Few questions from Beginner

Question

1. Tomcat and JSWDK , which one is better for starting development ?
2. Which IDE is better ? I use Kawa , but the HTML edit function is quite weak ?
3. POST and GET , what's the major difference , I only knew that POST is more secure and allow to submit long string .
4. What kind of validation should be done by Severlet , HTML (Javascript) , JavaBean , JSP ?

Answer 1

1 and 2. I don't have much experience with any of these, so I'll let someone else give their opinions on them
3. POST and GET , what's the major difference , I only knew that POST is more secure and allow to submit long string.:
Both a POST and a GET send a request to the server, but the difference is that any request parameters (such as those from a form or file upload) are stored in the URL string for a GET, whereas in the POST they are stored in the body of the request. Because a GET stores all it's parameters in the URL string, you are typically limited by the maximum length each individual browser can send in a URL string (often times 512 characters). Also, parameters in the GET are easily accessible by the user, which is sometimes not very aesthetic looking and certainly should not be used for sensitive information. POST requests can contain unlimited parameters since they are stored in the request data itself. These parameters are not "apparent" to the user, and as such are good for hidden parameters. However, do not assume that because the user can't see it, that the POST request is "secure". Only an SSL connection can do that.
4. What kind of validation should be done by Severlet , HTML (Javascript) , JavaBean , JSP ?
I typically use Javascript to do FORM validation, if necessary. However, servlets (and JSPs) can do parameter validation and throw errors if necessary.