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SpringMVC——使用對象接收上傳文件——上傳和下載

本文轉載自   查看原文   2019-03-28 10:30   2155    SpringMVC/ Spring+MyBatis企業應用實戰/ SSM

 

/FileUploadTest/src/com/spring/file/bean/User.java

package com.spring.file.bean;

import org.springframework.web.multipart.MultipartFile;

public class User {
    private String username;
    private MultipartFile image;
    public String getUsername() {
        return username;
    }
    public void setUsername(String username) {
        this.username = username;
    }
    public MultipartFile getImage() {
        return image;
    }
    public void setImage(MultipartFile image) {
        this.image = image;
    }
}

/FileUploadTest/WebContent/WEB-INF/content/registerForm.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>用戶注冊</title>
</head>
<body>
    <h2>用戶注冊</h2>
    <form action="register" enctype="multipart/form-data" method="post">
        <table>
            <tr>
                <td>用戶名：</td>
                <td><input type="text" name="username"></td>
            </tr>
            <tr>
                <td>請上傳頭像：</td>
                <td><input type="file" name="image"></td>
            </tr>
            <tr>
                <td><input type="submit" value="注冊"></td>
            </tr>
        </table>
    </form>
</body>
</html>

/FileUploadTest/WebContent/WEB-INF/content/userInfo.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>文件下載</title>
</head>
<body>
<h3>文件下載</h3>
<a href="download?filename=${requestScope.user.image.originalFilename}">
${requestScope.user.image.originalFilename}
</a>
</body>
</html>

/FileUploadTest/src/com/spring/file/controller/FileUploadController.java

package com.spring.file.controller;

import java.io.File;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.io.FileUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.ModelAttribute;
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.spring.file.bean.User;

@Controller
public class FileUploadController {

    @RequestMapping(value="/registerform")
    public String registerForm() {
        return "registerForm";
    }
    /**
     * 上傳頭像
     * @param request
     * @param user
     * @param model
     * @return
     * @throws Exception
     */
    @RequestMapping(value="/register")
    public String register(HttpServletRequest request,
            @ModelAttribute User user,Model model) throws Exception{
        System.out.println(user.getUsername());
        //如果文件不為空，寫入上傳路徑
        if(!user.getImage().isEmpty()) {
            //上傳文件路徑
            String path = request.getServletContext().getRealPath("/images/");
            //上傳文件名
            String filename = user.getImage().getOriginalFilename();
            File filepath = new File(path,filename);
            //判斷文件夾是否存在，若不存在就創建
            if(!filepath.getParentFile().exists()) {
                filepath.getParentFile().mkdirs();
            }
            //將上傳文件保存到一個目標文件中
            user.getImage().transferTo(new File(path+File.separator+filename));
            //將用戶添加到model
            model.addAttribute("user", user);
            return "userInfo";
        }else {
            return "error";
        }
    }
    
    @RequestMapping(value="download")
    public ResponseEntity<byte[]> download(HttpServletRequest request,
            @RequestParam("filename") String filename,Model model) throws Exception{
        //下載文件路徑
        String path = request.getServletContext().getRealPath("/images/");
        File file = new File(path+File.separator+filename);
        HttpHeaders headers = new HttpHeaders();
        //下載顯示的文件名，解決中文亂碼問題
        String downloadFileName = new String(filename.getBytes("UTF-8"),"ISO-8859-1");
        //通知瀏覽器以attachment(下載方式)打開圖片
        headers.setContentDispositionFormData("attachment", downloadFileName);
        //application/octet-stream 二進制流數據（最常見的文件下載）
        headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
        //201 HttpStatus.CREATED
        return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers,HttpStatus.CREATED);
    }
}

/FileUploadTest/WebContent/WEB-INF/web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" 
    id="WebApp_ID" version="3.0">
  <!-- 定義Spring MVC的前端控制器 -->
  <servlet>
      <servlet-name>springmvc</servlet-name>
      <servlet-class>
          org.springframework.web.servlet.DispatcherServlet
      </servlet-class>
      <init-param>
          <param-name>contextConfigLocation</param-name>
          <param-value>/WEB-INF/springmvc-config.xml</param-value>
      </init-param>
      <load-on-startup>1</load-on-startup>
  </servlet>
  <!-- 讓Spring MVC的前端控制器攔截所有請求 -->
  <servlet-mapping>
      <servlet-name>springmvc</servlet-name>
      <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

/FileUploadTest/WebContent/WEB-INF/springmvc-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans 
       http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
       http://www.springframework.org/schema/mvc
       http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd
       http://www.springframework.org/schema/context
       http://www.springframework.org/schema/context/spring-context-4.2.xsd">
       
    <!-- spring可以自動去掃描base-pack下面的包或者子包下面的java文件
                           如果掃描到由Spring相關注解的類，則把這些類注冊為Spring的bean -->
    <context:component-scan base-package="com.spring.file.controller"/>
    
    <!-- 配置annotation類型的處理映射器 -->
    <!-- <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerMapping" /> -->
    
    <!-- 配置annotation類型的處理器適配器 -->
    <!-- <bean class="org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter" /> -->
    
    <!-- 設置配置方案:該配置會自動注冊RequestMappingHandlerMapping和RequestMappingHandlerAdapter -->
    <mvc:annotation-driven/> 
    
    <!-- 視圖解析器 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" >    
        <!-- 前綴 -->
        <property name="prefix">
            <value>/WEB-INF/content/</value>
        </property>
        <!-- 后綴 -->
        <property name="suffix">
           <value>.jsp</value>
        </property>
    </bean>
    
    <!-- 文件上傳配置 -->
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <!-- 上傳文件大小限制，上限為10MB，單位為字節 -->
        <property name="maxUploadSize">
            <value>10485760</value>
        </property>
        <!-- 請求編碼格式，必須和JSP的pageEncoding屬性一致，以便正確讀取表單內容，默認為ISO-8859-1 -->
        <property name="defaultEncoding">
            <value>UTF-8</value>
        </property>
    </bean>
</beans>

測試結果：以360瀏覽器為例

 


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