WEB源码(ASP,PHP,...)

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Java

DefaultFileItem.java：源码内容
							package com.gamvan.fileUpload;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
public class DefaultFileItem implements FileItem{
    /**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	/**
     * Counter used in unique identifier generation.
     */
    private static int counter = 0;
   /**
     * The name of the form field as provided by the browser.
     */
    private String fieldName;
    /**
     * The content type passed by the browser, or <code>null</code> if
     * not defined.
     */
    private String contentType;
    /**
     * Whether or not this item is a simple form field.
     */
    private boolean isFormField;
    /**
     * The original filename in the user's filesystem.
     */
    private String fileName;
    /**
     * The threshold above which uploads will be stored on disk.
     */
    private int sizeThreshold;
    /**
     * The directory in which uploaded files will be stored, if stored on disk.
     */
    private File repository;
    /**
     * Cached contents of the file.
     */
    private byte[] cachedContent;
    /**
     * Output stream for this item.
     */
    private DeferredFileOutputStream dfos;
    DefaultFileItem(String fieldName, String contentType, boolean isFormField,
                    String fileName, int sizeThreshold, File repository)
    {
        this.fieldName = fieldName;
        this.contentType = contentType;
        this.isFormField = isFormField;
        this.fileName = fileName;
        this.sizeThreshold = sizeThreshold;
        this.repository = repository;
    }
    public InputStream getInputStream()
        throws IOException
    {
        if (!dfos.isInMemory())
        {
            return new FileInputStream(dfos.getFile());
        }
        if (cachedContent == null)
        {
            cachedContent = dfos.getData();
        }
        return new ByteArrayInputStream(cachedContent);
    }
    public String getContentType()
    {
        return contentType;
    }
    public String getName()
    {
        return fileName;
    }
    public boolean isInMemory()
    {
        return (dfos.isInMemory());
    }
    public long getSize()
    {
        if (cachedContent != null)
        {
            return cachedContent.length;
        }
        else if (dfos.isInMemory())
        {
            return dfos.getData().length;
        }
        else
        {
            return dfos.getFile().length();
        }
    }
    public byte[] get()
    {
        if (dfos.isInMemory())
        {
            if (cachedContent == null)
            {
                cachedContent = dfos.getData();
            }
            return cachedContent;
        }
        byte[] fileData = new byte[(int) getSize()];
        FileInputStream fis = null;
        try
        {
            fis = new FileInputStream(dfos.getFile());
            fis.read(fileData);
        }
        catch (IOException e)
        {
            fileData = null;
        }
        finally
        {
            if (fis != null)
            {
                try
                {
                    fis.close();
                }
                catch (IOException e)
                {
                    // ignore
                }
            }
        }
        return fileData;
    }
    public String getString(String encoding)
        throws UnsupportedEncodingException
    {
        return new String(get(), encoding);
    }
    public String getString()
    {
        return new String(get());
    }
    public void write(File file) throws Exception
    {
        if (isInMemory())
        {
            FileOutputStream fout = null;
            try
            {
                fout = new FileOutputStream(file);
                fout.write(get());
            }
            finally
            {
                if (fout != null)
                {
                    fout.close();
                }
            }
        }
        else
        {
            File outputFile = getStoreLocation();
            if (outputFile != null)
            {
                /*
                 * The uploaded file is being stored on disk
                 * in a temporary location so move it to the
                 * desired file.
                 */
                if (!outputFile.renameTo(file))
                {
                    BufferedInputStream in = null;
                    BufferedOutputStream out = null;
                    try
                    {
                        in = new BufferedInputStream(
                            new FileInputStream(outputFile));
                        out = new BufferedOutputStream(
                                new FileOutputStream(file));
                        byte[] bytes = new byte[2048];
                        int s = 0;
                        while ((s = in.read(bytes)) != -1)
                        {
                            out.write(bytes, 0, s);
                        }
                    }
                    finally
                    {
                        try
                        {
                            in.close();
                        }
                        catch (IOException e)
                        {
                            // ignore
                        }
                        try
                        {
                            out.close();
                        }
                        catch (IOException e)
                        {
                            // ignore
                        }
                    }
                }
            }
            else
            {
                /*
                 * For whatever reason we cannot write the
                 * file to disk.
                 */
                throw new FileUploadException(
                    "Cannot write uploaded file to disk!");
            }
        }
    }
    public void delete()
    {
        cachedContent = null;
        File outputFile = getStoreLocation();
        if (outputFile != null && outputFile.exists())
        {
            outputFile.delete();
        }
    }
    public String getFieldName()
    {
        return fieldName;
    }
    public void setFieldName(String fieldName)
    {
        this.fieldName = fieldName;
    }
    public boolean isFormField()
    {
        return isFormField;
    }
    public void setFormField(boolean state)
    {
        isFormField = state;
    }
    public OutputStream getOutputStream()
        throws IOException
    {
        if (dfos == null)
        {
            File outputFile = getTempFile();
            dfos = new DeferredFileOutputStream(sizeThreshold, outputFile);
        }
        return dfos;
    }
    public File getStoreLocation()
    {
        return dfos.getFile();
    }
    protected void finalize()
    {
        File outputFile = dfos.getFile();
        if (outputFile != null && outputFile.exists())
        {
            outputFile.delete();
        }
    }
    protected File getTempFile()
    {
        File tempDir = repository;
        if (tempDir == null)
        {
            tempDir = new File(System.getProperty("java.io.tmpdir"));
        }
        String fileName = "upload_" + getUniqueId() + ".tmp";
        File f = new File(tempDir, fileName);
        f.deleteOnExit();
        return f;
    }
    private static String getUniqueId()
    {
        int current;
        synchronized (DefaultFileItem.class)
        {
            current = counter++;
        }
        String id = Integer.toString(current);
        if (current < 100000000)
        {
            id = ("00000000" + id).substring(id.length());
        }
        return id;
    }
}

						