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; @controllerpublic 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@enableautoconfigurationpublic 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. */ @controllerpublic 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"; } } |
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。
注意：上面的代码只是为了演示而已，所以编码风格上采取了随性的方式，不建议大家模仿。
参考资料：multipartresolver实现文件上传功能
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。
1. multipartresolver也可以实现文件上传功能。参考文章：原文链接：https://blog.csdn.net/woshizhangliang999/article/details/46711747
