文件上传之Servlet

导包 commons-fileupload-1.3.1.jar commons-io-2.2.jar

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import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
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.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
 
 
public class UploadHandleServlet extends HttpServlet {
 
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
         
        String savePath=this.getServletContext().getRealPath("/WEB-INF/upload/");
        File file=new File(savePath);
        if(!file.exists()&&!file.isDirectory()){
            System.out.println(savePath+"目录不存在，需要创建");
             
            //创建目录
            file.mkdirs();
        }
         
        //消息提示
        String message="";
         
        //创建DiskFileItemFactory工厂
        DiskFileItemFactory factory=new DiskFileItemFactory();
        //创建一个文件上传解析器
        ServletFileUpload upload=new ServletFileUpload(factory);
        //解决文件上传乱码问题
        upload.setHeaderEncoding("UTF-8");
         
        if(!ServletFileUpload.isMultipartContent(request)){
            //按照传统方面获取数据
            return;
        }
         
        try {
            //使用ServletFileUpload解析器解析数据，返回来的是一个List<FileItem>集合,每一个FileItem对应一个表单输出
            List<FileItem> list=upload.parseRequest(request);
         
            for (FileItem item : list) {
                 
                if(item.isFormField()){
                    String name=item.getFieldName();
                    String value=item.getString("UTF-8");
                    System.out.println(name+"="+value);
                }else{
                    String filename=item.getName();
                    System.out.println(filename);
                    if(filename==null||filename.trim().equals("")){
                        continue;
                    }
                    //处理获取到的上传文件的文件名的路径部分，只保留文件名部分
                    filename=filename.substring(filename.lastIndexOf("\\")+1);
                    //获取item文件上传输入流
                    InputStream in=item.getInputStream();
                     
                    //创建一个文件输出流
                    FileOutputStream out=new FileOutputStream(savePath+"\\"+filename);
                     
                    byte[] buffer=new byte[1024];
                     
                    int len=0;
                     
                    while((len=in.read(buffer))>0){
                        out.write(buffer,0,len);
                    }
                    in.close();
                    out.close();
                    item.delete();
                 
                    message="文件上传成功";
                }
            }
        } catch (FileUploadException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
         
        request.setAttribute("message", message);
        request.getRequestDispatcher("/message.jsp").forward(request, response);
         
    }
 
     
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }
 
}
    

　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　　jsp页面

<%@ page language="java" pageEncoding="UTF-8"%>
  <!DOCTYPE HTML>
  <html>
    <head>
      <title>文件上传</title>
    </head>
     
    <body>
      <form action="${pageContext.request.contextPath}/UploadHandleServlet" enctype="multipart/form-data" method="post">
         上传用户：<input type="text" name="username"><br/>
         上传文件1：<input type="file" name="file1"><br/>
 
         <input type="submit" value="提交">
   </form>
 
</body>
 
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>成功页面</title>
</head>
<body>
${message}
</body>
</html>