springmvc上传图片并显示图片--支持多图片上传

时间：2016-09-11 17:12:08 阅读：234 评论：0 收藏：0 [点我收藏+]

标签：

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：

[java] view plain copy

<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）：

[html] view plain copy

<mvc:annotation-driven/>
<mvc:resources location="/static/" mapping="/static/**" />
<context:component-scan base-package="com.ztz.springmvc.controller"/>
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/>
<property name="prefix" value="/WEB-INF/jsp/"/>
<property name="suffix" value=".jsp"/>
</bean>
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
<property name="defaultEncoding" value="utf-8"/>
<property name="maxInMemorySize" value="10240"/>
<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

[java] view plain copy

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：

[java] view plain copy

<%@ 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：

[java] view plain copy

<%@ 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：

[java] view plain copy

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";
}
}

技术分享

点击提交控制台输出：

Users [name=fileupload, password=test]

浏览器显示结果：

技术分享

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

[java] view plain copy

<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

[java] view plain copy

<body>
<c:forEach items="${imagesPathList}" var="image">
<img src="${basePath}${image}"><br/>
</c:forEach>
</body>

控制层代码如下：

[java] view plain copy

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";
}
}