MyBatis-Plus增删改查（有单表分页，3表的请看我其他的文章）

package cn.com.befery.dataai.controller;

import java.util.Date;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import com.baomidou.mybatisplus.mapper.EntityWrapper;
import com.baomidou.mybatisplus.plugins.Page;

import cn.com.befery.dataai.constants.AIAppConstants;
import cn.com.befery.dataai.interceptor.BaseInterceptor;
import cn.com.befery.dataai.po.User;
import cn.com.befery.dataai.service.UserService;
import cn.com.befery.dataai.utils.AIAppUtils;
import cn.com.befery.dataai.vo.ResponseData;
import cn.com.befery.dataai.vo.ResultCode;
import cn.com.befery.dataai.vo.SearchParam;

@Controller
@RequestMapping("/user")
public class UserController extends BaseController {
	private final static Logger logger = LoggerFactory.getLogger(ModelController.class);

	@Autowired
	private UserService userService;

	@RequestMapping("")
	public String user() {
		return "user-list";
	}

	/**
	 * 前台传递的URL：/users/usersPage
	 * 
	 * @param param
	 * @param request
	 * @return
	 */
	@ResponseBody
	@GetMapping(value = "/usersPage")
	public ResponseData usersPage(SearchParam param,String userName, HttpServletRequest request) {
		logger.info("usersPage ...........");
		String orderNO = request.getParameter("order[0][column]");
		String order = request.getParameter("columns[" + orderNO + "][name]");
		String orderdir = request.getParameter("order[0][dir]");
		
		EntityWrapper<User> ew = new EntityWrapper<>();
		ew.like("user_name", userName).orderBy(order, "asc".equals(orderdir) ? true : false);

		Page<User> pageDate = userService.selectPage(new Page<User>(param.getStart(), param.getLength()), ew);

		return responseData(param.getDraw(), pageDate);
	}

	/**
	 * 密码重置
	 * 
	 * @param userID
	 * @return
	 */
	@ResponseBody
	@RequestMapping(value = "/resetSecret")
	public ResultCode userResetPassword(Long userID,HttpSession session) {
		logger.info("userResetPassword ...........");
		User sessionUser = (User) session.getAttribute("sessionUser");
		ResultCode res = new ResultCode();
		
		if("admin".equals(sessionUser.getUserName())) {
			
			String newpassword = "111111";
			EntityWrapper<User> ew = new EntityWrapper<>();
			String setSql = "pass_word = " + "'" + AIAppUtils.encrypt(newpassword) + "'";
			ew.eq("user_id",userID);
			
			boolean flag = userService.updateForSet(setSql, ew);
			
			if (flag) {
				res.setCode(0);
				res.setMsg("11111111");
			} else {
				res.setCode(1);
			}
	
		}else {
			res.setCode(1);
			res.setMsg("没有权限");
		}
				return res;
	}

	/**
	 * 添加用户(admin才能操作)
	 * 
	 * @author zhangxuewei
	 * @param user
	 * @return
	 */
	@ResponseBody
	@RequestMapping(value = "/addUser", method = RequestMethod.POST)
	public ResultCode addUser(User user, HttpSession session) {
		logger.info("addUser ...........");
		User sessionUser = (User) session.getAttribute("sessionUser");
		ResultCode res = new ResultCode();

		if (("admin").equals(sessionUser.getUserName())) {

			if (StringUtils.isNotBlank(user.getUserName()) && StringUtils.isNotBlank(user.getPassWord())) {
				String newName = user.getUserName();
				EntityWrapper<User> ew = new EntityWrapper<>();
				ew.eq("user_name", newName);
				// 添加之前先进行判断 给用户是否已经存在 不存在才可以添加
				if (userService.selectOne(ew) == null) {
					user.setCreateDate(new Date());
					String pwd = AIAppUtils.encrypt(user.getPassWord());
					user.setPassWord(pwd);
					user.setStatus(AIAppConstants.STATUS); // 1
					try {
						userService.insert(user);
						res.setCode(0);
					} catch (Exception e) {
						res.setCode(1);
					}
				} else {
					res.setCode(1);
					res.setMsg("用户名重复");
				}
			} else {
				res.setCode(1);
				res.setMsg("参数不能为空");
			}
		} else {
			res.setCode(1);
			res.setMsg("没有权限（admin用户可操作）");
		}
		return res;
	}

	/**
	 * 删除用户(admin才能操作)
	 * 
	 * @RequestParam(value = "userID")
	 * @author zhangxuewei
	 * @param userID
	 */
	@ResponseBody
	@RequestMapping(value = "/deleteUser", method = RequestMethod.POST)
	public ResultCode deleteUser(Long userID, HttpSession session) {
		logger.info("deleteUser ...........");
		User user1 = (User) session.getAttribute("sessionUser");
		ResultCode res = new ResultCode();

		if ("admin".equals(user1.getUserName())) {
		if (userID == null) {
			// 参数不能为空
			res.setCode(1);
		}
		try {
			EntityWrapper<User> ew = new EntityWrapper<>();
			ew.eq("user_id", userID);
			userService.delete(ew);
			res.setCode(0);
		} catch (Exception e) {
			// TODO: handle exception
			res.setCode(1);
		}
		} else {
			res.setCode(1);
			res.setMsg("没有权限（admin用户可操作）");
		}
		return res;

	}
	
	/**
	 * 修改密码(只能修改自己的密码)
	 * 
	 * @author zhangxuewei
	 * @param userID
	 * @param password
	 * @param session
	 * @return
	 */
	@ResponseBody
	@RequestMapping(value = "/updateUserPWD", method = RequestMethod.POST)
	public ResultCode updateUserPWD(@RequestParam(value = "password_old") String password,
			@RequestParam(value = "password_new") String newpassword, HttpSession session) {
		logger.info("updateUserPWD ...........");
		User user1 = (User) session.getAttribute("sessionUser");
		ResultCode res = new ResultCode();
		EntityWrapper<User> ew = new EntityWrapper<>();
		ew.eq("user_name", user1.getUserName());
		User user2=  userService.selectOne(ew);
		if(user2.getPassWord().equals(AIAppUtils.encrypt(password))) {
			if (StringUtils.isNotBlank(password) && StringUtils.isNotBlank(newpassword)) {
				String setSql = "pass_word = " + "'" + AIAppUtils.encrypt(newpassword) + "'";
				EntityWrapper<User> ew1 = new EntityWrapper<>();

				ew.eq("user_id", user1.getUserID());

				try {
					userService.updateForSet(setSql, ew1);
					session.removeAttribute("sessionUser");
					res.setCode(0);
					
				} catch (Exception e) {
					// TODO: handle exception
					res.setCode(1);
				}
			} else {
				// 参数不能为空
				res.setCode(1);
				res.setMsg("参数不能为空");
			}

		}else {
			res.setCode(1);
			res.setMsg("原始密码不正确！");
		}
		
		return res;
	}

	/**
	 * 禁用用户
	 * 
	 * @author zhangxuewei
	 * @param userID
	 * @param status
	 * @param session
	 * @return
	 */
	// 禁用
	@ResponseBody
	@RequestMapping(value = "updateStatus", method = RequestMethod.POST)
	public ResultCode updateStatus(@RequestParam(value = "userID") Long userID,
			@RequestParam(value = "status") Long status, HttpSession session) {
		logger.info("updateStatus ...........");
		ResultCode res = new ResultCode();
		User user1 = (User) session.getAttribute("sessionUser");

		if (user1.getUserName().equals("admin")) {
			if (userID != null && status != null) {
				if (status == 0 || status == 1) {
					String setSql = "status = " + status;
					EntityWrapper<User> ew = new EntityWrapper<>();
					ew.eq("user_id", userID);
					try {
						userService.updateForSet(setSql, ew);
						res.setCode(0);
					} catch (Exception e) {
						// TODO: handle exception
						res.setCode(1);
					}
				} else {
					// status参数只能为 0（禁用） 1（启用）
					res.setCode(1);
					res.setMsg("参数不正确");
				}
			} else {
				// 参数不能为空
				res.setCode(1);
				res.setMsg("参数不能为空");
			}
		} else {
			res.setCode(1);
			res.setMsg("没有权限（admin用户可操作）");
		}
		return res;
	}

}

这个是单表分页 加工返回前台数据 的 方法

package cn.com.befery.dataai.controller;

import org.springframework.stereotype.Controller;

import com.baomidou.mybatisplus.plugins.Page;

import cn.com.befery.dataai.vo.ResponseData;

@Controller
public class BaseController {

    /**
     * 
     * @param draw 重构次数
     * @param page 分页数据
     * @return
     */
    public ResponseData responseData(String draw,Page<?> page){
    	ResponseData res = new ResponseData();
    	res.setData(page.getRecords());
    	res.setDraw(draw);
    	res.setRecordsFiltered((int)page.getTotal());
    	res.setRecordsTotal((int)page.getTotal());
    	return res;
    }
}

这个是ResponseDate类（省去了get set 方法）

package cn.com.befery.dataai.vo;

import java.util.List;

//@JsonInclude(Include.NON_NULL) 
public class ResponseData {
    
	/**
	 * 
	 */
//	private static final long serialVersionUID = 1L;
	
	private String draw;
	
	private int recordsTotal;
	
	private int recordsFiltered;
	
	@SuppressWarnings("rawtypes")
	private List data;
}