How to make array of array objects in javascript and then pass it to java

Question

To illustrate my point: I have Name Age and Address of 4 people

[Sam, 23, nj],
[Nome, 25, ny],
[Sim, 20, pa],
[Jack, 12, pa]

I need to send these 4 rows to the java side.

I am familiar with java side coding so I can retrieve 4 rows from a list etc etc. I am new to javascripts, so I was wondering how to put all this data into a variable and then send it to java, so that java understands i am sending 4 sets of data.

I wanted to do hashmap of objects, either way as I am a newbie i don't know which road to take.pls advice.

I know how to post data through ajax, only part i am struggling with is creating the arrAY so my java side can parse it.

The answer is in the question tags: use JSON to transform your JS array of arrays into a String. Then use JSON in Java to transform the string into an array of arrays. — JB Nizet
– JB Nizet, Commented Jul 30, 2012 at 21:16

score 1 · Accepted Answer · 2012-07-31 20:50:18Z

1

Java supports JSON objects: http://www.json.org/java/ Use these methods.

Convert the array format to a stored variable and use the stringify method.

var a = Array([Sam, 23, nj], [Nome, 25, ny], [Sim, 20, pa], [Jack, 12, pa]);
var jsonText = JSON.stringify(a);
//send jsonText to java via post after this

Edit

To answer below, my Java is rusty from disuse but you will need to use the libraries here https://github.com/douglascrockford/JSON-java, and send the client side data jsonText over post data:

<form method='post' action='/Source/jsp/X.jsp' id='jsonform'>
<input id='json' name='json' value=''>
</form>

Then run a script to fill the value of the input with jsonText and submit it.

Once that is done you can grab the POST data and deserialize it and use it in your Java program.

var input = document.getElementById('json');
var form = document.getElementById('jsonform');
input.value = jsonText;
form.submit();

For the Java part, you said you are familiar with it so I'll leave that bit to you.

edited Jul 31, 2012 at 20:50

answered Jul 30, 2012 at 21:23

user1521604

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2 Comments

Haran Murthy Over a year ago

@Wolfe- Any lib to be added to parse this on the javaside?

Haran Murthy Over a year ago

How do I post the jsonText to a servlet class. say my jsp is in folder /Source/jsp/X.jsp and the servlet is in /Source/java/Y.java

Justin Ethier · Accepted Answer · 2012-07-30 21:16:50Z

1

You could serialize it to JSON so it looks something like this:

[{name: "Sam", age: 23, address: "nj"}, 
 {name: "Nome", age: 25, address: "ny"}]

answered Jul 30, 2012 at 21:16

Justin Ethier

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3 Comments

Haran Murthy Over a year ago

@Justin-How about the java side, Do I need to add additional plugins to 1. identify the array of objects. 2. identify what the key is and the value

Justin Ethier Over a year ago

I suggest you use a JSON library on the Java side to deserialize your data. There is a list of libraries on json.org if you need to find one.

Haran Murthy Over a year ago

@Justin-I got the json string. How do I post the jsonstring "jsonText" to a servlet class. say my jsp is in folder /Source/jsp/X.jsp and the servlet is in /Source/java/Y.java

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