springmvc上传图片并显示图片--支持多图片上传
Posted 林加欣
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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:
- <dependency>
- <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}${imagesPath}">
- </body>
- </html>
最后是Controller:
- package com.ztz.springmvc.controller;
- import java.io.File;
- import java.util.UUID;
- import javax.servlet.http.HttpServletRequest;
- import org.springframework.stereotype.Controller;
- import org.springframework.web.bind.annotation.RequestMapping;
- import org.springframework.web.bind.annotation.RequestMethod;
- import org.springframework.web.bind.annotation.RequestParam;
- import org.springframework.web.multipart.MultipartFile;
- import com.ztz.springmvc.model.Users;
- @Controller
- @RequestMapping("/file")
- public class FileUploadController {
- @RequestMapping(value="/upload",method=RequestMethod.POST)
- private String fildUpload(Users users ,@RequestParam(value="file",required=false) MultipartFile file,
- HttpServletRequest request)throws Exception{
- //基本表单
- System.out.println(users.toString());
- //获得物理路径webapp所在路径
- String pathRoot = request.getSession().getServletContext().getRealPath("");
- String path="";
- if(!file.isEmpty()){
- //生成uuid作为文件名称
- String uuid = UUID.randomUUID().toString().replaceAll("-","");
- //获得文件类型(可以判断如果不是图片,禁止上传)
- String contentType=file.getContentType();
- //获得文件后缀名称
- String imageName=contentType.substring(contentType.indexOf("/")+1);
- path="/static/images/"+uuid+"."+imageName;
- file.transferTo(new File(pathRoot+path));
- }
- System.out.println(path);
- request.setAttribute("imagesPath", path);
- return "success";
- }
- //因为我的JSP在WEB-INF目录下面,浏览器无法直接访问
- @RequestMapping(value="/forward")
- private String forward(){
- return "index";
- }
- }
点击提交控制台输出:
Users [name=fileupload, password=test]
浏览器显示结果:
二、 多图片上传
springmvc实现多图片上传也很简单,我们把刚才的例子修改下,在加一个文件域,name的值还是相同
- <body>
- <form action="${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1</label><input type="file" name="file"/><br/>
- <label>头 像2</label><input type="file" name="file"/><br/>
- <input type="submit" value="提 交"/>
- </form>
- </body>
展示图片来个循环,以便显示多张图片
- <body>
- <c:forEach items="${imagesPathList}" var="image">
- <img src="${basePath}${image}"><br/>
- </c:forEach>
- </body>
控制层代码如下:
- package com.ztz.springmvc.controller;
- import java.io.File;
- import java.util.ArrayList;
- import java.util.List;
- 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="";
- List<String> listImagePath=new ArrayList<String>();
- for (MultipartFile mf : file) {
- if(!mf.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=mf.getContentType();
- //获得文件后缀名称
- String imageName=contentType.substring(contentType.indexOf("/")+1);
- path="/static/images/"+uuid+"."+imageName;
- mf.transferTo(new File(pathRoot+path));
- listImagePath.add(path);
- }
- }
- System.out.println(path);
- request.setAttribute("imagesPathList", listImagePath);
- 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";
- }
- }
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