1. Form parameters are key-value pairs where both key and value are String objects only.
  2. A form parameter can be associated with single value or multiple values.
  3. بيع اسهم الجزيرة تكافل HttpServletRequest interface defines the following methods to retrieve form parameters at server side
    • getParameter(String name)
    • getParameterValues(String name)
    • getParameterNames()
    • getParameterMap()

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    public String getParameter(String name)

  1. Returns the value associated with specified form parameter
  2. If the parameter associated with multiple values then this method returns only first value
  3. If the specified parameter is not available then it returns null
  4. Argument is case sensitive.
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    public String[] getParameterValues(String name)

  1. It returns all values associated with specified form parameter
  2. If the parameter associated with multiple values then this method returns only first value
  3. If the specified parameter is not available then it returns null
  4. Argument is case sensitive.
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    الاهلي تداول وبيع اسهم String[] courses=request.getParameterValues("course"); for(String course:courses){ out.println(course); }

لو اشتريت اسهم ب 10000 getParameterNames()

    public Enumeration getParameterNames()

  1. It returns enumeration of all form parameter names
  2. If the request doesn’t associated with any request parameter then this method returns empty Enumeration object but not null
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    http://malkahans.com/?kypola=sg-forex-courses&280=7c sg forex courses Enumeration e=request.getParameterNames(); while(e.hasMoreElements()){ String name=(String)e.nextElement(); String value=request.getParameter(name); out.println(name+"----"+value); }

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    public Map getParameterMap()

  1. It returns the parameter names and parameter values in Map form
  2. Parameter names are keys, which are String objects.Parameter values are Map values,which are String array
  3. Map<String, String[]> m = req.getParameterMap();
      for (Map.Entry<String, String[]> e1 : m.entrySet()) {
    	String vname = (String) e1.getKey();
    	String[] values = (String[]) e1.getValue();
    	out.print(vname);
    	for (String s1 : values) {
        	    out.println(s1);
    	}
      }