Spring Boot 使用wangEditor实现图片上传

绝地灬酷狼 2022-06-04 01:48 707阅读 0赞

# Spring Boot 使用wangEditor实现图片上传 #

我们在进行web开发时经常会涉及到图片上传的问题，特别是利用富文本编辑器进行图片上传，业界也有很多的富文本编辑器，有ueditor、fckeditor、wangEditor。这里我们选择wangEditor作为示例，因为wangEditor是一个轻量级的富文本编辑器已经可以满足我们大部分的需求。这里结合spring boot实现图片上传，有了图片上传其实文件的上传也是一回事了。

# wangEditor #

目前wangEditor已经时v3版本了，这里给出链接[wangEditor][]，上面有详细的介绍。

# spring boot #

我们依然采用spring boot作为服务端开发  
首先我们在resources目录添加了一个configure.properties文件里面只有一行，定义了我们上传文件存储的目录

> \#用于存储系统中可能涉及到的各种配置信息  
> material.upload\_dir=/home/jacky/upload-dir

与之对应的我们构建一个类来加载配置文件

package com.material.config;
    
    import org.springframework.boot.context.properties.ConfigurationProperties;
    import org.springframework.context.annotation.Configuration;
    
    @Configuration
    @ConfigurationProperties(prefix = "material")
    public class MaterialConfig { 
        private String upload_dir;
    
        public String getUpload_dir() {
            return upload_dir;
        }
    
        public void setUpload_dir(String upload_dir) {
            this.upload_dir = upload_dir;
        }
    }

我们利用spring boot官方提供的文件上传示例来进行文件上传  
首先构建文件上传的业务类

package com.material.common.service;
    
    import org.springframework.core.io.Resource;
    import org.springframework.web.multipart.MultipartFile;
    
    import java.nio.file.Path;
    import java.util.stream.Stream;
    
    public interface StorageService { 
    
        void init();
    
        String store(MultipartFile file);
    
        Stream<Path> loadAll();
    
        Path load(String filename);
    
        Resource loadAsResource(String filename);
    
        void deleteAll();
    
    }
    
    package com.material.common.service;
    
    import com.material.common.exception.StorageException;
    import com.material.common.exception.StorageFileNotFoundException;
    import com.material.config.MaterialConfig;
    import com.material.util.RandomUtil;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.core.io.Resource;
    import org.springframework.core.io.UrlResource;
    import org.springframework.stereotype.Service;
    import org.springframework.util.FileSystemUtils;
    import org.springframework.util.StringUtils;
    import org.springframework.web.multipart.MultipartFile;
    
    import java.io.IOException;
    import java.net.MalformedURLException;
    import java.nio.file.Files;
    import java.nio.file.Path;
    import java.nio.file.Paths;
    import java.nio.file.StandardCopyOption;
    import java.util.stream.Stream;
    
    @Service
    public class FileSystemStorageService implements StorageService { 
    
        private final Path rootLocation;
    
        @Autowired
        public FileSystemStorageService(MaterialConfig materialConfig) {
            this.rootLocation = Paths.get(materialConfig.getUpload_dir());
        }
    
        //存储文件
        @Override
        public String store(MultipartFile file) {
            String filename = StringUtils.cleanPath(file.getOriginalFilename());
            try {
                if (file.isEmpty()) {
                    throw new StorageException("Failed to store empty file " + filename);
                }
                if (filename.contains("..")) {
                    // This is a security check
                    throw new StorageException(
                            "Cannot store file with relative path outside current directory "
                                    + filename);
                }
                String storeFileName = RandomUtil.getRandomFileName() + filename.substring(filename.indexOf("."), filename.length());
                Files.copy(file.getInputStream(), this.rootLocation.resolve(storeFileName),
                        StandardCopyOption.REPLACE_EXISTING);
                return storeFileName;
            } catch (IOException e) {
                throw new StorageException("Failed to store file " + filename, e);
            }
        }
    
        //加载所有文件的路径
        @Override
        public Stream<Path> loadAll() {
            try {
                return Files.walk(this.rootLocation, 1)
                        .filter(path -> !path.equals(this.rootLocation))
                        .map(path -> this.rootLocation.relativize(path));
            } catch (IOException e) {
                throw new StorageException("Failed to read stored files", e);
            }
    
        }
    
        //加载指定文件的路径
        @Override
        public Path load(String filename) {
            return rootLocation.resolve(filename);
        }
    
        //加载指定文件为资源用于返回客户端
        @Override
        public Resource loadAsResource(String filename) {
            try {
                Path file = load(filename);
                Resource resource = new UrlResource(file.toUri());
                if (resource.exists() || resource.isReadable()) {
                    return resource;
                } else {
                    throw new StorageFileNotFoundException(
                            "Could not read file: " + filename);
    
                }
            } catch (MalformedURLException e) {
                throw new StorageFileNotFoundException("Could not read file: " + filename, e);
            }
        }
    
        @Override
        public void deleteAll() {
            FileSystemUtils.deleteRecursively(rootLocation.toFile());
        }
    
        @Override
        public void init() {
            try {
                Files.createDirectories(rootLocation);
            } catch (IOException e) {
                throw new StorageException("Could not initialize storage", e);
            }
        }
    }

这是spring boot官方提供业务类，下面我们来看controller，官方提供的controller用了lambda表达式

package com.material.common.controller;
    
    import com.material.cltx.entity.SecondleveldescEntity;
    import com.material.common.exception.StorageFileNotFoundException;
    import com.material.common.service.StorageService;
    import com.material.util.UploadResult;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.core.io.Resource;
    import org.springframework.http.HttpHeaders;
    import org.springframework.http.ResponseEntity;
    import org.springframework.stereotype.Controller;
    import org.springframework.ui.Model;
    import org.springframework.web.bind.annotation.*;
    import org.springframework.web.multipart.MultipartFile;
    import org.springframework.web.servlet.mvc.method.annotation.MvcUriComponentsBuilder;
    import org.springframework.web.servlet.mvc.support.RedirectAttributes;
    
    import java.io.IOException;
    import java.util.stream.Collectors;
    
    @Controller
    @RequestMapping("/upload")
    public class FileUploadController {
    
        @Autowired
        private StorageService storageService;
    
        //加载所有已上传文件的路径并传递到页面
        @GetMapping("")
        public String listUploadedFiles(Model model) throws IOException {
    
            model.addAttribute("files", storageService.loadAll().map(
                    path -> MvcUriComponentsBuilder.fromMethodName(FileUploadController.class,
                            "serveFile", path.getFileName().toString()).build().toString())
                    .collect(Collectors.toList()));
    
            return "test/upload";
        }
    
        //显示指定的文件
        @GetMapping("/files/{filename:.+}")
        @ResponseBody
        public ResponseEntity<Resource> serveFile(@PathVariable String filename) {
    
            Resource file = storageService.loadAsResource(filename);
            return ResponseEntity.ok().header(HttpHeaders.CONTENT_DISPOSITION,
                    "attachment; filename=\"" + file.getFilename() + "\"").body(file);
        }
    
        //文件上传
        @PostMapping("/")
        @ResponseBody
        public UploadResult handleFileUpload(@RequestParam("file") MultipartFile file,
                                             RedirectAttributes redirectAttributes) {
            String storeFileName = storageService.store(file);
            UploadResult result = new UploadResult();
            result.setErrno(0);
            result.getData().add(MvcUriComponentsBuilder.fromMethodName
                    (FileUploadController.class, "serveFile", storeFileName).build().toString());
            return result;
        }
    }

前台jsp页面，是的我们还是用的jsp/手动滑稽

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8" %>
    <%@ taglib prefix="spring" uri="http://www.springframework.org/tags" %>
    <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
    <!DOCTYPE html>
    <html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>文件上传页面</title>
    </head>
    
    <body>
    <div>
        <p>已上传图片</p>
        <c:forEach items="${files }" var="file">
            <img src="${file}" width="500px">
            <p>${file}</p>
        </c:forEach>
    </div>
    <div >
        <div id="editor">
            <p>wangEditor 富文本编辑器</p>
        </div>
    </div>
    <script type="text/javascript" src="../../js/lib/wangEditor/wangEditor.min.js"></script>
    <script type="text/javascript"> var E = window.wangEditor var editor = new E('#editor') // 或者 var editor = new E( document.getElementById('#editor') ) editor.customConfig.uploadImgServer = '/upload/'; //设置上传的参数名 editor.customConfig.uploadFileName = 'file'; // 隐藏“网络图片”tab editor.customConfig.showLinkImg = false; // 将图片大小限制为 10M editor.customConfig.uploadImgMaxSize = 10 * 1024 * 1024; editor.create(); </script>
    </body>
    </html>

在jsp页面我们也能看到我们怎样通过wangEditor来构建一个富文本编辑器并实现图片上传，当然wangEditor提供了很多操作的方法：例如获取编辑器的值等，具体的参见官方手册  
这样利用spring boot和wangEditor实现图片上传就完成了，大家可以自己测试

[wangEditor]: https://www.kancloud.cn/wangfupeng/wangeditor3/332599