springmvc上传图片并显示图片--支持多图片上传

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实现上传图片功能在Springmvc中很好实现。现在我将会展现完整例子。 开始需要在pom.xml加入几个jar,分别是:

			<groupId>commons-fileupload</groupId>
			<artifactId>commons-fileupload</artifactId>
			<version>1.3.1</version>
		</dependency>
		<dependency>
			<groupId>commons-io</groupId>
			<artifactId>commons-io</artifactId>
			<version>2.4</version>
		</dependency>

接下来,在Springmvc的配置加入上传文件的配置(PS:我把springmvc的完整配置都展现出来):

	<!--默认的mvc注解映射的支持 -->
	<mvc:annotation-driven/>
	<!-- 处理对静态资源的请求 -->
	<mvc:resources location="/static/" mapping="/static/**" />
	<!-- 扫描注解 -->
	<context:component-scan base-package="com.ztz.springmvc.controller"/>
	<!-- 视图解析器 -->
	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> 
        <!-- 前缀 -->
		<property name="prefix" value="/WEB-INF/jsp/"/>
		<!-- 后缀 -->
		<property name="suffix" value=".jsp"/>
	</bean>
	<!-- 上传文件 -->
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<property name="defaultEncoding" value="utf-8"/>
		<!-- 最大内存大小 -->
		<property name="maxInMemorySize" value="10240"/>
		<!-- 最大文件大小,-1为不限制大小 -->
		<property name="maxUploadSize" value="-1"/>
	</bean>

一、 单文件上传 当然在一个表单中,需要添加enctype="multipart/form-data",一个表单有文件域,肯定也有基本的文本框,可以一次性提交,springmvc能给我们区别出来,来做不同的处理。首先看下普通的model

package com.ztz.springmvc.model;

public class Users {
	private String name;
	private String password;
	//省略get set方法
	
	//重写toString()方便测试
	@Override
	public String toString() {
		return "Users [name=" + name + ", password=" + password +  "]";
	}
}


这个是表单的JSP页面:

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
request.setAttribute("basePath", basePath);
%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>FileUpload</title>
</head>
<body>
<form action="${basePath}file/upload" method="post" enctype="multipart/form-data">
	<label>用户名:</label><input type="text" name="name"/><br/>
	<label>密 码:</label><input type="password" name="password"/><br/>
	<label>头 像</label><input type="file" name="file"/><br/>
	<input type="submit" value="提  交"/>
</form>
</body>
</html>

上传成功跳转的JSP页面,并且显示出上传图片:

<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jstl/core_rt" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
request.setAttribute("basePath", basePath);
%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>头像</title>
</head>
<body>
<img src="${basePath}${imagesPath}">
</body>
</html>

最后是Controller:



package com.ztz.springmvc.controller;

import java.io.File;
import java.util.UUID;

import javax.servlet.http.HttpServletRequest;

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

import com.ztz.springmvc.model.Users;

@Controller
@RequestMapping("/file")
public class FileUploadController {
	
	@RequestMapping(value="/upload",method=RequestMethod.POST)
	private String fildUpload(Users users ,@RequestParam(value="file",required=false) MultipartFile file,
			HttpServletRequest request)throws Exception{
		//基本表单
		System.out.println(users.toString());
		
		//获得物理路径webapp所在路径
		String pathRoot = request.getSession().getServletContext().getRealPath("");
		String path="";
		if(!file.isEmpty()){
			//生成uuid作为文件名称
			String uuid = UUID.randomUUID().toString().replaceAll("-","");
			//获得文件类型(可以判断如果不是图片,禁止上传)
			String contentType=file.getContentType();
			//获得文件后缀名称
			String imageName=contentType.substring(contentType.indexOf("/")+1);
			path="/static/images/"+uuid+"."+imageName;
			file.transferTo(new File(pathRoot+path));
		}
		System.out.println(path);
		request.setAttribute("imagesPath", path);
		return "success";
	}
	//因为我的JSP在WEB-INF目录下面,浏览器无法直接访问
	@RequestMapping(value="/forward")
	private String forward(){
		return "index";
	}
}

alt

点击提交控制台输出: Users [name=fileupload, password=test]

浏览器显示结果:

alt

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