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Spring实现文件上传(示例代码)

2015-07-23 14:48 381 查看

Spring可以继承commons-fileupload插件来实现文件上传的功能。分为前端JSP编写和后台Controller的编写

在实际开发中，经常遇到要实现文件上传到服务器端的功能。Spring可以继承commons-fileupload插件来实现文件上传的功能。分为前端JSP编写和后台Controller的编写。

前期准备工作，首先要引入commons-fileupload这个jar包，pom.xml中的配置如下：

复制代码代码如下:



<dependency>

<groupId>commons-fileupload</groupId>

<artifactId>commons-fileupload</artifactId>

<version>1.2.2</version>

</dependency>

然后配置拦截器，在dispatcher-servlet.xml中添加
复制代码代码如下:



<bean id="multipartResolver"

class="org.springframework.web.multipart.commons.CommonsMultipartResolver">



<property name="maxUploadSize">

  <value>1048576</value>

</property>

</bean>

直接上代码：
1、前端JSP编写

upload.jsp

复制代码代码如下:

<%@ page language="java" pageEncoding="UTF-8"%>

<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

  <script src="resources/js/jquery.js"></script>

</head>

<body>

  <form method="post" action="upload.do" enctype="multipart/form-data">

   <input type="file" name="file" />

   <input type="submit" />

  </form>

</body>

</html>

2、后台UploadController编写

复制代码代码如下:

package nju.software.xkxt.web.controller;
import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;

import org.springframework.ui.ModelMap;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestMethod;

import org.springframework.web.multipart.MultipartFile;

import org.springframework.web.multipart.MultipartHttpServletRequest;

/**

* @author typ

*

*/

@Controller

public class UploadController {

/**

* 进入下载界面

*

* @param request

* @param response

* @param model

* @return

* @throws IOException

*/

@RequestMapping(value = "upload_enter.do", method = RequestMethod.GET)

public String enter(HttpServletRequest request,

   HttpServletResponse response, ModelMap model) throws IOException {

  // 进入下载界面

  return "upload";

}

/**

* 具体的实现下载功能

*

* @param request

* @param response

* @param model

* @throws IOException

*/

@RequestMapping(value = "upload.do", method = RequestMethod.POST)

public void upload(HttpServletRequest request,

   HttpServletResponse response, ModelMap model) throws IOException {

  MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;

  // 得到上传的文件

  MultipartFile mFile = multipartRequest.getFile("file");

  // 得到上传服务器的路径

  String path = request.getSession().getServletContext()

    .getRealPath("/WEB-INF/upload/");

  // 得到上传的文件的文件名

  String filename = mFile.getOriginalFilename();

  InputStream inputStream = mFile.getInputStream();

  byte[] b = new byte[1048576];

  int length = inputStream.read(b);

  path += "\\" + filename;

  // 文件流写到服务器端

  FileOutputStream outputStream = new FileOutputStream(path);

  outputStream.write(b, 0, length);

  inputStream.close();

  outputStream.close();

}

}

这样就很容易的实现了文件上传的功能

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标签： spring 文件上传

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