index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<a href="download.do?fileName=mybatis-3.5.3.rar">文件下载</a>
</body>
</html>
TestController
package controller;
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 javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
@Controller
public class TestController {
@RequestMapping("test.do")
public String test(){
System.out.println("test好用啦");
return "welcome.jsp";
}
//原生方式处理文件的上传
// @RequestMapping("upload.do")
// public String upload(HttpServletRequest request) throws Exception {
// //获取磁盘文件选项的factory
// DiskFileItemFactory factory = new DiskFileItemFactory();
// //创建一个ServletFileUpload对象
// ServletFileUpload upload = new ServletFileUpload(factory);
// //让upload对象帮我们去解析request(目的获取数据)
// List<FileItem> itemList = upload.parseRequest(request);
// //遍历所有的文件项
// for(FileItem item : itemList){
// //每次循环判断一下当前item是文件还是普通表单对象
// if(item.isFormField()){//普通表单数据
// String key = item.getFieldName();
// String value = item.getString("UTF-8");
// System.out.println(key+"--"+value);
// }else{//文件数据
// String fileName = item.getName();//名字可以自己弄一个规则 确保文件名唯一 UUID
// item.write(new File("D://test//",fileName));
// }
// }
// return "welcome.jsp";
// }
//文件上传的时候需要一个临时存储
//factory.setSizeThreshold(1024000);//设置缓存大小
//factory.setRepository(new File("路径"));
//基于SpringMVC方式的文件上传
@RequestMapping("upload.do")
public String upload(String text, MultipartFile upload) throws IOException {
System.out.println("新的controller执行啦");
System.out.println(text);
//文件名字
String fileName = upload.getOriginalFilename();
//文件对象
//upload对象帮我们做传输
upload.transferTo(new File("D://test//",fileName));
return "welcome.jsp";
}
//=================================================================================
//原生方式
// @RequestMapping("download.do")
// public void download(HttpServletRequest request,HttpServletResponse response) throws Exception {
// //1.获取请求传递过来的文件名
// String fileName = request.getParameter("fileName");
// //2.直接创建文件输入流读取文件
// InputStream inputStream = new FileInputStream("D://test//"+fileName);
// //3.做响应啦----设置
// // 如果服务端存储的文件名字含有中文，需要处理一下
// fileName = URLEncoder.encode(fileName,"UTF-8");
// // 响应信息头
// response.setContentType("application/x-msdownload");
// response.setHeader("Content-disposition","attachment;filename="+fileName);
// //4.正式开始写数据(输出流)
// OutputStream outputStream = response.getOutputStream();
// byte[] b = new byte[1024];
// int length = inputStream.read(b);//读取有效字节个数
// while(length!=-1){
// outputStream.write(b,0,length);
// outputStream.flush();
// length = inputStream.read(b);
// }
// }
//基于SpringMVC方式实现下载
@RequestMapping("download.do")
public ResponseEntity<byte[]> download(String fileName) throws Exception {//fileName变量 名字是框架帮我们注入进去的 帮我们组合成了String
//获取读取文件即可
File file = new File("D://test//"+fileName);
//设置响应信息相关
// 如果有中文 需要处理
fileName = new String(fileName.getBytes("UTF-8"),"ISO-8859-1");
//设置响应的请求头为文件格式
HttpHeaders headers = new HttpHeaders();
//MediaType.APPLICATION_OCTET_STREAM静态常量 ==> application/x-msdownload
headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
headers.setContentDispositionFormData("attachment",fileName);
//将响应信息存入一个返回值对象内即可----ResponseEntity
byte[] b = FileUtils.readFileToByteArray(file);//使用byte字节数组读取file文件
return new ResponseEntity(b,headers,HttpStatus.CREATED);
}
}
网友评论