Spring boot实现文件上传功能_Java教程

本文实例为大家分享了spring boot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：

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									<dependency> 

									 <groupid>org.springframework.boot</groupid> 

									 <artifactid>spring-boot-starter-web</artifactid> 

									 <version>1.0.2.release</version> 

									</dependency>

2. 在webapp目录下的index.jsp文件中输入一个表单：

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									<html> 

									<body> 

									<form method="post" enctype="multipart/form-data" action="/upload"> 

									 file to upload: <input type="file" name="file"><br /> 

									 name: <input type="text" name="name"><br /> <br /> 

									 <input type="submit" value="upload"> 

									  press here to upload the file! 

									</form> 

									</body>

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：

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									import java.io.bufferedoutputstream; 

									import java.io.file; 

									import java.io.fileoutputstream; 

									import org.springframework.stereotype.controller; 

									import org.springframework.web.bind.annotation.requestmapping; 

									import org.springframework.web.bind.annotation.requestmethod; 

									import org.springframework.web.bind.annotation.requestparam; 

									import org.springframework.web.bind.annotation.responsebody; 

									import org.springframework.web.multipart.multipartfile; 

									@controller

									public class fileuploadcontroller { 

									 @requestmapping(value="/upload", method=requestmethod.get) 

									 public @responsebody string provideuploadinfo() { 

									  return "you can upload a file by posting to this same url."; 

									 } 

									 @requestmapping(value="/upload", method=requestmethod.post) 

									 public @responsebody string handlefileupload(@requestparam("name") string name, 

									   @requestparam("file") multipartfile file){ 

									  if (!file.isempty()) { 

									   try { 

									    byte[] bytes = file.getbytes(); 

									    bufferedoutputstream stream = 

									      new bufferedoutputstream(new fileoutputstream(new file(name + "-uploaded"))); 

									    stream.write(bytes); 

									    stream.close(); 

									    return "you successfully uploaded " + name + " into " + name + "-uploaded !"; 

									   } catch (exception e) { 

									    return "you failed to upload " + name + " => " + e.getmessage(); 

									   } 

									  } else { 

									   return "you failed to upload " + name + " because the file was empty."; 

									  } 

									 } 

									}

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 ：

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									import org.springframework.boot.springapplication; 

									import org.springframework.boot.autoconfigure.enableautoconfiguration; 

									import org.springframework.boot.context.embedded.multipartconfigfactory; 

									import org.springframework.context.annotation.bean; 

									import org.springframework.context.annotation.componentscan; 

									import org.springframework.context.annotation.configuration; 

									import javax.servlet.multipartconfigelement; 

									@configuration

									@componentscan

									@enableautoconfiguration

									public class application { 

									 @bean

									 public multipartconfigelement multipartconfigelement() { 

									  multipartconfigfactory factory = new multipartconfigfactory(); 

									  factory.setmaxfilesize("128kb"); 

									  factory.setmaxrequestsize("128kb"); 

									  return factory.createmultipartconfig(); 

									 } 

									 public static void main(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

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									<html> 

									<body> 

									<form method="post" enctype="multipart/form-data"

									  action="/batch/upload"> 

									 file to upload: <input type="file" name="file"><br /> 

									 file to upload: <input type="file" name="file"><br /> 

									 <input type="submit" value="upload"> press here to upload the file! 

									</form> 

									</body> 

									</html>

2. 新增batchfileuploadcontroller.java文件：

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									import org.springframework.stereotype.controller; 

									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.multipart.multipartfile; 

									import org.springframework.web.multipart.multiparthttpservletrequest; 

									import javax.servlet.http.httpservletrequest; 

									import java.io.bufferedoutputstream; 

									import java.io.file; 

									import java.io.fileoutputstream; 

									import java.util.list; 

									/** 

									 * created by wenchao.ren on 2014/4/26. 

									 */

									@controller

									public class batchfileuploadcontroller { 

									 @requestmapping(value="/batch/upload", method= requestmethod.post) 

									 public @responsebody

									 string handlefileupload(httpservletrequest request){ 

									  list<multipartfile> files = ((multiparthttpservletrequest)request).getfiles("file"); 

									  for (int i =0; i< files.size(); ++i) { 

									   multipartfile file = files.get(i); 

									   string name = file.getname(); 

									   if (!file.isempty()) { 

									    try { 

									     byte[] bytes = file.getbytes(); 

									     bufferedoutputstream stream = 

									       new bufferedoutputstream(new fileoutputstream(new file(name + i))); 

									     stream.write(bytes); 

									     stream.close(); 

									    } catch (exception e) { 

									     return "you failed to upload " + name + " => " + e.getmessage(); 

									    } 

									   } else { 

									    return "you failed to upload " + name + " because the file was empty."; 

									   } 

									  } 

									  return "upload successful"; 

									 } 

									}