cxf学习笔记之传递附件 - ll_feng - ITeye技术网站

注意事项
1、服务端和客户端的数据对象中，用来存储附件的属性都要用“@XmlMimeType("application/octet-stream")”进行注解，如下：

Java代码  
@XmlMimeType("application/octet-stream")  
private DataHandler photo;  

2、服务端和客户端的web服务配置都要声明mtom-enabled=true
服务端如果在spring中配置，如下：

Java代码  
<jaxws:endpoint id="register"  implementor="cn.ibeans.ws.impl.RegisterWebServiceImpl" address="/ws/register">  
    <jaxws:properties>  
        <entry key="mtom-enabled" value="true"/>    
    </jaxws:properties>  
</jaxws:endpoint>  

客户端，如果用代码配置（也可用spring配置，类似服务端），如下：

Java代码  
Map<String,Object> map = new HashMap<String,Object>();  
map.put("mtom-enabled", true);  
factory = new JaxWsProxyFactoryBean();  
factory.setProperties(map);  
 
 
 

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标签 : webservice

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IT瘾于2013年10月9日下午03时16分00秒发布 #

3 ways to read files using Java NIO | How to do in JAVA

New I/O, usually called NIO, is a collection of APIs that offer additional capabilities for intensive I/O operations. It was introduced with the Java 1.4 release by Sun Microsystems to complement an existing standard I/O. The extended NIO that offers further new file system APIs, called NIO2, was released with Java SE 7 (“Dolphin”).

NIO related questions are very popular in java interviews now-a-days.

NIO2 provides two major methods of reading a file:

Using buffer and channel classes
Using Path and Files classes

In this post, I am showing a couple of ways to read a file from file system. So lets start them by first showing old famous approach first, so that we can see what really changed.

Old famous I/O way

This example shows how we have been reading a text file using old I/O library APIs. It uses a BufferedReader object for reading. Another way can be using InputStream implementation.

package com.howtodoinjava.test.nio;
 
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
 
public class WithoutNIOExample
{
    public static void main(String[] args)
    {
        BufferedReader br = null;
        String sCurrentLine = null;
        try
        {
            br = new BufferedReader(
            new FileReader("test.txt"));
            while ((sCurrentLine = br.readLine()) != null)
            {
                System.out.println(sCurrentLine);
            }
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        finally
        {
            try
            {
                if (br != null)
                br.close();
            } catch (IOException ex)
            {
                ex.printStackTrace();
            }
        }
    }
}

1) Read a small file in buffer of file size

package com.howtodoinjava.test.nio;
 
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
 
public class ReadFileWithFileSizeBuffer
{
    public static void main(String args[])
    {
        try
        {
            RandomAccessFile aFile = new RandomAccessFile(
                            "test.txt","r");
            FileChannel inChannel = aFile.getChannel();
            long fileSize = inChannel.size();
            ByteBuffer buffer = ByteBuffer.allocate((int) fileSize);
            inChannel.read(buffer);
            buffer.rewind();
            buffer.flip();
            for (int i = 0; i < fileSize; i++)
            {
                System.out.print((char) buffer.get());
            }
            inChannel.close();
            aFile.close();
        } 
        catch (IOException exc)
        {
            System.out.println(exc);
            System.exit(1);
        }
    }
}

2) Read a large file in chunks with fixed size buffer

package com.howtodoinjava.test.nio;
 
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
 
public class ReadFileWithFixedSizeBuffer 
{
    public static void main(String[] args) throws IOException 
    {
        RandomAccessFile aFile = new RandomAccessFile
                ("test.txt", "r");
        FileChannel inChannel = aFile.getChannel();
        ByteBuffer buffer = ByteBuffer.allocate(1024);
        while(inChannel.read(buffer) > 0)
        {
            buffer.flip();
            for (int i = 0; i < buffer.limit(); i++)
            {
                System.out.print((char) buffer.get());
            }
            buffer.clear(); // do something with the data and clear/compact it.
        }
        inChannel.close();
        aFile.close();
    }
}

3) Faster file copy with mapped byte buffer

package com.howtodoinjava.test.nio;
 
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
 
public class ReadFileWithMappedByteBuffer 
{
    public static void main(String[] args) throws IOException 
    {
        RandomAccessFile aFile = new RandomAccessFile
                ("test.txt", "r");
        FileChannel inChannel = aFile.getChannel();
        MappedByteBuffer buffer = inChannel.map(FileChannel.MapMode.READ_ONLY, 0, inChannel.size());
        buffer.load();  
        for (int i = 0; i < buffer.limit(); i++)
        {
            System.out.print((char) buffer.get());
        }
        buffer.clear(); // do something with the data and clear/compact it.
        inChannel.close();
        aFile.close();
    }
}

All above techniques will read the content of file and print it to console. You can do whatever you want once you have read it.

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标签 : nio

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IT瘾于2013年10月9日下午12时32分00秒发布 #