xml 操作

其他 2018-06-01 12:00:00 阅读次数: 0

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
   
   >

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