Java 文件上传的实例详解

Java 文件上传的实例详解

java 文件上传

Java文件上传,介绍几种常用的方法,也是经过本人亲手调试过的

1.jspsmartupload

这个组件用起来是挺方便的,不过就是只适合小文件上传,如果大文件上传的话就不行,查看了一下他的代码,m_totalBytes = m_request.getContentLength(); m_binArray = new byte[m_totalBytes];居然把整个上传文件都读到内存去了,那如果是上传几十M的文件,同时几个用户上传,服务器稳挂,不过如果只是上传5M以内的小文件,这个组件还是挺实用的

下面是源代码:

File类

/*
 * 创建日期 2006-7-29
 *
 * 更改所生成文件模板为
 * 窗口 > 首选项 > Java > 代码生成 > 代码和注释
 */
package com.kinstar.issuing.file;
/**
 * @author gongyifeng
 *
 * 更改所生成类型注释的模板为
 * 窗口 > 首选项 > Java > 代码生成 > 代码和注释
 */
import java.io.ByteArrayInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.ServletException;
// Referenced classes of package com.jspsmart.upload:
// SmartUploadException,SmartUpload
public class File{
 private SmartUpload m_parent;
 private int m_startData;
 private int m_endData;
 private int m_size;
 private String m_fieldname;
 private String m_filename;
 private String m_fileExt;
 private String m_filePathName;
 private String m_contentType;
 private String m_contentDisp;
 private String m_typeMime;
 private String m_subTypeMime;
 private String m_contentString;
 private boolean m_isMissing;
 public static final int SAVEAS_AUTO = 0;
 public static final int SAVEAS_VIRTUAL = 1;
 public static final int SAVEAS_PHYSICAL = 2;
 File(){
 m_startData = 0;
 m_endData = 0;
 m_size = 0;
 m_fieldname = new String();
 m_filename = new String();
 m_fileExt = new String();
 m_filePathName = new String();
 m_contentType = new String();
 m_contentDisp = new String();
 m_typeMime = new String();
 m_subTypeMime = new String();
 m_contentString = new String();
 m_isMissing = true;
 }
 public void saveAs(String s) throws IOException,SmartUploadException{
 saveAs(s,0);
 }
 public void saveAs(String s,int i) throws IOException,SmartUploadException{
 String s1 = new String();
 s1 = m_parent.getPhysicalPath(s,i);
 if(s1 == null)
  throw new IllegalArgumentException("There is no specified destination file (1140).");
 try
 {
  java.io.File file = new java.io.File(s1);
  FileOutputStream fileoutputstream = new FileOutputStream(file);
  fileoutputstream.write(m_parent.m_binArray,m_startData,m_size);
  fileoutputstream.close();
 }
 catch(IOException ioexception)
 {
  throw new SmartUploadException("File can't be saved (1120).");
 }
 }
 public void fileToField(ResultSet resultset,String s) throws ServletException,IOException,SmartUploadException,SQLException{
 long l = 0L;
 int i = 0x10000;
 int j = 0;
 int k = m_startData;
 if(resultset == null)
  throw new IllegalArgumentException("The RecordSet cannot be null (1145).");
 if(s == null)
  throw new IllegalArgumentException("The columnName cannot be null (1150).");
 if(s.length() == 0)
  throw new IllegalArgumentException("The columnName cannot be empty (1155).");
 l = BigInteger.valueOf(m_size).divide(BigInteger.valueOf(i)).longValue();
 j = BigInteger.valueOf(m_size).mod(BigInteger.valueOf(i)).intValue();
 try
 {
  for(int i1 = 1; (long)i1 < l; i1++)
  {
  resultset.updateBinaryStream(s,new ByteArrayInputStream(m_parent.m_binArray,k,i),i);
  k = k != 0 ? k : 1;
  k = i1 * i + m_startData;
  }
  
  if(j > 0)
  resultset.updateBinaryStream(s,j),j);
 }catch(SQLException sqlexception){
  byte abyte0[] = new byte[m_size];
  System.arraycopy(m_parent.m_binArray,abyte0,m_size);
  resultset.updateBytes(s,abyte0);
 }catch(Exception exception)
 {
  throw new SmartUploadException("Unable to save file in the DataBase (1130).");
 }
 }
 public boolean isMissing(){
 return m_isMissing;
 }
 
 public String getFieldName(){
 return m_fieldname;
 }
 
 public String getFileName(){
 DateFormat df = new SimpleDateFormat("yyyyMMddHHmmss");
 String date = df.format(new Date());
 
 return date+m_filename;
 }
 
 public String getFilePathName(){
 return m_filePathName;
 }
 
 public String getFileExt(){
 return m_fileExt;
 }
 
 public String getContentType(){
 return m_contentType;
 }
 
 public String getContentDisp(){
 return m_contentDisp;
 }
 
 public String getContentString(){
 String s = new String(m_parent.m_binArray,m_size);
 return s;
 }
 
 public String getTypeMIME() throws IOException{
 return m_typeMime;
 }
 
 public String getSubTypeMIME(){
 return m_subTypeMime;
 }
 
 public int getSize(){
 return m_size;
 }
 
 protected int getStartData(){
 return m_startData;
 }
 
 protected int getEndData(){
 return m_endData;
 }
 
 protected void setParent(SmartUpload smartupload){
 m_parent = smartupload;
 }
 
 protected void setStartData(int i){
 m_startData = i;
 }
 
 protected void setEndData(int i){
 m_endData = i;
 }
 
 protected void setSize(int i){
 m_size = i;
 }
 
 protected void setIsMissing(boolean flag){
 m_isMissing = flag;
 }
 
 protected void setFieldName(String s){
 m_fieldname = s;
 }
 
 protected void setFileName(String s){
 m_filename = s;
 }
 
 protected void setFilePathName(String s){
 m_filePathName = s;
 }
 
 protected void setFileExt(String s){
 m_fileExt = s;
 }
 
 protected void setContentType(String s){
 m_contentType = s;
 }
 
 protected void setContentDisp(String s){
 m_contentDisp = s;
 }
 
 protected void setTypeMIME(String s){
 m_typeMime = s;
 }
 
 protected void setSubTypeMIME(String s){
 m_subTypeMime = s;
 }
 
 public byte getBinaryData(int i){
 if(m_startData + i > m_endData)
  throw new ArrayIndexOutOfBoundsException("Index Out of range (1115).");
 if(m_startData + i <= m_endData)
  return m_parent.m_binArray[m_startData + i];
 else
  return 0;
 } 
}

Files类

/*
 * 创建日期 2006-7-29
 *
 * 更改所生成文件模板为
 * 窗口 > 首选项 > Java > 代码生成 > 代码和注释
 */
package com.kinstar.issuing.file;
/**
 * @author gongyifeng
 *
 * 更改所生成类型注释的模板为
 * 窗口 > 首选项 > Java > 代码生成 > 代码和注释
 */
import java.io.IOException;
import java.util.*;
// Referenced classes of package com.jspsmart.upload:
// File,SmartUpload
public class Files{
 private SmartUpload m_parent;
 private Hashtable m_files;
 private int m_counter;
 
 Files(){
 m_files = new Hashtable();
 m_counter = 0;
 }
 
 protected void addFile(File file){
 if(file == null)
 {
  throw new IllegalArgumentException("newFile cannot be null.");
 } else {
  m_files.put(new Integer(m_counter),file);
  m_counter++;
  return;
 }
 }
 
 public File getFile(int i)
 {
 if(i < 0)
 throw new IllegalArgumentException("File's index cannot be a negative value (1210).");
 File file = (File)m_files.get(new Integer(i));
 if(file == null)
 throw new IllegalArgumentException("Files' name is invalid or does not exist (1205).");
 else
 return file;
 }
 
 public int getCount()
 {
 return m_counter;
 }
 
 public long getSize() throws IOException
 {
 long l = 0L;
 for(int i = 0; i < m_counter; i++)
 l += getFile(i).getSize();
 
 return l;
 }
 
 public Collection getCollection()
 {
 return m_files.values();
 }
 
 public Enumeration getEnumeration()
 {
 return m_files.elements();
 }
}

Request类

/*
 * 创建日期 2006-7-29
 *
 * 更改所生成文件模板为
 * 窗口 > 首选项 > Java > 代码生成 > 代码和注释
 */
package com.kinstar.issuing.file;
/**
 * @author gongyifeng
 *
 * 更改所生成类型注释的模板为
 * 窗口 > 首选项 > Java > 代码生成 > 代码和注释
 */
import java.util.Enumeration;
import java.util.Hashtable;
public class Request
{
 private Hashtable m_parameters;
 private int m_counter;
 
 Request(){
 m_parameters = new Hashtable();
 m_counter = 0;
 }
 
 protected void putParameter(String s,String s1) {
 if(s == null)
  throw new IllegalArgumentException("The name of an element cannot be null.");
 if(m_parameters.containsKey(s))
 {
  Hashtable hashtable = (Hashtable)m_parameters.get(s);
  hashtable.put(new Integer(hashtable.size()),s1);
 } else{
  Hashtable hashtable1 = new Hashtable();
  hashtable1.put(new Integer(0),s1);
  m_parameters.put(s,hashtable1);
  m_counter++;
 }
 }
 
 public String getParameter(String s){
 if(s == null)
 throw new IllegalArgumentException("Form's name is invalid or does not exist (1305).");
 Hashtable hashtable = (Hashtable)m_parameters.get(s);
 if(hashtable == null)
 return null;
 else
 return (String)hashtable.get(new Integer(0));
 }
 
 public Enumeration getParameterNames()
 {
 return m_parameters.keys();
 }
 
 public String[] getParameterValues(String s)
 {
 if(s == null)
  throw new IllegalArgumentException("Form's name is invalid or does not exist (1305).");
 Hashtable hashtable = (Hashtable)m_parameters.get(s);
 if(hashtable == null)
  return null;
 String as[] = new String[hashtable.size()];
 for(int i = 0; i < hashtable.size(); i++)
  as[i] = (String)hashtable.get(new Integer(i));
 
 return as;
 }
}

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