Examples of javax.servlet.jsp.JspWriter

javax.servlet.jsp.JspWriter
The actions and template data in a JSP page is written using the JspWriter object that is referenced by the implicit variable out which is initialized automatically using methods in the PageContext object.
This abstract class emulates some of the functionality found in the java.io.BufferedWriter and java.io.PrintWriter classes, however it differs in that it throws java.io.IOException from the print methods while PrintWriter does not.
Buffering
The initial JspWriter object is associated with the PrintWriter object of the ServletResponse in a way that depends on whether the page is or is not buffered. If the page is not buffered, output written to this JspWriter object will be written through to the PrintWriter directly, which will be created if necessary by invoking the getWriter() method on the response object. But if the page is buffered, the PrintWriter object will not be created until the buffer is flushed and operations like setContentType() are legal. Since this flexibility simplifies programming substantially, buffering is the default for JSP pages.
Buffering raises the issue of what to do when the buffer is exceeded. Two approaches can be taken:
- Exceeding the buffer is not a fatal error; when the buffer is exceeded, just flush the output.
- Exceeding the buffer is a fatal error; when the buffer is exceeded, raise an exception.
Both approaches are valid, and thus both are supported in the JSP technology. The behavior of a page is controlled by the autoFlush attribute, which defaults to true. In general, JSP pages that need to be sure that correct and complete data has been sent to their client may want to set autoFlush to false, with a typical case being that where the client is an application itself. On the other hand, JSP pages that send data that is meaningful even when partially constructed may want to set autoFlush to true; such as when the data is sent for immediate display through a browser. Each application will need to consider their specific needs.
An alternative considered was to make the buffer size unbounded; but, this had the disadvantage that runaway computations would consume an unbounded amount of resources.
The "out" implicit variable of a JSP implementation class is of this type. If the page directive selects autoflush="true" then all the I/O operations on this class shall automatically flush the contents of the buffer if an overflow condition would result if the current operation were performed without a flush. If autoflush="false" then all the I/O operations on this class shall throw an IOException if performing the current operation would result in a buffer overflow condition. @see java.io.Writer @see java.io.BufferedWriter @see java.io.PrintWriter


            results.append(getJavascriptEnd());
        }




        JspWriter writer = pageContext.getOut();
        try {
            writer.print(results.toString());
        }
        catch (IOException e) {
            throw new JspException(e.getMessage());
        }

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            }
            if (rules.size() == 0) {
                throw new JspException("no valang validation rules were found");
            }


            JspWriter out = pageContext.getOut();
            out.write("<script type=\"text/javascript\" id=\"");
            out.write(commandName + "ValangValidator");
            out.write("\">");
            translator.writeJavaScriptValangValidator(out, commandName, true, rules, new MessageSourceAccessor(
                getRequestContext().getWebApplicationContext(), getRequestContext().getLocale()));
            out.write("</script>");
            return EVAL_PAGE;
        }
        catch (IOException e) {
            throw new JspException("Could not write validation rules", e);
        }

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        return SKIP_BODY;
    }


    public int doEndTag() throws JspException {
        try {
            JspWriter out = pageContext.getOut();
            if (includeScriptTags) {
                out.write("<script type=\"text/javascript\">\n");
            }
            copy(ValangJavaScriptTranslator.getCodebaseReader(), out);


            if (globalErrorsId != null) {
                out.write("ValangValidator.prototype.globalErrorsId = '" + globalErrorsId + "';\n");
            }
            if (fieldErrorIdSuffix != null) {
                out.write("ValangValidator.prototype.fieldErrorIdSuffix = '" + fieldErrorIdSuffix + "';\n");
            }
            if (logId != null) {
                out.write("ValangValidator.Logger.logId = '" + logId + "';\n");
            }
            if (includeScriptTags) {
                out.write("\n</script>");
            }
            return EVAL_PAGE;
        } catch (IOException e) {
            throw new JspException("Could not write validation codebase", e);
        }

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                if (commandName == null || commandObj == null) {
                    logger.error("Command object not found");
                    return EVAL_PAGE;
                }
            }
            JspWriter out = pageContext.getOut();
            Locale locale = getRequestContext().getLocale();
            WebApplicationContext webApplicationContext = getRequestContext().getWebApplicationContext();
            MessageSourceAccessor messages = new MessageSourceAccessor(webApplicationContext, locale);


            out.write("<script type=\"text/javascript\" id=\"" + commandName + "ValangValidator\">\n");
            cotvc.writeJS(commandName, commandObj, globalVar, validateOnSubmit, out, messages);
            out.write("\n</script>");


            return EVAL_PAGE;


        } catch (IOException e) {
            throw new JspException("Could not write validation rules", e);

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     * The implementation of this method is provided by the tag library developer,
     * and handles all tag processing, body iteration, etc.
     */
    @Override
    public void doTag() throws JspException {
        JspWriter out = getJspContext().getOut();


        HttpServletRequest request = (HttpServletRequest) ((PageContext) getJspContext()).getRequest();
        String line, requestBody = "", method;
        
        controller.setHttpRequest(request);

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    StringBuffer results = new StringBuffer("<a href=\"");
    results.append(response.encodeURL(url.toString()));
    results.append("\">");


    // Print this element to our output writer
    JspWriter writer = pageContext.getOut();
    try {
        writer.print(results.toString());
    } catch (IOException e) {
        throw new JspException
        (messages.getMessage("linkUser.io", e.toString()));
    }

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     */
    public int doEndTag() throws JspException {




    // Print the ending element to our output writer
    JspWriter writer = pageContext.getOut();
    try {
        writer.print("</a>");
    } catch (IOException e) {
        throw new JspException
            (messages.getMessage("link.io", e.toString()));
    }

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  }


  @Test
  public void testPrintGotoFormWritesValidXML() throws IOException,
         ParserConfigurationException, SAXException {
    JspWriter mockJspWriter = mock(JspWriter.class);
    ArgumentCaptor<String> arg = ArgumentCaptor.forClass(String.class);
    doAnswer(new Answer<Object>() {
      @Override
      public Object answer(InvocationOnMock invok) {
        Object[] args = invok.getArguments();

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    Assert.assertEquals(dnDesc1, live.get(1));
  }
  
  @Test
  public void testPrintMethods() throws IOException {
    JspWriter out = mock(JspWriter.class);      
    HttpServletRequest req = mock(HttpServletRequest.class);
    
    final StringBuffer buffer = new StringBuffer();
    
    ArgumentCaptor<String> arg = ArgumentCaptor.forClass(String.class);

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    * 
    **/


    public int doEndTag() throws JspException
    {
        JspWriter out = pageContext.getOut();


        try
        {
            out.print("</a>");
        }
        catch (IOException ex)
        {
            throw new JspException(
                Tapestry.format("AbstractLinkTag.io-exception", ex.getMessage()));

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