本文實例為大家分享了spring boot實現文件上傳的具體代碼，供大家參考，具體內容如下
1. 創建一個maven的web工程，然后配置pom.xml文件，增加依賴：
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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目錄下的index.jsp文件中輸入一個表單：
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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> |
這個表單就是我們模擬的上傳頁面
3. 編寫處理這個表單的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. 然后我們對上傳的文件做一些限制，同時編寫main方法來啟動這個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. 然后訪問http://localhost:8080/upload就可以看到頁面了。
上面的例子是實現的是單個文件上傳的功能，假定我們現在要實現文件批量上傳的功能的話，我們只需要簡單的修改一下上面的代碼就行，考慮到篇幅的問題，下面只是貼出和上面不同的代碼，沒有貼出的說明和上面一樣。：
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"; } } |
這樣一個簡單的批量上傳文件的功能就ok了，是不是很簡單啊。
注意：上面的代碼只是為了演示而已，所以編碼風格上采取了隨性的方式，不建議大家模仿。
參考資料：multipartresolver實現文件上傳功能
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
1. multipartresolver也可以實現文件上傳功能。參考文章：原文鏈接：https://blog.csdn.net/woshizhangliang999/article/details/46711747
