Spring4 MVC 多文件上传(图片并展示)

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&nbsp;码:</label><input type="password" name="password"/><br/>
    <label>头&nbsp;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";
    }
}

1

点击提交控制台输出:

Users [name=fileupload, password=test]

2

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&nbsp;码:</label><input type="password" name="password"/><br/>
    <label>头&nbsp;像1</label><input type="file" name="file"/><br/>
    <label>头&nbsp;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";
    }
}

3

4

posted @ 2015-12-28 17:33  星辰之力  阅读(3554)  评论(0编辑  收藏  举报