上传文件

来源：互联网发布：java里poi是什么编辑：程序博客网时间：2024/06/05 05:09

参考JavaWeb整合开发写的，直接贴代码。

package com.zhanghaipeng.servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.URLEncoder;
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;

public class UploadServlet extends HttpServlet {

private static final long serialVersionUID = 7523024737218332088L;
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");

}

@SuppressWarnings({ "unchecked", "deprecation" })
public void doPost(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {

  File file1 = null,file2 = null;
  String description1 = null,description2=null;

  response.setCharacterEncoding("UTF-8");

  response.setContentType("text/html");

  PrintWriter out = response.getWriter();
  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(" <link rel='stylesheet' type='text/css' href='../css/style.css'>");
  out.println(" <BODY>");

  out.println("<div align=center><br/>");
  out.println("<fieldset style='width:90%'><legend>上传文件</legend><br/>");

  out.println("  <div class='line'>");
  out.println("   <div align='left' class='leftDiv'>上传日志：</div>");
  out.println("   <div align='left' class='rightDiv'>");

  //使用DiskFileUpload对象解析request
  DiskFileUpload diskFileUpload = new DiskFileUpload();
  try {
   // 将解析的结果放置在 List 中
   List<FileItem> list = diskFileUpload.parseRequest(request);
   out.println("遍历所有的 FileItem ... <br/>");
   // 遍历 list 中所有的 FileItem
   for(FileItem fileItem : list){
    if(fileItem.isFormField()){
     // 如果是文本域
     if("description1".equals(fileItem.getFieldName())){
      // 如果该 FileItem 名称为 description1
      out.println("遍历到 description1 ... <br/>");
      description1 = new String(fileItem.getString().getBytes(), "UTF-8");
     }
     if("description2".equals(fileItem.getFieldName())){
      // 如果该 FileItem 名称为 description2
      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())){
      // 客户端文件路径构建的 File 对象
      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 upload 文件夹下
      file1 = new File(this.getServletContext().getRealPath("attachment"), remoteFile.getName());
      file1.getParentFile().mkdirs();
      file1.createNewFile();

      // 写文件，将 FileItem 的文件内容写到文件中
      InputStream ins = fileItem.getInputStream();
      OutputStream ous = new FileOutputStream(file1);

      try{
       byte[] buffer = new byte[1024];
       int len = 0;
       while((len=ins.read(buffer)) > -1)
        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())){
      // 客户端文件路径构建的 File 对象
      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 upload 文件夹下
      file2 = new File(this.getServletContext().getRealPath("attachment"), remoteFile.getName());
      file2.getParentFile().mkdirs();
      file2.createNewFile();

      // 写文件，将 FileItem 的文件内容写到文件中
      InputStream ins = fileItem.getInputStream();
      OutputStream ous = new FileOutputStream(file2);

      try{
       byte[] buffer = new byte[1024];
       int len = 0;
       while((len=ins.read(buffer)) > -1)
        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 Auto-generated catch block
   e.printStackTrace();
  }

  out.println("   </div>");
  out.println("  </div>");

  if(file1 != null){
  out.println("  <div class='line'>");
  out.println("   <div align='left' class='leftDiv'>file1：</div>");
  out.println("   <div align='left' class='rightDiv'>");
  out.println("    <a href='" + request.getContextPath() + "/attachment/" + file1.getName() + "' target=_blank>" + file1.getName() + "</a>" );
  out.println("   </div>");
  out.println("  </div>");
  }

  if(file2 != null){
  out.println("  <div class='line'>");
  out.println("   <div align='left' class='leftDiv'>file2：</div>");
  out.println("   <div align='left' class='rightDiv'>");
  out.println("    <a href='" + request.getContextPath() + "/attachment/" + URLEncoder.encode(file2.getName(), "UTF-8") + "' target=_blank>" + file2.getName() + "</a>" );
  out.println("   </div>");
  out.println("  </div>");
  }

  out.println("  <div class='line'>");
  out.println("   <div align='left' class='leftDiv'>description1：</div>");
  out.println("   <div align='left' class='rightDiv'>");
  out.println(description1);
  out.println("   </div>");
  out.println("  </div>");

  out.println("  <div class='line'>");
  out.println("   <div align='left' class='leftDiv'>description2：</div>");
  out.println("   <div align='left' class='rightDiv'>");
  out.println(description2);
  out.println("   </div>");
  out.println("  </div>");

  out.println("</fieldset></div>");

  out.println(" </BODY>");
  out.println("</HTML>");
  out.flush();
  out.close();
}

}

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