Spring Boot 项目维护全局json数据

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 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 getExtendInfo() { return extendInfo; } public void setExtendInfo(Map 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 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 departmentList = departmentService.getDeptName(); if (departmentList != null){ return JsonMsg.success().addInfo("departmentList", departmentList); } return JsonMsg.fail(); }}

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