The simple operation of Jackson and Ajax

Server serialization and deserialization

One, serialization

    /**     * Serialized as JSON     *    /public static string ToJson (Object obj) {        string result = null;        try {            //object mapper            objectmapper objectmapper = new Objectmapper ();            Set Date format            simpledateformat sdf = new SimpleDateFormat ("yyyy mm DD HH:mm:ss");            Objectmapper.setdateformat (SDF);            result = objectmapper.writevalueasstring (obj);        } catch (Jsonprocessingexception e) {            e.printstacktrace ();        }        return result;    }

Two, deserialization

/**     * Deserializes into objects     *     * T: Indicates that all types are different from Objcet. Generic strongly typed object is weakly type     * JSON: String that needs to be deserialized     * ValueType: deserialized type     * */     < T > T toobject (String json,class<T>  valueType) {        //object Mapper        Objectmapper mapper=new objectmapper ();        T Result=null;        try {            result=mapper.readvalue (json,valuetype);        } catch (Exception e) {            e.printstacktrace ();        }        return result;    }

third, the problem of time when serializing

Time through the Jackson serialization is a problem, it will convert the time to 1977 to the present time of the number of milliseconds, the following to solve the problem

1, Time annotation @jsonformat: Insert a time annotation before the time field that requires the specified serialized object, changing to the format you want

　　

    Private String Comid;    Private String comname;    Private String Comprice;    Set Date format
/**
*locale: Country
*timezone: Time zone
*pattern: Time Format
*    /@JsonFormat (locale= "zh", timezone= "gmt+8", pattern= "Yyyy-mm-dd HH:mm:ss")    private String comtime;    Private String yn;

2,simpledateformat: Set the time format before serializing

            Object Mapper            objectmapper objectmapper = new Objectmapper ();            Set Date format            simpledateformat sdf = new SimpleDateFormat ("yyyy mm DD HH:mm:ss");            Objectmapper.setdateformat (SDF);            Objectmapper.writevalueasstring (obj);

Jackson Toolkit:

Https://files.cnblogs.com/files/NiuBiHH/jackson.zip

four, native Ajax

Get XHR Object

  　　 /** * Get XHR Object **/function getxhr () {//window. XMLHttpRequest objects that are almost always available in a common browser        if(window. XMLHttpRequest) {return NewXMLHttpRequest (); }Else  if(window. ActiveXObject) {//ActiveXObject ("Microsoft.XMLHTTP") is a Xhr object obtained by Microsoft Corporation under IE6 IE5            return NewActiveXObject ("Microsoft.XMLHTTP"); }        return NULL; }

Functions that are called when the state changes

      /*
*xhr.readystate equals 4 Indicates the request was successful
*xhr.status equals 200 indicates server response status is successful
*xhr.responsetext Remove the value returned by the server response
*/

  xhr.onreadystatechange=function () {            if(xhr.readystate==4) {                 if( xhr.status==                 xhr.responsetext;
　　　　　　　　　　                }            }        }

Open () If it is local, you can use Openreques () instead

/*
*  method request type such as: Get post
*  
* ASYCN is an asynchronous request by default is True
*/

void  Open (   domstring method,   domstring URL,   async,);

All related events requested by send () must precede this method

Xhr.send (null

Case:

    /** * Get XHR Object **/function getxhr () {//window. XMLHttpRequest objects that are almost always available in a common browser        if(window. XMLHttpRequest) {return NewXMLHttpRequest (); }Else  if(window. ActiveXObject) {//ActiveXObject ("Microsoft.XMLHTTP") is a Xhr object obtained by Microsoft Corporation under IE6 IE5            return NewActiveXObject ("Microsoft.XMLHTTP"); }        return NULL; } function Gettime_click () {varXhr=getxhr (); //events when the state changesXhr.onreadystatechange=function () {if(xhr.readystate==4){//Request succeeded                if(xhr.status== $){//Server response status succeeded//display data from the server on the pagealert (xhr.responsetext); }            }        }        //Open RequestXhr.open ("GET","Commoditycontrol?action=time",true);//request type, path, whether it is an asynchronous request//Send RequestXhr.send (NULL);//Parameters}

Five, $.ajax (options)

$.ajax Parameter Description

Property	Type	Describe
wr.	String	The requested URL
Type	String	Requested method such as: Get () POST () default get ()
Data	Object	Parameters with past when requesting background
DataType	String	Sets the type of data returned by the server, such as: XML HTTP JSON SCRIPT TEXT
Timeout	Numerical	Set the request time to abort the request and invoke the error function if it exceeds the change time
Global	Boolean value	Enable or disable triggering of the complete function
ContentType	String	The requested content type
Success	Function	Called when a request succeeds, the first parameter of the function is the server's response value
Error	Function	The request response indicates an error status code, with three arguments called the function: Request object, status message string, exception object
Complete	Function	The request response indicates the success status code, called the function, and if the success or error callback function is specified, the function is called after they are called
Beforesend	Function	Functions called before initiating a request
Async	Boolean value	Specifies whether the request is asynchronous

Case:

$.ajax ({type: "get",//Request type URL: "Commoditycontrol?action=allcom", Path Beforesend:function () {//Pre-request event C.S                how ();  }, Success:function (data) {//Event $.each after successful request (data, function (index, obj) {var tr = $ ("<TR/>"); var inptd = $ ("<TD/>"); $("<inputname= ' ComCheck 'class= ' ComCheck 'type= ' checkbox '/>"). HTML (obj.comtime). AppendTo (INPTD). Data (" id ", obj.comid);                        Inptd.appendto (TR); $("<TD/>"). HTML (obj.comid). AppendTo (TR); $("<TD/>"). HTML (obj.comname). AppendTo (TR); $("<TD/>"). HTML (obj.comprice). AppendTo (TR); $("<TD/>"). HTML (obj.comtime). AppendTo (TR); var Inputtd = $ ("<TD/>"); if (Obj.yn = = ' Y ') {$ ("<inputname= ' yn 'checked= ' 'value= ' Y 'type= ' checkbox '/>"). HTML (obj.comtime). AppendTo (INPUTTD); } else {$ ("<inputname= ' yn 'type= ' checkbox '/>"). HTML (obj.comtime). AppendTo (INPUTTD);                        } inputtd.appendto (TR); var ATD = $ ("<TD/>"); $("<ahref= ' # ' class= ' aupdate '></a>"). HTML (" verbose "). AppendTo (ATD). Data (" id ", obj.comid); $("<ahref= ' # 'class= ' Adel '></a>"). html (" delete "). AppendTo (ATD). Data (" id ", obj.comid);                        Atd.appendto (TR);                        $ ("#com"). Append (tr);                    C.close ();                });                }, Complete:function () {//the event at the completion of the request, regardless of success or failure $ ("#hint"). HTML ("request complete ..."); }, Error:function (XHR, Textstatus, Errorthrown) {//Error alert (XHR + Textstatus + E                Rrorthrown); }            });

The simple operation of Jackson and Ajax