每日学习（个人作业2）

今天完成个人作业2，但是之后会继续进行完善，对于图表联动进行优化。

对于之前的个人作业的后台处理：

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 ConditionServlet
 */
@WebServlet("/ConditionServlet")
public class ConditionServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public ConditionServlet() {
        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");
		String condition=request.getParameter("condition");
//		String delete=request.getParameter("delete");
		System.out.println(condition);
		if("title".equals(condition)) {
			String qution=request.getParameter("qution");
			Dao dao=new Dao();
			List<Bean> list=dao.findtitle(qution);
			Gson gson = new Gson();        
			String json = gson.toJson(list);
			System.out.println(json);
			response.getWriter().write(json);
		}
		else if("num".equals(condition)) {
			String qution=request.getParameter("qution");
			Dao dao=new Dao();
			List<Bean> list=dao.findNum(qution);
			Gson gson = new Gson();        
			String json = gson.toJson(list);
			System.out.println(json);
			response.getWriter().write(json);
		}
		else if("keyword".equals(condition)) {
			String qution=request.getParameter("qution");
			Dao dao=new Dao();
			List<Bean> list=dao.findKeyWord(qution);
			Gson gson = new Gson();        
			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);
	}

}

 这是对多条件查询的处理。

多条件的数据库处理：

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 List<Bean> findKeyWord(String name) {
        String sql="select * from cvpr where keywords 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 List<Bean> findNum(String num){
		String sql="select * from cvpr where id="+num;
        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; 
	}