从零搭建自己的SpringBoot后台框架(十六)

刺骨的言语ヽ痛彻心扉 2023-08-17 15:32 54阅读 0赞

在一个系统中，文件上传模块肯定是少不了的，例如头像上传，展示轮播图等等，所以本章我们来添加上传文件功能

### 一：添加commons-fileupload依赖 ###

打开pom文件添加

<dependency>
       <groupId>commons-fileupload</groupId>
       <artifactId>commons-fileupload</artifactId>
       <version>1.3.1</version>
    </dependency>

### 二：添加系统变量 ###

打开core→constant文件，添加文件保存路径

//文件上传储存的地址
    public static final String SAVEFILEPATH = "F://img";

### 三：添加文件上传限制 ###

创建core→configurer→MultipartConfigurer.java

package com.example.demo.core.configurer;
    
    import org.springframework.boot.web.servlet.MultipartConfigFactory;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    import javax.servlet.MultipartConfigElement;
    
    @Configuration
    public class MultipartConfigurer {
    
        @Bean
        public MultipartConfigElement multipartConfigElement(){
            MultipartConfigFactory factory=new MultipartConfigFactory();
            factory.setMaxFileSize("10MB");
            factory.setMaxRequestSize("10MB");
            return factory.createMultipartConfig();
        }
    }

### 四：创建文件上传工具类 ###

创建core→utils→UploadActionUtil.java

package com.example.demo.core.utils;
    
    import com.example.demo.core.constant.ProjectConstant;
    import org.springframework.web.multipart.MultipartFile;
    import org.springframework.web.multipart.MultipartHttpServletRequest;
    import org.springframework.web.multipart.commons.CommonsMultipartResolver;
    
    import javax.servlet.http.HttpServletRequest;
    import java.io.File;
    import java.text.SimpleDateFormat;
    import java.util.*;
    
    /**
     * @author phubing
     * 文件上传控制器
     */
    public class UploadActionUtil {
    
       public static List<String> uploadFile(HttpServletRequest request) throws Exception {
          List<String> list = new ArrayList<>();
          CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(
                request.getSession().getServletContext());
          if (multipartResolver.isMultipart(request)) {
             MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
             Iterator<String> iterator = multiRequest.getFileNames();
             while (iterator.hasNext()) {
                // 取得上传文件
                MultipartFile file = multiRequest.getFile(iterator.next());
                if (file != null) {
                   // 取得当前上传文件的文件名称
                   String myFileName = file.getOriginalFilename();
                   // 如果名称不为“”,说明该文件存在，否则说明该文件不存在
                   if (myFileName.trim() != "") {
                      String fileTyps = myFileName.substring(myFileName.lastIndexOf("."));
                      // String tempName="demo"+fileTyps;
                      String tempName = UUID.randomUUID().toString() + fileTyps;
                      // 创建文件夹
                      String folderPath = ProjectConstant.SAVEFILEPATH + File.separator + folderName();
                      File fileFolder = new File(folderPath);
                      if (!fileFolder.exists() && !fileFolder.isDirectory()) {
                         fileFolder.mkdir();
                      }
                      File uploadFile = new File(folderPath + File.separator + tempName);
                      file.transferTo(uploadFile);
                      myFileName = folderName() + File.separator + tempName;
                      list.add(ProjectConstant.SAVEFILEPATH + "//" + myFileName);
                   }
                }
             }
          }
          return list;
       }
    
       /**
        * 得年月日的文件夹名称
        * 
        * @return
        */
       public static String getCurrentFilderName()  throws Exception{
          Calendar now = Calendar.getInstance();
          return now.get(Calendar.YEAR) + "" + (now.get(Calendar.MONTH) + 1) + "" + now.get(Calendar.DAY_OF_MONTH);
       }
    
       /**
        * 创建文件夹
        * 
        * @param filderName
        */
       public static void createFilder(String filderName) throws Exception {
          File file = new File(filderName);
          // 如果文件夹不存在则创建
          if (!file.exists() && !file.isDirectory()) {
             file.mkdirs();
          }
       }
    
       /**
        * 文件扩展名
        * 
        * @param fileName
        * @return
        */
       public static String extFile(String fileName)  throws Exception{
          return fileName.substring(fileName.lastIndexOf("."));
       }
    
       /**
        * 当前日期当文件夹名
        * 
        * @return
        */
       public static String folderName() throws Exception {
          SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd");
          String str = sdf.format(new Date());
          return str;
       }
    }

### 五：创建UploadFileController ###

package com.example.demo.controller;
    
    import com.example.demo.core.ret.RetResponse;
    import com.example.demo.core.ret.RetResult;
    import com.example.demo.core.utils.UploadActionUtil;
    import org.springframework.web.bind.annotation.PostMapping;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    import javax.servlet.http.HttpServletRequest;
    import java.util.List;
    
    @RestController
    @RequestMapping("/uploadFile")
    public class UploadFileController {
    
        @PostMapping("/upload")
        public RetResult<List<String>> upload(HttpServletRequest httpServletRequest) throws Exception {
            List<String> list = UploadActionUtil.uploadFile(httpServletRequest);
            return RetResponse.makeOKRsp(list);
        }
    }

### 六：测试 ###

打开postman

输入localhost:8080/uploadFile/upload

注意：请求参数如下

![format_png][]

返回值为文件存储的路径

打开设置好的存储路径

![format_png 1][]

ok，上传成功

[format_png]: /images/20230810/493c55ce4b104ddc93a842a620647a5a.png
[format_png 1]: /images/20230810/41130256552f4605897fb7f1c53a8677.png