帮我写《建设工程监管信息系统》交易流程步骤列表显示模块代码

好的，下面是《建设工程监管信息系统》交易流程步骤列表显示模块的代码示例。为了简化代码，这里将只列出关键部分，具体实现可以根据实际需求进行修改：

1. FlowStepBean.java

package com.construction.monitor.bean;

public class FlowStepBean {
    private int id;
    private String name;
    private String description;
    private String createTime;
    private String updateTime;

    // getter and setter methods
}

2. FlowStepDAO.java

package com.construction.monitor.dao;

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

import com.construction.monitor.bean.FlowStepBean;
import com.construction.monitor.util.DBUtil;

public class FlowStepDAO {
    private Connection conn = null;
    private PreparedStatement pstmt = null;
    private ResultSet rs = null;

    // 添加交易流程步骤
    public boolean addFlowStep(FlowStepBean flowStep) {
        boolean flag = false;
        String sql = "INSERT INTO T_flow_step_def(name, description, create_time, update_time) VALUES(?, ?, ?, ?)";

        try {
            conn = DBUtil.getConnection();
            pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, flowStep.getName());
            pstmt.setString(2, flowStep.getDescription());
            pstmt.setString(3, flowStep.getCreateTime());
            pstmt.setString(4, flowStep.getUpdateTime());
            int result = pstmt.executeUpdate();
            if(result > 0) {
                flag = true;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.closeAll(rs, pstmt, conn);
        }
        return flag;
    }

    // 删除交易流程步骤
    public boolean deleteFlowStep(int id) {
        boolean flag = false;
        String sql = "DELETE FROM T_flow_step_def WHERE id = ?";

        try {
            conn = DBUtil.getConnection();
            pstmt = conn.prepareStatement(sql);
            pstmt.setInt(1, id);
            int result = pstmt.executeUpdate();
            if(result > 0) {
                flag = true;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.closeAll(rs, pstmt, conn);
        }
        return flag;
    }

    // 修改交易流程步骤
    public boolean updateFlowStep(FlowStepBean flowStep) {
        boolean flag = false;
        String sql = "UPDATE T_flow_step_def SET name = ?, description = ?, update_time = ? WHERE id = ?";

        try {
            conn = DBUtil.getConnection();
            pstmt = conn.prepareStatement(sql);
            pstmt.setString(1, flowStep.getName());
            pstmt.setString(2, flowStep.getDescription());
            pstmt.setString(3, flowStep.getUpdateTime());
            pstmt.setInt(4, flowStep.getId());
            int result = pstmt.executeUpdate();
            if(result > 0) {
                flag = true;
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.closeAll(rs, pstmt, conn);
        }
        return flag;
    }

    // 查询所有交易流程步骤
    public List<FlowStepBean> getFlowStepList() {
        List<FlowStepBean> list = new ArrayList<FlowStepBean>();
        String sql = "SELECT id, name, description, create_time, update_time FROM T_flow_step_def";

        try {
            conn = DBUtil.getConnection();
            pstmt = conn.prepareStatement(sql);
            rs = pstmt.executeQuery();
            while(rs.next()) {
                FlowStepBean flowStep = new FlowStepBean();
                flowStep.setId(rs.getInt("id"));
                flowStep.setName(rs.getString("name"));
                flowStep.setDescription(rs.getString("description"));
                flowStep.setCreateTime(rs.getString("create_time"));
                flowStep.setUpdateTime(rs.getString("update_time"));
                list.add(flowStep);
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            DBUtil.closeAll(rs, pstmt, conn);
        }
        return list;
    }
}

3. FlowStepServlet.java

package com.construction.monitor.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.construction.monitor.bean.FlowStepBean;
import com.construction.monitor.dao.FlowStepDAO;

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

    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doGet(request, response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String action = request.getParameter("action");
        FlowStepDAO flowStepDAO = new FlowStepDAO();

        // 添加交易流程步骤
        if("add".equals(action)) {
            String name = request.getParameter("name");
            String description = request.getParameter("description");
            FlowStepBean flowStep = new FlowStepBean();
            flowStep.setName(name);
            flowStep.setDescription(description);
            flowStep.setCreateTime(System.currentTimeMillis() + "");
            flowStep.setUpdateTime(flowStep.getCreateTime());
            if(flowStepDAO.addFlowStep(flowStep)) {
                response.sendRedirect("flow_step_list.jsp");
            } else {
                response.sendRedirect("error.jsp");
            }
        }

        // 删除交易流程步骤
        if("delete".equals(action)) {
            int id = Integer.parseInt(request.getParameter("id"));
            if(flowStepDAO.deleteFlowStep(id)) {
                response.sendRedirect("flow_step_list.jsp");
            } else {
                response.sendRedirect("error.jsp");
            }
        }

        // 修改交易流程步骤
        if("update".equals(action)) {
            int id = Integer.parseInt(request.getParameter("id"));
            String name = request.getParameter("name");
            String description = request.getParameter("description");
            FlowStepBean flowStep = new FlowStepBean();
            flowStep.setId(id);
            flowStep.setName(name);
            flowStep.setDescription(description);
            flowStep.setUpdateTime(System.currentTimeMillis() + "");
            if(flowStepDAO.updateFlowStep(flowStep)) {
                response.sendRedirect("flow_step_list.jsp");
            } else {
                response.sendRedirect("error.jsp");
            }
        }

        // 查询所有交易流程步骤
        if("list".equals(action)) {
            List<FlowStepBean> list = flowStepDAO.getFlowStepList();
            request.setAttribute("list", list);
            request.getRequestDispatcher("flow_step_list.jsp").forward(request, response);
        }
    }
}

4. flow_step_list.jsp

<%@ 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 charset="UTF-8">
<title>交易流程步骤列表</title>
</head>
<body>
	<h1>交易流程步骤列表</h1>
	<table border="1">
		<tr>
			<th>编号</th>
			<th>名称</th>
			<th>描述</th>
			<th>创建时间</th>
			<th>修改时间</th>
			<th>操作</th>
		</tr>
		<c:forEach var="flowStep" items="${list}">
			<tr>
				<td>${flowStep.id}</td>
				<td>${flowStep.name}</td>
				<td>${flowStep.description}</td>
				<td>${flowStep.createTime}</td>
				<td>${flowStep.updateTime}</td>
				<td>
					<a href="flowStepServlet?action=delete&id=${flowStep.id}">删除</a>
					<a href="flow_step_edit.jsp?id=${flowStep.id}&name=${flowStep.name}&description=${flowStep.description}">修改</a>
				</td>
			</tr>
		</c:forEach>
	</table>
	<a href="flow_step_add.jsp">添加交易流程步骤</a>
</body>
</html>

通过以上代码示例，可以实现对交易流程步骤的增加、删除、修改和查询等操作，并在flow_step_list.jsp页面中显示交易流程步骤的列表信息。