springboot 实现图片 视频在线看

最近遇到一个问题，上传图片到服务器以后，回显不了，报错404；

历时三天终于找到解决办法：

1.后端代码：

@RestController
@RequestMapping("file")
@SuppressWarnings({"unchecked","rawtypes"})
public class FileController{
	@Autowired
    private ConfigService configService;

/**
	 * 上传文件
	 */

	@RequestMapping("/upload")
	public R upload(@RequestParam("file") MultipartFile file,String type) throws Exception {
		if (file.isEmpty()) {
			throw new EIException("上传文件不能为空");
		}
		String fileExt = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf(".")+1);
//		File path = new File(ResourceUtils.getURL("classpath:static").getPath());
//		if(!path.exists()) {
//		    path = new File("");
//		}
//		File upload = new File(ResourceUtils.getURL("classpath:static").getPath()+"\\upload");
//		if(!upload.exists()) {
//		    upload.mkdirs();
//		}
		String fileName = new Date().getTime()+"."+fileExt;
//这里写自己上传的路径
		File dest = new File("D:\\Edge\\537\\daima\\springboot60zv5\\src\\main\\resources\\static\\upload"+"\\"+fileName);
		file.transferTo(dest);
		if(StringUtils.isNotBlank(type) && type.equals("1")) {
			ConfigEntity configEntity = configService.selectOne(new EntityWrapper<ConfigEntity>().eq("name", "faceFile"));
			if(configEntity==null) {
				configEntity = new ConfigEntity();
				configEntity.setName("faceFile");
				configEntity.setValue(fileName);
			} else {
				configEntity.setValue(fileName);
			}
			configService.insertOrUpdate(configEntity);
		}
		return R.ok().put("file", fileName);
	}





	@IgnoreAuth
	@RequestMapping("/download")
	public ResponseEntity<byte[]> download(@RequestParam String fileName) {
		try {
			File path = new File(ResourceUtils.getURL("classpath:static").getPath());
			if(!path.exists()) {
			    path = new File("");
			}
			File upload = new File(path.getAbsolutePath(),"/upload/");
			if(!upload.exists()) {
			    upload.mkdirs();
			}
			File file = new File(upload.getAbsolutePath()+"/"+fileName);
			if(file.exists()){

/*if(!fileService.canRead(file, SessionManager.getSessionUser())){
					getResponse().sendError(403);
				}*/

				HttpHeaders headers = new HttpHeaders();
			    headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
			    headers.setContentDispositionFormData("attachment", fileName);
			    return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),headers, HttpStatus.CREATED);
			}
		} catch (IOException e) {
			e.printStackTrace();
		}
		return new ResponseEntity<byte[]>(HttpStatus.INTERNAL_SERVER_ERROR);
	}

}

2.前端代码：

<el-form-item class="upload" v-if="type!='info' && !ro.touxiang" label="头像" prop="touxiang">
          <file-upload
          tip="点击上传头像"
          action="file/upload"
          :limit="3"
          :multiple="true"
          :fileUrls="ruleForm.touxiang?ruleForm.touxiang:''"
          @change="touxiangUploadChange"
          ></file-upload>
        </el-form-item>

<template>
  <div>
    <!-- 上传文件组件 -->
    <el-upload
      ref="upload"
      :action="getActionUrl"
      list-type="picture-card"
      :multiple="multiple"
      :limit="limit"
      :headers="myHeaders"
      :file-list="fileList"
      :on-exceed="handleExceed"
      :on-preview="handleUploadPreview"
      :on-remove="handleRemove"
      :on-success="handleUploadSuccess"
      :on-error="handleUploadErr"
      :before-upload="handleBeforeUpload"
    >
      <i class="el-icon-plus"></i>
      <div slot="tip" class="el-upload__tip" style="color:#838fa1;">{{tip}}</div>
    </el-upload>
    <el-dialog :visible.sync="dialogVisible" size="tiny" append-to-body>
      <img width="100%" :src="dialogImageUrl" alt>
    </el-dialog>
  </div>
</template>
<script>
import storage from "@/utils/storage";
import base from "@/utils/base";
export default {
  data() {
    return {
      // 查看大图
      dialogVisible: false,
      // 查看大图
      dialogImageUrl: "",
      // 组件渲染图片的数组字段，有特殊格式要求
      fileList: [],
      fileUrlList: [],
      myHeaders:{}
    };
  },
  props: ["tip", "action", "limit", "multiple", "fileUrls"],
  mounted() {
    this.init();
    this.myHeaders= {
      'Token':storage.get("Token")
    }
  },
  watch: {
    fileUrls: function(val, oldVal) {
      //   console.log("new: %s, old: %s", val, oldVal);
      this.init();
    }
  },
  computed: {
    // 计算属性的 getter
    getActionUrl: function() {
      // return base.url + this.action + "?token=" + storage.get("token");
      return `/${this.$base.name}/` + this.action;
    }
  },
  methods: {
    // 初始化
    init() {
      //   console.log(this.fileUrls);
      if (this.fileUrls) {
        this.fileUrlList = this.fileUrls.split(",");
        let fileArray = [];
        this.fileUrlList.forEach(function(item, index) {
          var url = item;
          var name = index;
          var file = {
            name: name,
            url: url
          };
          fileArray.push(file);
        });
        this.setFileList(fileArray);
      }
    },
    handleBeforeUpload(file) {
	
    },
    // 上传文件成功后执行
    handleUploadSuccess(res, file, fileList) {
      if (res && res.code === 0) {
        fileList[fileList.length - 1]["url"] =
          this.$base.url + "upload/" + file.response.file;
        this.setFileList(fileList);
        this.$emit("change", this.fileUrlList.join(","));
      } else {
        this.$message.error(res.msg);
      }
    },
    // 图片上传失败
    handleUploadErr(err, file, fileList) {
      this.$message.error("文件上传失败");
    },
    // 移除图片
    handleRemove(file, fileList) {
      this.setFileList(fileList);
      this.$emit("change", this.fileUrlList.join(","));
    },
    // 查看大图
    handleUploadPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 限制图片数量
    handleExceed(files, fileList) {
      this.$message.warning(`最多上传${this.limit}张图片`);
    },
    // 重新对fileList进行赋值
    setFileList(fileList) {
      var fileArray = [];
      var fileUrlArray = [];
      // 有些图片不是公开的，所以需要携带token信息做权限校验
      var token = storage.get("token");
      fileList.forEach(function(item, index) {
        var url = item.url.split("?")[0];
        var name = item.name;
        var file = {
          name: name,
          url: url + "?token=" + token
        };
        fileArray.push(file);
        fileUrlArray.push(url);
      });
      this.fileList = fileArray;
      this.fileUrlList = fileUrlArray;
    }
  }
};
</script>
<style lang="scss" scoped>
</style>

<template>
  <div>
    <!-- 图片上传组件辅助-->
    <el-upload
      class="avatar-uploader"
      :action="getActionUrl"
      name="file"
      :headers="header"
      :show-file-list="false"
      :on-success="uploadSuccess"
      :on-error="uploadError"
      :before-upload="beforeUpload"
    ></el-upload>

    <quill-editor
      class="editor"
      v-model="value"
      ref="myQuillEditor"
      :options="editorOption"
      @blur="onEditorBlur($event)"
      @focus="onEditorFocus($event)"
      @change="onEditorChange($event)"
    ></quill-editor>
  </div>
</template>
<script>
// 工具栏配置
const toolbarOptions = [
  ["bold", "italic", "underline", "strike"], // 加粗 斜体 下划线 删除线
  ["blockquote", "code-block"], // 引用  代码块
  [{ header: 1 }, { header: 2 }], // 1、2 级标题
  [{ list: "ordered" }, { list: "bullet" }], // 有序、无序列表
  [{ script: "sub" }, { script: "super" }], // 上标/下标
  [{ indent: "-1" }, { indent: "+1" }], // 缩进
  // [{'direction': 'rtl'}],                         // 文本方向
  [{ size: ["small", false, "large", "huge"] }], // 字体大小
  [{ header: [1, 2, 3, 4, 5, 6, false] }], // 标题
  [{ color: [] }, { background: [] }], // 字体颜色、字体背景颜色
  [{ font: [] }], // 字体种类
  [{ align: [] }], // 对齐方式
  ["clean"], // 清除文本格式
  ["link", "image", "video"] // 链接、图片、视频
];

import { quillEditor } from "vue-quill-editor";
import "quill/dist/quill.core.css";
import "quill/dist/quill.snow.css";
import "quill/dist/quill.bubble.css";

export default {
  props: {
    /*编辑器的内容*/
    value: {
      type: String
    },
    action: {
      type: String
    },
    /*图片大小*/
    maxSize: {
      type: Number,
      default: 4000 //kb
    }
  },

  components: {
    quillEditor
  },

  data() {
    return {
      content: this.value,
      quillUpdateImg: false, // 根据图片上传状态来确定是否显示loading动画，刚开始是false,不显示
      editorOption: {
        placeholder: "",
        theme: "snow", // or 'bubble'
        modules: {
          toolbar: {
            container: toolbarOptions,
            // container: "#toolbar",
            handlers: {
              image: function(value) {
                if (value) {
                  // 触发input框选择图片文件
                  document.querySelector(".avatar-uploader input").click();
                } else {
                  this.quill.format("image", false);
                }
              }
              // link: function(value) {
              //   if (value) {
              //     var href = prompt('请输入url');
              //     this.quill.format("link", href);
              //   } else {
              //     this.quill.format("link", false);
              //   }
              // },
            }
          }
        }
      },
      // serverUrl: `${base.url}sys/storage/uploadSwiper?token=${storage.get('token')}`, // 这里写你要上传的图片服务器地址
      header: {
        // token: sessionStorage.token
       'Token': this.$storage.get("Token")
      } // 有的图片服务器要求请求头需要有token
    };
  },
  computed: {
    // 计算属性的 getter
    getActionUrl: function() {
      // return this.$base.url + this.action + "?token=" + this.$storage.get("token");
      return `/${this.$base.name}/` + this.action;
    }
  },
  methods: {
    onEditorBlur() {
      //失去焦点事件
    },
    onEditorFocus() {
      //获得焦点事件
    },
    onEditorChange() {
      console.log(this.value);
      //内容改变事件
      this.$emit("input", this.value);
    },
    // 富文本图片上传前
    beforeUpload() {
      // 显示loading动画
      this.quillUpdateImg = true;
    },

    uploadSuccess(res, file) {
      // res为图片服务器返回的数据
      // 获取富文本组件实例
      let quill = this.$refs.myQuillEditor.quill;
      // 如果上传成功
      if (res.code === 0) {
        // 获取光标所在位置
        let length = quill.getSelection().index;
        // 插入图片  res.url为服务器返回的图片地址
        quill.insertEmbed(length, "image", this.$base.url+ "upload/" +res.file);
        // 调整光标到最后
        quill.setSelection(length + 1);
      } else {
        this.$message.error("图片插入失败");
      }
      // loading动画消失
      this.quillUpdateImg = false;
    },
    // 富文本图片上传失败
    uploadError() {
      // loading动画消失
      this.quillUpdateImg = false;
      this.$message.error("图片插入失败");
    }
  }
};
</script> 

<style>
.editor {
  line-height: normal !important;
  height: 400px;
}
.ql-snow .ql-tooltip[data-mode="link"]::before {
  content: "请输入链接地址:";
}
.ql-snow .ql-tooltip.ql-editing a.ql-action::after {
  border-right: 0px;
  content: "保存";
  padding-right: 0px;
}

.ql-snow .ql-tooltip[data-mode="video"]::before {
  content: "请输入视频地址:";
}

.ql-snow .ql-picker.ql-size .ql-picker-label::before,
.ql-snow .ql-picker.ql-size .ql-picker-item::before {
  content: "14px";
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="small"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="small"]::before {
  content: "10px";
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="large"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="large"]::before {
  content: "18px";
}
.ql-snow .ql-picker.ql-size .ql-picker-label[data-value="huge"]::before,
.ql-snow .ql-picker.ql-size .ql-picker-item[data-value="huge"]::before {
  content: "32px";
}

.ql-snow .ql-picker.ql-header .ql-picker-label::before,
.ql-snow .ql-picker.ql-header .ql-picker-item::before {
  content: "文本";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="1"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="1"]::before {
  content: "标题1";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="2"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="2"]::before {
  content: "标题2";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="3"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="3"]::before {
  content: "标题3";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="4"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="4"]::before {
  content: "标题4";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="5"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="5"]::before {
  content: "标题5";
}
.ql-snow .ql-picker.ql-header .ql-picker-label[data-value="6"]::before,
.ql-snow .ql-picker.ql-header .ql-picker-item[data-value="6"]::before {
  content: "标题6";
}

.ql-snow .ql-picker.ql-font .ql-picker-label::before,
.ql-snow .ql-picker.ql-font .ql-picker-item::before {
  content: "标准字体";
}
.ql-snow .ql-picker.ql-font .ql-picker-label[data-value="serif"]::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value="serif"]::before {
  content: "衬线字体";
}
.ql-snow .ql-picker.ql-font .ql-picker-label[data-value="monospace"]::before,
.ql-snow .ql-picker.ql-font .ql-picker-item[data-value="monospace"]::before {
  content: "等宽字体";
}
</style>

3.解决404问题的关键：
 

package com.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.ResourceHandlerRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;

import com.interceptor.AuthorizationInterceptor;

@Configuration
public class InterceptorConfig extends WebMvcConfigurationSupport{
	
	@Bean
    public AuthorizationInterceptor getAuthorizationInterceptor() {
        return new AuthorizationInterceptor();
    }
	
	@Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(getAuthorizationInterceptor()).addPathPatterns("/**").excludePathPatterns("/static/**");
        super.addInterceptors(registry);
	}
	
	/**
	 * springboot 2.0配置WebMvcConfigurationSupport之后，会导致默认配置被覆盖，要访问静态资源需要重写addResourceHandlers方法
	 */
	@Override
    public void addResourceHandlers(ResourceHandlerRegistry registry) {
	/*	registry.addResourceHandler("/**")
        .addResourceLocations("classpath:/resources/")
        .addResourceLocations("classpath:/static/")
        .addResourceLocations("classpath:/admin/")
        .addResourceLocations("classpath:/front/")
        .addResourceLocations("classpath:/public/");
		super.addResourceHandlers(registry);*/
		registry.addResourceHandler("/**")
				.addResourceLocations("classpath:/resources/")
				.addResourceLocations("classpath:/static/")
				.addResourceLocations("classpath:/upload/")
				.addResourceLocations("classpath:/admin/")
				.addResourceLocations("classpath:/front/")
				.addResourceLocations("classpath:/public/");
		registry.addResourceHandler("/upload/**").addResourceLocations("file:D:\\Edge\\537\\daima\\springboot60zv5\\src\\main\\resources\\static\\upload\\");
		super.addResourceHandlers(registry);

    }
}

需要再config中写下这段代码；

• registry.addResourceHandler("/upload/**")：这行代码使用了registry对象（可能是ResourceHandlerRegistry或类似的注册表），向其中添加一个资源处理器。
• "/upload/**"：这是一个路径模式，表示要匹配的资源路径。/**表示匹配任意子路径，所以/upload/及其子路径下的资源都会被这个处理器处理。
• .addResourceLocations("file:D:\\Edge\\537\\daima\\springboot60zv5\\src\\main\\resources\\static\\upload\\")：这行代码指定了资源的位置。在这个例子中，资源位于本地文件系统的指定路径中。

综合起来，这段代码的作用是将所有对/upload/及其子路径的请求都路由到本地文件系统的指定路径中。这样，当发送/upload/或其下的请求时，服务器将会返回该路径下的文件。

registry.addResourceHandler("/upload/**").addResourceLocations("file:D:\\Edge\\537\\daima\\springboot60zv5\\src\\main\\resources\\static\\upload\\");