10.29日进度报告

做了一个查询界面，吸收了杨子光老师给的教训，空按按钮，查询显示所有内容

package test2;

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 test2.table;
import test2.DBUtil;

/**
 * Servlet implementation class queryTable
 */
@WebServlet("/queryTable")
public class queryTable extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public queryTable() {
        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 type=request.getParameter("type");
        if(type.equals("all"))
        {
            ArrayList<table> list=DBUtil.gettables("all");
            request.setAttribute("list", list);
            request.getRequestDispatcher("chaxun.jsp").forward(request, response);
        }
        else
        {
            String value=request.getParameter("value");
            System.out.println(value);
            if(value.length()!=0) {
                ArrayList<table> list=DBUtil.getDocesByCase(type,value);
                request.setAttribute("list", list);
                request.getRequestDispatcher("chaxun.jsp").forward(request, response);
            }
            else {
                ArrayList<table> list=DBUtil.gettables("all");
                request.setAttribute("list", list);
                request.getRequestDispatcher("chaxun.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 test2;

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 org.apache.catalina.User;



import test2.table;



public class DBUtil {
    //数据库URL和账号密码
    private static final String connectionURL="jdbc:mysql://127.0.0.1:3306/doc_system?useUnicode=true&characterEncoding=GB18030&useSSL=false&serverTimezone=GMT&allowPublicKeyRetrieval=true";
    private static final String username="root";
    private static final String password="123456";
    
    //数据库连接
    public static Connection getConnection()
    {
        try {
            Class.forName("com.mysql.cj.jdbc.Driver");
            return DriverManager.getConnection(connectionURL,username,password);
        } catch (Exception e) {
            // TODO: handle exception
            System.out.println("数据库连接失败");
            e.printStackTrace();
            return null;
        }
    }
    public static void closeAll(Connection connection,PreparedStatement statement,ResultSet rSet)
    {
        try {
            if(connection!=null)
                connection.close();
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
    
        try {
            if(statement!=null)
                statement.close();
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
    
        try {
            if(rSet!=null)
                rSet.close();
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
    }
        
    //关闭connection和preparedstatement
    public static void closePart(Connection connection,PreparedStatement statement)
    {
        try {
            if(connection!=null)
                connection.close();
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
    
        try {
            if(statement!=null)
                statement.close();
        } catch (SQLException e) {
            // TODO 自动生成的 catch 块
            e.printStackTrace();
        }
    }
        
    public static void main(String[] args) {
        //getConnection();
        
    }
    public static ArrayList<table> gettables(String type) {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rSet=null;
        try {
            connection=getConnection();
            String sql;
            System.out.println(type);
            sql="select * from t_table";
            preparedStatement=connection.prepareStatement(sql);
            rSet=preparedStatement.executeQuery();
            ArrayList<table> list=new ArrayList<>();
            while(rSet.next())
            {
                table doc=new table();
                doc.setId(rSet.getInt("id"));
                doc.setJgmc(rSet.getString("jgmc"));
                doc.setXssh(rSet.getString("xssh"));
                doc.setBmsh(rSet.getString("bmsh"));
                doc.setGlcs(rSet.getString("glcs"));
                doc.setResult(rSet.getInt("result"));
                list.add(doc);
            }
            return list;
        } catch (SQLException e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        finally {
            closeAll(connection, preparedStatement, rSet);
        }
        return null;
    }
    public static ArrayList<table> getDocesByCase(String type, String value) {
        Connection connection=null;
        PreparedStatement preparedStatement=null;
        ResultSet rSet=null;
        try {
            connection=getConnection();
            String sql="";
            System.out.println(type);
            if(type.equals("jgmc"))
            {
                sql="select * from t_table where jgmc='"+value+"'";
            }
            else if(type.equals("sfsh"))
            {
                sql="select * from t_table where sfsh='"+value+"'";
            }
            else if(type.equals("bmsfsh"))
            {
                sql="select * from t_table where bmsfsh='"+value+"'";
            }
            else if(type.equals("result"))
            {
                sql="select * from t_table where result='"+value+"'";
            }
            preparedStatement=connection.prepareStatement(sql);
            rSet=preparedStatement.executeQuery();
            ArrayList<table> list=new ArrayList<>();
            while(rSet.next())
            {
                table doc=new table();
                doc.setId(rSet.getInt("id"));
                doc.setJgmc(rSet.getString("jgmc"));
                doc.setXssh(rSet.getString("xssh"));
                doc.setBmsh(rSet.getString("bmsh"));
                doc.setGlcs(rSet.getString("glcs"));
                doc.setResult(rSet.getInt("result"));
                list.add(doc);
            }
            return list;
        } catch (SQLException e) {
            // TODO: handle exception
            e.printStackTrace();
        }
        finally {
            closeAll(connection, preparedStatement, rSet);
        }
        return null;
    }
}

<%@page import="test2.DBUtil"%>
<%@page import="test2.table"%>
<%@page import="java.util.ArrayList"%>
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
 <link rel="stylesheet" href="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
 <script src="https://cdn.staticfile.org/jquery/3.2.1/jquery.min.js"></script>
 <script src="https://cdn.staticfile.org/popper.js/1.15.0/umd/popper.min.js"></script>
 <script src="https://cdn.staticfile.org/twitter-bootstrap/4.3.1/js/bootstrap.min.js"></script>
<title>Insert title here</title>
<style>
.form-group{
35%;
float:left;
margin-left:10px;
margin-top:10px;
}
label{
30%;
float:left;
margin-right:5px;
margin-top:5px;
}
.form-control{
60%;
}
.btn{
100px;
height:40px;
border:0px;
border-radius:5px;
background-color:orange;
color:black;
margin-left:20px;
margin-top:10px
}
</style>
</head>
<body>
    <div>
        <div class="form-group">
            <label for="type">请选择查询类型：</label>
            <select class="form-control" id="type">
                <option value="jgmc">机构全称</option>
                <option value="sfsh">形式审核</option>
                <option value="bmsfsh">部门审核</option>
            </select>
        </div>
        <div class="form-group">
            <label for="content">请输入查询内容:</label>
            <input type="text" class="form-control" id="content">
        </div>
        <div>
            <input type="button" class="btn" value="查询" onclick="query()">
        </div>
    </div>
    <div>
        <table class="table table-hover table-striped table-bordered table-sm">
            <tr>
                <th>编号</th>
                <th>机构全称</th>
                <th>形式审核</th>
                <th>部门审核</th>
                <th>管理处室</th>
            </tr>
            <%ArrayList<table> list=(ArrayList<table>)request.getAttribute("list"); %>
            <c:forEach var="l" items="<%=list %>" varStatus="i">
                <tr>
                    <td id="id${i.index+1 }">${l.getId() }</td>
                    <td>${l.getJgmc() }</td>
                    <td>${l.getXssh() }</td>
                    <td>${l.getBmsh() }</td>
                    <td>${l.getGlcs() }</td>
                </tr>
            </c:forEach>
        </table>
    </div>
</body>
<script>
    function query(){
        var sel=document.getElementById("type");
        var type=sel.options[sel.selectedIndex].value;
        var value=$("#content").val();
        window.location="queryTable?type="+type+"&value="+value;
    }
</script>
</html>