01: 流程分析和数据库建表阶段
02: 编写和配置过滤器（防止页面乱码）
03:项目搭建 & 工具类的实现 &依赖导入
04: 建立数据库的实体类（pojo）
05: 实现登录功能
06: 查询所有书籍功能
07:模糊查询功能
08:页面所有功能实现（附源码下载）
2.0 实现-06: 查询所有书籍功能
刚刚页面跳转过去以后，页面并没有值，现在我们在跳转过去的时候，就从后台数据库取值
2.0.1 创建 BookDao
BookDao.java
package com.tian.dao.book;import com.tian.pojo.Book;import java.sql.Connection;import java.util.List;/*** ClassName: BookDao* Description: books表的dao层** @author Tianjiao* @date /5/28 14:26*/public interface BookDao {/*** MethodName: getAllBook* Description: 查询所有的书籍*/public List<Book> getAllBook(Connection connection) throws Exception;}
2.0.1 创建 BookDaoImpl
BookDaoImpl.java
package com.tian.dao.book;import com.tian.pojo.Book;import com.tian.utils.BaseDao;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.util.ArrayList;import java.util.List;/*** ClassName: BookDaoImpl* Description: BookDao的实现类* * @author Tianjiao* @date /5/28 14:27*/public class BookDaoImpl implements BookDao {@Overridepublic List<Book> getAllBook(Connection connection) throws Exception {PreparedStatement preparedStatement = null;ResultSet rs = null;List<Book> books = new ArrayList<>();Book book = null;if (null != connection) {String sql = "select * from `books`";Object[] params = {};rs = BaseDao.executeQuery(connection, preparedStatement, rs, sql, params);int i = 0;while (rs.next()) {book = new Book();book.setInventory(rs.getInt("inventory"));book.setBookName(rs.getString("bookName"));book.setBookId(rs.getString("bookId"));book.setAuthor(rs.getString("author"));books.add(book);}BaseDao.closeResource(connection, preparedStatement, rs);}return books;}}
2.0.3 创建 BookService
BookService.java
package com.tian.service.book;import com.tian.pojo.Book;import java.util.List;/*** ClassName: BookService* Description: Books的service层** @author Tianjiao* @date /5/28 14:51*/public interface BookService {/*** MethodName: getAllBooks* Description: 获得所有的书籍*/public List<Book> getAllBooks() throws Exception;}
2.0.4 创建 BookServiceImpl
BookServiceImpl.java
package com.tian.service.book;import com.tian.dao.book.BookDaoImpl;import com.tian.pojo.Book;import com.tian.utils.BaseDao;import java.sql.Connection;import java.util.List;/*** ClassName: BookServiceImpl* Description: BookService的实现类** @author Tianjiao* @date /5/28 14:51*/public class BookServiceImpl implements BookService {@Overridepublic List<Book> getAllBooks() throws Exception {Connection connection = BaseDao.getConnection();return new BookDaoImpl().getAllBook(connection);}}
2.0.5 创建 AllBookServlet
AllBookServlet.jsp
package com.tian.servlet.book;import com.tian.pojo.Book;import com.tian.service.book.BookServiceImpl;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.util.List;/*** ClassName: BookServlet* Description: 查询所有书籍的请求** @author Tianjiao* @date /5/29 10:30*/public class AllBookServlet extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) {try {List<Book> books = new BookServiceImpl().getAllBooks();if (books != null) {req.setAttribute("books", books);req.getRequestDispatcher("static/jsp/index.jsp").forward(req, resp);}} catch (Exception e) {e.printStackTrace();}}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws EnumConstantNotPresentException {this.doGet(req, resp);}}
2.0.6 配置 AllBookServlet
web.xml
<servlet><servlet-name>AllBookServlet</servlet-name><servlet-class>com.tian.servlet.book.AllBookServlet</servlet-class></servlet><servlet-mapping><servlet-name>AllBookServlet</servlet-name><url-pattern>/books</url-pattern></servlet-mapping>
2.0.7 修改 LoginServlet
修改 LoginServlet 使其在通过 /books 请求进入index.jsp页面
