vb.net code to generate barcode The following discussion addresses these points in more detail. in Java

Generating PDF417 in Java The following discussion addresses these points in more detail.

The following discussion addresses these points in more detail.
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Making POST Calls and GET Calls
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Making POST and GET calls is a very simple process. All you have to do is set the method property value to POST or GET, as required, and send the request to the server. For example, you use the following in MXML:
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<mx:HTTPService id=" myHTTPService " method="POST" ..../>
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and here s how you d do this in ActionScript:
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myHTTPService.method = "POST";
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Sending Parameters with the Request
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The first step in sending parameters with the request is to create an object of type Object, the root object in ActionScript. The next step is to create variables or attributes in this object. Variable names map to the names in the name-value parameter pairs. Next, assign the value to the corresponding variable values. Finally, pass the object as the send method call argument. Let s walk through a quick example to see how this plays out.
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Say your URL is myURL and it takes two parameters, userName and password, which can be passed to it as a part of the GET call query string, like this:
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http://myHost:myPort/myURL userName="myName"&password="myPassword"
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In real life, sending the password over an HTTP GET method request poses security risks. To avoid this risk, it s advisable to use either the HTTP POST method or the HTTPS secure protocol instead. In your HTTPService request, you do the following:
var params:Object = new Object(); params["userName"] = "myName"; params["password"] = "myPassword"; myHTTPService.send(params);
If it s a POST request, you take the same approach, although it maps to hidden variable passing and is not passed as a part of the query string.
Invoking URL(s) Accessible over the Secure HTTPS Protocol
If a Flex application is served over HTTPS, it can make HTTP and HTTPS requests without making any special provisions. However, if the Flex application is served over HTTP and it needs to make HTTPS requests, a few extra configurations are required. A security policy needs to be defined so that you don t violate the Flash Player security sandbox model, which restricts HTTPS requests over HTTP without such a security policy definition. Cross-domain security is defined in a file named crossdomain.xml. Here s the simplest example of a crossdomain.xml file:
<cross-domain-policy> <allow-access-from domain="*" secure="false" /> </cross-domain-policy>
This is because HTTP and HTTPS are served over different ports. HTTPS usually uses port 443 and HTTP uses port 80. A few more things need to be done beyond this cross-domain file if a server-side proxy is in use. But the focus here is on using HTTPService without a server-side proxy, so we ll ignore the entire server-side configuration for now. Just one quick note before moving to the next topic: you may have read advice to include https as the value of the protocol attribute in the HTTPService (or, for that matter, the WebService) tag. However, this isn t applicable when there s no server-side proxy in use. With no server-side proxy, such a setting would throw an exception.
Managing User Sessions
User sessions have two use cases in HTML-based web applications:
Maintain the conversation between the client (browser) and the server. Implement authentication and authorization schemes.
In Flex applications, the first of these is generally not relevant. Maintaining the conversation between the client (browser) and the server is important in HTML-based web applications. HTTP is a stateless protocol, so each request is independent of all others. In order to have continuity between successive requests, you need to have a common token among them. This token or identifier is passed back and forth with each
INTEGRATING FLEX WITH JAVA USING SERVICES
request. Flex is a thick-client technology, because it runs within a Flash Player/VM, which can hold data in memory. Therefore, the use of sessions for the purpose of keeping the conversation going between the client and the server is redundant. However, in data service driven Flex applications, things can get a bit complicated, and there may be situations where it is still valid. The second situation is still valid. Flex applications may still need sessions for authentication and authorization. Whatever the purpose, the ways of implementing them are the same. You need to do the following: 1. 2. Pass in the credentials, say username and password, as the part of the first request. Generate a server-side token using the passed-in credentials. This token could be as simple as the original data or as complex as an MD5 signature. Passing the data as is makes it susceptible to hacking and is obviously not recommended. Send the token back to the Flex application as a part of the response. Save this token on the client. For application-wide access, save it in the SharedObject. Pass in the token with all subsequent requests.
3. 4. 5.
You can add a session timeout feature to this process, to avoid the token being alive forever. In that case, set the session timeout when creating the token. Save the session timeout value on the server. On every request that carries the token along, verify whether the session is still valid (i.e., the timeout has not been activated yet). If not, ask the user to pass the credentials one more time or keep extending the timeout with every request so that the user session is kept alive so long as the user is not inactive for the duration of the timeout. These are choices that should be made depending on the application s authentication and authorization needs.
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