前几天遇到这个RESTful风格，那就记录一下吧！

RESTful（表现层状态转化）风格

Http动词（CRUD）：

• GET（SELECT）：从服务器上查询资源

/**
     * 根据id查询员工信息
     * @param empId
     * @return
     */
    @RequestMapping(value = "/getEmpById/{empId}", method = RequestMethod.GET)
    @ResponseBody
    public JsonMsg getEmpById(@PathVariable("empId") Integer empId){
        Employee employee = employeeService.getEmpById(empId);
        if (employee != null){
            return JsonMsg.success().addInfo("employee", employee);
        }else {
            return JsonMsg.fail();
        }

    }

• POST（CREATE）：从服务器上新建资源

     * 新增员工
     * @param employee 新增的员工信息
     * @return
     */
    @RequestMapping(value = "/addEmp", method = RequestMethod.POST)
    @ResponseBody
    public JsonMsg addEmp(Employee employee){
        int res = employeeService.addEmp(employee);
        if (res == 1){
            return JsonMsg.success();
        }else {
            return JsonMsg.fail();
        }
    }

• PUT（UPDATE）：从服务器上更新资源

     * 更改员工信息
     * @param empId
     * @param employee
     * @return
     */
    @RequestMapping(value ="/updateEmp/{empId}", method = RequestMethod.PUT)
    @ResponseBody
    public JsonMsg updateEmp(@PathVariable("empId") Integer empId,  Employee employee){
        int res = employeeService.updateEmpById(empId, employee);
        if (res != 1){
            return JsonMsg.fail().addInfo("emp_update_error", "更改异常");
        }
        return JsonMsg.success();
    }

• DELETE（DELETE）：从服务器上删除资源

     * 员工删除操作
     * @param empId
     * @return
     */
    @RequestMapping(value = "/deleteEmp/{empId}", method = RequestMethod.DELETE)
    @ResponseBody
    public JsonMsg deleteEmp(@PathVariable("empId") Integer empId){
        int res = 0;
        if (empId > 0){
            res = employeeService.deleteEmpById(empId);
        }
        if (res != 1){
            return JsonMsg.fail().addInfo("emp_del_error", "员工删除异常");
        }
        return JsonMsg.success();
    }

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