COMP REST Programming in Eclipse

Transcription

1 COMP 4601 REST Programming in Eclipse 1

2 The Context Need to understand how to pass objects between a client and server. Using JAXB In the following slides, code is taken from the COMP4601SecondBank and COMP4601SecondBankClient projects. 2

3 The Account Class package edu.carleton.comp4601.bank.model; import public class Account { Integer id; Integer balance; String descripqon; XmlRootElement makes class serializable 3

4 The Accounts Class The Accounts class is a container for Account instances. It needs to be serializable public class Accounts { sta;c String DIR = "/Users/tonywhite/Desktop/Accounts/"; sta;c boolean TESTING = false; Note: You need the Account class on both the client and server sides of the applica;on. Also, create gejers and sejers for serializable classes. 4

5 GeVng all of the accounts Line 71 public List<Account> getaccounts() { List<Account> loa = new ArrayList<Account>(); loa.addall(accounts.getinstance().getmodel().values()); return loa; Because Accounts is serializable, loa will be returned as an XML document. 5

6 Accessing a specific bank account Line 99 of Bank.java. // hep://localhost:8080/comp4601secondbank/rest/bank/42 // Using above, acct will be given the value {acct ) public Ac;on getaccount(@pathparam("acct") String id) { return new Ac;on(uriInfo, request, id); NOTE uriinfo and request, declared on lines 28 and 29 allow the original request info to be used in a method call. 6

7 Line 80 of Bank.java CreaQng a @Consumes(MediaType.APPLICATION_FORM_URLENCODED) public void newaccount(@formparam("id") String String String HepServletResponse servletresponse) throws IOExcep;on { to get named parameters from the form used to create object on client side. 7

8 The client Need to set up a WebResource object. See lines of BankClient3.java. Client is simple command line driven applicaqon. See process( ) on line 64. 8

9 CreaQng an account using a form on the client side Line 142 of BankClient3.java else if (cmd.equalsignorecase("auto")) { Form form = new Form(); Random r = new Random(); int id = r.nextint(1000); int balance = r.nextint(1000); form.add("id", id); form.add("balance", balance); ClientResponse response = service.path(rest).path(bank).type(mediatype.application_form_urlencoded).post(clientresponse.class, form); NOTE: This will be processed by line 80 of Bank.java 9

10 CreaQng a bank account from the client New account processing is on line 66: if (cmd.equalsignorecase("open")) { // Open a new account // Open an account Account newaccount = new Account(s.nextInt(), s.nextint(), s.next()); ClientResponse response = service.path(rest).path(bank).path(new Integer(newAccount.getId()).toString()).accept(MediaType.APPLICATION_XML).put(ClientResponse.class, newaccount); return response.tostring(); 10

11 Processing the open request by the bank Open request is processed first by bank object on line 99 and then by AcQon instance on public Response putaccount(jaxbelement<account> acct) { Account c = acct.getvalue(); return putandgetresponse(c); 11

12 Processing the put request private Response putandgetresponse(account account) { Response res; if (Accounts.getInstance().find(account.getId())!= null) { //res = Response.noContent().build(); res = Response.ok().build(); else { res = Response.created(uriInfo.getAbsolutePath()).build(); Accounts.getInstance().open(account); return res; 12

13 Summary Require model objects which are serializable: On client, need WebResource object which captures RESTful web service endpoint Create path to web service with path the format to be format processed by method 13