JavaWeb总结（国税）
一、JavaWeb示例
1.1、Servlet Hello World&IDEA创建第一个Servlet
新建项目
选择maven
组织名与项目名
位置，完成
允许自动导入包
添加框架支持，变换成web项目
选择web application
如果没有Web-INF
添加Web容器支持，tomcat
添加tomcat
设置tomcat属性
设置虚拟目录
运行
添加一个Servlet
新建个一个用于存放servlet的包com.tax.action
结果
创建一个servlet
添加Servlet依赖的包
选择要依赖的环境
修改Servlet类，结果如下：
package com.tax.action; import java.io.IOException;
import java.io.PrintWriter; //注解，访问路径
@javax.servlet.annotation.WebServlet("/HiServlet")
public class HiServlet extends javax.servlet.http.HttpServlet {
protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
doGet(request,response);
} protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
//设置HTTP内容类型
response.setContentType("text/html;charset=utf-8");
//获得输出对象
PrintWriter out=response.getWriter();
//向客户端响应一串字符
out.println("<h2>Hello Servlet!</h2>");
}
}
运行结果：
1.2、获得参数
reg.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html>
<head>
<title>用户注册</title>
<meta charset="UTF-8" />
</head>
<body>
<form method="post" action="Reg">
<h2>用户注册</h2>
<p>
姓名：<input type="text" name="name"/>
</p>
<p>
爱好：
<input type="checkbox" name="hobby" value="运动"/>运动
<input type="checkbox" name="hobby" value="电影"/>电影
<input type="checkbox" name="hobby" value="阅读"/>阅读
</p>
<p>
<input type="submit" value="提交" />
</p>
</form>
</body>
</html>
Reg Servlet
package com.tax.action; 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 java.io.IOException;
import java.io.PrintWriter; @WebServlet("/Reg")
public class Reg extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//设置编码
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("utf-8");
//获得输出对象
PrintWriter out=response.getWriter();
//获得单个参数
String name=request.getParameter("name"); //获得元素name=name的值
out.println("姓名："+name+"<br/>");
//获得多个参数
String[] hobbies=request.getParameterValues("hobby"); //获得所有name=hobby的值，数组
out.println("爱好：");
for (String hobby:hobbies){ //遍历输出所有的爱好
out.println(hobby);
}
}
}
运行结果：
提交后
1.3、编码处理
前台
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
后台代码
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("utf-8");
字符
String msg = request.getParameter("message");
String str=new String(msg.getBytes("ISO-8859-1"),"UTF-8");
byte []b = ss.getBytes("GBK");
ss = new String(b,"UTF-8");
tomcat
server.xml文件
<Connector
port="80" maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
enableLookups="false" redirectPort="8443" acceptCount="100"
debug="0" connectionTimeout="20000"
disableUploadTimeout="true"
URIEncoding="UTF-8"
/>
1.4、重定向、转发与Session
login.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
//如果为空则获得空字符，否则取值
String uid = request.getParameter("uid") == null ? "" : request.getParameter("uid");
String pwd = request.getParameter("pwd") == null ? "" : request.getParameter("pwd");
Object msg=request.getAttribute("message")==null?"":request.getAttribute("message");
%>
<html>
<head>
<title>登录</title>
</head>
<body>
<form action="Login" method="post">
<p>
帐号：<input name="uid" value="<%=uid%>"/>
</p>
<p>
密码：<input name="pwd" type="password" value="<%=pwd%>"/>
</p>
<p>
<input type="submit" value="登录"/>
</p>
<p>
<%=msg.toString()%>
</p>
</form>
</body>
</html>
Login Servlet
package com.tax.action; 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 java.io.IOException;
import java.io.PrintWriter; @WebServlet("/Login")
public class Login extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//设置编码
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("utf-8");
//获得输出对象
PrintWriter out=response.getWriter();
//获得单个参数
String uid=request.getParameter("uid");
String pwd=request.getParameter("pwd");
//如果用户名与密码为admin，123456
if(uid.equals("admin")&&pwd.equals("123456")){
//向Session写入当前登录的用户信息
request.getSession().setAttribute("user",uid);
//成功，重定向到后台首页,路径变化了，但request,response对象在index.jsp中无法使用
response.sendRedirect("backend/index.jsp");
}else{
//在请求中添加属性
request.setAttribute("message","用户名或密码不正确");
//转发，路径不变，但request与response可以再使用
request.getRequestDispatcher("login.jsp").forward(request,response);
}
}
}
后台backend/index.jsp
<%--
Created by IntelliJ IDEA.
User: Administrator
Date: 2018/3/14
Time: 11:33
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%
Object user=request.getSession().getAttribute("user");
if(user==null) {
response.sendRedirect("../login.jsp");
}
%>
<html>
<head>
<title>Title</title>
</head>
<body>
<h2>欢迎您(<%=user+""%>)登录后台！</h2>
</body>
</html>
运行结果：
二、综合示例
2.1、Oracle数据库与表
create table book
(
id int not null primary key,
title varchar2(128) not null unique,
typename varchar2(128) not null,
price numeric(10,2) default(0),
state varchar2(10) default('未借出')
) insert into book(id,title,Typename,Price,State)
select 1,'零基础学Java（全彩版）','计算机',50.60,'未借出' from dual union
select 2,'轻量级Java EE企业应用实战','软件工程',85.30,'未借出' from dual union
select 3,'Java并发编程的艺术','软件工程',45.40,'未借出' from dual union
select 4,'实战Java高并发程序设计','软件开发',48.70,'未借出' from dual union
select 5,'Java程序员面试笔试宝典','神话',38.50,'已借出' from dual union
select 6,'Java Web从入门到精通','计算机',71.00,'未借出' from dual union
select 7,'Java编程思想(第4版)','计算机',70.10,'已借出' from dual union
select 8,'深入理解JAVA虚拟机','神话',65.00,'未借出' from dual union
select 9,'从零开始写Java Web框架','计算机',63.20,'已借出' from dual select id, title, typename, price, state from book
commit;
2.2、Java Bean
Book.java
package com.tax.model; /**图书*/
public class Book {
/**编号*/
private int id;
/**书名*/
private String title;
/**类型*/
private String typename;
/**价格*/
private double price;
/**状态*/
private String state; public int getId() {
return id;
} public void setId(int id) {
this.id = id;
} public String getTitle() {
return title;
} public void setTitle(String title) {
this.title = title;
} public String getTypename() {
return typename;
} public void setTypename(String typename) {
this.typename = typename;
} public double getPrice() {
return price;
} public void setPrice(double price) {
this.price = price;
} public String getState() {
return state;
} public void setState(String state) {
this.state = state;
}
}
2.3、BookDao 图书的数据访问层
2.3.1、添加Oracle驱动
2.3.2、封装JDBC数据访问工具类
package com.tax.dao; /**
* Created by Administrator on 2017/8/10.
*/ import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map; public class JDBCUtil { public static String DRIVER="oracle.jdbc.driver.OracleDriver";
public static String URL="jdbc:oracle:thin:@127.0.0.1:1521:orcl";
public static String USER_NAME="tax";
public static String PASSWORD="orcl"; //加载驱动
static {
try {
Class.forName(DRIVER);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
} private JDBCUtil() { } /**
* 获得连接
*
* @return
*/
public static Connection getconnnection() {
Connection con = null;
try {
con = DriverManager.getConnection(URL, USER_NAME, PASSWORD);
} catch (SQLException e) {
e.printStackTrace();
}
return con;
} /**
* 关闭连接
*
* @param rs
* @param st
* @param con
*/
public static void close(ResultSet rs, Statement st, Connection con) {
try {
try {
if (rs != null) {
rs.close();
}
} finally {
try {
if (st != null) {
st.close();
}
} finally {
if (con != null)
con.close();
}
}
} catch (SQLException e) {
e.printStackTrace();
}
} /**
* 关闭连接
*
* @param rs
*/
public static void close(ResultSet rs) {
Statement st = null;
Connection con = null;
try {
try {
if (rs != null) {
st = rs.getStatement();
rs.close();
}
} finally {
try {
if (st != null) {
con = st.getConnection();
st.close();
}
} finally {
if (con != null) {
con.close();
}
}
}
} catch (SQLException e) {
e.printStackTrace();
}
} /**
* 关闭连接
*
* @param st
* @param con
*/
public static void close(Statement st, Connection con) {
try {
try {
if (st != null) {
st.close();
}
} finally {
if (con != null)
con.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
} /**
* insert/update/delete
* 增加/更新/删除
*
* @param sql 数据库语句
* @param args 可变参数（可以不带参数，可以带0-n个参数）
* @return
*/
public static int update(String sql, Object... args) {
int result = 0;
Connection con = getconnnection();
PreparedStatement ps = null;
try {
ps = con.prepareStatement(sql);
if (args != null) {
for (int i = 0; i < args.length; i++) {
ps.setObject((i + 1), args[i]);
}
}
result = ps.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
close(ps, con);
} return result;
} /**
* query, because need to manually close the resource, so not recommended
* for use it
*
* @param sql
* @param args
* @return ResultSet
*/
@Deprecated //注解
public static ResultSet query(String sql, Object... args) {
ResultSet result = null;
Connection con = getconnnection();
PreparedStatement ps = null;
try {
ps = con.prepareStatement(sql);
if (args != null) {
for (int i = 0; i < args.length; i++) {
ps.setObject((i + 1), args[i]);
}
}
result = ps.executeQuery();
} catch (SQLException e) {
e.printStackTrace();
}
return result;
} /**
* Query a single record
* 查询单个记录
* @param sql
* @param args
* @return Map<String,Object>
*/
public static Map<String, Object> queryForMap(String sql, Object... args) {
Map<String, Object> result = new HashMap<String, Object>();
List<Map<String, Object>> list = queryForList(sql, args);
if (list.size() > 0) {
result = list.get(0);
}
return result;
} /**
* Query a single record
* 查询单个记录返回强类型对象
* @param sql
* @param args
* @return <T> //泛型
*/
public static <T> T queryForObject(String sql, Class<T> clz, Object... args) {
T result = null;
List<T> list = queryForList(sql, clz, args);
if (list.size() > 0) {
result = list.get(0);
}
return result;
} /**
* Query a single record
*
* @param sql
* @param args
* @return List<Map<String,Object>>
*/
public static List<Map<String, Object>> queryForList(String sql, Object... args) {
List<Map<String, Object>> result = new ArrayList<Map<String, Object>>();
Connection con = null;
ResultSet rs = null;
PreparedStatement ps = null;
try {
con = getconnnection();
ps = con.prepareStatement(sql);
if (args != null) {
for (int i = 0; i < args.length; i++) {
ps.setObject((i + 1), args[i]);
}
}
rs = ps.executeQuery();
ResultSetMetaData rsmd = rs.getMetaData();
int columnCount = rsmd.getColumnCount();
while (rs.next()) {
Map<String, Object> map = new HashMap<String, Object>();
for (int i = 1; i <= columnCount; i++) {
map.put(rsmd.getColumnLabel(i), rs.getObject(i));
}
result.add(map);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
close(rs, ps, con);
}
return result;
} /**
* Query records
* 查询多个对象，返回强类型集合
* @param sql
* @param args
* @return List<T>
*/
public static <T> List<T> queryForList(String sql, Class<T> clz, Object... args) {
List<T> result = new ArrayList<T>();
Connection con = null;
PreparedStatement ps = null;
ResultSet rs = null;
try {
con = getconnnection();
ps = con.prepareStatement(sql);
if (args != null) {
for (int i = 0; i < args.length; i++) {
ps.setObject((i + 1), args[i]);
}
}
rs = ps.executeQuery();
ResultSetMetaData rsmd = rs.getMetaData();
int columnCount = rsmd.getColumnCount();
while (rs.next()) {
T obj = clz.newInstance();
for (int i = 1; i <= columnCount; i++) {
String columnName = rsmd.getColumnName(i);
String methodName = "set" + columnName.substring(0, 1).toUpperCase()
+ columnName.substring(1, columnName.length()).toLowerCase();
Method method[] = clz.getMethods();
for (Method meth : method) {
if (methodName.equals(meth.getName())) {
meth.invoke(obj, rs.getObject(i));
}
}
}
result.add(obj);
}
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (InvocationTargetException e) {
e.printStackTrace();
} finally {
close(rs, ps, con);
}
return result;
}
}
2.3.3、BookDao访问图书表
package com.tax.dao; import com.tax.model.Book; import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List; /**
* 用于访问数据库中的Book表
*/
public class BookDao {
/***
* 获得所有的图书
* @return
*/
public List<Book> getAllBooks() {
List<Book> result = null;
Connection conn = null;
PreparedStatement statement = null;
ResultSet set = null;
try {
//获得连接对象
conn = JDBCUtil.getconnnection();
//创建sql命令对象
statement = conn.prepareStatement("select id, title, typename, price, state from book");
//执行查询返回结果集
set = statement.executeQuery();
result = new ArrayList<Book>();
//遍历结果集
while (set.next()) {
Book book = new Book(); //创建图书对象
book.setId(set.getInt("id")); //从结果集中获得当前行列名为id的值转成int类型
book.setTypename(set.getString("typename"));
book.setTitle(set.getString("title"));
book.setState(set.getString("state"));
book.setPrice(set.getDouble("price"));
result.add(book); //将图书对象添加到集合中
}
} catch (Exception e) {
e.printStackTrace();
} finally {
JDBCUtil.close(set, statement, conn);
} //返回结果
return result;
} public static void main(String[] args) {
BookDao dao=new BookDao();
for (Book book:dao.getAllBooks()) {
System.out.println(book.getTitle());
}
}
}
2.4、图书列表
Book.jsp
<%@ page import="com.tax.dao.BookDao" %>
<%@ page import="com.tax.model.Book" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <%
BookDao dao=new BookDao();
%> <!DOCTYPE html>
<html> <head>
<meta charset="UTF-8">
<title>Book</title>
<link rel="stylesheet" type="text/css" href="js/jPicture.min.css" />
<style type="text/css">
* {
margin: 0;
padding: 0;
} #container {
width: 1004px;
margin: 0 auto;
} #header {
height: 200px;
background: url(images/top.png) no-repeat;
} #menu {
background: orangered;
} #menu a {
width: 100px;
display: inline-block;
background: orangered;
height: 30px;
text-align: center;
line-height: 30px;
text-decoration: none;
color: white;
} #menu a:hover {
background: mistyrose;
color: orangered;
} #banner img {
width: 1004px;
} #main {
clear: both;
overflow: hidden;
margin-bottom: 10px;
} #main #left {
width: 30%;
float: left;
background: lightblue;
height: 400px;
} #main #right {
width: 70%;
float: left;
} #main .bookitem {
width: 30%;
float: left;
margin-right: 3%;
} #footer {
clear: both;
text-align: center;
background: lightsalmon;
height: 65px;
line-height: 30px;
padding-top: 5px;
} #left a {
width: 100%;
display: inline-block;
/*行内块标签，行内标签设置宽度无效*/
background: orangered;
height: 30px;
text-align: center;
line-height: 30px;
text-decoration: none;
/*去下划线*/
color: white;
} #banner{ width: 1004px; height: 300px;}
</style>
</head> <body>
<div id="container">
<div id="header"></div>
<div id="menu">
<a href="#">图书列表</a>
<a href="#">用户登录</a>
<a href="#">后台管理</a>
<a href="#">图书列表</a>
<a href="#">用户登录</a>
<a href="#">后台管理</a>
</div>
<div id="banner">
<div>
<div>
<a href="#">
<img src="data:images/adv3.jpg" />
</a>
</div>
<div>
<a href="#">
<img src="data:images/adv2.jpg" />
</a>
</div>
<div>
<a href="#">
<img src="data:images/adv1.jpg" />
</a>
</div>
</div>
</div>
<div id="main">
<div id="left">
<a href="#">图书列表</a>
<a href="#">用户登录</a>
<a href="#">后台管理</a>
<a href="#">图书列表</a>
<a href="#">用户登录</a>
<a href="#">后台管理</a>
</div>
<div id="right">
<%for (Book book: dao.getAllBooks()) {%>
<div class="bookitem">
<p class="picture">
<img src="data:images/book(<%=book.getId()%>).jpg" />
</p>
<p class="price">
￥<%=book.getPrice()%>
</p>
<p class="title">
<%=book.getTitle()%>
</p>
<p class="state">
<%=book.getState()%>
</p>
</div>
<%}%>
</div>
</div>
<div id="footer">
<p>
关于我们 | 联系我们 | 联系客服 | 合作招商 | 商家帮助 | 营销中心 | 手机书店 | 友情链接 | 销售联盟
</p>
<p>
Copyright @ 2004 - 2018 国税JavaEE版权所有
</p>
</div>
</div>
<script src="js/jquery-1.11.3.min.js" type="text/javascript" charset="utf-8"></script>
<script src="js/jPicture.min.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
jPicture("#banner", {
type: "slide",
autoplay: 2000
});
</script>
</body> </html>
结果：
2.5、JSTL+MVC展示图书
BookController控制器
package com.tax.action; import com.tax.dao.BookDao; 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 java.io.IOException; @WebServlet("/Book")
public class BookController extends HttpServlet {
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
BookDao dao=new BookDao();
request.setAttribute("books",dao.getAllBooks());
request.getRequestDispatcher("booklist.jsp").forward(request,response);
}
}
booklist.jsp视图
<%@ page import="com.tax.dao.BookDao" %>
<%@ page import="com.tax.model.Book" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %> <!DOCTYPE html>
<html> <head>
<meta charset="UTF-8">
<title>Book</title>
<link rel="stylesheet" type="text/css" href="js/jPicture.min.css"/>
<style type="text/css">
* {
margin: 0;
padding: 0;
} #container {
width: 1004px;
margin: 0 auto;
} #header {
height: 200px;
background: url(images/top.png) no-repeat;
} #menu {
background: orangered;
} #menu a {
width: 100px;
display: inline-block;
background: orangered;
height: 30px;
text-align: center;
line-height: 30px;
text-decoration: none;
color: white;
} #menu a:hover {
background: mistyrose;
color: orangered;
} #banner img {
width: 1004px;
} #main {
clear: both;
overflow: hidden;
margin-bottom: 10px;
} #main #left {
width: 30%;
float: left;
background: lightblue;
height: 400px;
} #main #right {
width: 70%;
float: left;
} #main .bookitem {
width: 30%;
float: left;
margin-right: 3%;
} #footer {
clear: both;
text-align: center;
background: lightsalmon;
height: 65px;
line-height: 30px;
padding-top: 5px;
} #left a {
width: 100%;
display: inline-block;
/*行内块标签，行内标签设置宽度无效*/
background: orangered;
height: 30px;
text-align: center;
line-height: 30px;
text-decoration: none;
/*去下划线*/
color: white;
} #banner {
width: 1004px;
height: 300px;
}
</style>
</head> <body>
<div id="container">
<div id="header"></div>
<div id="menu">
<a href="#">图书列表</a>
<a href="#">用户登录</a>
<a href="#">后台管理</a>
<a href="#">图书列表</a>
<a href="#">用户登录</a>
<a href="#">后台管理</a>
</div>
<div id="banner">
<div>
<div>
<a href="#">
<img src="data:images/adv3.jpg"/>
</a>
</div>
<div>
<a href="#">
<img src="data:images/adv2.jpg"/>
</a>
</div>
<div>
<a href="#">
<img src="data:images/adv1.jpg"/>
</a>
</div>
</div>
</div>
<div id="main">
<div id="left">
<a href="#">图书列表</a>
<a href="#">用户登录</a>
<a href="#">后台管理</a>
<a href="#">图书列表</a>
<a href="#">用户登录</a>
<a href="#">后台管理</a>
</div>
<div id="right">
<c:forEach var="book" items="${books}">
<div class="bookitem">
<p class="picture">
<img src="data:images/book(${book.id}).jpg"/>
</p>
<p class="price">
￥${book.price}
</p>
<p class="title">
${book.title}
</p>
<p class="state">
${book.state}
</p>
</div>
</c:forEach>
</div>
</div>
<div id="footer">
<p>
关于我们 | 联系我们 | 联系客服 | 合作招商 | 商家帮助 | 营销中心 | 手机书店 | 友情链接 | 销售联盟
</p>
<p>
Copyright @ 2004 - 2018 国税JavaEE版权所有
</p>
</div>
</div>
<script src="js/jquery-1.11.3.min.js" type="text/javascript" charset="utf-8"></script>
<script src="js/jPicture.min.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
jPicture("#banner", {
type: "slide",
autoplay: 2000
});
</script>
</body> </html>
结果：
2.6、添加图书
addBook.jsp
<%--
Created by IntelliJ IDEA.
User: Administrator
Date: 2018/3/14
Time: 17:07
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>添加图书</title>
</head>
<body>
<form method="post" action="AddBook">
<h2>添加图书</h2>
<fieldset>
<legend>图书详细</legend>
<p>
书名：<input type="text" name="title"/>
</p>
<p>
类型：<select name="typename">
<option value="计算机">计算机</option>
<option value="神话">神话</option>
<option value="软件工程">软件工程</option>
</select>
</p>
<p>
价格：<input type="text" name="price"/>
</p>
<p>
状态：<input type="checkbox" name="state" value="已借出"/>已借出
<input type="checkbox" name="state" value="未借出"/>未借出
</p>
<p>
描述：<textarea name="memo" cols="50" rows="5"></textarea>
</p>
<p>
<input type="submit" value="添加" />
</p>
<P>
<%=request.getAttribute("msg")==null?"":request.getAttribute("msg")%>
</P>
</fieldset>
</form>
</body>
</html>
AddBook Servlet
package com.tax.action; import com.tax.dao.BookDao;
import com.tax.model.Book; 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 java.io.IOException; @WebServlet("/AddBook")
public class AddBook extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//设置编码
request.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=utf-8");
response.setCharacterEncoding("utf-8"); String title=request.getParameter("title");
String state=request.getParameter("state");
String price=request.getParameter("price");
String typename=request.getParameter("typename"); Book book=new Book();
book.setTitle(title);
book.setState(state);
book.setTypename(typename);
book.setPrice(Double.parseDouble(price)); BookDao dao=new BookDao();
if(dao.add(book)>0)
{
response.sendRedirect("book.jsp");
}else {
request.setAttribute("msg","添加失败");
request.getRequestDispatcher("addBook.jsp").forward(request,response);
}
} }
运行结果
三、总结
day1
|
JavaWeb总结（国税）的更多相关文章
- 从啥也不会到可以胜任最基本的JavaWeb工作，推荐给新人的学习路线（二）
在上一节中,主要阐述了JavaScript方面的学习路线.先列举一下我朋友的经历,他去过培训机构,说是4个月后月薪过万,虽然他现在还未达到这个指标. 培训机构一般的套路是这样:先教JavaSE,什么都 ...
- JavaWeb——Servlet
一.基本概念 Servlet是运行在Web服务器上的小程序,通过http协议和客户端进行交互. 这里的客户端一般为浏览器,发送http请求(request)给服务器(如Tomcat).服务器接收到请求 ...
- JavaWeb——Listener
一.基本概念 JavaWeb里面的listener是通过观察者设计模式进行实现的.对于观察者模式,这里不做过多介绍,大概讲一下什么意思. 观察者模式又叫发布订阅模式或者监听器模式.在该模式中有两个角色 ...
- .JavaWeb文件上传和FileUpload组件使用
.JavaWeb文件上传 1.自定义上传 文件上传时的表单设计要符合文件提交的方式: 1.提交方式:post 2.表单中有文件上传的表单项:<input type="file" ...
- javaWeb应用打包
在Java中,使用"jar"命令来对将JavaWeb应用打包成一个War包,jar命令的用法如下:
- JavaWeb——tomcat安装及目录介绍
一.web web可以说,就是一套 请求->处理->响应 的流程.客户端使用浏览器(IE.FireFox等),通过网络(Network)连接到服务器上,使用HTTP协议发起请求(Reque ...
- 做JavaWeb开发不知Java集合类不如归家种地
Java作为面向对象语言对事物的体现都是以对象的形式,为了方便对多个对象的操作,就要对对象进行存储.但是使用数组存储对象方面具有一些弊端,而Java 集合就像一种容器,可以动态地把多个对象的引用放入容 ...
- JavaWeb基础学习体系与学习思路
对于JAVAWEB的学习,首先一定要明确的是学习整体框架和思路,要有一个把控.对于WEB,很多人认为是做网页,简单的把静态网页与JAVAWEB与网页设计一概而论. 拿起一本JS就开始无脑的学习,学了一 ...
- Eclipse下配置javaweb项目快速部署到tomcat
用惯了VS,再用Eclipse,完全有一种从自动挡到手动挡的感觉啊. 很多同学在Eclipse下开发web项目,每一次修改代码,看效果的时候都有右键项目->Run as -> Run on ...
随机推荐
- web集成高德地图
1.使用高德地图API需到官网添加一个Key,http://lbs.amap.com/dev/key/app 2.页面头引入 <div id="addressMap"> ...
- 如何通过Git GUI将自己本地的项目上传至Github（转）
githud是一个程序员以后成长都会使用到的,先不说很多优秀的开源框架都在这上面发布,光是用来管理自己的demo都已经让人感到很方便,用得也很顺畅.而真正让我下定决心使用github的原因是因为两次误 ...
- wordpress添加文章固定字段
让wordpress的文章数据表 增加一个字段,使其能在文章编辑页能编辑,并能通过rest api 获取出来. 例:给文章加一个缩略图字段 litpic 首先 通过mysql 给文章表 wp_post ...
- 延迟执行（Invoke 函数）和消息发送（SendMessage 函数）
Invoke 函数需要继承 MonoBehaviour 类后才能使用. Invoke(string str,float a):a 秒后执行名为 str 函数(只会调用一次). Invoke(strin ...
- _ZNote_Objective-C_用终端编译OC程序
某些情况下,仅仅想写一些简单的代码,可以不用Xcode,仅仅使用终端即可编译OC程序. 打开终端. 输入vi test.m 输入一下代码: #import <Foundation/Foundat ...
- 从零开始学习渗透Node.js应用程序
本文来源于i春秋学院,未经允许严禁转载 0x01 介绍 简单的说 Node.js 就是运行在服务端的 JavaScript.Node.js 是一个基于Chrome JavaScript 运行时建立的一 ...
- webpack中使用typescript
概述 这是我学习webpack中使用typescript的记录,供以后开发时参考,相信对其他人也有用. 学习typescript建议直接看中文文档或英文文档,休闲之余可以看这篇TypeScript 总 ...
- 学生管理系统(springMVC)
<Java Web编程>课程设计 ...
- Typescript 学习笔记七：泛型
中文网:https://www.tslang.cn/ 官网:http://www.typescriptlang.org/ 目录: Typescript 学习笔记一:介绍.安装.编译 Typescrip ...
- 递归打印目录层次(java版）
import java.io.File; public class Test { /** * * @param fileDir 根目录 * @param num 递归层次 */ private sta ...