teeth/code/QueryArticleServlet.java

package com.demo;

import java.io.IOException;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.domain.Article;

/**
 * Servlet implementation class TuserServlet
 */
@WebServlet(name = "queryarticleServlet", urlPatterns = { "/query-article" })
public class QueryArticleServlet extends HttpServlet {
	 private static final long serialVersionUID = 1L; 
	   Connection dbconn=null;
	   public void init() {   
		   String driver = "com.mysql.cj.jdbc.Driver";
		      String dburl = "jdbc:mysql://127.0.0.1:3306/tooth?useSSL=true";
		      String username = "root";
		      String password = "root";
		      try{
		          Class.forName(driver); // 加载驱动程序
		          // 创建连接对象
		          dbconn = DriverManager.getConnection(
		      	                     dburl,username,password);
		      }catch(ClassNotFoundException e1){
		          System.out.println(e1);
		          getServletContext().log("驱动程序类找不到！");   
		      }catch(SQLException e2){
		    	  System.out.println(e2);
		      }
		   }
	   
	 
	public void doGet(HttpServletRequest request,
              HttpServletResponse response)
              throws ServletException,IOException{
		
		
ArrayList<Article> articleList = null; 
articleList = new ArrayList<Article>();
try{
	 String sql="SELECT * FROM Article";
     PreparedStatement pstmt = dbconn.prepareStatement(sql);
ResultSet rst = pstmt.executeQuery();
while(rst.next()){
	Article s = new Article();
  s.setAid(rst.getInt("aid"));
     s.setUid(rst.getString("uid"));
    s.setUname(rst.getString("uname"));
     s.setDate(rst.getDate("date"));
     s.setTitle(rst.getString("title"));
     s.setContent(rst.getString("content"));
     s.setStatics(rst.getString("statics"));
     s.setMid(rst.getString("mid"));
     articleList.add(s);
}
if(!articleList.isEmpty()){
    request.getSession().setAttribute("ArticleList",articleList);
    response.sendRedirect("da-article.jsp");
}else{
  response.sendRedirect("error.jsp");
}
}catch(SQLException e){
  e.printStackTrace();
}
	}
//	public void doPost(HttpServletRequest request,
//    HttpServletResponse response)
//throws ServletException,IOException{
//String id=request.getParameter("Doid");
//try{
//String sql="SELECT * FROM Schedule WHERE Doid = ?";
//PreparedStatement pstmt=dbconn.prepareStatement(sql);
//pstmt.setString(1,id);
//ResultSet rst=pstmt.executeQuery();
//if(rst.next()){
//Tuser tuser = new Tuser();
//tuser.setUid(rst.getString("Uid"));
//tuser.setUname(rst.getString("uname"));
//tuser.setUpassword(rst.getString("upassword"));
//tuser.setUsex(rst.getString("usex"));
//tuser.setUage(rst.getString("uage"));
//tuser.setUtel(rst.getString("utel"));
//tuser.setCid(rst.getString("cid"));
//
//request.getSession().setAttribute("tuser", tuser);
//response.sendRedirect("displaySchedule.jsp");
//}else{
//response.sendRedirect("error.jsp");
//}	
//}catch(SQLException e){
//e.printStackTrace();
//}
//}

	      public void destory() {
	          try {
	 	         dbconn.close();
	 	      }catch(Exception e){
	 		     e.printStackTrace();
	         }
	      }
	   }