数据绑定：
数据绑定是将用户输入绑定到领域对象模型的一种特性。
数据绑定的好处：
1.帮助解析字符串，转换成相应的数据类型
2.另一个好处，在进行输入验证时（数据绑定与数据验证知识点结合使用）：当输入验证失败时，它会重新生成一个HTML表单。手工编写HTML代码时,必须记住之前输入的值，重新填入输入的字段。有了Spring的数据绑定和表单标签库后，他们就会替你完成这些工作。
下面只是展示数据绑定部分：
1.目录结构
2.domain类
Book类
package domain;
public class Book {
//书的id号
private long id;
//书的国际编号
private String isbn;
//书的名称
private String title;
//书的类别
private Category category;
//书的作家
private String author;
//书的价格
private double price;
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public Book() {
super();
}
public Book(long id, String isbn, String title, Category category, String author, double price) {
super();
this.id = id;
this.isbn = isbn;
this.title = title;
this.category = category;
this.author = author;
this.price = price;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getIsbn() {
return isbn;
}
public void setIsbn(String isbn) {
this.isbn = isbn;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Category getCategory() {
return category;
}
public void setCategory(Category category) {
this.category = category;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
}Category类：（注：category 意思：类别）
package domain;
//类别类
public class Category {
private int id;
private String name;
public Category() {
super();
// TODO Auto-generated constructor stub
}
public Category(int id, String name) {
super();
this.id = id;
this.name = name;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}3.Controller类：
package Controller;
import java.util.List;
import org.apache.commons.logging.Log;
/*
* <!-- 书的作家 -->
<!-- <td>${book.Author }</td>-->
*/
import org.apache.commons.logging.LogFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import domain.Book;
import domain.Category;
import service.BookService;
@Controller
public class bookController {
//通过依赖注入
@Autowired
private BookService bookservice;
private static final Log logger=LogFactory.getLog(bookController.class);
//--------------------------图书展示部分---------------------
/*
* 图书表单展示
*/
@RequestMapping(value="/listBook")
String bookList(Model model) {
model.addAttribute("books",bookservice.getBooks());
model.addAttribute("book",new Book());
return "BookList";
}
//------------------------图书表单添加部分---------------------
/*
* 图书添加表单
*/
@RequestMapping(value="/inputBook")
String addBook(Model model){
model.addAttribute("categorys", bookservice.getAllCategorys());
model.addAttribute("book",new Book());
return "BookAddForm";
}
/*
* 图书保存
*/
@RequestMapping(value="/bookSave")
String bookSave(@ModelAttribute Book book) {
//获取图书类别
Category category=bookservice.getCategoryById(book.getCategory().getId());
//添加图书类别
book.setCategory(category);
//获取当前最大编号
long num=bookservice.getnum()+1;
//设置图书编号
book.setId(num);
//保存图书
bookservice.save(book);
return "redirect:/listBook";
}
//-------------------------图书更新部分----------------------
/*
* 图书编辑
*/
@RequestMapping(value="/edit/{id}")
String edit(Model model,@PathVariable Long id) {
//获取图书类别
List<Category> categorys=bookservice.getAllCategorys();
model.addAttribute("categorys",categorys);
//获取图书
Book book=bookservice.getBookById(id);
model.addAttribute("book",book);
return "BookEditForm";
}
/*
* 图书更新
*/
@RequestMapping(value="/edit/update")
String update(@ModelAttribute Book book) {
//通过浏览器传来的类型编号获取图书类型编号
int n=book.getCategory().getId();
Category category=bookservice.getCategoryById(n);
book.setCategory(category);
//进行图书更新
System.out.println("ojidgjkgm");
System.out.println(book.getId());
bookservice.update(book);
//设置图书类型
return "redirect:/listBook";
}
}
4.Service类:
接口：
package service;
import java.util.List;
import domain.Book;
import domain.Category;
/*
* 接口为表单提书籍服务
* 包括增删改查
*/
public interface BookServiceInf {
//---------书籍类别-------------
//获取所有书籍类型对象
List<Category> getAllCategorys();
//获取Category
Category getCategoryById(int n);
//--------- 书籍 ----------------
//获取所有书籍
List<Book> getBooks();
//书籍添加
Book save(Book book);
//获取当前编号
Long getnum();
//书籍更新
Book update(Book book);
//获取书籍编号
int getId();
//通过编号获取书籍
Book getBookById(Long id);
}BookService类：
package service;
import java.util.ArrayList;
import java.util.List;
import org.springframework.stereotype.Service;
import domain.Book;
import domain.Category;
@Service
public class BookService implements BookServiceInf{
//目录表
List<Category> categorys=new ArrayList<Category>();
//书籍表
List<Book> bookList=new ArrayList<Book>();
public BookService() {
Category c1=new Category(1, "computer");
Category c2=new Category(2, "economics");
Category c3=new Category(3,"law");
categorys.add(c1);
categorys.add(c2);
categorys.add(c3);
bookList.add(new Book(1, "9780980839623", "jsp", c1, "budi",56.9));
bookList.add(new Book(2, "9780980839624", "spring mvc", c1, "moke",45));
bookList.add(new Book(3, "9780980839625", "IBM", c2, "chaozong",78));
bookList.add(new Book(4, "9780980839626", "manage", c2, "yangzong",89));
}
@Override
public List<Category> getAllCategorys() {
return categorys;
}
@Override
public List<Book> getBooks() {
return bookList;
}
@Override
public Book save(Book book) {
bookList.add(book);
return book;
}
@Override
public Book update(Book book) {
Long bookNumber=book.getId();
for (int i = 0; i < bookList.size(); i++) {
if(bookList.get(i).getId()==book.getId()) {
bookList.set(i, book);
}
}
// for (Book book2 : bookList) {
// if(book2.getId()==bookNumber) {
// System.out.println("匹配成功！！！");
// bookList.set((int)bookNumber, book);
// }
// }
return null;
}
@Override
public int getId() {
// TODO Auto-generated method stub
return 0;
}
@Override
public Category getCategoryById(int n) {
for (Category category : categorys) {
if(category.getId()==n) {
return category;
}
}
return null;
}
@Override
public Long getnum() {
return (long) bookList.size();
}
@Override
public Book getBookById(Long n) {
System.out.println(n);
for (Book book : bookList) {
if(book.getId()==n) {
return book;
}
}
return null;
}
}4.配置
web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0"
metadata-complete="true">
<servlet>
<servlet-name>springmvc</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>/WEB-INF/config/springmvc-config.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springmvc</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
</web-app>
springmvc-config.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.3.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.3.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.3.xsd">
<context:component-scan base-package="Controller"/>
<context:component-scan base-package="service"/>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<!-- 前缀 -->
<property name="prefix" value="/WEB-INF/jsp/"></property>
<!-- 后缀 -->
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
5.JSP页面
BookList页面
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!-- JSTL声明 -->
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ page isELIgnored="false" %>
<!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=ISO-8859-1">
<title>Book List</title>
</head>
<body>
<h1>Book List</h1>
<a href="<c:url value="/inputBook"/>">Add a book</a>
<table>
<!--表头 -->
<tr>
<!-- 书的类别 -->
<th>Category</th>
<!-- 书的名称 -->
<th>Title</th>
<!-- 书的国际编号 -->
<th>Isbn</th>
<!--书的作家 -->
<th>Author</th>
</tr>
<c:forEach items="${books }" var="book">
<tr>
<!-- 书的类名 -->
<td>${book.category.name}</td>
<!-- 书的名称 -->
<td>${book.title }</td>
<!-- 书的国际编号 -->
<td>${book.isbn }</td>
<!-- 书的作家 -->
<td>${book.author }</td>
<!-- 书的价格 -->
<td>${book.price }</td>
<td><a href="edit/${book.id }">Edit</a></td>
</tr>
</c:forEach>
</table>
</body>
</html>BookAddForm页面
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<!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>Add a book</title>
</head>
<!--书的属性包括：书的类别，书的名称，书的国际编码，书的作家 -->
<body>
<form:form commandName="book" action="bookSave" method="post">
<fieldset>
<legend>Add a book</legend>
<table>
<!-- 书的类别 -->
<tr>
<td><label>category:</label></td>
<!-- 书的类别进行选择输入 -->
<td><form:select
id="category"
path="category.id"
items="${categorys }"
itemLabel="name"
itemValue="id"
/>
</td>
</tr>
<!-- 书的名称 -->
<tr>
<td><label>Title:</label></td>
<td><form:input id="title" type="text" path="title"/></td>
</tr>
<!-- 书的国际编码 -->
<tr>
<td><label>Isbn:</label></td>
<td><form:input id="isbn" type="text" path="isbn"/></td>
</tr>
<!-- 书的作家 -->
<tr>
<td><label>Author:</label></td>
<td><form:input id="author" type="text" path="author"/></td>
</tr>
<!-- 书的价格 -->
<tr>
<td><label>Price:</label></td>
<td><form:input id="price" type="text" path="price"/></td>
</tr>
</table>
<input type="reset"/>
<input type="submit"/>
</fieldset>
</form:form>
</body>
</html>BookEditForm页面
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<%@ taglib prefix="form" uri="http://www.springframework.org/tags/form"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Edit a book</title>
</head>
<!--书的属性包括：书的类别，书的名称，书的国际编码，书的作家 -->
<body>
<form:form commandName="book" action="update" method="post">
<fieldset>
<legend>Edit a book</legend>
<form:hidden id="id" path="id"/>
<table>
<!-- 书的类别 -->
<tr>
<td><label>category:</label></td>
<!-- 书的类别进行选择输入 -->
<td><form:select
path="category.id"
items="${categorys }"
itemLabel="name"
itemValue="id"
/></td>
</tr>
<!-- 书的名称 -->
<tr>
<td><label>title:</label></td>
<td><form:input id="title" type="text" path="title"/></td>
</tr>
<!-- 书的国际编码 -->
<tr>
<td><label>Isbn:</label></td>
<td><form:input id="isbn" type="text" path="isbn"/></td>
</tr>
<!-- 书的作家 -->
<tr>
<td><label>Author:</label></td>
<td><form:input id="author" type="text" path="author"/></td>
</tr>
<!-- 书的价格 -->
<tr>
<td><label>Price:</label></td>
<td><form:input type="text" id="price" path="price"/></td>
</tr>
</table>
<input type="reset"/>
<input type="submit"/>
</fieldset>
</form:form>
</body>
</html>6.结果截图：
图书列表：
图书添加列表：
图书添加完成列表：
图书编辑列表：
编辑之后：
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