看了servlet源码有一些疑问不明，望高手指点。
servlet运行在tomcat容器里面
public interface ServletResponse {
public abstract String getCharacterEncoding();
public abstract String getContentType();
public abstract ServletOutputStream getOutputStream() throws IOException;
public abstract PrintWriter getWriter() throws IOException;
public abstract void setCharacterEncoding(String s);
public abstract void setContentLength(int i);
public abstract void setContentType(String s);
public abstract void setBufferSize(int i);
public abstract int getBufferSize();
public abstract void flushBuffer() throws IOException;
public abstract void resetBuffer();
public abstract boolean isCommitted();
public abstract void reset();
public abstract void setLocale(Locale locale);
public abstract Locale getLocale();
}
