About Java Web development issues , neighborhoods

java web is divided into front-end and back-end is not it that the front end is not that html css javascript language to write ? And java does not matter much ah ?
backend is not is use of java ?
back in the end there is to learn what ah ? High requirements on javascript do ? Buy this javascript advanced programming point of view , I want to look confused and do not go directly to learn JSP, Servelt .... it
------ Solution - ------------------------------------------
jsp belong to the preceding < br> ------ Solution ----------------------------------------- ---
novice it, do a login function to achieve , you know what is what is the back end of the front .
------ Solution ---------------------------------------- ----
preceding html js ui css backend servlet and so on.
------ Solution ---------------------------------------- ----
front of the main job of UI, need to be proficient js, html, CSS, some mainstream js libraries, such as jquery. Solve each browser compatibility issues. js must be strong
------ Solution ------------------------------------- -------

rear right js requirements are as high as you  
back , then look into what kind of company you are , if you enter a small company , it would be almost anything , from front to back , development, implementation , research needs have to do . Hearts are more than body, keep enthusiasm for their own custom a short-term learning goals , one step at a time .
------ Solution ---------------------------------------- ----
learned javase no ? Learn go for servlet, jsp go , until ready to use front-end technology to go back when school .
------ Solution ---------------------------------------- ----
front : html css javascript background is the real java code , the other is used to display the jsp , javascript do not need to study so deep , the first can understand simple little example can ever after school , the future will touch , html css with a one or two days time to look at first understand , mainly to learn the jsp and rear frame
------ For reference only --- ------------------------------------

What are the contents of that back ?
------ For reference only -------------------------------------- -

I have not learned so much it
------ For reference only ---------------------- -----------------

rear right js requirements are as high as you
------ For reference only ----- ----------------------------------

rear right js requirements are as high as you          
back , then look into what kind of company you are , if you enter a small company , it would be almost anything , from front to back , development, implementation , research needs have to do . Hearts are more than body, keep enthusiasm for their own custom a short-term learning goals , one step at a time .  
know thank
------ For reference only --------------------------- ------------

Thank