Data exchange between JSON and Java objects

// Www.json.com/google-gson-2.1jar is recommended.

Package com. Jason. servlet;

Import java. util. arraylist;
Import java. util. hashmap;
Import java. util. iterator;
Import java. util. List;
Import java. util. Map;
Import java. util. Map. entry;
Import java. util. Set;

Import com. Google. gson. gson;
Import com. Google. gson. jsonelement;
Import com. Google. gson. jsonobject;
Import com. Google. gson. jsonparser;

Public class testdemo
{
Public static void main (string [] ARGs)
{
String STR = "{\" device sales process \ ": \" koId-001 \ ", \" consumables sales process \ ": \" koId-002 \"}";
Jsonparser JP = new jsonparser ();
Jsonelement je = JP. parse (STR); // parse the Jason string in Java
Jsonobject Jo = je. getasjsonobject ();
Set <entry <string, jsonelement> set = Jo. entryset ();
For (iterator <entry <string, jsonelement> iter = set. iterator (); ITER
. Hasnext ();)
{
Entry <string, jsonelement> E = ITER. Next ();
System. Out. println (E. getkey () + "," + E. getvalue ());
}
Gson = new gson ();
// Operate Java objects

Worktodo W1 = new worktodo ();
W1.setid ("process ID-001 ");
W1.getitemmap (). Put ("job ID-001", "Start ");
W1.getitemmap (). Put ("job ID-002", "end ");

Worktodo W2 = new worktodo ();
W2.setid ("process ID-002 ");
W2.getitemmap (). Put ("job ID-001", "Start ");
W2.getitemmap (). Put ("job ID-002", "end ");

PROCESS p = new process ();
P. setproname ("device sales process ");
P. setkoid ("koId-001 ");
List <worktodo> Ws = new arraylist <worktodo> ();
WS. Add (W1 );
WS. Add (W2 );
P. setworktodolist (WS );
Int COUNT = 0;
For (worktodo W: WS)
{
Count + = W. getcount ();
}
P. setcount (count );

System. Out. println (gson. tojson (p ));
}
}

Class Process
{
Private string proname;
Private string koid;
Private int count;
Private list <worktodo> worktodolist = new arraylist <worktodo> ();

Public process ()
{

}

Public process (string koid, list <worktodo> worktodolist)
{
This. koid = koid;
This. worktodolist = worktodolist;
}

Public String getkoid ()
{
Return koid;
}

Public void setkoid (string koid)
{
This. koid = koid;
}

Public list <worktodo> getworktodolist ()
{
Return worktodolist;
}

Public void setworktodolist (list <worktodo> worktodolist)
{
This. worktodolist = worktodolist;
}

Public int getcount ()
{
Return count;
}

Public void setcount (INT count)
{
This. Count = count;
}

Public String getproname ()
{
Return proname;
}

Public void setproname (string proname)
{
This. proname = proname;
}

}

Class worktodo
{
Private string ID;
Private Map <string, string> itemmap = new hashmap <string, string> ();

Public worktodo ()
{
}

Public String GETID ()
{
Return ID;
}

Public void setid (string ID)
{
This. ID = ID;
}

Public Map <string, string> getitemmap ()
{
Return itemmap;
}

Public void setitemmap (Map <string, string> itemmap)
{
This. itemmap = itemmap;
}

Public int getcount ()
{
Return this. itemmap. Size ();
}

}

Output: device sales process, "koId-001"
Consumables sales process, "koId-002"
{"Proname": "device sales process", "koid": "koId-001", "Count": 4, "worktodolist": [{"ID ": "process ID-001", "itemmap": {"job ID-002": "end", "job ID-001": "Start "}}, {"ID": "process ID-002", "itemmap": {"job ID-002": "end", "job ID-001 ": "Start" }}]}

// Ajax Data Transmission

VaR XMLHttpRequest;
Function ajaxtest ()
{
If (window. activexobject)
XMLHttpRequest = new activexobject ("Microsoft. XMLHTTP ");
// XMLHttpRequest = new activexobject ("msxml2.xmlhttp"); // suitable for new ie versions, but the above can also be used
Else if (window. XMLHttpRequest)
XMLHttpRequest = new XMLHttpRequest ();

If (XMLHttpRequest! = "Undefined ")
// If ("undefined "! = XMLHttpRequest) // do not recommend this method. It may be incorrect in IE.
{
// Prepare data, GET request; url = ajaxservlet; true indicates asynchronous Processing
VaR url = "$ {pagecontext. Request. contextpath}/ajaxservlet ";
// Submit the request in get mode, with parameters following the URL
/* XMLHttpRequest. Open ("get", URL, true );
XMLHttpRequest. onreadystatechange = ajaxcallback; // callback function
XMLHttpRequest. Send (null); // send the request
*/
// Submit in post Mode

XMLHttpRequest. Open ("Post", URL, true );
XMLHttpRequest. onreadystatechange = ajaxcallback; // callback function
VaR JSON = {"001": "A", "002": "B "};
XMLHttpRequest. setRequestHeader ("Content-Type", "application/X-WWW-form-urlencoded"); // you must add
XMLHttpRequest. Send ("JSON =" + JSON. stringify (JSON); // send a request
}

}

Function ajaxcallback ()
{
If (XMLHttpRequest. readystate = 4)
{
If (XMLHttpRequest. Status = 200)
{
VaR JSON = eval ('+ XMLHttpRequest. responsetext + ')');
For (var I in JSON)
{
Alert (I + "," + JSON [I]);
}
}
}
}