界面。例如,我们可以创建一个BookServlet类,它处理所有的HTTP请求,并调用DAO中的方法来处理业务逻辑。例如:
```
public class BookServlet extends HttpServlet {
private BookDAO bookDAO;
public void init() throws ServletException {
Connection conn = getConnection(); // 获取数据库连接
bookDAO = new BookDAOImpl(conn); // 创建DAO对象
}
private Connection getConnection() throws ServletException {
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver");
String url = "jdbc:mysql://localhost:3306/bookdb";
String username = "root";
String password = "root";
conn = DriverManager.getConnection(url, username, password);
} catch (ClassNotFoundException e) {
throw new ServletException(e);
} catch (SQLException e) {
throw new ServletException(e);
}
return conn;
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String action = request.getParameter("action");
if (action == null) {
action = "list";
}
switch (action) {
case "list":
listBooks(request, response);
break;
case "show":
showBook(request, response);
break;
case "add":
addBook(request, response);
break;
case "edit":
editBook(request, response);
break;
case "update":
updateBook(request, response);
break;
case "delete":
deleteBook(request, response);
break;
default:
listBooks(request, response);
}
}
private void listBooks(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
try {
List<Book> books = bookDAO.getAllBooks();
request.setAttribute("books", books);
RequestDispatcher dispatcher = request.getRequestDispatcher("/book_list.jsp");
dispatcher.forward(request, response);
} catch (SQLException e) {
throw new ServletException(e);
}
}
private void showBook(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String bookId = request.getParameter("bookId");
try {
Book book = bookDAO.getBookById(bookId);
request.setAttribute("book", book);
RequestDispatcher dispatcher = request.getRequestDispatcher("/book_show.jsp");
dispatcher.forward(request, response);
} catch (SQLException e) {
throw new ServletException(e);
}
}
private void addBook(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String bookId = request.getParameter("bookId");
String bookName = request.getParameter("bookName");
String author = request.getParameter("author");
double price = Double.parseDouble(request.getParameter("price"));
Book book = new Book();
book.setBookId(bookId);
book.setBookName(bookName);
book.setAuthor(author);
book.setPrice(price);
try {
bookDAO.addBook(book);
response.sendRedirect("BookServlet");
} catch (SQLException e) {
throw new ServletException(e);
}
}
private void editBook(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String bookId = request.getParameter("bookId");
try {
Book book = bookDAO.getBookById(bookId);
request.setAttribute("book", book);
RequestDispatcher dispatcher = request.getRequestDispatcher("/book_edit.jsp");
dispatcher.forward(request, response);
} catch (SQLException e) {
throw new ServletException(e);
}
}
private void updateBook(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String bookId = request.getParameter("bookId");
String bookName = request.getParameter("bookName");
String author = request.getParameter("author");
double price = Double.parseDouble(request.getParameter("price"));
Book book = new Book();
book.setBookId(bookId);
book.setBookName(bookName);
book.setAuthor(author);
book.setPrice(price);
try {
bookDAO.updateBook(book);
response.sendRedirect("BookServlet");
} catch (SQLException e) {
throw new ServletException(e);
}
}
private void deleteBook(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String bookId = request.getParameter("bookId");
try {
bookDAO.deleteBook(bookId);
response.sendRedirect("BookServlet");
} catch (SQLException e) {
throw new ServletException(e);
}
}
public void destroy() {
try {
conn.close(); // 关闭数据库连接
} catch (SQLException e) {
e.printStackTrace();
}
}
}
```
以上就是一个基本的图书管理系统的设计和实现。当用户发送HTTP请求时,BookServlet会调用相应的DAO方法来处理请求,并将处理结果通过JSP页面呈现给用户。