ztree 增删修改---修改节点

前言

上一篇我们已经学习过了删除节点的实现，对于修改节点就简单多了，因为上一篇中已经实现了大部分的代码，这里只需添加一些代码就可以了。

实现

为了改动较少，所以我们不去掉上篇中已经实现的删除的功能，就让修改和删除共存！

代码如下：

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>















jsp/servelt 目录树的添加、删除和修改（请不要删除根节点）

			

		

 

CityDAO代码：

package util;

import java.util.List;

public interface CityDAO {
	public List findTypeChildrenById(Integer id);
	public void deleteCity(Integer id);
	public void editCity(Integer id, String city);  //修改
}

CityImpl代码（仅给出修改功能代码）：

public void editCity(Integer id, String city) {
		Connection conn = null;
		PreparedStatement ps = null;
		try{   
				conn = DbUtil.getConnection();
				String sql = "update essaytype set province = ? where id = ?";
				ps = conn.prepareStatement(sql);
				ps.setString(1, city);
				ps.setInt(2, id);
				ps.execute();	
			}catch(Exception e){
				e.printStackTrace();
			}finally{
				DbUtil.closeAll(conn, ps);
			}
	}

修改处理函数editCityServlet:

package util;

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.sun.org.apache.xalan.internal.xsltc.compiler.Template;

import net.sf.json.JSONObject;

/**
 * Servlet implementation class EditCityServlet
 */
@WebServlet("/EditCityServlet")
public class EditCityServlet extends HttpServlet {
	private static final long serialVersionUID = 1L;
    private CityDAO c = new CityImpl();
    /**
     * @see HttpServlet#HttpServlet()
     */
    public EditCityServlet() {
        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");
		Integer id      =  Integer.parseInt(request.getParameter("id"));
		String  city = request.getParameter("name");
		Integer pId = Integer.parseInt(request.getParameter("pId"));
		List cities = c.findTypeChildrenById(pId);
		String msg ="";
		boolean flag = true;   //成功或者失败的标志
		for(City  temp:cities){          //遍历孩子节点  看看名称是否重复
			if(temp.getCity().equals(city)){
				flag= false;
				break;
			}
		}
		if(flag){
			c.editCity(id, city);
			msg = "修改成功！";
		}
		else {
			msg = "修改失败，同一级下该名称已存在，请尝试修改为其它名称！";
		}
		JSONObject jO = new JSONObject();
		jO.put("msg", msg);
		jO.put("success", flag);
		response.setContentType("application/json;charset=utf-8");
		response.getWriter().println(jO.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);
	}

效果图：

代码地址

https://github.com/SpecialYy/ztree-demo-practice