springmvc上传图片并显示--支持多图片上传

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";  
        }  
}

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";  
        }  
} 
原文地址:https://www.cnblogs.com/aqsunkai/p/6690646.html