亲身实测可用的java实现word/xlsx/pdf文件下载功能

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在SpringMVC的开发过程中，有时需要实现文档的下载功能。word,excel,pdf作为大家最常用的办公程序，它的文件传输就显得尤为重要，本文通过使用spring 提供的Resource封装来实现实现word/xlsx/pdf文件下载功能。话不多说。

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package com.davidwang456;import java.io.File;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.core.io.FileSystemResource;import org.springframework.core.io.Resource;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.bind.annotation.RestController;@RestControllerpublic class DownloadController {	private static final String APPLICATION_PDF="application/pfd";	private static final String APPLICATION_WORD="application/msword";	private static final String APPLICATION_EXCEL="application/vnd.ms-excel;charset=utf-8";		@RequestMapping(value="/download",method=RequestMethod.GET,produces=APPLICATION_PDF)	@ResponseBody	public Resource download(HttpServletRequest req,HttpServletResponse resp) {		String fileName=req.getParameter("file");		File file=getFile(fileName);		String suffix=fileName.substring(fileName.lastIndexOf(".")+1);		if(suffix.equalsIgnoreCase(APPLICATION_PDF)) {			resp.setContentType(APPLICATION_PDF);			resp.setHeader("Content-Disposition", "inline;filename="+file.getName());		}else if(suffix.equalsIgnoreCase(APPLICATION_WORD)) {			resp.setContentType(APPLICATION_WORD);			resp.setHeader("Content-Disposition", "attachment;filename="+file.getName());		}else if(suffix.equalsIgnoreCase(APPLICATION_EXCEL)) {			resp.setContentType(APPLICATION_EXCEL);			resp.setHeader("Content-Disposition", "attachment;filename="+file.getName());		}			resp.setHeader("Content-Length", String.valueOf(file.length()));		return new FileSystemResource(file);	}	private static File getFile(String fileName) {		File file=new File( "path"+fileName);		if(!file.exists()) {			System.out.println("指定路径下的文件不存在！");		}		return file;	}}

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