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最新推荐文章于 2025-08-13 18:53:35 发布

zhangliang1819

最新推荐文章于 2025-08-13 18:53:35 发布

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CC 4.0 BY-SA版权

文章标签： string file input initialization html import

本文链接：https://blog.youkuaiyun.com/zhangliang1819/article/details/5527816

项目分层：

UP.jsp 页面代码：

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>My JSP 'UP.jsp' starting page</title>

</head>

<body>
    <form action="../UpLoadServlet" method="post" enctype="multipart/form-data">
       用户名<input type="text" name="uname"/><br>
       密码：<input type="passsword" name="upwd"/><br>
       文件一:<input type="file" name="file1" ><br>
       文件二:<input type="file" name="file2"/>
       <input type="submit" value="提交"/>
    </form>
</body>
</html>

Success 页面代码：

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>My JSP 'Success.jsp' starting page</title>
</head>

<body>
name:${requestScope.uname}
passwor: ${requestScope.upwd }
   file1: ${requestScope.file1}
    file2: ${requestScope.file2}
</body>
</htm

Web.xml文件配置：

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

<servlet>
    <servlet-name>UpLoadServlet</servlet-name>
    <servlet-class>com.servlet.UpLoadServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>UpLoadServlet</servlet-name>
    <url-pattern>/UpLoadServlet</url-pattern>
</servlet-mapping>

</web-app>

Slervlet处理类

package com.servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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 UpLoadServlet extends HttpServlet {
    public UpLoadServlet() {
        super();
    }
    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 {

            doPost(request, response);
    }
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
            //response.setCharacterEncoding("gbk");
        DiskFileItemFactory factory=new DiskFileItemFactory();
        String path=request.getRealPath("//");//获取绝对路径

        factory.setRepository(new File(path));//能临时存放的文件
        factory.setSizeThreshold(1024*1024);//超过 1024*1024 的字节的文件就存放到临时文件否则放到内存

        ServletFileUpload upload=new ServletFileUpload(factory);

        try {
            //得到一个表单说所有项的集合一个字段当作一个FileItemitem
            List<FileItem> list=upload.parseRequest(request);
            for (FileItem item : list) {

                if(item.isFormField())//非文件类型的表单FileItem
                {
                    String name=item.getFieldName();//获得表单字段 name
                    String value=item.getString("gbk");//获得表单字段的值并且进行编号转换
                    request.setAttribute(name, value);
                }else
                {
                    //文件类型的处理
                    String name=item.getFieldName();//获得表单字段的name
                    String value=item.getName();//得到表单 file里面的值（路径）

                    //截取得到上传文件的名称 ——例如 G:/kankan/电影.bmp 的到电影.bmp
                    String fileName=value.substring(value.lastIndexOf("//")+1);// "//"通过jdk编译之后转意为 "/"
                    request.setAttribute(name, fileName);//把文件名称放进作用域
                    //构造一个输出流
                    OutputStream os=new FileOutputStream(new File(path+"//fileUpload//upload",fileName));
                    //得到当前文件的输入流
                    InputStream is=item.getInputStream();
                    byte []butter=new byte[400];

                    int length=0;
                    while ((length=is.read(butter))>0) {

                        os.write(butter,0,length);//写文件
                    }
                    os.close();
                    is.close();
                }
            }
            request.getRequestDispatcher("/fileUpload/Success.jsp").forward(request, response);
        } catch (FileUploadException e) {
            // TODO 自动生成 catch 块
            e.printStackTrace();
            request.getRequestDispatcher("/fileUpload/Success.jsp").forward(request, response);
        }finally{

        }

    }

    /**
    * Initialization of the servlet. <br>
    *
    * @throws ServletException if an error occure
    */
    public void init() throws ServletException {
        // Put your code here
    }
}