2.4.1、controller、service层

DepartmentController：

package com.wzy.controller;
import com.github.pagehelper.PageInfo;
import com.wzy.pojo.Department;
import com.wzy.pojo.Msg;
import com.wzy.service.DepartmentService;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.List;
@Controller
public class DepartmentController {
    private DepartmentService departmentService;
    @ResponseBody//使用jackson依赖后，可以将返回值，自动转为json
    @RequestMapping(value = "/departement")
    public Msg getDepart(){
        List<Department> departments = departmentService.getDepartment();
        /**
         * 使用pageInfo 包装查询到的信息，只需要将 使用pageInfo 交给 跳转输出页面
         * 封装了详细的分页信息。包括我们查询出来的数据
         * 第一个参数是封装查询到的结果，第二个参数是要连续显示的页数
         */
        PageInfo pageInfo = new PageInfo(departments);
        //返回 pageInfo 的json
        return Msg.success().add("pageInfo",pageInfo);
    }
}

DepartmentService：

package com.wzy.service;
import com.wzy.dao.DepartmentMapper;
import com.wzy.pojo.Department;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class DepartmentService {
    @Autowired
    DepartmentMapper departmentMapper;
    public List<Department> getDepartment(){
        //按条件查询，参数为 null 查询所有。
        List<Department> departments = departmentMapper.selectByExample(null);
        return departments;
    }
}