1、前台AJAX请求，后台以对象转JSON形式返回：
后台代码：
@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("发送盘点指令，设备号是："+devCode+",盘点指定卡盘：为指定；");
Map map=new HashMap();
try {
//。。。。。。逻辑代码省略。。。。。。。。。。。。。
return new Result(true, ResultCodeEnum.SUCCESS.getRetCode(),ResultCodeEnum.SUCCESS.getRetMsg(),list);
}
} catch (Exception e) {
log.info("加卡指令发送失败"+e.getMessage());
e.printStackTrace();
return new Result(false, ResultCodeEnum.CONNECT_ERROR.getRetCode(),ResultCodeEnum.CONNECT_ERROR.getRetMsg());
}
return new Result(f);
}
其中Result是我们自己的一个java类：
public class Result {
private boolean success;
private String retCode ;
private String retMsg;
private Object data;
private String message;
private String code;
}
前台接受及加工情况：
ajaxPost(basePath+"/api/deviceController/queryDist?devCode="+devCode,null,function(data){
if(data.retCode=='00'){
modals.correct("指令发送成功,数据盘点中，请稍后...");
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){//实际盘库有卡但是数据库记录无卡
$("#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])+"数据不匹配：数据库记录无卡，实际盘库结果有卡</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]+"数据不匹配：数据库记录有卡，实际盘库结果无卡</div>\n")
}
}
}else{
modals.error("指令发送失败，连接设备失败");
}
});
2、后台返回的List里面装对象然后转为json：
后台代码：
public List<Comments> findCommentsByMessageId(HttpServletRequest request, HttpServletResponse response,int msgId){
List<Comments> list= service.findCommentsByMessageId(msgId);
//将列表转成json字符串
JSONArray json=JSONArray.fromObject(list);
String jsonString=json.toString();
//将json字符串返回给前台
try {
PrintWriter out =response.getWriter();
out.write(jsonString);
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
注意：上面的代码执行的前提是目标对象也就是上面的Comments类需要“toString”：
@Override
public String toString() {
return "Comments [commentsId=" + commentsId + ", messageId="
+ messageId + ", messageUserId=" + messageUserId
+ ", commentsUserId=" + commentsUserId + ", commentwords="
+ commentwords + ", publishtime=" + publishtime
+ ", headimgname=" + headimgname + ", nickname=" + nickname
+ "]";
}
前台解析代码：
其他情况待总结