xml的通讯录系统

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缺点是一开始做的做的时候没有考虑到面向对象并没有写出一个Contact类把所有的联系人封装到对象中.

Demo1.java

package cn.itcast.dom4j;import org.dom4j.Document;import org.dom4j.Element;import org.dom4j.io.OutputFormat;import org.dom4j.io.SAXReader;import org.dom4j.io.XMLWriter;import java.io.File;import java.io.FileOutputStream;import java.util.List;import java.util.Scanner;/** * Created by LiJing on 2017/9/4. */public class Demo1 {    static Document document = null ;    static File file =new File("./contact.xml");    public static void main(String[] args) throws Exception{        while(true) {            init();            select();            write();        }    }    //初始化    public static void init()throws Exception{        document = new SAXReader().read(file);        System.out.println("*************************************");        System.out.println("* 1 . 添加联系人                    *");        System.out.println("* 2 . 修改联系人                    *");        System.out.println("* 3 . 删除联系人                    *");        System.out.println("* Q . 查询所有联系人                *");        System.out.println("*************************************");    }    public static void select() throws Exception{        Scanner scanner = new Scanner(System.in);        String select = "";        if(scanner.hasNext()){            select = scanner.next();        }        if("1".equals(select)){            //添加联系人            add();        }else if("2".equals(select)){            //修改联系人            gai();        }else if("3".equals(select)){            //删除联系人            String id = null;            System.out.println("请输入要删除的ID");            Scanner scanner1  =  new Scanner(System.in);            if(scanner1.hasNext()){                id = scanner1.next();            }            del(id);        }else if("q".equalsIgnoreCase(select)) {            //查询所有联系人            getAll();        }else{            System.out.println("您的输入有误");        }    }    //增加联系人    public static void add() throws Exception{        Scanner scanner = new Scanner(System.in);        String text = null;        Element rootElem = document.getRootElement();        Element contactElem = rootElem.addElement("contact");        Element idElem = contactElem.addElement("id");        System.out.println("请输入编号");        if(scanner.hasNext()){            text = scanner.next();        }        contactElem.attribute("id").setText(text);        Element nameElem = contactElem.addElement("name");        System.out.println("请输入姓名");        if(scanner.hasNext()){            text = scanner.next();        }        nameElem.addText(text);        Element sexElem = contactElem.addElement("sex");        System.out.println("请输入性别");        if(scanner.hasNext()){            text = scanner.next();        }        sexElem.addText(text);        Element ageElem = contactElem.addElement("age");        System.out.println("请输入年龄");        if(scanner.hasNext()){            text = scanner.next();        }        ageElem.addText(text);        Element phoneElem = contactElem.addElement("phone");        System.out.println("请输入手机号");        if(scanner.hasNext()){            text = scanner.next();        }        phoneElem.addText(text);        Element emailElem = contactElem.addElement("email");        System.out.println("请输入邮箱");        if(scanner.hasNext()){            text = scanner.next();        }        emailElem.addText(text);        Element qqElem = contactElem.addElement("qq");        System.out.println("请输入QQ");        if(scanner.hasNext()){            text = scanner.next();        }        qqElem.addText(text);        System.out.println("添加成功");    }    public static void del(String id){        Element rootElem = document.getRootElement();        List<Element> list = rootElem.elements();        for(Element element:list){            if(element.element("id").getText().equals(id)){                element.detach();            }        }        System.out.println("删除成功");    }    public static void gai() throws Exception {        String text = null;        String id = null ;        System.out.println("请输入要修改的ID");        Scanner scanner = new Scanner(System.in);        if(scanner.hasNext()){            id =  scanner.next();        }        Element contactElem = (Element) document.selectSingleNode("//contact[@id=" + id + "]");        Element nameElem = contactElem.element("name");        System.out.println("请输入姓名");        if(scanner.hasNext()){            text = scanner.next();        }        nameElem.setText(text);        Element sexElem = contactElem.element("sex");        System.out.println("请输入性别");        if(scanner.hasNext()){            text = scanner.next();        }        sexElem.setText(text);        Element ageElem = contactElem.element("age");        System.out.println("请输入年龄");        if(scanner.hasNext()){            text = scanner.next();        }        ageElem.setText(text);        Element phoneElem = contactElem.element("phone");        System.out.println("请输入手机号");        if(scanner.hasNext()){            text = scanner.next();        }        phoneElem.addText(text);        Element emailElem = contactElem.element("email");        System.out.println("请输入邮箱");        if(scanner.hasNext()){            text = scanner.next();        }        emailElem.setText(text);        Element qqElem = contactElem.element("qq");        System.out.println("请输入QQ");        if(scanner.hasNext()){            text = scanner.next();        }        qqElem.setText(text);        System.out.println("修改成功");    }    public static void write() throws Exception{        //设置输出路径        FileOutputStream fileOutputStream = new FileOutputStream(file);        //美观输出        OutputFormat format = OutputFormat.createPrettyPrint();        //编码        format.setEncoding("utf-8");        //创建        XMLWriter writer = new XMLWriter(fileOutputStream,format);        //写出        writer.write(document);    }    //获取所有联系人    public static void getAll(){        String xpath = "//contact";        List<Element> list =document.selectNodes(xpath);        System.out.println("编号  姓名      性别      年龄          电话            邮箱                        QQ");        for(Element element:list){            //获取到的是tr节点 然后获取子节点的文本 需要强转            System.out.print(element.attributeValue("id"));            System.out.print("    "+((Element) element.elements().get(0)).getText());            System.out.print("    " + ((Element) element.elements().get(1)).getText());            System.out.print("     "+((Element)element.elements().get(2)).getText());            System.out.print("       " + ((Element) element.elements().get(3)).getText());            System.out.print("             " + ((Element) element.elements().get(4)).getText());            System.out.println("    "+((Element)element.elements().get(5)).getText());;        }    }}

contact.xml

<?xml version="1.0" encoding="utf-8"?><contactList>   <contact id="001">     <name>lijing</name>      <sex>nna</sex>      <age>14</age>      <phone>1232224451</phone>      <email>123@123.com</email>      <qq>123456</qq>   </contact>    <contact id="002">     <name>张三</name>      <sex>男</sex>      <age>18</age>      <phone>123111123123123123</phone>      <email>158274@qq.com</email>      <qq>123444444</qq>   </contact> </contactList>

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