后台以json數據形式返回之后前台接受的方法以及之后的解析總結

1、前台AJAX請求，后台以對象轉JSON形式返回：

后台代碼：

 @RequestMapping(value = "/queryDist", method = RequestMethod.POST)
    @ResponseBody
    public Result queryDist(HttpServletRequest request) {
        Boolean f = false;
        String devCode = request.getParameter("devCode");
        Subject subject = SecurityUtils.getSubject();
        String userId = (String) subject.getPrincipal();
        User user = userService.getUserById(userId);
        log.info("發送盤點指令，設備號是："+devCode+",盤點指定卡盤：為指定；");
        Map map=new HashMap();

        try {
           //。。。。。。邏輯代碼省略。。。。。。。。。。。。。
                return new Result(true, ResultCodeEnum.SUCCESS.getRetCode(),ResultCodeEnum.SUCCESS.getRetMsg(),list);
            }
        } catch (Exception e) {
            log.info("加卡指令發送失敗"+e.getMessage());
            e.printStackTrace();
            return new Result(false, ResultCodeEnum.CONNECT_ERROR.getRetCode(),ResultCodeEnum.CONNECT_ERROR.getRetMsg());
        }
        return new Result(f);
    }

其中Result是我們自己的一個java類：

public class Result {
    private boolean success;
    private String retCode ;
    private String retMsg;
    private Object data;
    private String message;
    private String code;
}

前台接受及加工情況：

                        ajaxPost(basePath+"/api/deviceController/queryDist?devCode="+devCode,null,function(data){
                            if(data.retCode=='00'){
                                modals.correct("指令發送成功,數據盤點中，請稍后...");
                                console.log(data.data)
                                var nums=data.data;
                                console.log(nums.length)
                                for (var i=0;i<nums.length;i++){
                                    if (nums[i].indexOf("-")==0){//實際盤庫有卡但是數據庫記錄無卡
                                        $("#showResult").append("<div class=\"eachMassage\" style=\"padding-left:10px;padding-left:10px;width: 90%;height: 25px;line-height: 25px;margin: 5px auto;background-color: rgba(0,0,255,0.3);text-align: left;border-radius: 3px;color: white;\">卡槽"+(0-nums[i])+"數據不匹配：數據庫記錄無卡，實際盤庫結果有卡</div>\n")
                                    } else {
                                        $("#showResult").append("<div class=\"eachMassage\" style=\"padding-left:10px;padding-left:10px;width: 90%;height: 25px;line-height: 25px;margin: 5px auto;background-color:rgba(0,255,0,0.3);text-align: left;border-radius: 3px;color: white;\">卡槽"+nums[i]+"數據不匹配：數據庫記錄有卡，實際盤庫結果無卡</div>\n")
                                    }
                                }
                            }else{
                                modals.error("指令發送失敗，連接設備失敗");
                            }
                        });

2、后台返回的List里面裝對象然后轉為json：

后台代碼：

public List<Comments> findCommentsByMessageId(HttpServletRequest request, HttpServletResponse response,int msgId){
        List<Comments> list= service.findCommentsByMessageId(msgId);
        //將列表轉成json字符串
        JSONArray json=JSONArray.fromObject(list);
        String jsonString=json.toString();
        //將json字符串返回給前台
        try {
            PrintWriter out =response.getWriter();
            out.write(jsonString);
            out.flush();
            out.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

注意：上面的代碼執行的前提是目標對象也就是上面的Comments類需要“toString”：

 

@Override
    public String toString() {
        return "Comments [commentsId=" + commentsId + ", messageId="
                + messageId + ", messageUserId=" + messageUserId
                + ", commentsUserId=" + commentsUserId + ", commentwords="
                + commentwords + ", publishtime=" + publishtime
                + ", headimgname=" + headimgname + ", nickname=" + nickname
                + "]";
    }

 

前台解析代碼：

其他情況待總結