JSP实用教程之简易文件上传组件的实现方法（附源码）

 
 
  
  selectimage: 
  
  
 
 

<%@page pageEncoding="UTF-8"%> 
<%@include file="Upload.jsp"%> 
<% 
 UploadRequest ur = new UploadRequest();// 创建请求信息，所有参数都在这儿设置 
 ur.setRequest(request); //一定要传入 request 
 ur.setFileOverwrite(true);// 相同文件名是否覆盖？true=允许覆盖 
 
 Upload upload = new Upload();// 上传器 
 
 try { 
  upload.upload(ur); 
 } catch (UploadException e) { 
  response.getWriter().println(e.toString()); 
 } 
 
 if (ur.isOk()) // 上传成功 
  response.getWriter().println("上传成功：" + ur.getUploaded_save_fileName()); 
 else 
  response.getWriter().println("上传失败！"); 
%> 

<%! 
 
 /** 
 * 获取开头数据头占用的长度 
 * 
 * @param dateBytes 
 *   文件二进制数据 
 * @return 
 */ 
 private static int getStartPos(byte[] dateBytes) { 
 
  .... 
 
 } 
 
> 

<%@page pageEncoding="UTF-8"%> 
<%!/** 
  * 上传请求的 bean，包含所有有关请求的信息 
  * @author frank 
  * 
  */ 
 public static class UploadRequest { 
  /** 
   * 上传最大文件大小，默认 1 MB 
   */ 
  private int MaxFileSize = 1024 * 1000; 
 
  /** 
   * 保存文件的目录 
   */ 
  private String upload_save_folder = "E:\\temp\\"; 
 
  /** 
   * 上传是否成功 
   */ 
  private boolean isOk; 
 
  /** 
   * 是否更名 
   */ 
  private boolean isNewName; 
 
  /** 
   * 成功上传之后的文件名。如果 isNewName = false，则是原上传的名字 
   */ 
  private String uploaded_save_fileName; 
 
  /** 
   * 相同文件名是否覆盖？true=允许覆盖 
   */ 
  private boolean isFileOverwrite = true; 
 
  private HttpServletRequest request; 
 
  /** 
   * @return the maxFileSize 
   */ 
  public int getMaxFileSize() { 
   return MaxFileSize; 
  } 
 
  /** 
   * @param maxFileSize the maxFileSize to set 
   */ 
  public void setMaxFileSize(int maxFileSize) { 
   MaxFileSize = maxFileSize; 
  } 
 
  /** 
   * @return the upload_save_folder 
   */ 
  public String getUpload_save_folder() { 
   return upload_save_folder; 
  } 
 
  /** 
   * @param upload_save_folder the upload_save_folder to set 
   */ 
  public void setUpload_save_folder(String upload_save_folder) { 
   this.upload_save_folder = upload_save_folder; 
  } 
 
  /** 
   * @return the isOk 
   */ 
  public boolean isOk() { 
   return isOk; 
  } 
 
  /** 
   * @param isOk the isOk to set 
   */ 
  public void setOk(boolean isOk) { 
   this.isOk = isOk; 
  } 
 
  /** 
   * @return the isNewName 
   */ 
  public boolean isNewName() { 
   return isNewName; 
  } 
 
  /** 
   * @param isNewName the isNewName to set 
   */ 
  public void setNewName(boolean isNewName) { 
   this.isNewName = isNewName; 
  } 
 
  /** 
   * @return the uploaded_save_fileName 
   */ 
  public String getUploaded_save_fileName() { 
   return uploaded_save_fileName; 
  } 
 
  /** 
   * @param uploaded_save_fileName the uploaded_save_fileName to set 
   */ 
  public void setUploaded_save_fileName(String uploaded_save_fileName) { 
   this.uploaded_save_fileName = uploaded_save_fileName; 
  } 
 
  /** 
   * @return the isFileOverwrite 
   */ 
  public boolean isFileOverwrite() { 
   return isFileOverwrite; 
  } 
 
  /** 
   * 相同文件名是否覆盖？true=允许覆盖 
   * @param isFileOverwrite the isFileOverwrite to set 
   */ 
  public void setFileOverwrite(boolean isFileOverwrite) { 
   this.isFileOverwrite = isFileOverwrite; 
  } 
 
  /** 
   * @return the request 
   */ 
  public HttpServletRequest getRequest() { 
   return request; 
  } 
 
  /** 
   * @param request the request to set 
   */ 
  public void setRequest(HttpServletRequest request) { 
   this.request = request; 
  } 
 
 } 
  
%> 

<%@page pageEncoding="UTF-8" import="java.io.*"%> 
<%@include file="UploadRequest.jsp"%> 
<%! 
 
public static class UploadException extends Exception { 
  
 private static final long serialVersiOnUID= 579958777177500819L; 
 
 public UploadException(String msg) { 
  super(msg); 
 } 
 
} 
 
public static class Upload { 
 /** 
  * 接受上传 
  * 
  * @param uRequest 
  *   上传 POJO 
  * @return 
  * @throws UploadException 
  */ 
 public UploadRequest upload(UploadRequest uRequest) throws UploadException { 
  HttpServletRequest req = uRequest.getRequest(); 
   
  // 取得客户端上传的数据类型 
  String cOntentType= req.getContentType(); 
 
  if(!req.getMethod().equals("POST")){ 
   throw new UploadException("必须 POST 请求"); 
  } 
   
  if (contentType.indexOf("multipart/form-data") == -1) { 
   throw new UploadException("未设置表单 multipart/form-data"); 
  } 
   
  int formDataLength = req.getContentLength(); 
   
  if (formDataLength > uRequest.getMaxFileSize()) { // 是否超大 
   throw new UploadException("文件大小超过系统限制！"); 
  } 
   
  // 保存上传的文件数据 
  byte dateBytes[] = new byte[formDataLength]; 
  int byteRead = 0, totalRead = 0; 
 
  try(DataInputStream in = new DataInputStream(req.getInputStream());){ 
   while (totalRead =0，未找到返回-1 
  * @param data 
  * @param search 
  * @param start 
  * @return 
  */ 
 private static int byteIndexOf(byte[] data, byte[] search, int start) { 
  int index = -1; 
  int len = search.length; 
  for (int i = start, j = 0; i  

 
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