这篇文章主要介绍了Java 文件上传的实例详解的相关资料,希望通过本文大家能掌握这部分内容，使用几种文件上传的方法，需要的朋友可以参考下
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, SmartUploadpublic 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).pide(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, new ByteArrayInputStream(m_parent.m_binArray, k, j), j); }catch(SQLException sqlexception){ byte abyte0[] = new byte[m_size]; System.arraycopy(m_parent.m_binArray, m_startData, abyte0, 0, 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_startData, 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, SmartUploadpublic 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; }}
SmartUpload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.*;import java.sql.ResultSet;import java.sql.SQLException;import java.util.Vector;import javax.servlet.*;import javax.servlet.http.*;import javax.servlet.jsp.JspWriter;import javax.servlet.jsp.PageContext;// Referenced classes of package com.jspsmart.upload:// Files, Request, SmartUploadException, Filepublic 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 Files m_files; private Request 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 Files(); m_formRequest = new Request(); } public final void init(ServletConfig servletconfig) throws ServletException { m_application = servletconfig.getServletContext(); } 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(); } 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; long l = 0L; boolean flag1 = false; 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(); boolean flag2 = false; 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) { com.kinstar.issuing.file.File file = new com.kinstar.issuing.file.File(); 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("/"); if(s.indexOf("/") != -1) { if(s.charAt(s.length() - 1) != '/') s = s + "/"; } else if(s.charAt(s.length() - 1) != '\\') s = s + "\\"; for(int k = 0; k < m_files.getCount(); k++) if(!m_files.getFile(k).isMissing()) { m_files.getFile(k).saveAs(s + m_files.getFile(k).getFileName(), i); j++; } return j; } 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 Files getFiles() { return m_files; } public Request getRequest() { return m_formRequest; } public void downloadFile(String s) throws ServletException, IOException, SmartUploadException { 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); } 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); m_response.setContentLength(abyte0.length); if(s2 == null) m_response.setHeader("Content-Disposition", "attachment;"); else if(s2.length() == 0) m_response.setHeader("Content-Disposition", "attachment;"); else m_response.setHeader("Content-Disposition", "attachment; filename=" + s2); m_response.getOutputStream().write(abyte0, 0, abyte0.length); } public void fieldToFile(ResultSet resultset, String s, String s1)throws ServletException, IOException, SmartUploadException, SQLException { try { if(m_application.getRealPath(s1) != null) s1 = m_application.getRealPath(s1); InputStream inputstream = resultset.getBinaryStream(s); FileOutputStream fileoutputstream = new FileOutputStream(s1); int i; while((i = inputstream.read()) != -1) fileoutputstream.write(i); fileoutputstream.close(); } catch(Exception exception) { throw new SmartUploadException("Unable to save file from the DataBase (1020)."); } } private String getDataFieldValue(String s, String s1) { String s2 = new String(); String s3 = new String(); int i = 0; boolean flag = false; boolean flag1 = false; boolean flag2 = false; s2 = s1 + "=" + '"'; i = s.indexOf(s2); if(i > 0) { int j = i + s2.length(); int k = j; s2 = "\&;"; int l = s.indexOf(s2, j); if(k > 0 && l > 0) s3 = s.substring(k, l); } return s3; } private String getFileExt(String s) { String s1 = new String(); int i = 0; int j = 0; if(s == null) return null; i = s.lastIndexOf(46) + 1; j = s.length(); s1 = s.substring(i, j); if(s.lastIndexOf(46) > 0) return s1; else return ""; } private String getContentType(String s) { String s1 = new String(); String s2 = new String(); int i = 0; boolean flag = false; s1 = "Content-Type:"; i = s.indexOf(s1) + s1.length(); if(i != -1) { int j = s.length(); s2 = s.substring(i, j); } return s2; } private String getTypeMIME(String s) { String s1 = new String(); int i = 0; i = s.indexOf("/"); if(i != -1) return s.substring(1, i); else return s; } private String getSubTypeMIME(String s) { String s1 = new String(); int i = 0; boolean flag = false; i = s.indexOf("/") + 1; if(i != -1) { int j = s.length(); return s.substring(i, j); } else { return s; } } private String getContentDisp(String s) { String s1 = new String(); int i = 0; int j = 0; i = s.indexOf(":") + 1; j = s.indexOf(";"); s1 = s.substring(i, j); return s1; } private void getDataSection() { boolean flag = false; String s = new String(); int i = m_currentIndex; int j = 0; int k = m_boundary.length(); m_startData = m_currentIndex; m_endData = 0; while(i < m_totalBytes) if(m_binArray[i] == (byte)m_boundary.charAt(j)) { if(j == k - 1) { m_endData = ((i - k) + 1) - 3; break; } i++; j++; } else { i++; j = 0; } m_currentIndex = m_endData + k + 3; } private String getDataHeader() { int i = m_currentIndex; int j = 0; boolean flag = false; for(boolean flag1 = false; !flag1;) if(m_binArray[m_currentIndex] == 13 && m_binArray[m_currentIndex + 2] == 13) { flag1 = true; j = m_currentIndex - 1; m_currentIndex = m_currentIndex + 2; } else { m_currentIndex++; } String s = new String(m_binArray, i, (j - i) + 1); return s; } private String getFileName(String s) { String s1 = new String(); String s2 = new String(); int i = 0; boolean flag = false; boolean flag1 = false; boolean flag2 = false; i = s.lastIndexOf(47); if(i != -1) return s.substring(i + 1, s.length()); i = s.lastIndexOf(92); if(i != -1) return s.substring(i + 1, s.length()); else return s; } public void setDeniedFilesList(String s) throws ServletException, IOException, SQLException { String s1 = ""; if(s != null) { String s2 = ""; for(int i = 0; i < s.length(); i++) if(s.charAt(i) == ',') { if(!m_deniedFilesList.contains(s2)) m_deniedFilesList.addElement(s2); s2 = ""; } else { s2 = s2 + s.charAt(i); } if(s2 != "") m_deniedFilesList.addElement(s2); } else { m_deniedFilesList = null; } } public void setAllowedFilesList(String s) { String s1 = ""; if(s != null) { String s2 = ""; for(int i = 0; i < s.length(); i++) if(s.charAt(i) == ',') { if(!m_allowedFilesList.contains(s2)) m_allowedFilesList.addElement(s2); s2 = ""; } else { s2 = s2 + s.charAt(i); } if(s2 != "") m_allowedFilesList.addElement(s2); } else { m_allowedFilesList = null; } } public void setDenyPhysicalPath(boolean flag) { m_denyPhysicalPath = flag; } public void setForcePhysicalPath(boolean flag) { m_forcePhysicalPath = flag; } public void setContentDisposition(String s) { m_contentDisposition = s; } public void setTotalMaxFileSize(long l) { m_totalMaxFileSize = l; } public void setMaxFileSize(long l) { m_maxFileSize = l; } protected String getPhysicalPath(String s, int i)throws IOException { String s1 = new String(); String s2 = new String(); String s3 = new String(); boolean flag = false; s3 = System.getProperty("file.separator"); if(s == null) throw new IllegalArgumentException("There is no specified destination file (1140)."); if(s.equals("")) throw new IllegalArgumentException("There is no specified destination file (1140)."); if(s.lastIndexOf("\\") >= 0) { s1 = s.substring(0, s.lastIndexOf("\\")); s2 = s.substring(s.lastIndexOf("\\") + 1); } if(s.lastIndexOf("/") >= 0) { s1 = s.substring(0, s.lastIndexOf("/")); s2 = s.substring(s.lastIndexOf("/") + 1); } s1 = s1.length() != 0 ? s1 : "/"; java.io.File file = new java.io.File(s1); if(file.exists()) flag = true; if(i == 0) { if(isVirtual(s1)) { s1 = m_application.getRealPath(s1); if(s1.endsWith(s3)) s1 = s1 + s2; else s1 = s1 + s3 + s2; return s1; } if(flag) { if(m_denyPhysicalPath) throw new IllegalArgumentException("Physical path is denied (1125)."); else return s; } else { throw new IllegalArgumentException("This path does not exist (1135)."); } } if(i == 1) { if(isVirtual(s1)) { s1 = m_application.getRealPath(s1); if(s1.endsWith(s3)) s1 = s1 + s2; else s1 = s1 + s3 + s2; return s1; } if(flag) throw new IllegalArgumentException("The path is not a virtual path."); else throw new IllegalArgumentException("This path does not exist (1135)."); } if(i == 2) { if(flag) if(m_denyPhysicalPath) throw new IllegalArgumentException("Physical path is denied (1125)."); else return s; if(isVirtual(s1)) throw new IllegalArgumentException("The path is not a physical path."); else throw new IllegalArgumentException("This path does not exist (1135)."); } else { return null; } } public void uploadInFile(String s)throws IOException, SmartUploadException { int i = 0; int j = 0; boolean flag = false; if(s == null) throw new IllegalArgumentException("There is no specified destination file (1025)."); if(s.length() == 0) throw new IllegalArgumentException("There is no specified destination file (1025)."); if(!isVirtual(s) && m_denyPhysicalPath) throw new SecurityException("Physical path is denied (1035)."); i = m_request.getContentLength(); m_binArray = new byte[i]; int k; for(; j < i; j += k) try { k = m_request.getInputStream().read(m_binArray, j, i - j); } catch(Exception exception) { throw new SmartUploadException("Unable to upload."); } if(isVirtual(s)) s = m_application.getRealPath(s); try { java.io.File file = new java.io.File(s); FileOutputStream fileoutputstream = new FileOutputStream(file); fileoutputstream.write(m_binArray); fileoutputstream.close(); } catch(Exception exception1) { throw new SmartUploadException("The Form cannot be saved in the specified file (1030)."); } } private boolean isVirtual(String s) { if(m_application.getRealPath(s) != null) { java.io.File file = new java.io.File(m_application.getRealPath(s)); return file.exists(); } else { return false; } }}
SmartUploadException 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 */public class SmartUploadException extends Exception{ SmartUploadException(String s) { super(s); }}
上传的Servlet
package com.kinstar.issuing.action;import java.io.IOException;import javax.servlet.Servlet;import javax.servlet.ServletException;import java.io.*;import java.sql.SQLException;import java.util.*;import java.text.*;import javax.servlet.*;import javax.servlet.http.*;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.kinstar.issuing.file.File;import com.kinstar.issuing.file.SmartUpload;import com.kinstar.issuing.objects.t_user;import com.kinstar.issuing.operation.UserOperation;import com.kinstar.issuing.program.programService;import com.kinstar.issuing.session.SessionGloble;import com.kinstar.issuing.util.StringUtil;/** * @version 1.0 * @author gyf */public class upload2ProgramAction extends HttpServlet{ private ServletConfig config; /** * 初始化Servlet */ final public void init(ServletConfig config) throws ServletException { this.config = config; } /** * 处理GET请求 */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } /** * 响应POST请求 */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { int count=0; SmartUpload mySmartUpload = new SmartUpload(); try { // 初始化 mySmartUpload.initialize(config,request,response); // 上载 mySmartUpload.upload(); com.kinstar.issuing.file.File f1 = mySmartUpload.getFiles().getFile(0); // com.kinstar.issuing.file.File f2 = mySmartUpload.getFiles().getFile(1); String backPic = f1.getFileName(); //String name2 = f2.getFileName(); long size=0; // 保存上载文件到指定目录 count=mySmartUpload.save("ads"); response.sendRedirect("program.jsp?dopass=ture"); } catch (Exception e){ response.sendRedirect("fail.jsp"); } }
2.common-fileupload组件
挺好用的,也能够上传大文件,我试过,300M以上的文件上传本地传非常快,异地测试也能够上传成功.
首先要下载org.apache.commons.fileupload包和org.apache.commons.io包
下面是我的servlet
package com.kinstar.issuing.action;import java.io.IOException;import javax.servlet.Servlet;import javax.servlet.ServletException;import java.io.*;import java.sql.SQLException;import java.util.*;import java.text.*;import javax.servlet.*;import javax.servlet.http.*;import java.util.regex.*;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.apache.commons.fileupload.DiskFileUpload;import org.apache.commons.fileupload.FileItem;import org.apache.commons.fileupload.FileUploadException;import com.kinstar.issuing.objects.t_user;import com.kinstar.issuing.operation.UserOperation;import com.kinstar.issuing.program.programService;import com.kinstar.issuing.session.SessionGloble;import com.kinstar.issuing.util.StringUtil;/** * @version 1.0 * @author gyf */public class uploadProgramAction extends HttpServlet{ private static final String CONTENT_TYPE = "text/html; charset=GB2312"; /** * 处理GET请求 */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } /** * 响应POST请求 */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 变量定义 response.setContentType(CONTENT_TYPE); HttpSession modifysession=request.getSession(); SessionGloble logonUser; logonUser=(SessionGloble)modifysession.getAttribute("UserInfo"); if(logonUser==null){ response.sendRedirect("mainindex.jsp"); } t_user userinfo=new t_user(); UserOperation user=null; try { user = new UserOperation(); } catch (Exception e1) { // TODO 自动生成 catch 块 e1.printStackTrace(); } try { userinfo=user.getUser(logonUser.getUserId()); } catch (Exception e2) { // TODO 自动生成 catch 块 e2.printStackTrace(); } //System.out.println("figure="+userinfo.getUserFigure()); PrintWriter out=response.getWriter(); DateFormat updf = new SimpleDateFormat("yyyyMMddHHmm"); String updateTime = updf.format(new Date()); int isNeed = 0; String IsCheck="0"; //省农行用户上传的节目必需显示，且审批已经合格 if(userinfo.getUserFigure().equals("1")){ isNeed = 1; IsCheck = "1"; } else{ isNeed = 0; IsCheck = "0"; } int type=0; String avaTime=""; String screen=""; int fileTime=0; int fileTimeReal=0; int circle=0; String picSwitch=""; String deleState="1"; String backPic=""; String fieldName=""; String finalName=""; String fileNameReal=""; long size=0; String name=""; try { DiskFileUpload fu = new DiskFileUpload(); // 设置允许用户上传文件大小,单位:字节，这里设为2m fu.setSizeMax(5*1024*1024*1024); // 设置最多只允许在内存中存储的数据,单位:字节 fu.setSizeThreshold(10*1024*1024); // 设置一旦文件大小超过getSizeThreshold()的值时数据存放在硬盘的目录 fu.setRepositoryPath("C:\\WINDOWS\\Temp\\"); //开始读取上传信息 List fileItems = fu.parseRequest(request); //依次处理每个上传的文件 Iterator iter = fileItems.iterator(); //正则匹配，过滤路径取文件名 String regExp=".+\\\\(.+)$"; //过滤掉的文件类型 String[] errorType={".exe",".com",".cgi",".asp"}; Pattern p = Pattern.compile(regExp); StringUtil su = new StringUtil(); while (iter.hasNext()) { FileItem item = (FileItem)iter.next(); if(item.isFormField()) { // 获得表单域的名字 fieldName = item.getFieldName(); // 如果表单域的名字是name… if(fieldName.equals("type")) type = Integer.parseInt(item.getString()); } if (!item.isFormField()) { name = item.getName(); size = item.getSize(); if((name==null||name.equals("")) && size==0) continue; Matcher m = p.matcher(name); boolean result = m.find(); if (result){ for (int temp=0;temp<errorType.length;temp++){ if (m.group(1).endsWith(errorType[temp])){ throw new IOException(name+": wrong type"); } } DateFormat df = new SimpleDateFormat("yyyyMMddHHmmss"); String date = df.format(new Date()); fileNameReal=date+m.group(1); finalName=date+Math.round(Math.random()*10000)+fileNameReal.substring(fileNameReal.indexOf(".")); //保存上传的文件到指定的目录 //在下文中上传文件至数据库时，将对这里改写 item.write(new File(getServletContext().getRealPath(".//ads//")+finalName)); //out.print(finalName+size); } else { throw new IOException("fail to upload"); } } if(item.isFormField()) { // 获得表单域的名字 fieldName = item.getFieldName(); if(fieldName.equals("avaTime")) avaTime=item.getString(); if(fieldName.equals("screen")) screen=item.getString(); if(fieldName.equals("fileTime")) fileTime = Integer.parseInt(item.getString()); if(fieldName.equals("fileTimeReal")) fileTimeReal = Integer.parseInt(item.getString()); if(fieldName.equals("circle")) circle = Integer.parseInt(item.getString()); if(fieldName.equals("switchPic")) picSwitch = item.getString(); } } }catch (IOException e){ out.println(e); }catch (FileUploadException e){ out.println(e); } catch (Exception e) { // TODO 自动生成 catch 块 e.printStackTrace(); } if(finalName.equals("")){ response.sendRedirect("fail.jsp"); } else{ try { programService ps = new programService(); ps.insertProgram(userinfo.getUserId(),updateTime,type,finalName,size,isNeed,avaTime,deleState,IsCheck,userinfo.getCity(),backPic,screen,fileTime,fileTimeReal,picSwitch,circle,userinfo.getUserFigure(),new String(fileNameReal.getBytes("GB2312"),"ISO8859-1")); response.sendRedirect("program.jsp?dopass=true"); } catch (Exception e3) { // TODO 自动生成 catch 块 e3.printStackTrace(); } } }}
以上就是Java实现文件上传的代码实例的详细内容，更多请关注其它相关文章！
记忆的屏障，曾经心动的声音已渐渐远去。
