如何得到Response响应的正文内容?

办法如下:
建立两个文件CharArrayWriter.java    ReplaceFilter.java
CharArrayWrapper.java
=============================================================
package vent.filter;import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;public class CharArrayWrapper
             extends HttpServletResponseWrapper {
  private CharArrayWriter charWriter;  public CharArrayWrapper(HttpServletResponse response) {
    super(response);
    charWriter = new CharArrayWriter();
  }  public PrintWriter getWriter() {
    return(new PrintWriter(charWriter));
  }  public String toString() {
    return(charWriter.toString());
  }  public char[] toCharArray() {
    return(charWriter.toCharArray());
  }
}
--------------------------------------------------
ReplaceFilter.java
--------------------------------------------------
package vent.filter;import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;public class ReplaceFilter implements Filter {
  private FilterConfig config;  public void doFilter(ServletRequest request,
                       ServletResponse response,
                       FilterChain chain)
        throws ServletException, IOException {
    CharArrayWrapper responseWrapper =
      new CharArrayWrapper((HttpServletResponse)response);
    chain.doFilter(request,responseWrapper);    String responseString = responseWrapper.toString();
    //--------------
    System.out.println(responseString);
    //这里responseString就是response响应的正文内容.(即网页的源代码)
    //对responseString处理的代码.
    //--------------    updateHeaders(response, responseString);    PrintWriter out = response.getWriter();
    out.write(responseString);
  }  public void init(FilterConfig config)
      throws ServletException {
    this.config = config;
  }  protected FilterConfig getFilterConfig() {
    return(config);
  }  public void destroy() {}  public void updateHeaders(ServletResponse response,
                            String responseString) {
    response.setContentLength(responseString.length());
  }
}然后就可以输出responseString的内容,得到的是网页的源代码.