扣丁学堂java培训简述java中Spring boot实现文件
本文实例为大家分享了Springboot实现文件上传的具体代码，供大家参考，具体内容如下
1.创建一个Maven的web工程，然后配置pom.xml文件，增加依赖：
org.springframework.boot
spring-boot-starter-web
1.0.2.RELEASE
2.在webapp目录下的index.jsp文件中输入一个表单：
Filetoupload:
Name:
Pressheretouploadthefile!
这个表单就是我们模拟的上传页面
3.编写处理这个表单的Controller：
importjava.io.BufferedOutputStream;
importjava.io.File;
importjava.io.FileOutputStream;
importorg.springframework.stereotype.Controller;
importorg.springframework.web.bind.annotation.RequestMapping;
importorg.springframework.web.bind.annotation.RequestMethod;
importorg.springframework.web.bind.annotation.RequestParam;
importorg.springframework.web.bind.annotation.ResponseBody;
importorg.springframework.web.multipart.MultipartFile;
@Controller
publicclassFileUploadController{
@RequestMapping(value="/upload",method=RequestMethod.GET)
public@ResponseBodyStringprovideUploadInfo(){
return"YoucanuploadafilebypostingtothissameURL.";
}
@RequestMapping(value="/upload",method=RequestMethod.POST)
public@ResponseBodyStringhandleFileUpload(@RequestParam("name")Stringname,
@RequestParam("file")MultipartFilefile){
if(!file.isEmpty()){
try{
byte[]bytes=file.getBytes();
BufferedOutputStreamstream=
newBufferedOutputStream(newFileOutputStream(newFile(name+"-uploaded")));
stream.write(bytes);
stream.close();
return"Yousuccessfullyuploaded"+name+"into"+name+"-uploaded!";
}catch(Exceptione){
return"Youfailedtoupload"+name+"=>"+e.getMessage();
}
}else{
return"Youfailedtoupload"+name+"becausethefilewasempty.";
}
}
}
4.然后我们对上传的文件做一些限制，同时编写main方法来启动这个web：
importorg.springframework.boot.SpringApplication;
importorg.springframework.boot.autoconfigure.EnableAutoConfiguration;
importorg.springframework.boot.context.embedded.MultiPartConfigFactory;
importorg.springframework.context.annotation.Bean;
importorg.springframework.context.annotation.ComponentScan;
importorg.springframework.context.annotation.Configuration;
importjavax.servlet.MultipartConfigElement;
@Configuration
@ComponentScan
@EnableAutoConfiguration
publicclassApplication{
@Bean
publicMultipartConfigElementmultipartConfigElement(){
MultiPartConfigFactoryfactory=newMultiPartConfigFactory();
factory.setMaxFileSize("128KB");
factory.setMaxRequestSize("128KB");
returnfactory.createMultipartConfig();
}
publicstaticvoidmain(String[]args){
SpringApplication.run(Application.class,args);
}
}
5.然后访问http://localhost:8080/upload就可以看到页面了。
上面的例子是实现的是单个文件上传的功能，假定我们现在要实现文件批量上传的功能的话，我们只需要简单的修改一下上面的代码就行，考虑到篇幅的问题，下面只是贴出和上面不同的代码，没有贴出的说明和上面一样。：
1.新增batchUpload.jsp文件
action="/batch/upload">
Filetoupload:
Filetoupload:
Pressheretouploadthefile!
2.新增BatchFileUploadController.java文件：
importorg.springframework.stereotype.Controller;
importorg.springframework.web.bind.annotation.RequestMapping;
importorg.springframework.web.bind.annotation.RequestMethod;
importorg.springframework.web.bind.annotation.ResponseBody;
importorg.springframework.web.multipart.MultipartFile;
importorg.springframework.web.multipart.MultipartHttpServletRequest;
importjavax.servlet.http.HttpServletRequest;
importjava.io.BufferedOutputStream;
importjava.io.File;
importjava.io.FileOutputStream;
importjava.util.List;
/**
*Createdbywenchao.renon2014/4/26.
*/
@Controller
publicclassBatchFileUploadController{
@RequestMapping(value="/batch/upload",method=RequestMethod.POST)
public@ResponseBody
StringhandleFileUpload(HttpServletRequestrequest){
Listfiles=((MultipartHttpServletRequest)request).getFiles("file");
for(inti=0;i
MultipartFilefile=files.get(i);
Stringname=file.getName();
if(!file.isEmpty()){
try{
byte[]bytes=file.getBytes();
BufferedOutputStreamstream=
newBufferedOutputStream(newFileOutputStream(newFile(name+i)));
stream.write(bytes);
stream.close();
}catch(Exceptione){
return"Youfailedtoupload"+name+"=>"+e.getMessage();
}
}else{
return"Youfailedtoupload"+name+"becausethefilewasempty.";
}
}
return"uploadsuccessful";
}
}
这样一个简单的批量上传文件的功能就ok了，是不是很简单啊。以上就是扣丁学堂为大家带来的java中Spring boot实现文件上传功能，如果你对java感兴趣的话，请登录扣丁学堂官网，或者关注微信公众号，大量java在线视频教程等你来观看！
