Google App Engine性能调优 - 页面性能优化
2009-09-06 00:00:00 来源:WEB开发网GenericResponseWrapper.java
package hover.blog.servlet;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServletResponseWrapper;
import java.io.*;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.logging.Logger;
/**
* @author Hover
* @version 1.0
*/
@SuppressWarnings("unchecked")
public class GenericResponseWrapper extends HttpServletResponseWrapper implements Serializable {
private static final Logger LOG = Logger.getLogger(GenericResponseWrapper.class.getName());
private int statusCode = SC_OK;
private int contentLength;
private String contentType;
private final List headers = new ArrayList();
private final List cookies = new ArrayList();
private ServletOutputStream outstr;
private PrintWriter writer;
/**
* Creates a GenericResponseWrapper
*/
public GenericResponseWrapper(final HttpServletResponse response, final OutputStream outstr) {
super(response);
this.outstr = new FilterServletOutputStream(outstr);
}
/**
* Gets the outputstream.
*/
public ServletOutputStream getOutputStream() {
return outstr;
}
/**
* Sets the status code for this response.
*/
public void setStatus(final int code) {
statusCode = code;
super.setStatus(code);
}
/**
* Send the error. If the response is not ok, most of the logic is bypassed and the error is sent raw
* Also, the content is not cached.
*
* @param i the status code
* @param string the error message
* @throws IOException
*/
public void sendError(int i, String string) throws IOException {
statusCode = i;
super.sendError(i, string);
}
/**
* Send the error. If the response is not ok, most of the logic is bypassed and the error is sent raw
* Also, the content is not cached.
*
* @param i the status code
* @throws IOException
*/
public void sendError(int i) throws IOException {
statusCode = i;
super.sendError(i);
}
/**
* Send the redirect. If the response is not ok, most of the logic is bypassed and the error is sent raw.
* Also, the content is not cached.
*
* @param string the URL to redirect to
* @throws IOException
*/
public void sendRedirect(String string) throws IOException {
statusCode = HttpServletResponse.SC_MOVED_TEMPORARILY;
super.sendRedirect(string);
}
/**
* Sets the status code for this response.
*/
public void setStatus(final int code, final String msg) {
statusCode = code;
LOG.warning("Discarding message because this method is deprecated.");
super.setStatus(code);
}
/**
* Returns the status code for this response.
*/
public int getStatus() {
return statusCode;
}
/**
* Sets the content length.
*/
public void setContentLength(final int length) {
this.contentLength = length;
super.setContentLength(length);
}
/**
* Gets the content length.
*/
public int getContentLength() {
return contentLength;
}
/**
* Sets the content type.
*/
public void setContentType(final String type) {
this.contentType = type;
super.setContentType(type);
}
/**
* Gets the content type.
*/
public String getContentType() {
return contentType;
}
/**
* Gets the print writer.
*/
public PrintWriter getWriter() throws IOException {
if (writer == null) {
writer = new PrintWriter(new OutputStreamWriter(outstr, getCharacterEncoding()), true);
}
return writer;
}
/**
* Adds a header.
*/
public void addHeader(final String name, final String value) {
final String[] header = new String[]{name, value};
headers.add(header);
super.addHeader(name, value);
}
/**
* @see #addHeader
*/
public void setHeader(final String name, final String value) {
addHeader(name, value);
}
/**
* Gets the headers.
*/
public List getHeaders() {
return headers;
}
/**
* Adds a cookie.
*/
public void addCookie(final Cookie cookie) {
cookies.add(cookie);
super.addCookie(cookie);
}
/**
* Gets all the cookies.
*/
public List getCookies() {
return cookies;
}
/**
* Flushes buffer and commits response to client.
*/
public void flushBuffer() throws IOException {
flush();
super.flushBuffer();
}
/**
* Resets the response.
*/
public void reset() {
super.reset();
cookies.clear();
headers.clear();
statusCode = SC_OK;
contentType = null;
contentLength = 0;
}
/**
* Resets the buffers.
*/
public void resetBuffer() {
super.resetBuffer();
}
/**
* Flushes all the streams for this response.
*/
public void flush() throws IOException {
if (writer != null) {
writer.flush();
}
outstr.flush();
}
}
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