标签：and public ext code turn NPU 响应 download 教程
对于上载文件，要将MultipartFile用作请求参数，此API应使用多部分表单数据值。 观察下面给出的代码 -
@RequestMapping(value = "/upload", method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE) public String fileUpload(@RequestParam("file") MultipartFile file) { return null; }//原文出自【易百教程】，商业转载请联系作者获得授权，非商业请保留原文链接：https://www.yiibai.com/spring-boot/spring_boot_file_handling.html
package com.yiibai.demo.controller; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import org.springframework.http.MediaType; 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.RestController; import org.springframework.web.multipart.MultipartFile; @RestController public class FileUploadController { @RequestMapping(value = "/upload", method = RequestMethod.POST, consumes = MediaType.MULTIPART_FORM_DATA_VALUE) public String fileUpload(@RequestParam("file") MultipartFile file) throws IOException { File convertFile = new File("/var/tmp/"+file.getOriginalFilename()); convertFile.createNewFile(); FileOutputStream fout = new FileOutputStream(convertFile); fout.write(file.getBytes()); fout.close(); return "File is upload successfully"; } }//原文出自【易百教程】，商业转载请联系作者获得授权，非商业请保留原文链接：https://www.yiibai.com/spring-boot/spring_boot_file_handling.html
对于文件下载，应该使用InputStreamResource下载文件。需要在Response中设置HttpHeader Content-Disposition，并且需要指定应用程序的响应Media Type。
//原文出自【易百教程】，商业转载请联系作者获得授权，非商业转载请保留原文链接：https://www.yiibai.com/spring-boot/spring_boot_file_handling.html注 - 在以下示例中，文件应在运行应用程序的指定路径上可用。
@RequestMapping(value = "/download", method = RequestMethod.GET) public ResponseEntity<Object> downloadFile() throws IOException { String filename = "/var/tmp/mysql.png"; File file = new File(filename); InputStreamResource resource = new InputStreamResource(new FileInputStream(file)); HttpHeaders headers = new HttpHeaders(); headers.add("Content-Disposition", String.format("attachment; filename=\\"%s\\"", file.getName())); headers.add("Cache-Control", "no-cache, no-store, must-revalidate"); headers.add("Pragma", "no-cache"); headers.add("Expires", "0"); ResponseEntity<Object> responseEntity = ResponseEntity.ok().headers(headers).contentLength(file.length()).contentType( MediaType.parseMediaType("application/txt")).body(resource); return responseEntity; }//原文出自【易百教程】，商业转载请联系作者获得授权，非商业请保留原文链接：https://www.yiibai.com/spring-boot/spring_boot_file_handling.html
package com.yiibai.demo.controller; import java.io.File; import java.io.FileInputStream; import java.io.IOException; import org.springframework.core.io.InputStreamResource; import org.springframework.http.HttpHeaders; import org.springframework.http.MediaType; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; @RestController public class FileDownloadController { @RequestMapping(value = "/download", method = RequestMethod.GET) public ResponseEntity<Object> downloadFile() throws IOException { String filename = "/var/tmp/mysql.png"; File file = new File(filename); InputStreamResource resource = new InputStreamResource(new FileInputStream(file)); HttpHeaders headers = new HttpHeaders(); headers.add("Content-Disposition", String.format("attachment; filename=\\"%s\\"", file.getName())); headers.add("Cache-Control", "no-cache, no-store, must-revalidate"); headers.add("Pragma", "no-cache"); headers.add("Expires", "0"); ResponseEntity<Object> responseEntity = ResponseEntity.ok().headers(headers).contentLength( file.length()).contentType(MediaType.parseMediaType("application/txt")).body(resource); return responseEntity; } }//原文出自【易百教程】，商业转载请联系作者获得授权，非商业请保留原文链接：https://www.yiibai.com/spring-boot/spring_boot_file_handling.html
Maven构建文件 - pom.xml 的代码如下 -
<?xml version = "1.0" encoding = "UTF-8"?> <project xmlns = "http://maven.apache.org/POM/4.0.0" xmlns:xsi = "http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation = "http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.yiibai</groupId> <artifactId>demo</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>demo</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.8.RELEASE</version> <relativePath/> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>//原文出自【易百教程】，商业转载请联系作者获得授权，非商业请保留原文链接：https://www.yiibai.com/spring-boot/spring_boot_file_handling.html
标签：and public ext code turn NPU 响应 download 教程
原文地址：https://www.cnblogs.com/0710whh/p/12391111.html
