上一篇講到了如何搭建服務(wù)器環(huán)境和運(yùn)行服務(wù)器斥扛。這一篇給大家講講jsp如何與服務(wù)器建立連接丹锹。
如果你想了解服務(wù)器環(huán)境如何配置，請(qǐng)參考：JSP 開發(fā)環(huán)境搭建與項(xiàng)目運(yùn)行（一）
下面棱烂，我們來(lái) 做一個(gè)將本地某個(gè)文件夾下的所有文件都顯示在網(wǎng)頁(yè)上的需求
第一步：創(chuàng)建Serve
package yqb_test_webserver;
import java.io.IOException;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class Hello extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* Default constructor.
*/
public Hello() {
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doPost(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("UTF-8");
response.getWriter().write("歡迎你：" + request.getParameter("username"));
HttpSession session = request.getSession();
List<String> names = Util.getFileName();
for (int i = 0; i < names.size(); i++) {
System.out.println(names.get(i));
}
session.setAttribute("names", names);
String path = "file:///Users/maomao/Documents/";
session.setAttribute("path", path);
String index = "index.jsp";
response.sendRedirect(index);
}
}
上面代碼的主要目的是獲取“file:///Users/maomao/Documents/”文件夾下面的所有文件名
session.setAttribute("names", names);是將數(shù)據(jù)源添加到session里面。key為“names”秃踩，吞瞪，session是連接服務(wù)器與jsp客戶端的橋梁。
response.sendRedirect("index.jsp");是返回?cái)?shù)據(jù)給到index.jsp文件驾孔，這樣index.jsp文件就會(huì)接收到來(lái)這里的數(shù)據(jù)了芍秆。
第二步：配置web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>yqb_test_webserver</display-name>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>Hello</servlet-name>
<servlet-class>yqb_test_webserver.Hello</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Hello</servlet-name>
<url-pattern>/login</url-pattern>
</servlet-mapping>
</web-app>
<welcome-file-list>
表示web服務(wù)器起來(lái)以后默認(rèn)顯示的頁(yè)面腊脱，這里寫了很多頁(yè)面吼畏，會(huì)從上到下依次尋找對(duì)應(yīng)的頁(yè)面，只要找到一個(gè)就可以顯示了查牌。
<servlet-mapping>
這里面配置接口類名稱和接口對(duì)應(yīng)key值对碌，“/login”是Hello.java對(duì)應(yīng)的客戶端調(diào)用的key值
第三步：配置jsp文件
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.util.*"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<ul>
<%
String path = (String) session.getAttribute("path");
String urlEnd = "/index.html";
List<String> names = (List<String>) session.getAttribute("names");
for (int i = 0; i < names.size(); i++) {
%>
<li><a href="<%=path + names.get(i) + urlEnd%>"><%=names.get(i)%></a></li>
<%
}
%>
</ul>
</body>
</html>
List<String> names =(List<String>)session.getAttribute("names");
通過(guò)這句代碼接收前面返回的文件名列表荆虱，后面是以列表形式展示文件名。
這是通過(guò)頁(yè)面直接獲取數(shù)據(jù)的示例怀读，下面的提交表單的示例：
<form action="login" method="POST">
name: <input type="text" name="username"> <br />
password: <input type="text" name="password" /> <input type="submit"
value="Submit" />
</form>
action="login"
這里的“l(fā)ogin”是在web.xml里面配置的接口名稱。
在Hello.java里面通過(guò)request.getParameter("username")就可以獲取用戶輸入的用戶名了骑脱。
以上就是jsp與服務(wù)器通信的全部?jī)?nèi)容菜枷，里面我踩過(guò)的坑都已經(jīng)提醒了大家，希望能夠幫助到你叁丧。
轉(zhuǎn)載請(qǐng)注明出處：http://www.reibang.com/p/6c9d298ecf26
謝謝啤誊！
參考文獻(xiàn)：
http://www.reibang.com/p/a8b34d6368f1
http://www.cnblogs.com/smyhvae/p/4046862.html
