Discuss .get .post .ajax ztree and background servlet data transfer related knowledge

This article mainly introduces the relevant knowledge about .get .post .ajax ztree and background servlet transferring data. Friends who need it can refer to it

Servlet transfers data string to the front desk

The method used is

PrintWriter out = response.getWriter();
    // response.sendRedirect("test.jsp");
    String s = "[{'id':'1', 'pId':'0', 'name':'test1'},{'id':'11', 'pId':'1', 'name':'test11'}, {'id':'12', 'pId':'1', 'name':'test12'}, {'id':'111', 'pId':'11', 'name':'test111'},]";
    out.write(s);

---------------------

About .get .post .ajax The understanding is that

The last one is asynchronous, and the first two are synchronous (blocking)

.get(url，data，function(data，status){
执行的函数
//我理解的data和url参数的意思是一样的
})

------------------- ------

Usage of ztree:

Pay attention to the difference between the two json formats of ztree. The simple format is often used, directly passing the data The relationship between them shows the structure of the tree

The second one is achieved by absconding json

Note that the style and js files must be fully imported and then the location on the interface It is ul

and then

//注意的话是传递response传递回来的类型是string，这是string转换对象的方法
var ss = eval("(" + data + ")");
        var t = $("#test");
//然后是树控的初始化（位置，配置，数据）
        t = $.fn.zTree.init(t, setting, ss);
//取得树对象然后操作
var zTree = $.fn.zTree.getZTreeObj("test");

is collected and sorted, and the problem of transmitting the background data to the front desk is solved.

About

.get is replaced with

.ajax
 $("button").click(function(){
 $.get("demo_ajax_load.txt", function(result){
  $("p").html(result);
 });
});------------ $.ajax({ url: url, data: data, success: success, dataType: dataType });

ps: AJAX uses the POST method to transfer data to the background Servlet

<script type="text/javascript">
 //统计资源访问次数的脚本
 //定义XMLHttpRequest对象
 var http_request=false;
 function send_request(url,rewriteUrl){
   http_request=false;
   //开始初始化XMLHttpRequest对象
   if(window.XMLHttpRequest){//Mozilla等浏览器初始化XMLHttpRequest过程
     http_request=new XMLHttpRequest();
     //有些版本的Mozilla浏览器处理服务器返回的未包含XML mime-type头部信息的内容时会出错.
     //因此,要确保返回的内容包含text/xml信息.
     if(http_request.overrideMimeType){
       http_request.overrideMimeType("text/xml");
     }
   }
   else if(window.ActiveXObject){//IE浏览器初始化XMLHttpRequest过程
     try{
       http_request=new ActiveXObject("Msxml2.XMLHTTP");
     }
     catch(e){
       try{
         http_request=new ActiveXObject("Microsoft.XMLHTTP");
       }
       catch(e){}
     }
   }
   //异常,创建对象失败
   if(!http_request){
     window.alert("不能创建XMLHttpRequest对象实例!");
     return false;
   }
   //指定响应处理函数
   http_request.onreadystatechange=processRequest;
   //发送HTTP请求信息
   http_request.open("POST",url,true);
   http_request.setRequestHeader("Content-Type","application/x-www-form-urlencoded");
   //将参数放到这里，后台servlet可以用request.getParameter()方法取到这些参数
   http_request.send("rewriteUrl=" + rewriteUrl"&rewriteUrl2=" + rewriteUrl2);
 }
 //处理返回信息函数
 function processRequest(){
   //判断对象状态
   if(http_request.readyState==4){
     //判断HTTP状态码
     if(http_request.status==200){
       //信息已经成功返回，无动作
     }
     else {
       //请求页面有问题
       alert("您所请求的页面有异常!错误状态:"+http_request.status);
     }
   }
 }
 function dosearch(rewriteUrl){
  send_request("http://127.0.0.1:8000/); //这里的rewriteUrl就是页面上放置的资源经过重写后的链接
 }
//统计资源访问次数的JS——end
</script>

In addition, placing elements with rewritten addresses on the page requires calling the dosearch(rewriteUrl) method above , pass the rewritten link as a parameter to this method, for example:

<a href="http://127.0.0.1:8000/iras50/rewriter/CNKI/" target="_blank" onclick="dosearch(&#39;http://127.0.0.1:8000/iras50/rewriter/CNKI/&#39;);">中国知网</a>

The above is what I compiled for everyone, I hope it will be helpful to everyone in the future.

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How to solve the problem that error always pops up when ajax returns verification

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