Servlet缓冲Buffer应用实例

Servlet缓冲Buffer应用,在现在的编程语言中有大量的编辑缓存技术，当然java的buffer也算是一种了，下面我们来看看关于servlet buffer的二种方法。

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.net.*;

public class MyServlet extends HttpServlet {

public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
res.setBufferSize(8 * 1024); // 8K buffer
res.setContentType("text/html");
PrintWriter out = res.getWriter();

int size = res.getBufferSize(); // returns 8096 or greater

// Record the default size, in the log
log("The default buffer size is " + size);

out.println("The client won't see this");
res.reset();
out.println("And this won't be seen if sendError() is called");
if (req.getParameter("important_parameter") == null) {
res.sendError(res.SC_BAD_REQUEST, "important_parameter needed");
}
}
}

<?xml version="1.0" encoding="ISO-8859-1"?>

PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.*s**un.com/j2ee/dtds/web-app_2_2.dtd">

MyServletName
MyServlet

MyServletName
/index.html

实例二

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;

public class MyServlet extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {

res.setContentType("text/html");

// Ask for a 16K byte response buffer; do not set the content length
res.setBufferSize(16 * 1024);

PrintWriter out = res.getWriter();
out.println("");
out.println("

Hello World");
out.println("");
out.println("Less than 16K of response body");
out.println("");
}
}

<?xml version="1.0" encoding="ISO-8859-1"?>

PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.*s**un.com/j2ee/dtds/web-app_2_2.dtd">

MyServletName
MyServlet

MyServletName
/index.html