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??? public void doFilter(ServletRequest request, ServletResponse response,
??????????? FilterChain chain) throws IOException, ServletException {

??????? HttpServletRequest req = (HttpServletRequest) request;

??????? int length = req.getContentLength();
??????? if (length > 0) {
??????????? BufferedRequestWrapper bufferedRequest = new BufferedRequestWrapper(req,length);

??????????? InputStream is = bufferedRequest.getInputStream();
??????????? byte[] content = new byte[length];
???????????
??????????? int pad = 0;
??????????? while(pad < length){
??????????????? pad += is.read(content, pad, length);
??????????? }

????????????request = bufferedRequest;
??????? }
??????? chain.doFilter(request, response);??????
??? }


BufferedRequestWrapper .java

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

import javax.servlet.ServletInputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class BufferedRequestWrapper extends HttpServletRequestWrapper {

??? ByteArrayInputStream bais;

??? BufferedServletInputStream bsis;

??? byte[] buffer;

??? public BufferedRequestWrapper(HttpServletRequest req,int length) throws IOException {
??????? super(req);
??????? // Read InputStream and store its content in a buffer.
??????? InputStream is = req.getInputStream();
??????? buffer = new byte[length];

??????? int pad = 0;
??????? while(pad < length){
??????????? pad += is.read(buffer, pad, length);
??????? }
??? }

??? public ServletInputStream getInputStream() {
??????? try {
??????????? // Generate a new InputStream by stored buffer
??????????? bais = new ByteArrayInputStream(buffer);
??????????? // Istantiate a subclass of ServletInputStream
??????????? // (Only ServletInputStream or subclasses of it are accepted by the
??????????? // servlet engine!)
??????????? bsis = new BufferedServletInputStream(bais);
??????? } catch (Exception ex) {
??????????? ex.printStackTrace();
??????? } finally {
??????? }
??????? return bsis;
??? }

}




BufferedServletInputStream .java

import java.io.*;
import javax.servlet.ServletInputStream;

/*
?Subclass of ServletInputStream needed by the servlet engine.
?All inputStream methods are wrapped and are delegated to
?the ByteArrayInputStream (obtained as constructor parameter)!
?*/
public class BufferedServletInputStream extends ServletInputStream {

??? ByteArrayInputStream bais;

??? public BufferedServletInputStream(ByteArrayInputStream bais) {
??????? this.bais = bais;
??? }

??? public int available() {
??????? return bais.available();
??? }

??? public int read() {
??????? return bais.read();
??? }

??? public int read(byte[] buf, int off, int len) {
??????? return bais.read(buf, off, len);
??? }

}

$ gcc -o x11fred -L/usr/openwin/lib x11fred.c -lX11
will compile and link a program called x11fred using the version of the library libX11 found in the
/usr/openwin/lib directory.