通过POI预览文件（上传空间demo）

# demo-upload
预览功能，预览word以及excel，原理是通过POI将word转为html进行展示
预览：
http://localhost:8080/preview

此项工作主要是针对word和excel的前期工作：
1.  在C盘新建tempFiles文件夹，里面放入相应文件，文件名称参照preview.jsp中的文件名
2. 本地C盘需要提前建立好文件夹tempFiles，如果是在linux则需要在home下建立tempFiles(路径不能错，因为代码暂时固化了)

3. tomcat的server.xml需要配置虚拟路径(如果是用springboot项目则可以在代码里对内置的tomcat进行虚拟路径配置)
<Context path="/file"  docBase="C:\tempFiles" debug="0" reloadable="true"/>或者
<Context path="/file"  docBase="/home/tempFiles" debug="0" reloadable="true"/>

package com.example.demo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class DemoUploadApplication {

	public static void main（String[] args） {
		SpringApplication.run（DemoUploadApplication.class args）;
	}
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2018-08-03 07:06  demo-upload-master\
     文件         355  2018-08-03 07:06  demo-upload-master\.gitignore
     文件         766  2018-08-03 07:06  demo-upload-master\README.md
     文件        3312  2018-08-03 07:06  demo-upload-master\pom.xml
     目录           0  2018-08-03 07:06  demo-upload-master\src\
     目录           0  2018-08-03 07:06  demo-upload-master\src\main\
     目录           0  2018-08-03 07:06  demo-upload-master\src\main\java\
     目录           0  2018-08-03 07:06  demo-upload-master\src\main\java\com\
     目录           0  2018-08-03 07:06  demo-upload-master\src\main\java\com\example\
     目录           0  2018-08-03 07:06  demo-upload-master\src\main\java\com\example\demo\
     文件         316  2018-08-03 07:06  demo-upload-master\src\main\java\com\example\demo\DemoUploadApplication.java
     文件       25903  2018-08-03 07:06  demo-upload-master\src\main\java\com\example\demo\POIUtil.java
     文件       11353  2018-08-03 07:06  demo-upload-master\src\main\java\com\example\demo\PreviewController.java
     文件         559  2018-08-03 07:06  demo-upload-master\src\main\java\com\example\demo\WebMvcConfig.java
     目录           0  2018-08-03 07:06  demo-upload-master\src\main\resources\
     文件         167  2018-08-03 07:06  demo-upload-master\src\main\resources\application.properties
     目录           0  2018-08-03 07:06  demo-upload-master\src\main\webapp\
     目录           0  2018-08-03 07:06  demo-upload-master\src\main\webapp\WEB-INF\
     文件           0  2018-08-03 07:06  demo-upload-master\src\main\webapp\WEB-INF\web.xml
     目录           0  2018-08-03 07:06  demo-upload-master\src\main\webapp\js\
     文件       93064  2018-08-03 07:06  demo-upload-master\src\main\webapp\js\jquery-1.10.1.min.js
     文件       10644  2018-08-03 07:06  demo-upload-master\src\main\webapp\preview.jsp
     目录           0  2018-08-03 07:06  demo-upload-master\src\test\
     目录           0  2018-08-03 07:06  demo-upload-master\src\test\java\
     目录           0  2018-08-03 07:06  demo-upload-master\src\test\java\com\
     目录           0  2018-08-03 07:06  demo-upload-master\src\test\java\com\example\
     目录           0  2018-08-03 07:06  demo-upload-master\src\test\java\com\example\demo\
     文件         337  2018-08-03 07:06  demo-upload-master\src\test\java\com\example\demo\DemoUploadApplicationTests.java