Servlet入门第三个小例子

Refresh的响应头5秒后定时跳转

package com.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class AServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
/*
演示定时刷新
设置一个Refresh，它表示定时刷新！
*/
response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("utf-8");
/*
* 下面是用来发送响应体！
*/
PrintWriter out = response.getWriter();
out.print("欢迎张三登录,5秒后跳转到主页");
/*
* 设置名为Refresh的响应头
*/
response.setHeader("Refresh","5;URL=/Servlet04/BServlet");
}

}

package com.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class BServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("utf-8");
PrintWriter out = response.getWriter();
out.println("跳转成功,已成功跳转到主页");
}
}

字符串转换成字节输出

package com.servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class CServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
/*
* 字符串转换成字节
*/
String s="abcdefghijklmnopqwrestuvwxyz";
byte[] bytes=s.getBytes();
response.getOutputStream().write(bytes);

}

}