樣本說明：通過一個表單提交頁面提交給Servlet，Servlet擷取資訊，經過處理後，將資訊存入request對象中，如果使用者提交姓名為空白，將重新返回登入首頁，否則，把提交的資訊全部顯示出來
下面具體實現了~~
1、建立一個Dynamic WEB工程，名為formtt
2、建立一個登入介面index.jsp，完成登入介面的編寫，具體代碼如下：
<%@ page language="java" contentType="text/html; charset=GBK" pageEncoding="GBK"%><!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=GBK"><title>表單提交</title></head><body><br/><form id="form1" name="form1" method="post" action="test"> <p align="center"><strong>表單提交</strong></p> <table width="331" height="147" border="1" align="center" cellpadding="0" cellspacing="0"> <tr> <td width="76" height="35">username：</td> <td width="183"><label> <input type="text" name="name" id="textfield" height="20"/> </label></td> <td width="50"> </td> </tr> <tr> <td>sex：</td> <td><input type="radio" name="sex" value="boy"/>boy<input type="radio" name="sex" value="girl"/>girl</td> <td> </td> </tr> <tr> <td>address：</td> <td><input type="text" name="address" id="textfield3" height="20"/></td> <td> </td> </tr> <tr> <td>likes：</td> <td><label> <input type="checkbox" name="likes" id="checkbox" value="sing" />sing <input type="checkbox" name="likes" id="checkbox2" value="dance"/>dance <input type="checkbox" name="likes" id="checkbox3" value="game"/>game </label></td> <td> </td> </tr> <tr> <td> </td> <td><input name="" type="submit" value="submit" /> <input name="" type="reset" value="reset" /></td> <td> </td> </tr> </table></form></body></html>具體的介面如下：
3、在伺服器端建立一個包org.luojs.servlet，然後在該包下建立一個TestServlet的Java類，完成伺服器端對錶單的處理
具體代碼如下：
package org.luojs.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class TestServlet extends HttpServlet{public void destroy() {super.destroy();}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {this.doPost(request, response);}public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// 擷取表單資訊String name = request.getParameter("name");String sex = request.getParameter("sex");String address = request.getParameter("address");String[] likes = request.getParameterValues("likes");String URL = "index.jsp";String likes2 = "";if (null != likes) {for (String string : likes) {likes2 += string + " ";}}if (null != name && !name.equals("")) {// 把從頁面擷取的內容放入request中request.setAttribute("name", name);request.setAttribute("sex", sex);request.setAttribute("address", address);request.setAttribute("likes", likes2);URL = "result.jsp";}request.getRequestDispatcher(URL).forward(request, response);}public void init() throws ServletException {}}
<?xml version="1.0" encoding="UTF-8"?><web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0" metadata-complete="true"> <!-- 註冊servlet資訊 --> <servlet> <servlet-name>TestServlet</servlet-name> <servlet-class>org.luojs.servlet.TestServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>TestServlet</servlet-name> <url-pattern>/test</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> </web-app>
但輸入中文文字時，出現的是亂碼
所以，你要用filter監聽器技術來實現中文亂碼解決的問題~~
（1）在org.luojs.servlet包下建立一個CharaterEncoding的Java類，具體代碼如下：
package org.luojs.servlet;import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;public class CharacterEncoding implements Filter{private FilterConfig config;//此filter被釋放時的回調方法public void destroy() {}//主要做過濾工作的方法//FilterChain用於調用過濾器鏈中的下一個過濾器public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {//擷取此Filter的初始參數的值String encoding = config.getInitParameter("encoding");if(null != encoding && !"".equals(encoding)){request.setCharacterEncoding(encoding); //佈建要求資料的編碼方式} //把請求和響應對象傳給過濾鏈中的下一個要調用的過濾器或Sevletchain.doFilter(request, response);}//些filter初始化時的回調方法//FilterConfig介面執行個體中封裝了這個Filter的初始化參數public void init(FilterConfig config) throws ServletException {this.config = config;}}
<!-- 解決中文亂碼問題 --> <filter> <filter-name>CharacterEncoding</filter-name> <filter-class>org.luojs.servlet.CharacterEncoding</filter-class> <init-param> <param-name>encoding</param-name> <param-value>GBK</param-value> </init-param> </filter><filter-mapping><filter-name>CharacterEncoding</filter-name><url-pattern>/*</url-pattern></filter-mapping>
參考書目：《JSP基礎與案例開發詳解》，清華大學出版社
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