11.Spring-Boot之文件上传

1.Application.java

package com.niugang;

import org.apache.catalina.connector.Connector;

import org.apache.coyote.http11.AbstractHttp11Protocol;

import org.mybatis.spring.annotation.MapperScan;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.context.embedded.tomcat.TomcatConnectorCustomizer;

import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;

import org.springframework.boot.web.support.SpringBootServletInitializer;

import org.springframework.context.annotation.Bean;

//解决包tomcat冲突

//@EnableAutoConfiguration(exclude={WebMvcAutoConfiguration.class})

//组件扫描,会自动扫描springboot启动类包及其子包下的注解文件

//@ComponentScan("com.niugang.controller")

//springboot注解

//springboot1.2+之后用@SpringBootApplication替代了三个注解

@SpringBootApplication

//mapper 接口类扫描包配置

@MapperScan(value={"com.niugang.dao"})

public class Application extends SpringBootServletInitializer{

public static void main(String[] args) {

SpringApplication.run(Application.class,args);

}

//Tomcat large file upload connection reset

@Bean

public TomcatEmbeddedServletContainerFactory tomcatEmbedded() {

TomcatEmbeddedServletContainerFactory tomcat = new TomcatEmbeddedServletContainerFactory();

tomcat.addConnectorCustomizers(new MyTomcatConnectorCustomizer());

return tomcat;

}

class MyTomcatConnectorCustomizer implements TomcatConnectorCustomizer{



@SuppressWarnings("rawtypes")

@Override

public void customize(Connector connector) {

AbstractHttp11Protocol protocolHandler = (AbstractHttp11Protocol)connector.getProtocolHandler();

protocolHandler.setMaxSwallowSize(-1);

}

}

}

上面代码事为了解决

tomcatEmbedded这段代码是为了解决上传文件大于10M出现连接重置的问题。此异常内容GlobalException也捕获不到

 ​

2.UploadController.java

package com.niugang.controller;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;

import org.springframework.ui.ModelMap;

import org.springframework.util.FileCopyUtils;

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

import org.springframework.web.multipart.MultipartFile;

/**

* 文件上传

*

* @author niugang

*

*/

@Controller

public class UploadController {



@RequestMapping("toupload")

public String toUpload() {

return "upload";

}



@RequestMapping("upload")

public String upload(MultipartFile file, ModelMap map, HttpServletRequest request) {

if (file.isEmpty()) {

map.put("uploadResult", "文件不能为空");

return "upload";

}

File filePath = new File("d:/myweb/upload");

if (!filePath.exists()) {

filePath.mkdirs();

}

File realPath = new File(filePath + "/" + file.getOriginalFilename());

try {

/*

* 或者这样

* File name = new File(file.getOriginalFilename());
*file.transferTo(name);

*/

FileCopyUtils.copy(file.getInputStream(), new FileOutputStream(realPath));

map.put("uploadResult", "文件上传成功");

} catch (IllegalStateException | IOException e) {



e.printStackTrace();

}



return "upload";

}




/**
*
* @return  第二种方式





* @throws IOException 

*/
@RequestMapping(value = "/upload1", method = RequestMethod.POST)
@ResponseBody
public String upload1(MultipartFile  file) throws IOException {
byte[] bytes = file.getBytes();
//这样默认上传文件就放在当前  项目路径下
File name = new File(file.getOriginalFilename());
FileCopyUtils.copy(bytes, name);
return name.getAbsolutePath();
}





}

3.application.properties

#文件上传相关配置

#org.springframework.boot.autoconfigure.web.MultipartProperties 具体配置类

#spring.http.multipart.enabled=true #默认支持文件上传.

#spring.http.multipart.file-size-threshold=0 #支持文件写入磁盘.

# 上传文件的临时目录

#spring.http.multipart.location=

# 最大支持文件大小

spring.http.multipart.max-file-size=2Mb #默认为1m

#spring.http.multipart.max-request-size=10Mb # 最大支持请求大小 默认为10m

4.FileUploadException.java 文件上传错误提示

package com.niugang.exception;

import org.springframework.boot.autoconfigure.web.MultipartProperties;

import org.springframework.boot.context.properties.ConfigurationProperties;

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

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

import org.springframework.web.multipart.MultipartException;

import org.springframework.web.servlet.ModelAndView;



/**

* @ControllerAdvice

* 它通常用于定义{@link ExceptionHandler @ExceptionHandler}、

* {@link InitBinder @InitBinder}和{@link ModelAttribute @ModelAttribute}

*

* 方法适用于所有{@link RequestMapping @RequestMapping}方法。

*

* @author niugang 文件上传异常处理类

*

*/



@ControllerAdvice

/**

* 从配置文件根据前缀读取设置 处理需要字段外还需要，set方法，否则值注入不进来

*

* @author niugang

*

*/

@ConfigurationProperties(prefix = "spring.http.multipart")

public class FileUploadException {

private String maxFileSize;



public String getMaxFileSize() {

return maxFileSize;

}



public void setMaxFileSize(String maxFileSize) {

this.maxFileSize = maxFileSize;

}



@ExceptionHandler(MultipartException.class)

public ModelAndView handleError1(MultipartException e) {



ModelAndView modelAndView = new ModelAndView("upload");

// 如果application.properties里面没有设置，则读取系统默认的文件大小

if (this.getMaxFileSize() == null) {

MultipartProperties multipartProperties = new MultipartProperties();

modelAndView.addObject("uploadResult", "最大上传为：" + multipartProperties.getMaxFileSize());

} else {

modelAndView.addObject("uploadResult", "最大上传为：" + this.getMaxFileSize());

}



return modelAndView;

}

}

5.upload.html

<!DOCTYPE html>

<html xmlns:th="http://www.thymeleaf.org">

<head>

<meta charset="UTF-8">

<title>Insert title here</title>



</head>

<body>

<h1>Spring Boot文件上传</h1>

<#if uploadResult??>

${uploadResult}

</#if>

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



<input type="file" name="file" /><br />

<br /> <input type="submit" value="提交" />

</form>

</body>

</html>

6.启动项目

http://localhost:8080/myweb/toupload

​

文件上传成功：

​

文件上传失败：

​

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