五秒后自动跳转
登录成功跳到ServlectA代码
package com.Servlect;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/ServlectA")
public class ServlectA extends HttpServlet {
private static final long serialVersionUID = 1L;
public ServlectA() {
super();
// TODO Auto-generated constructor stub
System.out.println("ServlectA()的登录界面");
System.out.println("进入ServlectA的主界面");
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter pw=response.getWriter();
pw.append("欢迎来到登陆界面");
pw.append("
"
+ "autor 实践出总结 ");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
package com.Servlect;
import java.io.IOException;
import java.util.Arrays;
import java.util.Enumeration;
import java.util.Map;
import java.util.Map.Entry;
import javax.naming.InitialContext;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.omg.PortableInterceptor.RequestInfo;
public class ServlectB extends HttpServlet {
public ServlectB() {
// TODO Auto-generated constructor stub
System.out.println("ServlectB在运行");
System.out.println("开试运行代码程序· 进行判断");
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//获取数据
resp.setContentType("text/html");
resp.setCharacterEncoding("UTF-8");
ServletContext sc=getServletContext();
//获取web.xml文件中的镜头数据
String a=sc.getInitParameter("names");
String b=sc.getInitParameter("pws");
String c=sc.getInitParameter("pwsa");
System.out.println(a+"@@@@@@@@"+b+"######"+c);
resp.getWriter().append("ServletB获得静态数据用来访问name:"+a);
resp.getWriter().append("ServletB获得静态数据用来访问pws:"+b);
resp.getWriter().append("ServletB获得静态数据用来访问pwsa:"+b);
String aa=req.getParameter("name");
String bb=req.getParameter("password");
String cc=req.getParameter("passwords");
System.out.println(aa+":"+bb+":"+cc);
//不区分大小写equalsIgnoreCase(aa)
if(a.equalsIgnoreCase(aa)&&b.equalsIgnoreCase(bb)&&c.equalsIgnoreCase(cc)) {
//重定向跳转页面
resp.sendRedirect("ServlectA");
}else {
resp.sendRedirect("ServlectC");
}
}
}
package com.Servlect;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/ServlectC")
public class ServlectC extends HttpServlet {
private static final long serialVersionUID = 1L;
public ServlectC() {
super();
System.out.println("登录失败进入ServlectC界面");
// TODO Auto-generated constructor stub
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// 定义登录界面失败内容
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter pw=response.getWriter();
pw.append("跳转至ServletC,显示"登陆失败,用户名不存在或者密码错误,内"
+ "容不正确重新开始登录");
response.setHeader("refresh","5;URL=ServlectA");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
第二个项目
建立项目Day_08_JSp
代码内容
package com.entity;
public class Book {
private String bookName; //书名
private String autor; //作者
private String price;
private String address;//出版社
private String buyTime; //图书时间
//生成get set方法
//null构造方法 创建对象 在创建对象
//toString
public Book() {
// TODO Auto-generated constructor stub
}
public Book(String bookName, String autor, String price, String address, String buyTime) {
super();
this.bookName = bookName;
this.autor = autor;
this.price = price;
this.address = address;
this.buyTime = buyTime;
}
public String getBookName() {
return bookName;
}
public void setBookName(String bookName) {
this.bookName = bookName;
}
public String getAutor() {
return autor;
}
public void setAutor(String autor) {
this.autor = autor;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getBuyTime() {
return buyTime;
}
public void setBuyTime(String buyTime) {
this.buyTime = buyTime;
}
@Override
public String toString() {
return "Book [bookName=" + bookName + ", autor=" + autor + ", price=" + price + ", address=" + address
+ ", buyTime=" + buyTime + "]";
}
}
package com.entity;
import java.text.SimpleDateFormat;
import java.util.Date;
public class phone {
private String pname;//手机名称
private String pmodel;
private String color;
private String price;
private String land; //手机厚度
public phone() {
// TODO Auto-generated constructor stub
}
public phone(String pname, String pmodel, String color, String price, String land) {
super();
this.pname = pname;
this.pmodel = pmodel;
this.color = color;
this.price = price;
this.land = land;
}
public String getPname() {
return pname;
}
public void setPname(String pname) {
this.pname = pname;
}
public String getPmodel() {
return pmodel;
}
public void setPmodel(String pmodel) {
this.pmodel = pmodel;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public String getLand() {
return land;
}
public void setLand(String land) {
this.land = land;
}
@Override
public String toString() {
return "phone [pname=" + pname + ", pmodel=" + pmodel + ", color=" + color + ", price=" + price + ", land="
+ land + "]";
}
public String getTime() {
// TODO Auto-generated method stub
Date date=new Date();
//2021年10月19日
SimpleDateFormat sdf=new SimpleDateFormat ("YYYY年MM月DD日HH:mm:ss");
//要求当前时间进行格式化
String time=sdf.format(date);
return null;
}
public void setBuyTime(String time) {
// TODO Auto-generated method stub
//2021年10月19日
}
}
package com.Servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.entity.Book;
@WebServlet("/alertServlet")
public class alertServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public alertServlet() {
super();
// TODO Auto-generated constructor stub
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
Book book=(Book) request.getAttribute("book");
String info="当前《"+book.getBookName()+"书籍购买成功，如需需要再次购买请点击这里回到购书页面,"
+ "或者10秒之后自动跳转至首页";
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
//
response.setHeader("refresh", "1"+"开始倒计时");
//五秒后自动跳转到HomeServlet
response.setHeader("refresh", "10;url=HomeServlet");
PrintWriter pw=response.getWriter();
pw.print(info);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
package com.Servlet;
import java.io.IOException;
import java.sql.Connection;
import java.util.ArrayList;
import java.util.List;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.entity.Book;
import com.util.BooksDBUtil;
@WebServlet("/GetBuyBookInfoServlet")
public class GetBuyBookInfoServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public GetBuyBookInfoServlet() {
super();
// TODO Auto-generated constructor stub
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获得浏览器发送的下标
String index=request.getParameter("index");
int i=Integer.parseInt(index);
//根据下标从书库中定位到用户要购买的是哪本书
List oBooks=BooksDBUtil.getBooks();
Book book=oBooks.get(i);
//获得当前购买的实时时间
String time=BooksDBUtil.getNowTime();
book.setBuyTime(time);
//存储至ServletContext对象中
ServletContext sc=getServletContext();
//先判断ServletContext是否有其他的购买记录
//如果有，新的购买记录只需要添加到原有的list集合里面
//如果没有，现在是第一次买书，ServletContext之前没有保存过购买记录，也就意味着该对象中并不存在list集合
Object object=sc.getAttribute("orders");
List oList=null;
if (object==null) {
//说明从来都没有保存过购买记录
oList=new ArrayList();
oList.add(book);
}else {
//如果以前有保存过购买记录
oList=(List) object;
oList.add(book);
}
//将更新后的list集合保存至ServletContext对象
sc.setAttribute("orders", oList);
//跳转至一个Servlet页面，告诉用户当前购买成功，如需再次购买请点击这里回到购书页面
//如果Servlet之间跳转不需要携带数据，传递数据，一般使用重定向
//否则使用请求转发
request.setAttribute("book", book);
request.getRequestDispatcher("alertServlet").forward(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
package com.Servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(urlPatterns = "/HomeServlet",initParams = {
@WebInitParam(name="buyBook",value="购买图书"),
@WebInitParam(name="selectOrder",value="查看记录"),
//增加一个界面为手机管理
@WebInitParam(name="buyBookA",value="购买图书A ")
})
public class HomeServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
String buyBook ="";
String buyBookA ="";
String selectOrder="";
public HomeServlet() {
super();
System.out.println("HomeServlet() 在运行主界面中");
// TODO Auto-generated constructor stub
}
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
//得到二个静态数据
buyBook =config.getInitParameter("buyBook");
buyBookA =config.getInitParameter("buyBookA");
selectOrder =config.getInitParameter("selectOrder");
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//当浏览器访问Servlet的组成浏览器能看到的页面
response.setContentType("text/html");
response.setCharacterEncoding("utf-8");
PrintWriter pw = response.getWriter();
pw.append("图书界面");
pw.append("");
pw.append(""+ buyBook+"
");
pw.append(""+ buyBookA+"
");
pw.append(""+selectOrder+"
");
pw.append("");
System.out.println(buyBook+selectOrder);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
package com.Servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.entity.Book;
import com.util.BooksDBUtil;
@WebServlet("/ShowBuyBookServlet")
public class ShowBuyBookServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public ShowBuyBookServlet() {
super();
// TODO Auto-generated constructor stub
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//从其他类中获取出要显示在浏览器上的所有图书信息
List oBooks=BooksDBUtil.getBooks();
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter pw=response.getWriter();
pw.append("手机浏览界面");
pw.append("");
pw.append("
");
pw.append("");
pw.append("书名 ");
pw.append("作者 ");
pw.append("单价 ");
pw.append("出版社 ");
pw.append("操作 ");
pw.append(" ");
//根据循环遍历list集合，从list集合中获得每一本图书信息
for (int i = 0; i < oBooks.size(); i++) {
pw.append("");
pw.append(""+oBooks.get(i).getBookName()+" ");
pw.append(""+oBooks.get(i).getAutor()+" ");
pw.append(""+oBooks.get(i).getPrice()+" ");
pw.append(""+oBooks.get(i).getAddress()+" ");
pw.append(""
+ " ");
pw.append(" ");
}
pw.append("
");
pw.append("");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
package com.Servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.entity.Book;
import com.util.BooksDBUtil;
import com.util.BooksDBUtilA;
@WebServlet("/ShowBuyBookServletA")
public class ShowBuyBookServletA extends HttpServlet {
private static final long serialVersionUID = 1L;
public ShowBuyBookServletA() {
super();
// TODO Auto-generated constructor stub
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//从其他类中获取出要显示在浏览器上的所有图书信息
List oBooks=BooksDBUtilA.getBooks();
response.setContentType("text/html");
response.setCharacterEncoding("UTF-8");
PrintWriter pw=response.getWriter();
pw.append("手机浏览界面");
pw.append("");
pw.append("
");
pw.append("");
pw.append("书名 ");
pw.append("作者 ");
pw.append("单价 ");
pw.append("出版社 ");
pw.append("操作 ");
pw.append(" ");
//根据循环遍历list集合，从list集合中获得每一本图书信息
for (int i = 0; i < oBooks.size(); i++) {
pw.append("");
pw.append(""+oBooks.get(i).getBookName()+" ");
pw.append(""+oBooks.get(i).getAutor()+" ");
pw.append(""+oBooks.get(i).getPrice()+" ");
pw.append(""+oBooks.get(i).getAddress()+" ");
pw.append(""
+ " ");
pw.append(" ");
}
pw.append("
");
pw.append("");
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
package com.util;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import com.entity.Book;
public class BooksDBUtil {
public static List getBooks(){
Book book1 =new Book("java程序设计","自由", "39元","人民日报","");
Book book2 =new Book("java网站设计","马玉", "89元","清华","");
Book book3 =new Book("javascript程序设计","不变", "239元","人民日报","");
Book book4 =new Book("jquery程序设计","胡毅", "189元","江西出版社","");
Book book5=new Book("mysql程序设计","ok", "179元","北大","");
Book book6 =new Book("Sping框架设计","胡三", "129元","人民日报","");
Book book7 =new Book("java高级编程","呼万岁", "159元","河南出版社","");
Book book8=new Book("ps设计","ok", "239元","西安出版社","");
Book book9 =new Book("Sping框架设计","胡三", "129元","人民日报","");
Book book10=new Book("Java程序设计", "马云", "78.0元", "人民邮电出版社", "");
Book book11=new Book("Jsp网络编程", "马化腾", "118.0元", "清华大学出版社", "");
Book book12=new Book("Python爬虫技术", "李彦宏", "65.0元", "电子工业出版社", "");
Book book13=new Book("网页程序设计", "任正非", "38.0元", "江西出版社", "");
Book book14=new Book("MySQL程序教程", "雷军", "59.0元", "吉林出版社", "");
Book book15=new Book("Spring框架技术", "马小云", "46.0元", "人民邮电出版社", "");
List oBooks=new ArrayList();
oBooks.add(book1);
oBooks.add(book2);
oBooks.add(book3);
oBooks.add(book4);
oBooks.add(book5);
oBooks.add(book6);
oBooks.add(book7);
oBooks.add(book8);
oBooks.add(book9);
oBooks.add(book10);
oBooks.add(book11);
oBooks.add(book12);
oBooks.add(book13);
oBooks.add(book14);
oBooks.add(book15);
return oBooks;
}
public static String getNowTime() {
Date date=new Date();
//2021年10月19日
SimpleDateFormat sdf=new SimpleDateFormat ("YYYY年MM月DD日HH:mm:ss");
//要求当前时间进行格式化
String time=sdf.format(date);
return time;
}
}
package com.util;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import com.entity.Book;
public class BooksDBUtilA {
public static List getBooks(){
Book book1 =new Book("java基础","自由", "39元","人民日报","");
Book book2 =new Book("html网站设计","马玉", "489元","清华","");
Book book3 =new Book("javascript程序设计","不变", "239元","人民日报","");
Book book4 =new Book("jquery程序设计","胡毅", "189元","江西出版社","");
Book book5=new Book("mysql程序设计","ok", "179元","北大","");
Book book6 =new Book("Sping框架设计","胡三", "129元","人民日报","");
Book book7 =new Book("java高级编程","呼万岁", "159元","河南出版社","");
Book book8=new Book("ps设计","ok", "239元","西安出版社","");
Book book9 =new Book("Sping框架设计","胡三", "129元","人民日报","");
Book book10=new Book("Java程序设计", "马云", "78.0元", "人民邮电出版社", "");
Book book11=new Book("Jsp网络编程", "马化腾", "118.0元", "清华大学出版社", "");
Book book12=new Book("Python爬虫技术", "李彦宏", "65.0元", "电子工业出版社", "");
Book book13=new Book("网页程序设计", "任正非", "38.0元", "江西出版社", "");
Book book14=new Book("MySQL程序教程", "雷军", "59.0元", "吉林出版社", "");
Book book15=new Book("Spring框架技术", "马小云", "46.0元", "人民邮电出版社", "");
List oBooks=new ArrayList();
oBooks.add(book1);
oBooks.add(book2);
oBooks.add(book3);
oBooks.add(book4);
oBooks.add(book5);
oBooks.add(book6);
oBooks.add(book7);
oBooks.add(book8);
oBooks.add(book9);
oBooks.add(book10);
oBooks.add(book11);
oBooks.add(book12);
oBooks.add(book13);
oBooks.add(book14);
oBooks.add(book15);
return oBooks;
}
public static String getNowTime() {
Date date=new Date();
//2021年10月19日
SimpleDateFormat sdf=new SimpleDateFormat ("YYYY年MM月DD日HH:mm:ss");
//要求当前时间进行格式化
String time=sdf.format(date);
return time;
}
}
运行结果
思考一下这俩个小项目如何综合结合起来使用？
