3月15日 dom4j、JavaBean综合练习 图书管理系统
浏览数：34 /
时间：2015年06月08日
图书管理系统（由于只是为了练习dom4j,一些异常没有处理，还有些bug）
实现功能：
1.增：用户输入A，添加数据
2.删：用户输入D，删除数据
3.改：用户输入C，修改数据
4.查：用户输入F，根据id号查询数据
5.退出：输入exit
原理: JavaBean 技术写一个Book类
将数据存入Books.xml文件中
用户输入相应指令实质上就是通过dom4j技术修改xml中的数据
文件：
books.xml XML文件
Book.java 使用JavaBean技术描述
Add.java 实现添加功能
Change.java 修改数据
Delete.java 删除数据
Find.java 查询数据
XMLUtil.java 工具类
Main.java 主文件
代码：
1.books.xml
<?xml version="1.0" encoding="UTF-8"?>
<books>
<book id="b001">
<title>core java</title>
<price>34</price>
<author>qw</author>
</book>
<book id="b002">
<title>java world</title>
<price>91</price>
<author>er</author>
</book>
<book id="b003">
<title>my way</title>
<price>66</price>
<author>qw</author>
</book>
<book id="b004">
<title>javaee</title>
<price>45</price>
<author>ty</author>
</book>
<book id="b005">
<title>javascript</title>
<price>87</price>
<author>yu</author>
</book>
<book id="b006">
<title>news javese</title>
<price>36</price>
<author>ui</author>
</book>
<book id="b007">
<title>xml</title>
<price>192</price>
<author>io</author>
</book>
<book id="b008">
<title>sevlet</title>
<price>58</price>
<author>jh</author>
</book>
<book id="b009">
<title>dom4j</title>
<price>30</price>
<author>gb</author>
</book>
<book id="b010">
<title>thinking of java</title>
<price>60</price>
<author>fv</author>
</book>
2.Book.java
package my.system.bean;
public class Book {
private String id;
private String title;
private String price;
private String author;
public Book() {
super();
}
public Book(String id, String title, String price, String author) {
super();
this.id = id;
this.title = title;
this.price = price;
this.author = author;
}
@Override
public String toString() {
return "Book [id=" + id + ", title=" + title + ", price=" + price
+ ", author=" + author + "]";
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
}
3.Add.java
//传入参数，对数据进行添加
package my.system.tool;
import org.dom4j.Attribute;
import org.dom4j.Document;
import org.dom4j.DocumentHelper;
import org.dom4j.Element;
public class Add {
public static void add(Document document,String id,
String title,String price,String author)
{
//添加元素
Element newEle = DocumentHelper.createElement("book");
Element root = document.getRootElement();
root.add(newEle);
//添加id属性
Attribute attr = DocumentHelper.createAttribute(newEle, "id", id);
newEle.add(attr);
//添加子元素name,并赋值
Element newChild_name = DocumentHelper.createElement("title");
newEle.add(newChild_name);
newChild_name.setText(title);
//添加子元素price,并赋值
Element newChild_price = DocumentHelper.createElement("price");
newEle.add(newChild_price);
newChild_price.setText(price);
//添加子元素price,并赋值
Element newChild_author = DocumentHelper.createElement("author");
newEle.add(newChild_author);
newChild_author.setText(author);
}
}
4.Change.java
package my.system.tool;
import org.dom4j.Document;
import org.dom4j.Element;
public class Change {
public static void change(Document document,String id,String key,String value)
{
Element bookEle = (Element) document.selectSingleNode("//book[@id=‘"+id+"‘]");
Element keysEle = bookEle.element(key);
keysEle.setText(value);
}
}
5.Delete.java
package my.system.tool;
import org.dom4j.Document;
import org.dom4j.Element;
public class Delete {
//删除整本书
public static void deleteAll(Document document,String id)
{
Element bookEle = (Element) document.selectSingleNode("//book[@id=‘"+id+"‘]");
Element bookEleParent = bookEle.getParent();
bookEleParent.remove(bookEle);
}
}
6.Find.java
package my.system.tool;
import org.dom4j.Document;
import org.dom4j.Element;
public class Find {
public static Element findById(Document document,String id)
{
Element bookEle = (Element) document.selectSingleNode("//book[@id=‘"+id+"‘]");
return bookEle;
}
}
7.XMLUtil.java
package my.system.util;
import java.io.FileOutputStream;
import org.dom4j.Document;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
public class XMLUtil {
public static Document create() throws Exception
{
SAXReader reader = new SAXReader();
Document document = reader.read("book.xml");
return document;
}
public static void save(Document document) throws Exception
{
XMLWriter writer = new XMLWriter(new FileOutputStream("book.xml"));
writer.write(document);
writer.close();
}
}
8.Main.java
package my.system.main;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import org.dom4j.Document;
import my.system.tool.Add;
import my.system.tool.Change;
import my.system.tool.Delete;
import my.system.tool.Find;
import my.system.util.XMLUtil;
public class Main {
public static void main(String[] args) throws Exception {
//欢迎
System.out.println("欢迎进入图书管理系统！");
//选择操作：
System.out.println("请输入您要进行的操作指令：");
while(true)
{
System.out.println("添加数据：A \r\n删除数据：D \r\n修改数据：C \r\n查询数据：F \r\n退出：exit(不区分大小写)");
//创建流
BufferedReader bfw = new BufferedReader
(new InputStreamReader(System.in));
String line = bfw.readLine();
if("A".equalsIgnoreCase(line))
{
Document document = XMLUtil.create();
System.out.print("请输入书名：");
BufferedReader bfw_t = new BufferedReader
(new InputStreamReader(System.in));
String title = bfw_t.readLine();
System.out.print("设置价格:");
BufferedReader bfw_p = new BufferedReader
(new InputStreamReader(System.in));
String price = bfw_p.readLine();
System.out.print("作者：");
BufferedReader bfw_a = new BufferedReader
(new InputStreamReader(System.in));
String author = bfw_a.readLine();
System.out.print("请配置id：（注意，配置完毕以后将无法修改！！）");
BufferedReader bfw_i = new BufferedReader
(new InputStreamReader(System.in));
String id = bfw_i.readLine();
Add.add(document, id, title, price, author);
XMLUtil.save(document);
continue;
}
else if("D".equalsIgnoreCase(line))
{
Document document = XMLUtil.create();
System.out.println("请输入id号");
BufferedReader bfw_i = new BufferedReader
(new InputStreamReader(System.in));
String id = bfw_i.readLine();
Delete.deleteAll(document,id);
XMLUtil.save(document);
continue;
}
else if("C".equalsIgnoreCase(line))
{
Document document = XMLUtil.create();
System.out.print("请输入要修改的书籍的id:");
BufferedReader bfw_i = new BufferedReader
(new InputStreamReader(System.in));
String id = bfw_i.readLine();
System.out.println("输入要修改的项目：（书名（A）价格（B） 作者（C））");
BufferedReader bfw_k = new BufferedReader
(new InputStreamReader(System.in));
String key = bfw_k.readLine();
if(!("A".equalsIgnoreCase(key) ||"B".equalsIgnoreCase(key) ||"C".equalsIgnoreCase(key)))
{
System.out.println("数据错误！！程序自动停止！");
break;
}
else
{
System.out.println("输入相应的值：");
BufferedReader bfw_ = new BufferedReader
(new InputStreamReader(System.in));
String value = bfw_.readLine();
Change.change(document,id,key,value);
}
XMLUtil.save(document);
continue;
}
else if("F".equalsIgnoreCase(line))
{
Document document = XMLUtil.create();
System.out.println("请输入id号");
BufferedReader bfw_i = new BufferedReader
(new InputStreamReader(System.in));
String id = bfw_i.readLine();
Find.findById(document,id);
XMLUtil.save(document);
continue;
}
else if("exit".equalsIgnoreCase(line))
break;
else
{
System.out.println("指令错误，自动停止！");
}
}
}
}
package my.system.bean;
public class Book {
private String id;
private String title;
private String price;
private String author;
public Book() {
super();
}
public Book(String id, String title, String price, String author) {
super();
this.id = id;
this.title = title;
this.price = price;
this.author = author;
}
@Override
public String toString() {
return "Book [id=" + id + ", title=" + title + ", price=" + price
+ ", author=" + author + "]";
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
}
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