spring mvc下載文件簡紹和常見問題

1. 使用Servlet API 原生方式下載

//設置編碼爲UTF-8
	@RequestMapping(value = "/downTemplate",produces="text/html;charset=UTF-8")
	public void downTemplate(HttpServletResponse response) throws FileNotFoundException {
		//獲取文件(web項目中獲取絕對地址)
		File file = ResourceUtils.getFile( ResourceUtils.CLASSPATH_URL_PREFIX+"templates/事件測試.xlsx" );
		//設置下載響應頭
		response.addHeader("Content-Disposition", "attachment;fileName=" + "x.xlsx");// 設置文件名
		try {
			//複製及寫到響應流中
			byte[] bytes = FileUtils.readFileToByteArray( file );
			IOUtils.write( bytes,response.getOutputStream() );
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

2. 使用Spring MVC封裝的方式下載

3. 使用Maven時Excel等資源文件損壞問題

<!-- 解決Excel文件損毀問題 -->
<plugin>
	<groupId>org.apache.maven.plugins</groupId>
	<artifactId>maven-resources-plugin</artifactId>
	<configuration>
		<encoding>UTF-8</encoding>
		<nonFilteredFileExtensions>
			<nonFilteredFileExtension>xlsx</nonFilteredFileExtension>
			<nonFilteredFileExtension>xls</nonFilteredFileExtension>
		</nonFilteredFileExtensions>
	</configuration>
</plugin>

4. VUE下載文件

down(){
	axios.get('/event/collectEvent/downTemplate',{
		//設置響應體(必須)
		responseType: 'blob'
	}).then(res => {
		let url = window.URL.createObjectURL(new Blob([res]))
		let link = document.createElement('a')
		link.style.display = 'none'
		link.href = url
		link.setAttribute('download', 'excel.xlsx')
		document.body.appendChild(link)
		link.click()
	})
		.catch(err => {
		console.log(err);
	})
}