重温servlet②

package com.pcx.servlets;

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import java.io.File;

import java.io.FileInputStream;

import java.io.IOException;

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import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

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import org.apache.commons.io.IOUtils;

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/**

* @author 平常心cz

*测试io流

*/

public class Gservlet extends HttpServlet {

????/**

???? *

???? */

????private static final long serialVersionUID = 1L;

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????public void doGet(HttpServletRequest request, HttpServletResponse response)

????????????throws ServletException, IOException {

????????/**

???????? * 发送文字

???????? */

//????????String s="hello Response";

//????????byte[] bytes=s.getBytes();

//????????

//????????response.getOutputStream().write(bytes);

????????

????????/**

???????? * 发送图片

???????? */

????????String path ="D:/a.jpg";

????????FileInputStream in=new FileInputStream(new File(path));

????????byte[] bytes=IOUtils.toByteArray(in);

????????response.getOutputStream().write(bytes);

????}

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}

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????public void doGet(HttpServletRequest request, HttpServletResponse response)

????????????throws ServletException, IOException {

????????/**

???????? * 设置重定向

???????? * 1设置location

???????? * 2设置302状态码

???????? */

//????????response.setHeader("Location", "/zuoye/hello100.jsp");

//????????response.setStatus(302);

????????

????????/**

???????? * 快捷的重定向

???????? */

????????response.sendRedirect("http:www.baidu.com");

????}

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????/*

???? * 适用referer 来防盗链

???? */

????public void doGet(HttpServletRequest request, HttpServletResponse response)

????????????throws ServletException, IOException {

????????String referer=request.getHeader("Referer");

????????System.out.println(referer);

????????if (referer==null||!(referer.contains("localhost"))) {

????????????System.out.println("hello");

????????}else {

????????????response.sendRedirect("http://www.baidu.com");

????????}

????}

/**

* @author 平常心cz

*测试request的获取url

*/

public class Dservlet extends HttpServlet {

????

????public void doGet(HttpServletRequest request, HttpServletResponse response)

????????????throws ServletException, IOException {

????????response.getWriter().print(request.getScheme()+"<br/>");//获取请求协议

????????response.getWriter().print(request.getServerName()+"<br/>");//获取服务器的名称

????????response.getWriter().print(request.getServerPort()+"<br/>");//获取服务器的端口号

????????response.getWriter().print(request.getServletContext()+"<br/>");//获取项目名

????????response.getWriter().print(request.getServletPath()+"<br/>");//获取servlet的路径

????????response.getWriter().print(request.getQueryString()+"<br/>");//获取请求的参数

????????response.getWriter().print(request.getRequestURI()+"<br/>");//获取请求的uri

????????response.getWriter().print(request.getRequestURL()+"<br/>");//获取请求的url

????}

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}

package com.pcx.servlets;

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import java.io.IOException;

import java.util.Arrays;

import java.util.Enumeration;

import java.util.Map;

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import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

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/**

* @author 平常心cz

*测试request获取请求参数

*/

public class Fservlet extends HttpServlet {

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????public void doGet(HttpServletRequest request, HttpServletResponse response)

????????????throws ServletException, IOException {

????????System.out.println(request.getParameter("xxx"));

????????System.out.println(request.getParameter("yyy"));

????}

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????public void doPost(HttpServletRequest request, HttpServletResponse response)

????????????throws ServletException, IOException {

????????String username=request.getParameter("username");

????????String password=request.getParameter("password");

????????String[] hobbys=request.getParameterValues("hobby");

????????System.out.println(username+"\n"+password+"\n"+Arrays.toString(hobbys));

????????

????????/**

???????? * 测试获取多个参数名称

???????? */

????????Enumeration names=request.getAttributeNames();

????????while(names.hasMoreElements()){

????????????System.out.println(names.nextElement());

????????}

????????

????????/**

???????? * 获取所有的参数 并封装到map中

???????? */

????????Map<String, String[]>map=request.getParameterMap();

????????System.out.println(map);

????????for (String name : map.keySet()) {

????????????String [] values=map.get(name);

????????????System.out.println(name+"="+Arrays.toString(values));

????????}

????}

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}