最近在学习SpringBoot,以下是最近学习整理的实现文件上传下载的Java代码:
1、开发环境:
IDEA15+ Maven+JDK1.8
2、新建一个maven工程:
3、工程框架
4、pom.xml文件依赖项
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< project xmlns = "http://maven.apache.org/POM/4.0.0" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd" > < modelVersion >4.0.0</ modelVersion > < groupId >SpringWebContent</ groupId > < artifactId >SpringWebContent</ artifactId > < packaging >war</ packaging > < version >1.0-SNAPSHOT</ version > < name >SpringWebContent Maven Webapp</ name > < url >http://maven.apache.org</ url > < parent > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-parent</ artifactId > < version >1.4.3.RELEASE</ version > </ parent > < dependencies > < dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-starter-thymeleaf</ artifactId > </ dependency > < dependency > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-devtools</ artifactId > < optional >true</ optional > </ dependency > < dependency > < groupId >junit</ groupId > < artifactId >junit</ artifactId > < version >3.8.1</ version > < scope >test</ scope > </ dependency > </ dependencies > < properties > < java.version >1.8</ java.version > </ properties > < build > < finalName >SpringWebContent</ finalName > < plugins > < plugin > < groupId >org.springframework.boot</ groupId > < artifactId >spring-boot-maven-plugin</ artifactId > </ plugin > </ plugins > </ build > </ project > |
5、Application.java
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import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class Application { public static void main(String[] args) { SpringApplication.run(Application. class , args); } } |
6、FileController.java
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import org.springframework.stereotype.Controller; import org.springframework.ui.Model; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.*; import java.util.List; @Controller public class FileController { @RequestMapping ( "/greeting" ) public String greeting( @RequestParam (value= "name" , required= false , defaultValue= "World" ) String name, Model model) { model.addAttribute( "name" , name); return "greeting" ; } private static final Logger logger = LoggerFactory.getLogger(FileController. class ); //文件上传相关代码 @RequestMapping (value = "upload" ) @ResponseBody public String upload( @RequestParam ( "test" ) MultipartFile file) { if (file.isEmpty()) { return "文件为空" ; } // 获取文件名 String fileName = file.getOriginalFilename(); logger.info( "上传的文件名为:" + fileName); // 获取文件的后缀名 String suffixName = fileName.substring(fileName.lastIndexOf( "." )); logger.info( "上传的后缀名为:" + suffixName); // 文件上传后的路径 String filePath = "E://test//" ; // 解决中文问题,liunx下中文路径,图片显示问题 // fileName = UUID.randomUUID() + suffixName; File dest = new File(filePath + fileName); // 检测是否存在目录 if (!dest.getParentFile().exists()) { dest.getParentFile().mkdirs(); } try { file.transferTo(dest); return "上传成功" ; } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return "上传失败" ; } //文件下载相关代码 @RequestMapping ( "/download" ) public String downloadFile(org.apache.catalina.servlet4preview.http.HttpServletRequest request, HttpServletResponse response){ String fileName = "FileUploadTests.java" ; if (fileName != null ) { //当前是从该工程的WEB-INF//File//下获取文件(该目录可以在下面一行代码配置)然后下载到C:\\users\\downloads即本机的默认下载的目录 String realPath = request.getServletContext().getRealPath( "//WEB-INF//" ); File file = new File(realPath, fileName); if (file.exists()) { response.setContentType( "application/force-download" ); // 设置强制下载不打开 response.addHeader( "Content-Disposition" , "attachment;fileName=" + fileName); // 设置文件名 byte [] buffer = new byte [ 1024 ]; FileInputStream fis = null ; BufferedInputStream bis = null ; try { fis = new FileInputStream(file); bis = new BufferedInputStream(fis); OutputStream os = response.getOutputStream(); int i = bis.read(buffer); while (i != - 1 ) { os.write(buffer, 0 , i); i = bis.read(buffer); } System.out.println( "success" ); } catch (Exception e) { e.printStackTrace(); } finally { if (bis != null ) { try { bis.close(); } catch (IOException e) { e.printStackTrace(); } } if (fis != null ) { try { fis.close(); } catch (IOException e) { e.printStackTrace(); } } } } } return null ; } //多文件上传 @RequestMapping (value = "/batch/upload" , method = RequestMethod.POST) @ResponseBody public String handleFileUpload(HttpServletRequest request) { List<MultipartFile> files = ((MultipartHttpServletRequest) request) .getFiles( "file" ); MultipartFile file = null ; BufferedOutputStream stream = null ; for ( int i = 0 ; i < files.size(); ++i) { file = files.get(i); if (!file.isEmpty()) { try { byte [] bytes = file.getBytes(); stream = new BufferedOutputStream( new FileOutputStream( new File(file.getOriginalFilename()))); stream.write(bytes); stream.close(); } catch (Exception e) { stream = null ; return "You failed to upload " + i + " => " + e.getMessage(); } } else { return "You failed to upload " + i + " because the file was empty." ; } } return "upload successful" ; } |
7、index.html
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<!DOCTYPE html> < html lang = "en" > < head > < title >Getting Started: Serving Web Content</ title > < meta http-equiv = "Content-Type" content = "text/html; charset=UTF-8" /> </ head > < body > < p >Get your greeting < a href = "/greeting" rel = "external nofollow" >here</ a ></ p > < form action = "/upload" method = "POST" enctype = "multipart/form-data" > 文件:< input type = "file" name = "test" /> < input type = "submit" /> </ form > < a href = "/download" rel = "external nofollow" >下载test</ a > < p >多文件上传</ p > < form method = "POST" enctype = "multipart/form-data" action = "/batch/upload" > < p >文件1:< input type = "file" name = "file" /></ p > < p >文件2:< input type = "file" name = "file" /></ p > < p >< input type = "submit" value = "上传" /></ p > </ form > </ html > |
完整工程地址:SpringWebContent.rar
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:http://blog.csdn.net/coding13/article/details/54577076