13-SpringBoot——Spring MVC基础-高级配置-文件上传_使用commonsmultipartfile接收文件

Spring MVC基础-高级配置-文件上传

【博文目录>>>】

【项目源码>>>】

【文件上传】

文件上传是一个项目里经常要用的功能， Spring MVC 通过配置一个MultipartResolver 来上传文件。在Spring 的控制器中，通过MultipartFile file 来接收文件，通过MultipartFile[] files 接收多个文件上传。

在Spring MVC中，文件上传变得非常简单，通过CommonsMultipartResolver可以控制文件上传的一些属性，比如设置文件上传的最大大小，文件的编码格式等等。

【代码实现】

package com.example.spring.framework.advance.configuration.controller;

import org.apache.commons.io.FileUtils;
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.ResponseBody;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;

/**
 * ①使用MultipartFile file 接受上传的文件。
 * ②使用FileUtils. writeByteArrayToFile 快速写文件到磁盘。
 * Author: 王俊超
 * Date: 2017-07-12 07:56
 * All Rights Reserved !!!
 */
@Controller
public class UploadController {
    @RequestMapping(value = "/upload", method = RequestMethod.POST)
    public @ResponseBody
    String upload(MultipartFile file) { // 1
        try {
            FileUtils.writeByteArrayToFile(
                    new File("e:/upload/" + file.getOriginalFilename()),
                    file.getBytes()); // 2
            return "ok";
        } catch (IOException e) {
            e.printStackTrace();
            return "wrong";
        }
    }
}
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package com.example.spring.framework.advance.configuration.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.multipart.MultipartResolver;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.ViewControllerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.view.InternalResourceViewResolver;
import org.springframework.web.servlet.view.JstlView;

/**
 * Author: 王俊超
 * Date: 2017-07-12 07:22
 * All Rights Reserved !!!
 */
@Configuration
@EnableWebMvc
@ComponentScan("com.example.spring.framework.advance.configuration")
public class MyMvcConfig extends WebMvcConfigurerAdapter{
    @Bean
    public InternalResourceViewResolver viewResolver() {
        InternalResourceViewResolver viewResolver = new InternalResourceViewResolver();
        viewResolver.setPrefix("/WEB-INF/classes/views/");
        viewResolver.setSuffix(".jsp");
        viewResolver.setViewClass(JstlView.class);

        return viewResolver;
    }

    @Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {

        registry.addResourceHandler("/assets/**").addResourceLocations("classpath:/assets/");
        super.addResourceHandlers(registry);
    }


    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/index").setViewName("/index");
        registry.addViewController("/toUpload").setViewName("/upload");
    }

    @Bean
    public MultipartResolver multipartResolver() {
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver();
        multipartResolver.setMaxUploadSize(1000000);
        return multipartResolver;
    }
}
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package com.example.spring.framework.advance.configuration;

import com.example.spring.framework.advance.configuration.config.MyMvcConfig;
import org.springframework.web.WebApplicationInitializer;
import org.springframework.web.context.support.AnnotationConfigWebApplicationContext;
import org.springframework.web.servlet.DispatcherServlet;

import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRegistration;

/**
 * Author: 王俊超
 * Date: 2017-07-11 21:51
 * All Rights Reserved !!!
 */
public class WebInitializer implements WebApplicationInitializer {
    @Override
    public void onStartup(ServletContext servletContext) throws ServletException {
        AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
        ctx.register(MyMvcConfig.class);
        ctx.setServletContext(servletContext);

        ServletRegistration.Dynamic servlet = servletContext.addServlet("dispatcher",
                new DispatcherServlet(ctx));
        servlet.addMapping("/");
        servlet.setLoadOnStartup(1);
    }
}
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<%@ page language="java" contentType="text/html; charset=UTF-8"
         pageEncoding="UTF-8" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>upload page</title>
</head>
<body>


<div class="upload">
    <form action="upload" enctype="multipart/form-data" method="post">
        <input type="file" name="file"/><br/>
        <input type="submit" value="上传">
    </form>
</div>


</body>
</html>
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