import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import java.util.*;
public class MyServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// You can still access request parameters here
String action = request.getParameter("action");
// Output parameter value
System.out.println("Action parameter value: " + action);
// Continue processing the request
// ...
}
}
class MyFilter implements Filter {
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// Initialization code, if needed
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
// Wrap the original request with BufferedRequestWrapper
BufferedRequestWrapper bufferedRequest = new BufferedRequestWrapper((HttpServletRequest) request);
// You can still access request parameters inside the filter
String action = bufferedRequest.getParameter("action");
// Output parameter value
System.out.println("Action parameter value inside filter: " + action);
// Pass the wrapped request down the filter chain
chain.doFilter(bufferedRequest, response);
}
@Override
public void destroy() {
// Cleanup code, if needed
}
}
class BufferedRequestWrapper extends HttpServletRequestWrapper {
private final String body;
private final Map<String, String[]> parameters;
public BufferedRequestWrapper(HttpServletRequest request) throws IOException {
super(request);
StringBuilder stringBuilder = new StringBuilder();
BufferedReader bufferedReader = null;
parameters = new HashMap<>(request.getParameterMap());
try {
InputStream inputStream = request.getInputStream();
if (inputStream != null) {
bufferedReader = new BufferedReader(new InputStreamReader(inputStream));
char[] charBuffer = new char[1024];
int bytesRead;
while ((bytesRead = bufferedReader.read(charBuffer)) > 0) {
stringBuilder.append(charBuffer, 0, bytesRead);
}
} else {
stringBuilder.append("");
}
} finally {
if (bufferedReader != null) {
bufferedReader.close();
}
}
body = stringBuilder.toString();
}
@Override
public ServletInputStream getInputStream() throws IOException {
final ByteArrayInputStream byteArrayInputStream = new ByteArrayInputStream(body.getBytes());
return new ServletInputStream() {
public int read() throws IOException {
return byteArrayInputStream.read();
}
@Override
public boolean isFinished() {
return byteArrayInputStream.available() == 0;
}
@Override
public boolean isReady() {
return true;
}
@Override
public void setReadListener(ReadListener listener) {
// Not implemented
}
};
}
@Override
public BufferedReader getReader() throws IOException {
return new BufferedReader(new InputStreamReader(this.getInputStream()));
}
@Override
public String getParameter(String name) {
String[] values = parameters.get(name);
return (values != null && values.length > 0) ? values[0] : null;
}
@Override
public Map<String, String[]> getParameterMap() {
return parameters;
}
@Override
public Enumeration<String> getParameterNames() {
return Collections.enumeration(parameters.keySet());
}
@Override
public String[] getParameterValues(String name) {
return parameters.get(name);
}
}
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