How to set java heap size in Tomcat

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JSP

TOMCAT SERVER 5.5 I am using
How to Increase Java HEAP Size in JSP

whenever I export records of 60000 Data it give me error JAVA HEAP Size

javax.servlet.ServletException: Java heap space
    org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:825)
    org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:758)
    org.apache.jsp.frmExportDialer_jsp._jspService(org.apache.jsp.frmExportDialer_jsp:412)
    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:325)
    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:302)
    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:246)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:802)