springmvc文件上传

pom.xml在添加springmvc相关的依赖后，添加

<!-- 文件上传 -->
<dependency>
	<groupId>commons-fileupload</groupId>
	<artifactId>commons-fileupload</artifactId>
	<version>1.3.1</version>
	<scope>compile</scope>
</dependency>

在springmvc的xml中配置:

<!-- 文件上传的 xml 配置 -->
<bean id="multipartResolver" 
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="defaultEncoding" value="utf-8"></property>
    <!-- 最大10m -->
    <property name="maxUploadSize" value="10485760000"></property>
</bean>

该bean的id必须为multipartResolver

控制器上传:

package com.sp.controller;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

import com.sp.service.UpDownService;

@Controller
@RequestMapping("upload")
public class UploadController {

    @Resource
    private UpDownService upDownService;

    @RequestMapping("signal")
    public String signalUpload(@RequestParam("file") MultipartFile file, HttpServletRequest request,
            ModelMap modelMap) {
        modelMap = upDownService.singalUpload(request, file, modelMap);
        return "/upload/result";
    }

    @RequestMapping("mult")
    public String multUpload(@RequestParam MultipartFile[] files, HttpServletRequest request, ModelMap modelMap) {
        modelMap = upDownService.multUpload(request, files, modelMap);
        return "/upload/result";
    }
}

service:

package com.sp.service;

import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import org.springframework.ui.ModelMap;
import org.springframework.web.multipart.MultipartFile;

@Service
public class UpDownService {

    private static final Logger logger = LoggerFactory.getLogger(UpDownService.class);

    // 单文件上传
    public ModelMap singalUpload(HttpServletRequest request, MultipartFile muFile, ModelMap modelMap) {
        List<String> fileUrls = new ArrayList<String>();
        List<String> err = new ArrayList<String>();
        String path = request.getSession().getServletContext().getRealPath("upload") + "/";
        String fileName = muFile.getOriginalFilename();
        File targetFile = new File(path, fileName);
        if (!targetFile.exists()) {
            targetFile.mkdirs();
        }

        try {
            muFile.transferTo(targetFile);
        } catch (IllegalStateException | IOException e) {
            e.printStackTrace();
            modelMap.addAttribute("uploadRes", false);
            logger.error(fileName + "-------上传失败");
            err.add(fileName + "-------上传失败");
            return modelMap;
        }
        fileUrls.add(request.getContextPath() + "/upload/" + muFile.getOriginalFilename());
        modelMap.addAttribute("fileUrls", fileUrls);
        modelMap.addAttribute("uploadRes", true);
        return modelMap;
    }

    // 多文件上传
    public ModelMap multUpload(HttpServletRequest request, MultipartFile[] muFiles, ModelMap modelMap) {
        String path = request.getSession().getServletContext().getRealPath("upload") + "/";
        List<String> fileUrls = new ArrayList<String>();
        List<String> err = new ArrayList<String>();
        for (MultipartFile multipartFile : muFiles) {
            String fileName = multipartFile.getOriginalFilename();
            File targetFile = new File(path, fileName);
            if (!targetFile.exists()) {
                targetFile.mkdirs();
            }

            // 保存文件
            try {
                multipartFile.transferTo(targetFile);
            } catch (IllegalStateException | IOException e) {
                e.printStackTrace();
                modelMap.addAttribute("uploadRes", false);
                logger.error(multipartFile.getOriginalFilename() + "-------上传失败");
                err.add(multipartFile.getOriginalFilename() + "-------上传失败");
                continue;
            }
            fileUrls.add(request.getContextPath() + "/upload/" + multipartFile.getOriginalFilename());
            modelMap.addAttribute("fileUrls", fileUrls);
            modelMap.addAttribute("uploadRes", true).addAttribute("err", err);
        }
        return modelMap;
    }
}

jsp页面

单文件上传:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>单文件上传</title>
</head>
<body>
<form action="/springmvcfunction/upload/signal" method="POST" enctype="multipart/form-data">
	<input type="file" name="file" />
	<input type="submit" value="Submit" />
</form>
</body>
</html>

多文件上传:

<%@ 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>单文件上传</title>
</head>
<body>
<form action="/springmvcfunction/upload/mult" method="POST" enctype="multipart/form-data">
	<input type="file" name="files" />
	<input type="file" name="files" />
	<input type="submit" value="Submit" />
</form>
</body>
</html>

接收结果的jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
	pageEncoding="UTF-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!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>上传结果</title>
</head>
<body>
	<h1>file resutlt</h1>
	<c:if test="${uploadRes == true}">
		<c:forEach items="${fileUrls}" var="item">
			<img src="${item }">
			<br />
		</c:forEach>
	</c:if>
	
	<c:if test="${uploadRes == false }">
        <h1>文件上传失败</h1>
        <c:forEach items="${err}" var="item">
            <h2>${item}</h2>
            <br />
        </c:forEach>
    </c:if>
</body>
</html>