How to output HTML from JSP block

Question

I just started learning JSP technology  and came across a wall   How do you output HTML from a method in  lt           JSP declaration block   This doesn t work    lt     void someOutput         out println  Some Output        gt       lt   someOutput      gt    Server says there s no  ldquo out rdquo    U  I do know how to rewrite code with this method returning a string  but is there a way to do this inside  lt    void              Though it may be non-optimal  it s still interesting

User · Answer

too late to answer it but this help others    lt          public void printChild Categories cat  HttpServletResponse res           try            if cat getCategoriesSet   size    gt 0                 res getWriter   write                            catch Exception exp                       gt

User · Answer

You can do something like this    lt    String myMethod String input        return  test     input      gt    lt    myMethod  1 2 3     gt    This will output test 1 2 3 to the page

User · Answer

You can do something like this     lt    out print   lt p gt Hey  lt  p gt         out print   lt p gt How are you  lt  p gt        gt

User · Answer

lt    private void myFunc String Bits  javax servlet jsp JspWriter myOut        try  myOut println   lt div gt   Bits   lt  div gt          catch Exception eek          gt       lt     myFunc  more difficult than it should be  out     gt    Try this  it worked for me

User · Answer

A simple alternative would be the following    lt        String myVariable    Test       pageContext setAttribute  myVariable   myVariable     gt    lt c out value  myVariable   gt   lt h1 gt   myVariable  lt  h1 gt    The you could simply use the variable in any way within the jsp code

User · Answer

All you need to do is pass the JspWriter object into your method as a parameter i e   void someOutput JspWriter stream    Then call it via    lt   someOutput out    gt    The writer object is a local variable inside  jspService so you need to pass it into your utility method  The same would apply for all the other built in references  e g  request  response  session     A great way to see whats going on is to use Tomcat as your server and drill down into the  work  directory for the   java  file generated from your  jsp  page  Alternatively in weblogic you can use the  weblogic jspc  page compiler to view the Java that will be generated when the page is requested

User · Answer

You can t use the  out  variable  nor any of the other  predeclared  scriptlet variables  inside directives   The JSP page gets translated by your webserver into a Java servlet  Inside tomcats  for instance  everything inside scriptlets  which start   lt      along with all the static HTML  gets translated into one giant Java method which writes your page  line by line  to a JspWriter instance called  out   This is why you can use the  out  parameter directly in scriptlets  Directives  on the other hand  which start with   lt      get translated as separate Java methods   As an example  a very simple page  let s call it foo jsp     lt html gt       lt head  gt       lt body gt           lt                String someOutput                     return  Some output                           gt           lt   someOutput      gt       lt  body gt   lt  html gt    would end up looking something like this  with a lot of the detail ignored for clarity    public final class foo jsp          This is where the request comes in     public void  jspService HttpServletRequest request  HttpServletResponse response           throws IOException  ServletException                  JspWriter instance is gotten from a factory            This is why you can use  out  directly in scriptlets         JspWriter out                     Snip          out write   lt html gt             out write   lt head  gt             out write   lt body gt             out write someOutput        i e  write the results of the method call         out write   lt  body gt             out write   lt  html gt                   Directive gets translated as separate method - note        there is no  out  variable declared in scope     private String someOutput                 return  Some output

User · Answer

I suppose this would help    lt        String someOutput          return  Some Output         gt       lt    someOutput     gt    Anyway  it isn t a good idea to have code in a view

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