📄 booksearchservlet.java
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package Servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class BookSearchServlet extends HttpServlet {
/**
* Constructor of the object.
*/
public BookSearchServlet() {
super();
}
/**
* Destruction of the servlet. <br>
*/
public void destroy() {
super.destroy(); // Just puts "destroy" string in log
// Put your code here
}
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out
.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.print(" This is ");
out.print(this.getClass());
out.println(", using the GET method");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
response.setCharacterEncoding("gb2312");
request.setCharacterEncoding("gb2312");
/*----------------------------------Start MyCode------------------------------------*/
String bookID = request.getParameter("bookID");System.out.println(bookID);
String bookName = request.getParameter("bookName");System.out.println(bookName);
String bookauthor = request.getParameter("author");System.out.println(bookauthor);
String bookPress = request.getParameter("press");System.out.println(bookPress);
int count = 0;
String sql = null;
// String sql = "select * from book where ";
if(bookID != null && bookID.length() != 0)
{
count = count + 1;
// sql = sql + "bookID = " + bookID;
}
if(bookName != null && bookName.length() != 0)
{
count = count + 2;
// sql = sql + ",bookName";
}
if(bookauthor != null && bookauthor.length() != 0)
{
count = count + 4;
// sql =
}
if(bookPress != null && bookPress.length() != 0)
{
// count = count + 8;
// sql = sql + "";
}
// sql = sql + "";
if(0 == count)
{
request.setAttribute("msg", "查询条件不能为空");
request.getRequestDispatcher("/BookSearch.jsp").forward(request, response);
}
else if(1 == count)
{
sql = "select * from book where bookID = '" + bookID + "'";
}
else if(2 == count)
{
sql = "select * from book where bookName = '" + bookName + "'";
}
else if(3 == count)
{
sql = "select * from book where bookID = '" + bookID + "'and bookName = '" + bookName + "'";
}
else if(4 == count)
{
sql = "select * from book where author = '" + bookauthor + "'";
}
else if(5 == count)
{
sql = "select * from book where bookID = '" + bookID + "'and author = '" + bookauthor + "'";
}
else if(6 == count)
{
sql = "select * from book where bookName = '" + bookName + "'and author = '" + bookauthor + "'";
}
else if(7 == count)
{
sql = "select * from book where bookID = '" + bookID + "'and bookName = '" + bookName +"'and author = '" + bookauthor + "'";
}
// else if(8 == count)
// {
// sql = "select * from book where press = '" + bookPress + "'";
// }
System.out.println(sql);
ArrayList<Bean.BookBean> arraylist = new Bean.BookQuery().booksearch(sql);
request.setAttribute("bookarray", arraylist);
request.getRequestDispatcher("/ShowSearchBook.jsp").forward(request, response);
/*----------------------------------End MyCode--------------------------------------*/
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
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