Jsp頁面請求-Servlet返回結果
阿新 • • 發佈：2018-11-28
jsp頁面通過表單的方式提交請求，並傳進後臺引數，servlet接收請求再返回頁面顯示。
1.jsp頁面程式碼：
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8" import="com.service.entity.*,java.util.*"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%> <!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>學生資訊</title> </head> <body> <style type="text/css"> table.dataintable { margin-top:15px; border-collapse:collapse; border:1px solid #aaa; width:100%; } table.dataintable th { vertical-align:baseline; padding:5px 15px 5px 6px; background-color:#3F3F3F; border:1px solid #3F3F3F; text-align:left; color:#fff; } table.dataintable td { vertical-align:text-top; padding:6px 15px 6px 6px; border:1px solid #aaa; } table.dataintable tr:nth-child(odd) { background-color:#F5F5F5; } table.dataintable tr:nth-child(even) { background-color:#fff; } </style> <form action ="StudentServlet" method="get"> 輸入姓名：<input type="text" name="name"/> <input type="submit" value="查詢" /> </form> </div> <table class="dataintable"> <tr> <th>姓名</th> <th>語文</th> <th>數學</th> <th>英語</th> </tr> <c:forEach items="${list}" var="stu"> <tr> <td><b>${stu.getName()}</b></td> <td>${stu.getChinese()}</td> <td>${stu.getMath()}</td> <td>${stu.getEnglish()}</td> </tr> </c:forEach> </body> </html>
首先編碼都是utf-8，所以開頭需要修改：
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8" import="com.service.entity.*,java.util.*"%>
import="com.service.entity.*,java.util.*是引入了Java包，來訪問物件的成員變數。
<c:forEach items="${list}" var="stu">
<tr>
<td><b>${stu.getName()}</b></td>
<td>${stu.getChinese()}</td>
<td>${stu.getMath()}</td>
<td>${stu.getEnglish()}</td>
</tr>
</c:forEach>
然後jsp引入了c:forEach，所以需要加：
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
加了之後需要引入兩個jar包，可以去下載jstl.jar+standard.jar兩個包
2.Java Servlet程式碼
package com.service.servlet; import java.io.IOException; import java.io.PrintWriter; import java.util.List; import javax.servlet.annotation.WebServlet; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.service.StudentService; @WebServlet("/StudentServlet") public class StudentServlet extends HttpServlet{ private static final long serialVersionUID = 1L; protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub // 處理響應資料的格式和編碼，通知瀏覽器資料的顯示方式 response.setCharacterEncoding("utf-8"); response.setContentType("text/html;charset=utf-8"); PrintWriter pw = response.getWriter(); pw.println("doGet!"); System.out.println ("doGet1"); String Name=request.getParameter("name"); StudentService ws = new StudentService(); List list = ws.GetStudentInfo(Name); request.setAttribute("list",list); request.getRequestDispatcher("/student.jsp").forward(request, response); } protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub } }
首先@WebServlet("/StudentServlet")是web.xml配置的servlet名
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<servlet>
<servlet-name>StudentServlet</servlet-name>
<servlet-class>com.service.servlet.StudentServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>StudentServlet</servlet-name>
<url-pattern>/service</url-pattern>
</servlet-mapping>
</web-app>和jsp檔案裡：
這三個地方的這個名字是一一對應的，不能寫錯。
還有就是，傳進來的引數：
這就整個請求->接收請求->處理請求->返回的過程。
最後結果展示：
