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JavaWeb文件上传开发实例

转载 作者：qq735679552 更新时间：2022-09-29 22:32:09 25 4
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文件上传有SmartUpload、Apache的Commons fileupload.我们今天介绍Commons fileupload的用法。  。

1.commons-fileupload-1.3.1.jar 下载地址：javawebfileupload.rar 。

2.web.xml 。

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<!-- 上传文件 服务器端 -->
  < servlet >
  < servlet-name >UploadServlet</ servlet-name >
  < servlet-class >com.servlet.UploadServlet</ servlet-class >
  < init-param >
  < param-name >filePath</ param-name > <!-- 文件存储路径 -->
  < param-value >F:\myeclipse\Workspaces\King\WebRoot\uploadfile\</ param-value >
  </ init-param >
  </ servlet >
 
  < servlet-mapping >
  < servlet-name >UploadServlet</ servlet-name >
  < url-pattern >/servlet/UploadServlet</ url-pattern >
  </ servlet-mapping >
3.UploadFile.jsp
< form action = "servlet/UploadServlet" method = "post" enctype = "multipart/form-data" >
   < div align = "center" >
    < fieldset style = "width:80%" >
     < legend >上传文件</ legend >< br />
      < div align = "left" >上传文件1</ div >
      < div align = "left" >
       < input type = "file" name = "file1" />
      </ div >
      < div align = "left" >上传文件2</ div >
      < div align = "left" >
       < input type = "file" name = "file2" />
      </ div >
      < div >
       < div align = 'left' >上传文件说明1</ div >
       < div align = 'left' >< input type = "text" name = "description1" /></ div >
      </ div >
      < div >
       < div align = 'left' >上传文件说明2</ div >
       < div align = 'left' >< input type = "text" name = "description2" /></ div >
      </ div >
      < div >
       < div align = 'left' >
        < input type = 'submit' value = "上传文件" />
       </ div >
      </ div >
    </ fieldset >
   </ div >
  </ form >

3.servlet 。

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package com.servlet;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.List;
 
import javax.servlet.ServletException;
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 sun.swing.FilePane;
 
public class UploadServlet extends HttpServlet {
 
  private String filePath;
 
 
  /**
   * Destruction of the servlet. <br>
   */
  public void destroy() {
   super .destroy(); // Just puts "destroy" string in log
   // Put your code here
  }
 
 
  public void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
 
   response.setCharacterEncoding( "UTF-8" );
   response.getWriter().println( "请以POST方式上传文件" );
  }
 
 
  public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
   File file1 = null , file2 = null ;
   String description1 = null , description2 = null ;
   response.setCharacterEncoding( "UTF-8" );
   request.setCharacterEncoding( "UTF-8" );
   response.setContentType( "text/html" );
   PrintWriter out = response.getWriter();
  
   DiskFileUpload diskFileUpload = new DiskFileUpload(); //解析request
  
   try {
    List<FileItem> fileList = diskFileUpload.parseRequest(request); //将结果放置到List中
    out.println( "遍历所有的FileItem...</br>" );
    this .log( "遍历所有的FileItem..." );
    for (FileItem fileItem : fileList){
     if (fileItem.isFormField()){ //如果是文本域
      if ( "description1" .equals(fileItem.getFieldName())){
       out.println( "遍历到description1...</br>" );
       description1 = new String(fileItem.getString().getBytes(), "UTF-8" );
      }
      if ( "description2" .equals(fileItem.getFieldName())){
       out.println( "遍历到description2...</br>" );
       description2 = new String(fileItem.getString().getBytes(), "UTF-8" );
      }
     } else { //否则为文件域
      if ( "file1" .equals(fileItem.getFieldName())){
       File remoteFile = new File( new String(fileItem.getName().getBytes(), "UTF-8" ));
       out.println( "遍历到file1...</br>" );
       out.println( "客户端文件位置：" +remoteFile.getAbsolutePath()+ "</br>" );
       //服务器端文件，放在uploadfile文件夹下
       file1 = new File(filePath,remoteFile.getName());
       file1.getParentFile().mkdirs(); //创建文件夹路径
       file1.createNewFile(); //创建新文件
       InputStream ins = fileItem.getInputStream(); //FileItem的内容
       OutputStream ous = new FileOutputStream(file1); //输出到文件中
       try {
        byte [] buffer = new byte [ 1024 ]; //字节缓存
        int len = 0 ; //实际缓存长度
        while ((len=ins.read(buffer)) > - 1 ){ //循环读入缓存
         ous.write(buffer, 0 ,len);
        }
        out.println( "已保存文件" +file1.getAbsolutePath()+ "</br>" );
       }
       finally {
        ous.close();
        ins.close();
       }
      }
      if ( "file2" .equals(fileItem.getFieldName())){
       File remoteFile = new File( new String(fileItem.getName().getBytes(), "UTF-8" ));
       out.println( "遍历到file2...</br>" );
       out.println( "客户端文件位置：" +remoteFile.getAbsolutePath()+ "</br>" );
       //服务器端文件，放在uploadfile文件夹下
       file2 = new File(filePath,remoteFile.getName());
       file2.getParentFile().mkdirs(); //创建文件夹路径
       file2.createNewFile(); //创建新文件
       InputStream ins = fileItem.getInputStream(); //FileItem的内容
       OutputStream ous = new FileOutputStream(file2); //输出到文件中
       try {
        byte [] buffer = new byte [ 1024 ]; //字节缓存
        int len = 0 ; //实际缓存长度
        while ((len=ins.read(buffer)) > - 1 ){ //循环读入缓存
         ous.write(buffer, 0 ,len);
        }
        out.println( "已保存文件" +file2.getAbsolutePath()+ "</br>" );
       }
       finally {
        ous.close();
        ins.close();
       }
      }
     }
    }
    out.println( "Request 解析完毕" );
   } catch (FileUploadException e) {
    // TODO 自动生成的 catch 块
    out.println( "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">" );
    out.println( "<HTML>" );
    out.println( " <HEAD><TITLE>A Servlet</TITLE></HEAD>" );
    out.println( " <BODY>" );
   
    if (file1 != null ){
     out.println( "<div>" );
     out.println( " <div align='left'>file1;</div>" );
     out.println( " <div align='left'><a href='" +request.getContextPath()+
       file1.getName()+ "'target=_blank>" +file1.getName()+ "</a>" );
     out.println( "</div>" );
     out.println( "</div>" );
    }
    if (file2 != null ){
     out.println( "<div>" );
     out.println( " <div align='left'>file2;</div>" );
     out.println( " <div align='left'><a href='" +request.getContextPath()+
       file2.getName()+ "'target=_blank>" +file2.getName()+ "</a>" );
     out.println( "</div>" );
     out.println( "</div>" );
    }
    out.println( "<div>" );
    out.println( " <div align='left'>description1:</div>" );
    out.println( " <div align='left'>" );
    out.println(description1);
    out.println( "</div>" );
    out.println( "</div>" );
   
    out.println( "<div>" );
    out.println( " <div align='left'>description2:</div>" );
    out.println( " <div align='left'>" );
    out.println(description2);
    out.println( "</div>" );
    out.println( "</div>" );
   
    out.println( " </BODY>" );
    out.println( "</HTML>" );
    out.flush();
    out.close();
   }
  
  }
 
  public String getServletInfo() {
   return "This is my default servlet created by Eclipse" ;
  }
 
 
  public void init() throws ServletException {
   // Put your code here
   filePath = getServletConfig().getInitParameter( "filePath" );
  }
 
}

JavaWeb文件上传开发实例

JavaWeb文件上传开发实例

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