smartupload.java

完成了文件的上传,和下载功能模块,有详细的说明和注释,稍做修改就可以用到你项目中的.

package upload;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Vector;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;

public class SmartUpload
{
    protected byte m_binArray[];
    protected HttpServletRequest m_request;
    protected HttpServletResponse m_response;
    protected ServletContext m_application;
    private int m_totalBytes;
    private int m_currentIndex;
    private int m_startData;
    private int m_endData;
    private String m_boundary;
    private long m_totalMaxFileSize;
    private long m_maxFileSize;
    private Vector m_deniedFilesList;
    private Vector m_allowedFilesList;
    private boolean m_denyPhysicalPath;

    //private boolean m_forcePhysicalPath;
    private String m_contentDisposition;
    public static final int SAVE_AUTO = 0;
    public static final int SAVE_VIRTUAL = 1;
    public static final int SAVE_PHYSICAL = 2;
    private SmartFiles m_files;
    private SmartRequest m_formRequest;

    public SmartUpload()
    {
        m_totalBytes = 0;
        m_currentIndex = 0;
        m_startData = 0;
        m_endData = 0;
        m_boundary = ""; //new String();
        m_totalMaxFileSize = 0L;
        m_maxFileSize = 0L;
        m_deniedFilesList = new Vector();
        m_allowedFilesList = new Vector();
        m_denyPhysicalPath = false;
        //m_forcePhysicalPath = false;
        m_contentDisposition = ""; //new String();
        m_files = new SmartFiles();
        m_formRequest = new SmartRequest();
      //  mm_formRequest = new SmartRequest();
    }
    /**
     * @deprecated Method init is deprecated
     */
    public final void init(ServletConfig servletconfig) throws ServletException
    {
        m_application = servletconfig.getServletContext();
    }

    /**
     * @deprecated Method service is deprecated
     */
    public void service(HttpServletRequest httpservletrequest,HttpServletResponse httpservletresponse) throws ServletException,IOException
    {
        m_request = httpservletrequest;
        m_response = httpservletresponse;
    }

    public final void initialize(ServletConfig servletconfig,HttpServletRequest httpservletrequest,HttpServletResponse httpservletresponse) throws ServletException
    {
        m_application = servletconfig.getServletContext();
        m_request = httpservletrequest;
        m_response = httpservletresponse;
    }

    public final void initialize(PageContext pagecontext) throws ServletException
    {
        m_application = pagecontext.getServletContext();
        m_request = (HttpServletRequest)pagecontext.getRequest();
        m_response = (HttpServletResponse)pagecontext.getResponse();
    }

    /**
     * @deprecated Method initialize is deprecated
     */
    public final void initialize(ServletContext servletcontext,HttpSession httpsession,HttpServletRequest httpservletrequest,HttpServletResponse httpservletresponse,JspWriter jspwriter) throws ServletException
    {
        m_application = servletcontext;
        m_request = httpservletrequest;
        m_response = httpservletresponse;
    }

    public void upload() throws ServletException,IOException,SmartUploadException
    {
        int i = 0;
        //boolean flag = false;
        boolean flag1 = false;
        //boolean flag2 = false;
        long l = 0L;
        //String s = "";//new String();
        //String s2 = "";//new String();
        String s4 = ""; //new String();
        String s5 = ""; //new String();
        String s6 = ""; //new String();
        String s7 = ""; //new String();
        String s8 = ""; //new String();
        String s9 = ""; //new String();
        String s10 = ""; //new String();
        m_totalBytes = m_request.getContentLength();
        m_binArray = new byte[m_totalBytes];
        int j;
        for(;i < m_totalBytes;i += j)
        {
            try
            {
                m_request.getInputStream();
                j = m_request.getInputStream().read(m_binArray,i,m_totalBytes - i);
            }
            catch(Exception exception)
            {
                throw new SmartUploadException("Unable to upload.");
            }
        }

        for(;!flag1 && m_currentIndex < m_totalBytes;m_currentIndex++)
        {
            if(m_binArray[m_currentIndex] == 13)
            {
                flag1 = true;
            }
            else
            {
                m_boundary = m_boundary + (char)m_binArray[m_currentIndex];

            }
        }
        if(m_currentIndex == 1)
        {
            return;
        }
        for(m_currentIndex++;m_currentIndex < m_totalBytes;m_currentIndex = m_currentIndex + 2)
        {
            String s1 = getDataHeader();
            m_currentIndex = m_currentIndex + 2;
            boolean flag3 = s1.indexOf("filename") > 0;
            String s3 = getDataFieldValue(s1,"name");
            if(flag3)
            {
                s6 = getDataFieldValue(s1,"filename");
                s4 = getFileName(s6);
                s5 = getFileExt(s4);
                s7 = getContentType(s1);
                s8 = getContentDisp(s1);
                s9 = getTypeMIME(s7);
                s10 = getSubTypeMIME(s7);
            }
            getDataSection();
            if(flag3 && s4.length() > 0)
            {
                if(m_deniedFilesList.contains(s5))
                {
                    throw new SecurityException("The extension of the file is denied to be uploaded (1015).");
                }
                if(!m_allowedFilesList.isEmpty() && !m_allowedFilesList.contains(s5))
                {
                    throw new SecurityException("The extension of the file is not allowed to be uploaded (1010).");
                }
                if(m_maxFileSize > 0L && (long)((m_endData - m_startData) + 1) > m_maxFileSize)
                {
                    throw new SecurityException("Size exceeded for this file : " + s4 + " (1105).");
                }
                l += (m_endData - m_startData) + 1;
                if(m_totalMaxFileSize > 0L && l > m_totalMaxFileSize)
                {
                    throw new SecurityException("Total File Size exceeded (1110).");
                }
            }
            if(flag3)
            {
                SmartFile file = new SmartFile();
                file.setParent(this);
                file.setFieldName(s3);
                file.setFileName(s4);
                file.setFileExt(s5);
                file.setFilePathName(s6);
                file.setIsMissing(s6.length() == 0);
                file.setContentType(s7);
                file.setContentDisp(s8);
                file.setTypeMIME(s9);
                file.setSubTypeMIME(s10);
                if(s7.indexOf("application/x-macbinary") > 0)
                {
                    m_startData = m_startData + 128;
                }
                file.setSize((m_endData - m_startData) + 1);
                file.setStartData(m_startData);
                file.setEndData(m_endData);
                m_files.addFile(file);
            }
            else
            {
                String s11 = new String(m_binArray,m_startData,(m_endData - m_startData) + 1);
                m_formRequest.putParameter(s3,s11);
            }
            if((char)m_binArray[m_currentIndex + 1] == '-')
            {
                break;
            }
        }
    }

    public int save(String s) throws ServletException,IOException,SmartUploadException
    {
        return save(s,0);
    }

    public int save(String s,int i) throws ServletException,IOException,SmartUploadException
    {
        int j = 0;
        if(s == null)
        {
            s = m_application.getRealPath("/");
            //System.out.println("s == null,m_application.getRealPath:" + s);
        }
        if(s.indexOf("/") != -1)
        {
            if(s.charAt(s.length() - 1) != '/')
            {
                s = s + "/";
                //System.out.println("m_application.getRealPath::" + s);
            }
        }
        else
        {
            if(s.charAt(s.length() - 1) != '\\')
            {
                s = s + "\\";
                //System.out.println("m_application.getRealPath" + s);
            }
        }
        //System.out.println("m_application.getRealPath:::" + s);
        FileNames = new String[m_files.getCount()];
        for(int k = 0;k < m_files.getCount();k++)
        {
            if(!m_files.getFile(k).isMissing())
            {
                //System.out.println("s + m_files.getFile(k).getFileName():" + s + m_files.getFile(k).getFileName());
                m_files.getFile(k).saveAs(s + m_files.getFile(k).getFileName(),i);
                FileNames[j] = s + m_files.getFile(k).getFileName();
                j++;
            }
        }

        return j;
    }

    //Add
    private String[] FileNames;
    public String[] getFileNames()
    {
        //Method may expose internal representation by returning array
        //Returning an array value stored in one of the object's fields exposes the internal representation of the object.? For classes shared by other untrusted classes, this could potentially be a security issue.? Returning a new copy of the array is better approach in many situations.
        String[] vFileNames = new String[FileNames.length];
        System.arraycopy(FileNames,0,vFileNames,0,FileNames.length);
        return vFileNames;
    }

    public int getSize()
    {
        return m_totalBytes;
    }

    public byte getBinaryData(int i)
    {
        byte byte0;
        try
        {
            byte0 = m_binArray[i];
        }
        catch(Exception exception)
        {
            throw new ArrayIndexOutOfBoundsException("Index out of range (1005).");
        }
        return byte0;
    }

    public SmartFiles getFiles()
    {
        return m_files;
    }

    public SmartRequest getRequest()
    {
        return m_formRequest;
    }

    public void downloadFile(String s) throws ServletException,IOException,SmartUploadException,IllegalStateException
    {
        downloadFile(s,null,null);
    }

    public void downloadFile(String s,String s1) throws ServletException,IOException,SmartUploadException,SmartUploadException
    {
        downloadFile(s,s1,null);
    }

    public void downloadFile(String s,String s1,String s2) throws ServletException,IOException,SmartUploadException
    {
        downloadFile(s,s1,s2,65000);
    }

   /* public void downloadFile(String s,String s1,String s2,int i) throws ServletException,IOException,SmartUploadException
    {
        if(s == null)
        {
            throw new IllegalArgumentException("File '" + s + "' not found (1040).");
        }
        if(s.equals(""))
        {
            throw new IllegalArgumentException("File '" + s + "' not found (1040).");
        }
        if(!isVirtual(s) && m_denyPhysicalPath)
        {
            throw new SecurityException("Physical path is denied (1035).");
        }
        if(isVirtual(s))
        {
            s = m_application.getRealPath(s);
        }
        java.io.File file = new java.io.File(s);
        FileInputStream fileinputstream = new FileInputStream(file);
        long l = file.length();
        //boolean flag = false;
        int k = 0;
        byte abyte0[] = new byte[i];
        if(s1 == null)
        {
            m_response.setContentType("application/x-msdownload");
        }
        else
        {
            if(s1.length() == 0)
            {
                m_response.setContentType("application/x-msdownload");
            }
            else
            {
                m_response.setContentType(s1);
            }
        }
        m_response.setContentLength((int)l);
        m_contentDisposition = m_contentDisposition != null ? m_contentDisposition : "attachment;";
        if(s2 == null)
        {
            m_response.setHeader("Content-Disposition",m_contentDisposition + " filename=" + getFileName(s));
        }
        else
        {
            if(s2.length() == 0)
            {
                m_response.setHeader("Content-Disposition",m_contentDisposition);
            }
            else
            {
                m_response.setHeader("Content-Disposition",m_contentDisposition + " filename=" + s2);
            }
        }
        while((long)k < l)
        {
            int j = fileinputstream.read(abyte0,0,i);
            k += j;
         m_response.getOutputStream().write(abyte0,0,j);
         m_response.getOutputStream().write(abyte0,0,abyte0.length);
        }
        fileinputstream.close();
        FileInputStream fis=new FileInputStream("course.txt");
		ObjectInputStream ois=new ObjectInputStream(fis);
		FileOutputStream fos=new FileOutputStream("student.txt");
		ObjectOutputStream oos=new ObjectOutputStream(fos);
    }*/
    public static String toUtf8String(String s) {
        StringBuffer sb = new StringBuffer();
        for (int i=0;i<s.length();i++) {
            char c = s.charAt(i);
            if (c >= 0 && c <= 255) {
                sb.append(c);
            } else {
                byte[] b;
                try {
                    b = Character.toString(c).getBytes("utf-8");
                } catch (Exception ex) {
                    System.out.println(ex);
                    b = new byte[0];
                }
                for (int j = 0; j < b.length; j++) {
                    int k = b[j];
                    if (k < 0) k += 256;
                    sb.append("%" + Integer.toHexString(k).
                    toUpperCase());
                }
            }
        }
        return sb.toString();
    } 
    
    public void downloadFile(String s, String s1, String s2, int i)
    throws ServletException, IOException, SmartUploadException
{
    if(s == null)
        throw new IllegalArgumentException("File '" + s +
        "' not found (1040).");
    if(s.equals(""))
        throw new IllegalArgumentException("File '" + s +
        "' not found (1040).");
    if(!isVirtual(s) && m_denyPhysicalPath)
        throw new SecurityException("Physical path is denied (1035).");
    if(isVirtual(s))
        s = m_application.getRealPath(s);
    java.io.File file = new java.io.File(s);
    FileInputStream fileinputstream = new FileInputStream(file);
    long l = file.length();
    boolean flag = false;
    int k = 0;
    byte abyte0[] = new byte[i];
    if(s1 == null)
        m_response.setContentType("application/x-msdownload");
    else
    if(s1.length() == 0)
        m_response.setContentType("application/x-msdownload");
    else
        m_response.setContentType(s1);
    m_response.setContentLength((int)l);
    m_contentDisposition = m_contentDisposition != null ?
    m_contentDisposition : "attachment;";
    if(s2 == null)
        m_response.setHeader("Content-Disposition", 
        m_contentDisposition + " filename=" + 
        toUtf8String(getFileName(s)));
    else
    if(s2.length() == 0)
        m_response.setHeader("Content-Disposition", 
        m_contentDisposition);
    else
        m_response.setHeader("Content-Disposition", 
        m_contentDisposition + " filename=" + toUtf8String(s2));
    while((long)k < l)
    {
        int j = fileinputstream.read(abyte0, 0, i);
        k += j;
        m_response.getOutputStream().write(abyte0, 0, j);
        m_response.getOutputStream().write(abyte0,0,abyte0.length);
    }
    fileinputstream.close();
}

    public void downloadField(ResultSet resultset,String s,String s1,String s2) throws ServletException,IOException,SQLException
    {
        if(resultset == null)
        {
            throw new IllegalArgumentException("The RecordSet cannot be null (1045).");
        }
        if(s == null)
        {
            throw new IllegalArgumentException("The columnName cannot be null (1050).");
        }
        if(s.length() == 0)
        {
            throw new IllegalArgumentException("The columnName cannot be empty (1055).");
        }
        byte abyte0[] = resultset.getBytes(s);
        if(s1 == null)
        {
            m_response.setContentType("application/x-msdownload");
        }
        else
        {
            if(s1.length() == 0)
            {
                m_response.setContentType("application/x-msdownload");
            }
            else
            {
                m_response.setContentType(s1);
            }