每日日报2021.5.22

今天完成内容：

学习web

  连接数据库，爬取数据 servlet层

package servlet;

import java.io.IOException;

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 bean.User;
import dao.UserDao;

@WebServlet("/addServlet")
public class AddServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
UserDao dao=new UserDao();

/**
* @see HttpServlet#HttpServlet()
*/
public AddServlet() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
String id = request.getParameter("id");
String name = request.getParameter("name");
String link = request.getParameter("link");
User bean=new User();
bean.setId(id);
bean.setName(name);
bean.setLink(link);
int result=dao.adduser(bean);
if(result==1) {
request.setAttribute("message", "yes");
request.getRequestDispatcher("index.jsp").forward(request, response);
}else
{
request.setAttribute("message", "error");
request.getRequestDispatcher("add.jsp").forward(request, response);
}

}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

package servlet;

import java.io.IOException;
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 dao.UserDao;

@WebServlet("/Delete")
public class Delete extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public Delete() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
String id = request.getParameter("id");
System.out.println(id);
UserDao dao=new UserDao();
int result=dao.del(id);
if (result==1) {
request.setAttribute("message", "yes");
request.getRequestDispatcher("index.jsp").forward(request, response);
}else {
request.setAttribute("message", "no");
request.getRequestDispatcher("index.jsp").forward(request, response);
}

}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

package servlet;

import java.util.Map;

import java.io.IOException;
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 dao.UserDao;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

/**
* Servlet implementation class lalala
*/
@WebServlet("/lalala")
public class lalala extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public lalala() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
int neednum=Integer.parseInt(request.getParameter("xxx"));
Map<String, Integer>sortMap=UserDao.getrc();
JSONArray json =new JSONArray();
int k=0;
for (Map.Entry<String, Integer> entry : sortMap.entrySet())
{
JSONObject ob=new JSONObject();
ob.put("name", entry.getKey());
ob.put("value", entry.getValue());
if(!(entry.getKey().equals("for")||entry.getKey().equals("and")||entry.getKey().equals("With")||entry.getKey().equals("of")||entry.getKey().equals("in")||entry.getKey().equals("From")||entry.getKey().equals("A")||entry.getKey().equals("to")||entry.getKey().equals("a")||entry.getKey().equals("the")||entry.getKey().equals("by")))
{
json.add(ob);
k++;
}
if(k==neednum)
break;
}
System.out.println(json.toString());

response.getWriter().write(json.toString());
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

package servlet;

import java.io.IOException;
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 bean.User;
import dao.UserDao;

/**
* Servlet implementation class Select
*/
@WebServlet("/Select")
public class Select extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public Select() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
String content = request.getParameter("content");
String way = request.getParameter("way");
ArrayList<User> list=null;
UserDao dao=new UserDao();
list=dao.select(content,way);
request.setAttribute("list", list);
request.getRequestDispatcher("index.jsp").forward(request, response);
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

package servlet;

import java.io.IOException;
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 bean.User;
import dao.UserDao;

/**
* Servlet implementation class Update
*/
@WebServlet("/update")
public class Update extends HttpServlet {
private static final long serialVersionUID = 1L;
UserDao dao=new UserDao();

/**
* @see HttpServlet#HttpServlet()
*/
public Update() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
String id = request.getParameter("id");
User bean=null;
bean=dao.searchbyId(id);
request.setAttribute("bean", bean);
request.getRequestDispatcher("update.jsp").forward(request, response);

}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

package servlet;

import java.io.IOException;
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 bean.User;
import dao.UserDao;

/**
* Servlet implementation class UpdateSave
*/
@WebServlet("/updatesave")
public class UpdateSave extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public UpdateSave() {
super();
// TODO Auto-generated constructor stub
}

/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
String id = request.getParameter("id");
String name = request.getParameter("name");
String link = request.getParameter("link");
User bean=new User();
bean.setId(id);
bean.setName(name);
bean.setLink(link);
UserDao dao=new UserDao();
int result=dao.update(bean);
if(result==1) {
request.setAttribute("message", "淇�敼鎴愬姛");
request.getRequestDispatcher("index.jsp").forward(request, response);
}else
{
request.setAttribute("message", "淇�敼澶辫触");
request.getRequestDispatcher("update?sno=sno").forward(request, response);
}
}

/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}

}

看视频

遇到问题：

无

明日目标：

学习web端的开发

学习css