Merge branch 'master' of https://github.com/JonCook/tutorials

ethereum/src/main/java/com/baeldung/web3j/Template.java

@@ -0,0 +1,41 @@
+package com.baeldung.web3j;
+
+import com.baeldung.web3j.contracts.Greeting;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.web3j.crypto.Credentials;
+import org.web3j.crypto.WalletUtils;
+import org.web3j.protocol.Web3j;
+import org.web3j.protocol.core.methods.response.TransactionReceipt;
+import org.web3j.protocol.http.HttpService;
+import org.web3j.tx.Contract;
+import org.web3j.tx.ManagedTransaction;
+
+public class Template {
+
+    private Logger l = LoggerFactory.getLogger(Template.class);
+
+    private void deployContract() throws Exception{
+
+        Web3j web3j = Web3j.build(new HttpService("https://rinkeby.infura.io/<your_token>"));
+
+        Credentials credentials =
+            WalletUtils.loadCredentials(
+               "<password>",
+               "/path/to/<walletfile>");
+
+        Greeting contract = Greeting.deploy(
+            web3j, credentials,
+            ManagedTransaction.GAS_PRICE, Contract.GAS_LIMIT,
+            "Hello blockchain world!").send();
+
+        String contractAddress = contract.getContractAddress();
+        l.debug("Smart contract deployed to address "+ contractAddress);
+
+        l.debug("Value stored in remote smart contract: "+ contract.greet().send());
+
+        TransactionReceipt transactionReceipt = contract.setGreeting("Well hello again").send();
+
+        l.debug("New value stored in remote smart contract: "+ contract.greet().send());
+    }
+}