72 lines
2.2 KiB
Java
72 lines
2.2 KiB
Java
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package com.demo;
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import java.io.*;
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import java.sql.*;
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import javax.servlet.*;
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import javax.servlet.http.*;
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import com.demo.BookBean;
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import javax.sql.DataSource;
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import javax.naming.*;
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import javax.servlet.annotation.WebServlet;
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@WebServlet("/BookQueryServlet2")
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public class BookQueryServlet2 extends HttpServlet {
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/**
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*
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*/
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private static final long serialVersionUID = 1L;
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Connection dbconn;
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public void init() {
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try {
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Context context = new InitialContext();
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DataSource ds = (DataSource)context.lookup("java:comp/env/jdbc/demo");
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dbconn = ds.getConnection();
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} catch(NamingException ne) {
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log("数据源查找失败: " + ne);
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} catch(SQLException se) {
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log("数据库连接失败: " + se);
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}
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}
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public void doPost(HttpServletRequest request, HttpServletResponse response)
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throws ServletException, IOException {
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String bookid = request.getParameter("bookid");
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try {
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String sql = "SELECT * FROM books WHERE bookid = ?";
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PreparedStatement pstmt = dbconn.prepareStatement(sql);
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pstmt.setString(1, bookid);
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ResultSet rst = pstmt.executeQuery();
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if (rst.next()) {
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BookBean book = new BookBean();
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book.setBookid(rst.getString("bookid"));
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book.setTitle(rst.getString("title"));
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book.setAuthor(rst.getString("author"));
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book.setPrice(rst.getDouble("price"));
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book.setPublisher(rst.getString("publisher"));
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request.getSession().setAttribute("book", book);
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response.sendRedirect("/helloweb/displayBook.jsp");
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} else {
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response.sendRedirect("/helloweb/error.jsp");
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}
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rst.close();
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pstmt.close();
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} catch(SQLException e) {
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e.printStackTrace();
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response.sendRedirect("/helloweb/error.jsp");
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}
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}
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public void destroy() {
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try {
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if (dbconn != null && !dbconn.isClosed()) {
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dbconn.close();
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}
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} catch(Exception e) {
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e.printStackTrace();
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}
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}
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}
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