ethereum contract example in java

ethereum-webapp.js

IP = "10.113.63.183";
ETHEREUM_ACCOUNT_NUMBER = 0;

/* static contract info */
CONTRACT_ADDRESS = '0x1d4B7B3386AD2f221C641f6EED3bb7D3f6d8eDCB';
CONTRACT_ABI = JSON.parse('[{"constant":false,"inputs":[],"name":"kill","outputs":[],"type":"function"},{"constant":false,"inputs":[],"name":"changeMsg","outputs":[],"type":"function"},{"constant":true,"inputs":[],"name":"greet","outputs":[{"name":"","type":"string"}],"type":"function"},{"inputs":[{"name":"_greeting","type":"string"}],"type":"constructor"}]');

$(document).ready(function () {

	if (typeof web3 === 'undefined') {
	    web3 = new Web3(new Web3.providers.HttpProvider('http://' + IP + ':8545'));
	}
	
	if (web3.isConnected()) {
		console.log(
			'Connected to Ethereum'
			+ '\nEthereum js api version: ' + web3.version.api
			+ '\nClient/node version: ' + web3.version.node
			+ '\nNetwork protocol version: ' + web3.version.network
			+ '\nEthereum protocol version: ' + web3.version.ethereum
			+ '\nAccount: ' + web3.eth.accounts[ETHEREUM_ACCOUNT_NUMBER]
			+ '\nBalance: ' + (web3.toWei(web3.eth.accounts[ETHEREUM_ACCOUNT_NUMBER], "ether") / web3.toWei(1, 'ether') + ' ether')
		);
	}
    
    contract = web3.eth.contract(CONTRACT_ABI);
    contractInstance = contract.at(CONTRACT_ADDRESS);
    console.log(contractInstance.greet());
});