每日学习（个人作业2）

对于个人作业2的show页面的后台处理

servlet

package servlet;

import java.io.IOException;
import java.util.List;

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.google.gson.Gson;

import bean.Bean;
import dao.Dao;

/**
 * Servlet implementation class Servlet
 */
@WebServlet("/Servlet")
public class Servlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Servlet() {
        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 word=request.getParameter("word");
        Dao dao=new Dao();
        List<Bean> list=dao.findtitle(word);
        Gson gson = new Gson();        
        response.setContentType("text/html;charset=utf-8");
        String json = gson.toJson(list);
        System.out.println(json);
        response.getWriter().write(json);
	}

	/**
	 * @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);
	}

}

 getmax：

package servlet;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Map;

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.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import java.util.*;

import dao.Dao;

/**
 * Servlet implementation class getmax
 */
@WebServlet("/getmax")
public class getmax extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public getmax() {
        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");
		response.setContentType("text/html;charset=utf-8");	
		Dao dao=new Dao();
        Map<String, Integer>sortMap=dao.getallmax();
        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==10)
                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);
	}

}

 数据库的处理：

public List<Bean> findtitle(String name) {
        String sql="select * from cvpr where title like '%"+name+"%'";
        Connection con=null;
        Statement state=null;
        ResultSet rs=null;
        boolean flag=false;
        try {
			con=Util.getConnection();
		} catch (SQLException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}
        Bean bean=null;
        List<Bean> list=new ArrayList<Bean>();
        try {
            state=con.createStatement();
            rs=state.executeQuery(sql);
            while(rs.next())
            {
                bean=new Bean();
                bean.setTitle(rs.getString("title"));
                bean.setLink(rs.getString("link"));
                list.add(bean);
            }
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
        Util.close(con,state,rs);
        return list;    
    }
public Map<String,Integer> getallmax()
    {
        String sql="select * from cvpr";
        Map<String, Integer>map=new HashMap<String, Integer>();
        Map<String, Integer>sorted=new HashMap<String, Integer>();
        Connection con=null;
        Statement state=null;
        ResultSet rs=null;
        try {
            con=Util.getConnection();
        } catch (SQLException e3) {
            // TODO Auto-generated catch block
            e3.printStackTrace();
        }
        try {
            state=con.createStatement();
            rs=state.executeQuery(sql);
            while(rs.next())
            {
                String keywords=rs.getString("keywords");
                String[] split = keywords.split(",");
                for(int i=0;i<split.length;i++)
                {
                    if(map.get(split[i])==null)
                    {
                        map.put(split[i],0);
                    }
                    else
                    {
                        map.replace(split[i], map.get(split[i])+1);
                    }
                }
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        Util.close( con, state,rs);
        sorted = map
                .entrySet()
                .stream()
                .sorted(Collections.reverseOrder(Map.Entry.comparingByValue()))
                .collect(
                        Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue, (e1, e2) -> e2,
                                LinkedHashMap::new));
        return sorted;
    }