xml 操作

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下面是对xml实现CRUD的实例

JaxpXMLUtil.java

package com.braden.util;

import java.io.File;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class JaxpXMLUtil {
    String path = "";

    public JaxpXMLUtil(String path) {
        this.path = path;
    }

    public Document getDocument() {
        DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
        DocumentBuilder builder;
        Document document = null;
        try {
            builder = factory.newDocumentBuilder();
            document = builder.parse(path);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return document;

    }

    public boolean writeToXml(Document document, String path) {
        boolean flag = false;
        TransformerFactory tFactory = TransformerFactory.newInstance();

        try {
            Transformer tf = tFactory.newTransformer();
            if (path != null && path != "") {
                tf.transform(new DOMSource(document), new StreamResult(
                        new File(path)));
                flag = true;
            } else {
                flag = false;
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
        return flag;
    }

    public String getId() {
        Document document = this.getDocument();
        NodeList list = document.getDocumentElement().getChildNodes();
        int id = 1;
        if (list != null) {
            int len = list.getLength();
            for (int i = 0; i < len; i++) {
                Node node = list.item(i);
                if (node.getNodeType()==Node.ELEMENT_NODE) {
                    id++;
                }
            }
        }
        return id+"";
    }
}

UserDaoImpl.java




package com.braden.impl;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import com.braden.dao.UserDao;
import com.braden.domain.User;
import com.braden.util.JaxpXMLUtil;

public class UserDaoImpl implements UserDao {

    JaxpXMLUtil util = null;

    public UserDaoImpl() {
        util = new JaxpXMLUtil("src/user.xml");
    }

    public boolean delete(String id) {
        boolean flag = false;
        Document document = util.getDocument();
        NodeList user_list = document.getElementsByTagName("user");
        for (int i = 0; i < user_list.getLength(); i++) {
            Element e = (Element) user_list.item(i);
            if (e.getAttribute("id").equals(id)) {
                Node node = user_list.item(i);
                e.getParentNode().removeChild(node);
                util.writeToXml(document, "src/user.xml");
                flag = true;
            }
        }
        return flag;

    }

    public User find(String id) {
        Document document = util.getDocument();
        NodeList user_list = document.getElementsByTagName("user");
        User user = null;
        for (int i = 0; i < user_list.getLength(); i++) {
            Element e = (Element) user_list.item(i);
            if (e.getAttribute("id").equals(id)) {
                user = new User();
                Node addressNode = e.getElementsByTagName("address").item(0);
                Node bitthdayNode = e.getElementsByTagName("bitthday").item(0);
                Node genderNode = e.getElementsByTagName("gender").item(0);
                Node usernameNode = e.getElementsByTagName("username").item(0);
                Node passwordNode = e.getElementsByTagName("password").item(0);
                user.setAddress(addressNode.getTextContent());
                user.setBitthday(bitthdayNode.getTextContent());
                user.setGender(genderNode.getTextContent());
                user.setUsername(usernameNode.getTextContent());
                user.setPassword(passwordNode.getTextContent());
                break ;
            }
        }
        return user;
    }

    public boolean update(String id, String updateitem, String updateinfo) {
        boolean flag = false;
        Document document = util.getDocument();
        NodeList user_list = document.getElementsByTagName("user");
        for (int i = 0; i < user_list.getLength(); i++) {
            Element e = (Element) user_list.item(i);
            if (e.getAttribute("id").equals(id)) {
                NodeList user_child_List = e.getChildNodes();
                for (int j = 0; j < user_child_List.getLength(); j++) {
                    Node node_item = user_child_List.item(j);
                    if (node_item.getNodeName().equals(updateitem)) {
                        if (!node_item.getTextContent().equals(updateinfo)) {
                            node_item.setTextContent(updateinfo);
                            util.writeToXml(document, "src/user.xml");
                            flag = true;
                        }

                    }
                }
            }

        }

        return flag;
    }

    public boolean insert(User user) {

        Document document = util.getDocument();
        /* System.out.println(document.getDocumentURI()); */
        Element node_user = document.createElement("user");
        node_user.setAttribute("id", user.getId());
        Element node_username = document.createElement("username");
        node_username.setTextContent(user.getUsername());
        Element node_id = document.createElement("id");
        node_id.setTextContent(user.getId());
        Element node_gender = document.createElement("gender");
        node_gender.setTextContent(user.getGender());
        Element node_password = document.createElement("password");
        node_password.setTextContent(user.getPassword());
        Element node_bitthday = document.createElement("bitthday");
        node_bitthday.setTextContent(user.getBitthday());
        Element node_address = document.createElement("address");
        node_address.setTextContent(user.getAddress());
        node_user.appendChild(node_username);
        node_user.appendChild(node_bitthday);
        node_user.appendChild(node_address);
        node_user.appendChild(node_gender);
        node_user.appendChild(node_password);
        document.getDocumentElement().appendChild(node_user);

        try {
            util.writeToXml(document, "src/user.xml");
            return true;
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

    }

}

UserDaoImplTest.java

package com.braden.junit; import java.io.IOException; import javax.xml.parsers.ParserConfigurationException; import org.junit.After; import org.junit.AfterClass; import org.junit.Before; import org.junit.BeforeClass; import org.junit.Test; import org.xml.sax.SAXException; import com.braden.dao.UserDao; import com.braden.domain.User; import com.braden.impl.UserDaoImpl; import com.braden.util.JaxpXMLUtil; public class UserDaoImplTest { static UserDao dao; static JaxpXMLUtil util; @BeforeClass public static void setUpBeforeClass() throws Exception { dao = new UserDaoImpl(); util = new JaxpXMLUtil("src/user.xml"); } @AfterClass public static void tearDownAfterClass() throws Exception { } @Before public void setUp() throws Exception { } @After public void tearDown() throws Exception { } @Test public void testDelete() { if (dao.delete("2")) { System.out.println("删除成功"); } else { System.out.println("删除失败"); } } @Test public void testFind() { User user = dao.find("2"); if (user!=null) { System.out.println(user.getPassword()); } else { System.out.println("用户不存在"); } } @Test public void testUpdate() { if(dao.update("2", "password","lina")) { System.out.println("更新成功"); } else { System.out.println("更新失败"); } } @Test public void testInsert() throws SAXException, IOException, ParserConfigurationException { String id =util.getId(); User user = new User(); user.setAddress("beijing"+id+"beijing"); user.setBitthday("1984-09-03"); user.setId(id); user.setUsername("braden_"+id); user.setGender("female"); user.setPassword("123456"); try { dao.insert(user); System.out.println("user" + user.getId()+"添加成功！"); } catch (Exception e) { throw new RuntimeException(e); } } }

User.java


package com.braden.domain;

public class User {
    private String username;
    private String id;
    private String bitthday;
    private String address;
    private String gender;
    private String password;
    public User() {
        super();
    }
    public User(String username, String id, String bitthday, String address,
            String gender, String password) {
        super();
        this.username = username;
        this.id = id;
        this.bitthday = bitthday;
        this.address = address;
        this.gender = gender;
        this.password = password;
    }
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getBitthday() {
        return bitthday;
    }
    public void setBitthday(String bitthday) {
        this.bitthday = bitthday;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    public String getPassword() {
        return password;
    }
    public void setPassword(String password) {
        this.password = password;
    }
    
    
}

得到的xml文件


<?xml version="1.0" encoding="UTF-8" standalone="no"?><!-- <!DOCTYPE user PUBLIC "//UNKNOWN/" "user.dtd"> -->
<users>
<user id="1">
<username>braden_1</username>
<bitthday>1984-09-03</bitthday>
<address>beijing1beijing</address>
<gender>female</gender>
<password>123456</password>
</user>
<user id="2">
<username>braden_2</username>
<bitthday>1984-09-03</bitthday>
<address>beijing2beijing</address>
<gender>female</gender>
<password>123456</password>
</user>
<user id="3">
<username>braden_3</username>
<bitthday>1984-09-03</bitthday>
<address>beijing3beijing</address>
<gender>female</gender>
<password>123456</password>
</user>
</users>