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Spring Boot : 文件上传(八)

2017-08-25 11:47 381 查看

文件上传

添加pom.xml包支持

<!-- thymeleaf支持 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>

页面:

fileupload.html

<!DOCTYPE html>
<html>
<head>
<title>文件上传示例</title>
</head>
<body>
<h2>文件上传示例</h2>
<hr/>
<form method="POST" enctype="multipart/form-data" action="/upload">
<p>
文件：<input type="file" name="file" />
</p>
<p>
<input type="submit" value="上传" />
</p>
</form>
</body>
</html>

mutifileupload.html

<!DOCTYPE html>
<html>
<head>
<title>批量文件上传示例</title>
</head>
<body>
<h2>批量文件上传示例</h2>
<hr/>
<form method="POST" enctype="multipart/form-data"
action="/upload/batch">
<p>
文件1：<input type="file" name="file" />
</p>
<p>
文件2：<input type="file" name="file" />
</p>
<p>
文件3：<input type="file" name="file" />
</p>
<p>
<input type="submit" value="上传" />
</p>
</form>
</body>
</html>

FileUploadController.java

package cn.milo.controllor;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.List;

import javax.servlet.http.HttpServletRequest;

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;
import org.springframework.web.multipart.MultipartHttpServletRequest;

/**
* Created by admin on 2017/8/25.
* 代码摘自 :http://blog.csdn.net/catoop/article/details/61415169
*/
@Controller
public class FileUploadController {

// 访问路径为：http://ip:port/upload
@RequestMapping(value = "/upload", method = RequestMethod.GET)
public String upload() {
return "/fileupload";
}

// 访问路径为：http://ip:port/upload/batch
@RequestMapping(value = "/upload/batch", method = RequestMethod.GET)
public String batchUpload() {
return "/mutifileupload";
}

/**
* 单文件
*/
@RequestMapping(value = "/upload", method = RequestMethod.POST)
@ResponseBody
public String upload(@RequestParam("file") MultipartFile file) {
if (!file.isEmpty()) {
try {
// 这里只是简单例子，文件直接输出到项目路径下。
// 实际项目中，文件需要输出到指定位置，需要在增加代码处理。
// 还有关于文件格式限制、文件大小限制，详见：中配置。
BufferedOutputStream out = new BufferedOutputStream(
new FileOutputStream(new File(file.getOriginalFilename())));
out.write(file.getBytes());
out.flush();
out.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
return "上传失败," + e.getMessage();
} catch (IOException e) {
e.printStackTrace();
return "上传失败," + e.getMessage();
}
return "上传成功";
} else {
return "上传失败，因为文件是空的.";
}
}

/**
* 多文件
*/
@RequestMapping(value = "/upload/batch", method = RequestMethod.POST)
public @ResponseBody String batchUpload(HttpServletRequest request) {
List<MultipartFile> files = ((MultipartHttpServletRequest) request).getFiles("file");
MultipartFile file = null;
BufferedOutputStream stream = null;
for (int i = 0; i < files.size(); ++i) {
file = files.get(i);
if (!file.isEmpty()) {
try {
byte[] bytes = file.getBytes();
stream = new BufferedOutputStream(new FileOutputStream(new File(file.getOriginalFilename())));
stream.write(bytes);
stream.close();
} catch (Exception e) {
stream = null;
return "You failed to upload " + i + " => " + e.getMessage();
}
} else {
return "You failed to upload " + i + " because the file was empty.";
}
}
return "upload successful";
}
}

文件大小设置

方式一:

FileUploadConfiguration.java

package cn.milo.controllor;

import javax.servlet.MultipartConfigElement;

import org.springframework.boot.web.servlet.MultipartConfigFactory;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
public class FileUploadConfiguration {

@Bean
public MultipartConfigElement multipartConfigElement() {
MultipartConfigFactory factory = new MultipartConfigFactory();
// 设置文件大小限制 ,超出设置页面会抛出异常信息，
// 这样在文件上传的地方就需要进行异常信息的处理了;
factory.setMaxFileSize("1000KB"); // KB,MB
/// 设置总上传数据总大小
factory.setMaxRequestSize("2000KB");
// Sets the directory location where files will be stored.
// factory.setLocation("路径地址");
return factory.createMultipartConfig();
}
}

一般放在启动类:

@Configuration
@SpringBootApplication
public class Application {

public static void main(String[] args) throws Exception {
SpringApplication.run(Application.class, args);
}

/**
* 文件上传配置
* @return
*/
@Bean
public MultipartConfigElement multipartConfigElement() {
MultipartConfigFactory factory = new MultipartConfigFactory();
//文件最大
factory.setMaxFileSize("1000KB"); //KB,MB
/// 设置总上传数据总大小
factory.setMaxRequestSize("2000KB");
return factory.createMultipartConfig();
}

}

方式二:在application.yml中添加配置

spring:
http:
multipart:
maxFileSize: 1000KB
maxRequestSize : 2000KB

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标签： springboot

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章节导航

Spring Boot : 文件上传(八)

目录

文件上传

文件大小设置