java 上传、下载 组建（源码） 彻底解决乱码问题。

package com.ct.jspsmart.upload; 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, File 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 Files m_files; private Request m_formRequest; private String charset; public String getCharset() { return charset; } public void setCharset(String charset) { this.charset = charset; } 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.ct.jspsmart.upload.File file = new com.ct.jspsmart.upload.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); String s11 = new String(m_binArray,m_startData,(m_endData - m_startData) +1, this.getCharset()); 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{