Java read JSON array into list or object array

in previous development, it was often encountered to convert a list or array to JSON to the Web front end.

For front-end display, but today I encountered a need to pass the JSON array to the background, and after

The problem of converting the table into list. For this I spent a long time, so I wrote this blog.

The first is to construct the JSON array in the front end with JS, the HTML code is as follows:

<table style= "width:900px" id= "TABLE" ><pre name= "code" class= "HTML" > <tr id= "trhtml" ><td class= " Tdlabel "nowrap=" nowrap "><label><ju:txt value=" virtual account "/>:</label></td><td>< Input type= "text" id= "Payaccno" name= "Payaccno" vui-name= "Payaccno" style= "width:100px;" autocomplete= "Off"/>< /TD&GT;&LT;TD class= "Tdlabel" nowrap= "nowrap" ><label><ju:txt value= "account number"/>:</label></td ><td><input type= "text" id= "Glcode" name= "Glcode" vui-name= "Glcode" style= "width:100px;" autocomplete= " Off "/></td><td class=" Tdlabel "nowrap=" nowrap "><label><ju:txt value=" currency type "/><span Style= "color:red;" > *</span>:</label></td><td><select id= "ccy" name= "Ccy" class= "Ccy" style= "width:80px  ; text-align:center; " Vui-name= "Ccy" vui-validate= "Required:true" > </select><td/><td class= "Tdlabel" nowrap= "nowrap" ><label><ju:txt value= "Amount"/&Gt;<span style= "color:red;" > *</span>:</label></td><td><input type= "text" id= "Amount" name= "Amount" style= "width  : 80px; " Vui-name= "Amount" vui-validate= "Required:true,type:number"/> <td/><td class= "Tdlabel" nowrap= "nowrap" ><label><ju:txt value= "Summary"/><span style= "color:red;"  > *</span>:</label></td><td><textarea id= "Remark" name= "remark" style= "width:200px;" Vui-name= "Remark" vui-validate= "required:true,maxlen:20" > </textarea><td/><td style= " padding-left:35px; " ><td/><td style= "Padding-left : 15px; " ><td/> </tr></TABLE>

in the requirements of the need to dynamically add and delete content in the TR to add a line of input, for this there is the following JS code:

Bindings add addhtml= "<tr>" +$ ("#trHtml"). HTML () + "</tr>"; $ ("#handworkAccountForm"). Find ($ ("#create"). (function () {$ ("#create"). Die ("click"); $ ("#create"). Live ("Click", Function () {$ ("#table"). Append (addhtml); $ (". Ccy : Last "). html (modelshtml);   }); ////Bind Delete $ ("#handworkAccountForm"). Find ($ ("#delete")). each (function () {$ ("#delete"). Live ("Click", Function () {if ($ ( "#table tr"). Length==1) {return}$ (this). Parent (). Parent (). remove ();});});

where addhtml is the option item in select and is the load from the background with Ajax, ignored here.

Second, you need to use JS to get the input of a TR term, constructed into a JSON array, the code is as follows:

var savehandworkaccount = function () {var jsondata={"ResourceID": "2020004"};var handworkaccountlist=new Array;var Jsonstr= ""; $ ("#table tr TD Input,select,textarea"). each (function (i) {var name=$ (this). attr ("name"), Var value=$ (this) . val (); jsonstr=jsonstr+ "\" "+name+" \ ":" + "\" "+value+" \ "+", "if (i%4==0&i!=0) {jsonstr=" {"+jsonstr.substring (0 , jsonstr.length-1) + "}", Var A=jquery.parsejson (JSONSTR); Handworkaccountlist.push (a); Jsonstr= "";}}); jsondata["Handworkaccountlist"]=json.stringify (handworkaccountlist); $.vajax ({url: "Handworkaccountprocess.json" , Data:jsondata,datatype: "JSON", success:function (data) {if (data.errormsg) {alert (data.errormsg); return;} if (data.info) {alert (data.info); Location.reload ();} Else{alert ("Operation failed");}},error:function (JQXHR, Textstatus, error) {alert ("Load page failed! ");}});};

The JSON format is constructed as follows:

{"    handworkaccountlist": [        {            "payaccno": "122",            "Glcode": "333",            "Ccy": "CNY",            "Amount": " "Remark"            : "5555"        },        {            "payaccno": "5555", "Glcode": "            6666",            "Ccy": "CNY",            " Amount ":" 888 "        }    ],    " ResourceID ": 2020004}

Finally, the background gets the code as follows:

public void        Addhandworkaccount (Context context) {Logger.debug ("Start addhandworkaccount ...");        map<string, object> request = This.getrequestdata ();        map<string, object> response = This.getresponsedata ();        Object handworkaccountlist = Request.get ("Handworkaccountlist");        String json = handworkaccountlist.tostring ();        Jsonarray array = jsonarray.fromobject (JSON);        List
Where list
Is the data transfer object used to encapsulate the parameters passed by the front end, with the following code:
public class Handworkaccountdto implements Serializable {    protected String payaccno;    protected String Glcode;    protected String ccy;    protected BigDecimal amount;    protected String remark;    //.... Omit Get,set Method}

at this point, Java reads the case of a JSON array into a list or an object array. 




Java read JSON array into list or object array