亲身实测可用的java实现word/xlsx/pdf文件下载功能

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。

o

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;
@RestController
public 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;
	}
}