SpringMVC 文件上传

SpringMVC 文件上传

<!--支持文件上传-->
<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <!--maxUploadSizePerFile：单个文件大小限制
    maxUploadSize:整个请求大小限制-->
    <property name="maxUploadSizePerFile" value="#{10*1024*1024}"/>
    <property name="maxUploadSize" value="#{100*1024*1024}"/>
</bean>
       

package com.tobie.upfile;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.ModelAttribute;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;

import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.Map;

/**
 * @author Tobieance
 * @description 上传控制器
 * @date 2023-09-14 11:37
 */
@Controller
@RequestMapping("/upload")
public class UploadController {
    /**
     * <h2>单文件上传</h2>
     *
     * @param file     文件
     * @param modelMap 模型映射
     * @return {@link String}
     * @throws IOException
     */
    @RequestMapping("/upload1")
    public String upload1(@RequestParam("file1") MultipartFile file, ModelMap modelMap) throws IOException {
        System.out.println(file);
        //获取文件名
        String originalFileName = file.getOriginalFilename();
        System.out.println(originalFileName);
        //设置保存文件路径
        String path = String.format("E:\\%s", originalFileName);
        //创建上传文件实例
        File destFile = new File(path);
        //写文件
        file.transferTo(destFile);
        String message = String.format("上传文件<b>%s</b>至<b>%s</b><br/>成功！", originalFileName, path);
        modelMap.addAttribute("msg", message);
        return "result";
    }

    /**
     * <h2>多文件处理（仅文件）</h2>
     *
     * @param file1    文件1
     * @param file2    文件2
     * @param modelMap 模型映射
     * @return {@link String}
     * @throws IOException
     */
    @RequestMapping("/upload2")
    public String upload2(MultipartFile file1, MultipartFile file2, ModelMap modelMap) throws IOException {
        System.out.println(file1);
        System.out.println(file2);
        //具体实现与案例1相似
        //获取文件名
        String originalFileName1 = file1.getOriginalFilename();
        String originalFileName2 = file1.getOriginalFilename();
        System.out.println(originalFileName1);
        System.out.println(originalFileName2);
        //设置保存文件路径
        String path1 = String.format("E:\\%s", originalFileName1);
        String path2 = String.format("E:\\%s", originalFileName2);
        //创建上传文件实例
        File destFile1 = new File(path1);
        File destFile2 = new File(path2);
        //写文件
        file1.transferTo(destFile1);
        file2.transferTo(destFile2);
        String message = String.format("上传文件 <b>%s</b> 至 <b>%s</b> 成功！<br/>" +
                "上传文件 <b>%s</b> 至 <b>%s</b> 成功！", originalFileName1, path1, originalFileName2, path2);
        modelMap.addAttribute("msg", message);
        return "result";
    }


    /**
     * <h2>多文件处理（带普通控件）</h2>
     *
     * @param request
     * @param modelMap
     * @return {@link String}
     * @throws IOException
     */
    @RequestMapping("/upload3")
    public String upload3(MultipartHttpServletRequest request, ModelMap modelMap) throws IOException {
        //TODO:获取普通控件数据
        System.out.println("---------获取普通控件数据--------");
        //key：控件的name属性 value：控件属性值（可能有多个值）
        Map<String, String[]> parameterMap = request.getParameterMap();
        parameterMap.forEach((name, values) -> {
            System.out.println(String.format("%s:%s", name, Arrays.asList(values)));
        });
        //TODO:获取文件数据
        //key：控件的name属性 value：文件数据
        MultiValueMap<String, MultipartFile> multiValueMap = request.getMultiFileMap();
        multiValueMap.forEach((name, file) -> {
            System.out.println(String.format("%s:\n%s", name, file));
        });
        String message = String.format("上传文件成功!");
        modelMap.addAttribute("msg", message);
        return "result";
    }

    @RequestMapping("/upload4")
    public String upload4(@ModelAttribute("msg")UserDto userDto) throws IOException {
        System.out.println(userDto);
        return "result";
    }

}