1:概述

过去 我们在每一个方法中处理前端发过来的请求,需要自己构造请求数据,然后通过spring 提供的@ResponseBody 强制转为JSON数据吗,实际上出现了很多重复的代码,我么亦可以通过构造一个

工具类,实现只关注需要改变的数据. 下面给出这个工具类.

 

 

public class JsonMsg {

    private int code;
    private String msg;
    private Map<String, Object> extendInfo = new HashMap<>();

    public int getCode() {
        return code;
    }

    public void setCode(int code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

    public Map<String, Object> getExtendInfo() {
        return extendInfo;
    }

    public void setExtendInfo(Map<String, Object> extendInfo) {
        this.extendInfo = extendInfo;
    }

    public static JsonMsg success(){
        JsonMsg res = new JsonMsg();
        res.setCode(100);
        res.setMsg("操作成功！");
        return res;
    }

    public static JsonMsg fail(){
        JsonMsg res = new JsonMsg();
        res.setCode(200);
        res.setMsg("操作失败！");
        return res;
    }

    public JsonMsg addInfo(String key, Object obj){
        this.extendInfo.put(key, obj);
        return this;
    }

}

 

 

下面我给出具体的使用示例:

　　　　就是一个普通的CRUD代码

 

package com.hrms.controller;

import com.hrms.bean.Department;
import com.hrms.service.DepartmentService;
import com.hrms.util.JsonMsg;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;

import java.util.List;

/**
 * @author GenshenWang.nomico
 * @date 2018/3/8.
 */
@Controller
@RequestMapping(value = "/hrms/dept")
public class DepartmentController {

    @Autowired
    DepartmentService departmentService;

    /**
     * 删除
     * @param deptId
     * @return
     */
    @RequestMapping(value = "/delDept/{deptId}", method = RequestMethod.DELETE)
    @ResponseBody
    public JsonMsg deleteDept(@PathVariable("deptId") Integer deptId){
        int res = 0;
        if (deptId > 0){
            res = departmentService.deleteDeptById(deptId);
        }
        if (res != 1){
            return JsonMsg.fail().addInfo("del_dept_error", "删除异常");
        }
        return JsonMsg.success();
    }

    /**
     * 部门更改
     * @param deptId
     * @param department
     * @return
     */
    @RequestMapping(value = "/updateDept/{deptId}", method = RequestMethod.PUT)
    @ResponseBody
    public JsonMsg updateDeptById(@PathVariable("deptId") Integer deptId, Department department){

        int res = 0;
        if (deptId > 0){
            res = departmentService.updateDeptById(deptId, department);
        }
        if (res != 1){
            return JsonMsg.fail().addInfo("update_dept_error", "部门更新失败");
        }
        return JsonMsg.success();
    }

    /**
     * 新增部门
     * @param department
     * @return
     */
    @RequestMapping(value = "/addDept", method = RequestMethod.PUT)
    @ResponseBody
    public JsonMsg addDept(Department department){
        int res = departmentService.addDept(department);
        if (res != 1){
            return JsonMsg.fail().addInfo("add_dept_error", "添加异常！");
        }
        return JsonMsg.success();
    }

    /**
     * 查询部门信息总页码数
     * @return
     */
    @RequestMapping(value = "/getTotalPages", method = RequestMethod.GET)
    @ResponseBody
    public JsonMsg getTotalPages(){

        //每页显示的记录行数
        int limit = 5;
        //总记录数
        int totalItems = departmentService.getDeptCount();
        int temp = totalItems / limit;
        int totalPages = (totalItems % limit== 0) ? temp : temp+1;

        return JsonMsg.success().addInfo("totalPages", totalPages);
    }

    /**
     *
     */

    @RequestMapping(value = "/getDeptById/{deptId}", method = RequestMethod.GET)
    @ResponseBody
    public JsonMsg getDeptById(@PathVariable("deptId") Integer deptId){
        Department department = null;
        if (deptId > 0){
            department = departmentService.getDeptById(deptId);
        }
        if (department != null){
            return JsonMsg.success().addInfo("department", department);
        }
        return JsonMsg.fail().addInfo("get_dept_error", "无部门信息");
    }

    /**
     * 分页查询：返回指定页数对应的数据
     * @param pageNo
     * @return
     */
    @RequestMapping(value = "/getDeptList", method = RequestMethod.GET)
    public ModelAndView getDeptList(@RequestParam(value = "pageNo", defaultValue = "1") Integer pageNo){
        ModelAndView mv = new ModelAndView("departmentPage");
        //每页显示的记录行数
        int limit = 5;
        //总记录数
        int totalItems = departmentService.getDeptCount();
        int temp = totalItems / limit;
        int totalPages = (totalItems % limit== 0) ? temp : temp+1;
        //每页的起始行(offset+1)数据，如第一页(offset=0，从第1(offset+1)行数据开始)
        int offset = (pageNo - 1)*limit;
        List<Department> departments = departmentService.getDeptList(offset, limit);

        mv.addObject("departments", departments)
                .addObject("totalItems", totalItems)
                .addObject("totalPages", totalPages)
                .addObject("curPageNo", pageNo);
        return mv;
    }

    /**
     * 查询所有部门名称
     * @return
     */
    @RequestMapping(value = "/getDeptName", method = RequestMethod.GET)
    @ResponseBody
    public JsonMsg getDeptName(){
        List<Department> departmentList = departmentService.getDeptName();
        if (departmentList != null){
            return JsonMsg.success().addInfo("departmentList", departmentList);
        }
        return JsonMsg.fail();
    }


}