69 lines
2.0 KiB
Java
69 lines
2.0 KiB
Java
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JSP Http servlet response wrapper
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package com.ack.web.servlet;
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import java.io.IOException;
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import java.io.PrintWriter;
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import javax.servlet.ServletOutputStream;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpServletResponseWrapper;
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/**
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* JSPHttpServletResponseWrapper is used to adapt the response of a servlet.
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* The wrappers sole responsibility is to create a JSPServletOutputStream
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* off the provided HttpServletResponse. The JSPServletOutputStream is when
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* we can customize when is streamed back to the HTTP client. The
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* JSPHttpServletResponseWrapper provides the infrastructural scaffolding to
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* plug into our specialising output stream.
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*/
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public class JSPHttpServletResponseWrapper extends HttpServletResponseWrapper {
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protected ServletOutputStream stream = null;
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protected PrintWriter writer = null;
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protected HttpServletResponse origResponse = null;
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public JSPHttpServletResponseWrapper( HttpServletResponse response ) {
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super( response );
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response.setContentType("text/plain");
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origResponse = response;
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}
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public ServletOutputStream createOutputStream()
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throws IOException {
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return ( new JSPServletOutputStream( origResponse ) );
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}
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public ServletOutputStream getOutputStream()
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throws IOException {
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if( writer != null ) {
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throw new IllegalStateException( "getWriter() has already been " +
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"called for this response" );
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}
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if( stream == null ) {
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stream = createOutputStream();
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}
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return stream;
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}
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public PrintWriter getWriter()
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throws IOException {
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if( writer != null ) {
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return writer;
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}
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if( stream != null ) {
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throw new IllegalStateException( "getOutputStream() has already " +
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"been called for this response" );
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}
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stream = createOutputStream();
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writer = new PrintWriter( stream );
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return writer;
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}
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}
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