BlogJava-Kyle's Space-随笔分类-Code Templates

Jibx简单示例

王树东 — Mon, 28 Nov 2011 09:16:00 GMT

@import url(http://www.blogjava.net/CuteSoft_Client/CuteEditor/Load.ashx?type=style&file=SyntaxHighlighter.css);@import url(/css/cuteeditor.css);

首先从 JiBX 网站下载 JiBX，当前最新版本是 beta 3。解开下载的 zip 文件，里面有一个 lib 目录，包含了 bcel.jar, jibx-bind.jar, jibx-extras.jar, jibx-run.jar, xpp3.jar 五个 jar 文件。bcel.jar, jibx-bind.jar 只有在 binding compiler 的时候才用得到。jibx-extras.jar 是一个可选的工具包，里面有一些测试和验证的工具类。
1.定义一个我们将要处理 XML 文件，文件名为 data.xml，内容如下：

<customer>
<person>
  <cust-num>123456789cust-num>
  <first-name>Johnfirst-name>
  <last-name>Smithlast-name>
person>
<street>12345 Happy Lanestreet>
<city>Plunkcity>
<state>WAstate>
<zip>98059zip>
<phone>888.555.1234phone>
customer>

这个 XML 文件非常简单，共有十个元素，没有属性。根元素 customer 有 person, street, city, state, zip, phone 六个子元素。其中元素 person 有 cust-num, first-name, last-name 三个子元素。
2.接着定义两个 Java 类 Customer 和 Person，也采用最简单的方式，用对象的域值对应元素，内容如下：

public class Customer {
  public Person person;
  public String street;
  public String city;
  public String state;
  public Integer zip;
  public String phone;
}

public class Person {
  public int customerNumber;
  public String firstName;
  public String lastName;
}

这个两个类没有任何方法，够简单吧！或许你已经看出来了，Customer 类的七个 field 对应的是 XML 文件中 customer 元素的七个子元素。Person 类的三个 field 对应的是 person 元素的三个子元素。在 Person 类的 field 的名称并不是和 person 元素的子元素名称完全相等，这是遵守 Java 编程规范 field 命名的需要，虽然不相等，但这不重要，可以在绑定定义文挡中把它们一一对应起来。
3.绑定定义文挡
绑定定义文挡是依据绑定定义规范将 XML 数据和 Java 对象绑定的 XML 文挡。文件名为 binding.xml，内容如下：

binding.xml 文件中的 name 和 field 属性分别将 XML 中的元素和 Java 对象中的 field 一一对应并绑定起来。

mapping 元素的 name 和 class 属性将 customer 根元素和 Customer 类绑定在一起。

public Person person;
上面两行定义了 person 是 Customer 的 field，同时也把 person 元素和 person 类绑定在一起。

<binding>
<mapping name="customer" class="Customer">
  <structure name="person" field="person">
   <value name="cust-num" field="customerNumber"/>
   <value name="first-name" field="firstName"/>
   <value name="last-name" field="lastName"/>
  structure>
  <value name="street" field="street"/>
  <value name="city" field="city"/>
  <value name="state" field="state"/>
  <value name="zip" field="zip"/>
  <value name="phone" field="phone"/>
mapping>
binding>

4.执行 Binding Compiler 过程
以下命令是在 Linux 下执行，如果是 Windows 平台请转换成相应的命令

#javac Person.java
#javac -classpath . Customer.java
#java -jar lib/jibx-bind.jar binding.xml

执行完后，在当前目录多了四个 class 文件，分别是 Person.class, Customer.class, JiBX_bindingCustomer_access.class, JiBX_bindingFactory.class。
5.执行 binding runtime 过程
接着写一个简单的读取 data.xml 测试程序 Test.java，内容如下：

import java.io.FileInputStream;
import java.io.FileNotFoundException;

import org.jibx.runtime.JiBXException;
import org.jibx.runtime.IBindingFactory;
import org.jibx.runtime.BindingDirectory;
import org.jibx.runtime.IUnmarshallingContext;

class Test {
  public static void main(String[] args) {
  try{
    IBindingFactory bfact = BindingDirectory.getFactory(Customer.class);
    IUnmarshallingContext uctx = bfact.createUnmarshallingContext();
    Customer customer = (Customer)uctx.unmarshalDocument(new FileInputStream("data.xml"), null);
    Person person = customer.person;

    System.out.println("cust-num:" + person.customerNumber);
    System.out.println("first-name:" + person.firstName);
    System.out.println("last-name:" + person.lastName);
    System.out.println("street:" + customer.street);
  }catch(FileNotFoundException e){
    System.out.println(e.toString());
  }catch(JiBXException e){
    System.out.println(e.toString());
  }
}
}

编译并运行这个测试程序

#javac -classpath .:lib/jibx-run.jar Test.java
#java -cp .:lib/jibx-run.jar:lib/xpp3.jar Test

程序运行的结果是

cust-num:123456789
first-name:John
last-name:Smith
street:12345 Happy Lane

王树东 2011-11-28 17:16 发表评论

压缩文件以及文件夹

王树东 — Fri, 22 Jul 2011 04:55:00 GMT

@import url(http://www.blogjava.net/CuteSoft_Client/CuteEditor/Load.ashx?type=style&file=SyntaxHighlighter.css);@import url(/css/cuteeditor.css);

//使用Groovy 稍微改了下
import java.io.File;
import java.io.FileInputStream;
import java.util.zip.GZIPOutputStream
import java.util.zip.ZipEntry
import java.util.zip.ZipOutputStream

class Compress {

    public static gzipFile(from,to) throws IOException{
        def inFile = new FileInputStream(from);
        def out = new GZIPOutputStream(new FileOutputStream(to));
        byte[] buffer = new byte[4096];
        def buffer_read = 0;
        while((buffer_read = inFile.read(buffer)) != -1){
//            out.write(buffer,0,buffer_read);//use '<<' replace
            out << buffer;//use '<<' replace
        }
        inFile.close();
        out.close();
    }

    public static zipDirectory(dir,zipFile){
        File dire = new File(dir);
        if(!dire.isDirectory()){
            throw new IllegalArgumentException('Compress: not a directory:' + dir);
        }
        String[] entries = dire.list();
        byte[] buffer = new byte[4096];
        int bytes_read;

        ZipOutputStream out = new ZipOutputStream(new FileOutputStream(zipFile));

        entries.each{item ->
            File f = new File(dire,item);
            if(f.isDirectory()){
                return ;
            }
            FileInputStream in_file = new FileInputStream(f);
            ZipEntry entry = new ZipEntry(f.getPath());
            out.putNextEntry (entry);
            while((bytes_read = in_file.read(buffer)) != -1){
                out << buffer;
            }
            in_file.close();
        }
        out.close();
    }

    static main(args) {
        def from = args[0];
        File from_file = new File(from);
        def directory = from_file.isDirectory();
        def to = '';
        if(directory){
            to = from + '.zip';
        }else{
            to = from + '.gz';
        }

        if((new File(to)).exists()){
            println('Compress: won\'t overwrite existing file:' + to);
            System.exit(0);
        }
        if(directory)
            Compress.zipDirectory (from, to);
        else
            Compress.gzipFile from, to;
    }
}

王树东 2011-07-22 12:55 发表评论

对Java File类的操作-- delete

王树东 — Thu, 07 Jul 2011 05:13:00 GMT

@import url(http://www.blogjava.net/CuteSoft_Client/CuteEditor/Load.ashx?type=style&file=SyntaxHighlighter.css);@import url(/css/cuteeditor.css);

执行File.delete()时最好做一系列的验证。

import java.io.File;
public class Delete {
    public Delete() {
        // TODO Auto-generated constructor stub
    }
    /**
     * @param args
     */
    public static void main(String[] args) {
        if(args.length != 1){
            System.err.println("Usage:java Delete");
            System.exit(0);
        }

        try{
            delet1e(args[0]);
        }catch(IllegalArgumentException e){
            System.err.println(e.getMessage());
        }
    }
    private static void delet1e(String fileName) {
        File f = new File(fileName);
        if(!f.exists())
            fail("Delete:no such file or firectory:" + fileName);
        if(!f.canWrite())
            fail("Delete:write protected :" + fileName);
        if(f.isDirectory()){
            String[] files = f.list();
            if(files.length > 0)
                fail("Delete:directory not empty:" + fileName);
        }
        boolean success = f.delete();
        if(!success)
            fail("Delete: delete failed");
    }
    private static void fail(String msg)throws IllegalArgumentException {
        // TODO Auto-generated method stub
        throw new IllegalArgumentException(msg);
    }
}

王树东 2011-07-07 13:13 发表评论

Java Object 序列化成XML以及XML反序列化成Java Object

王树东 — Mon, 04 Jul 2011 12:55:00 GMT

@import url(http://www.blogjava.net/CuteSoft_Client/CuteEditor/Load.ashx?type=style&file=SyntaxHighlighter.css);@import url(/css/cuteeditor.css);

package org.sl.bean;

import java.beans.XMLDecoder;
import java.beans.XMLEncoder;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Serializable;

public class ObjectXmlSerial {

    public static void main(String[] args) throws IOException{
        UserBean user = new UserBean();
        OtherUserInfoBean otherUserInfo = new OtherUserInfoBean();

        otherUserInfo.setAddress("汉字");
        otherUserInfo.setEmail("test@test.com");

        user.setName("hello");
        user.setPassword("world");

        user.setOtherUserInfo(otherUserInfo);

        ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
        BufferedOutputStream bufferOut = new BufferedOutputStream(byteArrayOut);

        writeObjectToXML(bufferOut, user);
        byte[] bys = byteArrayOut.toByteArray();

        byteArrayOut.close();
        bufferOut.close();


        ByteArrayInputStream byteArrayIn = new ByteArrayInputStream(bys);
        BufferedInputStream bufferIn = new BufferedInputStream(byteArrayIn);

        UserBean user1 = readObjectFromXML(bufferIn);

        byteArrayIn.close();
        bufferIn.close();

        System.out.println(user1.getName());
        System.out.println(user1.getOtherUserInfo().getAddress());
    }

    public static void writeObjectToXML(OutputStream out, T obj){
        XMLEncoder xmlEncoder = null;

        try{
            xmlEncoder = new XMLEncoder(out);
            xmlEncoder.writeObject(obj);
        }finally{
            if(null != xmlEncoder)
                xmlEncoder.close();
        }
    }

    @SuppressWarnings("unchecked")
    public static T readObjectFromXML(InputStream in){
        T obj = null;
        XMLDecoder xmlDecoder = null;

        try{
            xmlDecoder = new XMLDecoder(in);
            obj = (T) xmlDecoder.readObject();
        }finally{
            if(null != xmlDecoder)
                xmlDecoder.close();
        }
        return obj;
    }
}

王树东 2011-07-04 20:55 发表评论