关于java文件【下载中文文件名乱码】问题解决方案

前面一篇文章讲了：基于MAVEN项目——如何上传于下载文件
如今碰见一个问题：上传中文命名的图片，下载显示不了中文名称：

解决效果：

解决步骤：
第一步：
sping-mvc.xml部分代码:

<!-- 上传文件的处理器 -->
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		<!-- 设置默认编码 解决了上传文件名乱码的问题 -->
		<property name="defaultEncoding" value="utf-8"></property>
		<!-- 上传图片最大大小5M -->
		<property name="maxUploadSize" value="5242440"></property>
	</bean>

第二步：

FileController.java中文文件名获取代码:

• 获取浏览器格式
• 根据不一样浏览器控制文件名编码格式

String userAgent = request.getHeader("User-Agent");//获取浏览器名（IE/Chome/firefox）
if(userAgent.contains("MSIE")||userAgent.contains("Trident")) {//针对IE或IE为内核的浏览器
	fileName=java.net.URLEncoder.encode(fileName,"UTF-8");
	}else {
		fileName=new String(fileName.getBytes("UTF-8"),"ISO-8859-1");//谷歌控制版本
}
headers.setContentDispositionFormData("attachment", fileName);// 默认下载文件名为原始文件名

其余浏览器控制字符格式：（详细）

String userAgent = request.getHeader("User-Agent");//获取浏览器名（IE/Chome/firefox）
if (userAgent.contains("firefox")) {    
      fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1"); // firefox浏览器 
    } else if (userAgent.contains("MSIE")) {    
     fileName = URLEncoder.encode(fileName, "UTF-8");// IE浏览器 
    }else if (userAgent.contains("CHROME")) {    
     fileName = new String(fileName.getBytes("UTF-8"), "ISO8859-1");// 谷歌 
  }  
headers.setContentDispositionFormData("attachment", fileName);// 默认下载文件名为原始文件名 

FileController.java所有代码:（我用的浏览器chome）

package com.cungudafa.spingmvc01.controller;

import java.io.File;
import java.io.IOException;
import java.sql.SQLException;
import java.util.List;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.commons.io.FileUtils;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.multipart.MultipartFile;

import com.cungudafa.spingmvc01.bean.FileInfo;
import com.cungudafa.spingmvc01.dao.FileInfoDao;
import com.cungudafa.spingmvc01.dao.impl.FileInfoDaoImpl;
import com.cungudafa.spingmvc01.util.FileUtil;

/** * 处理文件的类 * * @author Administrator * */
@Controller
@RequestMapping("/file")
public class FileController {

	@RequestMapping("/uploadtest")
	public String upload(MultipartFile uploadFile) throws IOException {
		System.out.println("uploadFile = " + uploadFile);
		// 得到上传字节数
		byte[] buf = uploadFile.getBytes();
		System.out.println("上传文件大小：" + buf.length);
		// 得到上传文件名称
		System.out.println("上传文件名称getName = " + uploadFile.getName());
		System.out.println("上传文件名称getOriginalFilename = " + uploadFile.getOriginalFilename());
		return "index";
	}

	@RequestMapping("/upload")
	public String toUpload() {
		return "upload";
	}

	@RequestMapping("/files")
	public String files(HttpSession session) {
		FileInfoDao dao = new FileInfoDaoImpl();
		try {
			List<FileInfo> files = dao.findFiles();// 查找数据库所有内容
			session.setAttribute("list", files);// 所有文件显示页面，用list能够调出数据库表
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "files";
	}

	@RequestMapping("/doUpload")
	public String upload(MultipartFile uploadFile, HttpServletRequest request) throws IOException {
		System.out.println("uploadFile = " + uploadFile);
		// 得到文件
		byte[] buf = uploadFile.getBytes();
		System.out.println("文件长度" + buf.length);
		// 文件名
		System.out.println("文件名getName = " + uploadFile.getName());
		System.out.println("文件名getOriginalFilename = " + uploadFile.getOriginalFilename());

		// 文件名 a.txt
		String originalFileName = uploadFile.getOriginalFilename();
		// 时间戳
		String time = FileUtil.createFileTimestamp();
		// 文件url /upload/1231231231231a.txt
		String fileUrl = "/upload/" + time + originalFileName;
		fileUrl = request.getServletContext().getRealPath(fileUrl);
		System.out.println("fileUrl = " + fileUrl);
		// 向url地址存储文件
		FileUtil.writeFileToUrl(uploadFile, fileUrl);

		// 向数据库中保存文件信息
		FileInfo fileInfo = new FileInfo();
		fileInfo.setFileName(originalFileName);
		fileInfo.setFileUrl(fileUrl);

		FileInfoDao dao = new FileInfoDaoImpl();
		try {
			dao.addFileInfo(fileInfo);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return "user";
	}

	@RequestMapping("/download")
	public ResponseEntity<byte[]> download(Integer fileId,HttpServletRequest request) {
		FileInfoDao dao = new FileInfoDaoImpl();
		try {
			FileInfo fileInfo = dao.findFileById(fileId);// 按学号查找文件记录类
			String fileUrl = fileInfo.getFileUrl();
			String fileName = fileInfo.getFileName();
			HttpHeaders headers = new HttpHeaders();// http协议
			String userAgent = request.getHeader("User-Agent");
			if(userAgent.contains("MSIE")||userAgent.contains("Trident")) {
				fileName=java.net.URLEncoder.encode(fileName,"UTF-8");
			}else {
				fileName=new String(fileName.getBytes("UTF-8"),"ISO-8859-1");
			}
			headers.setContentDispositionFormData("attachment", fileName);// 默认下载文件名为原始文件名
			headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);// 媒体流下载

			ResponseEntity<byte[]> entity = new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(new File(fileUrl)),
					headers, HttpStatus.CREATED);// 二进制转换为实体类型
			return entity;
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
}