700字范文 > SpringBoot实现文件上传接口

SpringBoot实现文件上传接口

时间：2021-05-30 10:00:32

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SpringBoot实现文件上传接口

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本文大约3845字，预计阅读时长10分钟

前言

文件上传是很多业务场景需要实现的功能，今天就简单以Springboot框架为基础实现文件上传的接口。

正文

代码

使用SpringBoot实现文件上传接口其实很简单。

1、首先定义一个文件上传的服务service及其实现类：

public interface FileService {public FileReturn uploadFile(MultipartFile multipartFile);}复制代码

@Servicepublic class FileServiceImpl implements FileService {private static final Logger logger = LoggerFactory.getLogger(FileServiceImpl.class);@Overridepublic FileReturn uploadFile(MultipartFile multipartFile) {// 文件保存路径String filePath = "F:\\filepath";// 文件名String fileName = String.valueOf(System.currentTimeMillis());File file = new File(filePath +File.separator + fileName);FileOutputStream fileOutputStream = null;try {fileOutputStream = new FileOutputStream(file);IOUtils.copy(multipartFile.getInputStream(),fileOutputStream);System.out.println("===========file upload success=======");} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}finally {try {//关闭fileOutputStream.close();} catch (IOException e) {e.printStackTrace();logger.error("文件关闭错误",e);}}return new FileReturn<>(1,"文件上传成功",file);}}复制代码

2、定义一个统一返回结果的实体类：

public class FileReturn<T> implements Serializable {private static final long serialVersionUID = -1959544190118740608L;private int resultCode;private String msg;private T data;public FileReturn() {}public FileReturn(int resultCode, String msg, T data) {this.resultCode = resultCode;this.msg = msg;this.data = data;}public int getResultCode() {return resultCode;}public void setResultCode(int resultCode) {this.resultCode = resultCode;}public String getMsg() {return msg;}public void setMsg(String msg) {this.msg = msg;}public T getData() {return data;}public void setData(T data) {this.data = data;}@Overridepublic String toString() {return "FileReturn{" +"resultCode=" + resultCode +", msg='" + msg + '\'' +", data=" + data +'}';}}复制代码

3、再定义一个工具类处理返回的结果：

public class ReturnValue<T> implements Serializable {private static final long serialVersionUID = -1959544190118740608L;private int ret;private String msg;private T data;public ReturnValue() {this.ret = 0;this.msg = "";this.data = null;}public ReturnValue(int retCode, String msg, T data) {this.ret = 0;this.msg = "";this.data = null;this.ret = retCode;this.data = data;this.msg = msg;}public ReturnValue(int retCode, String msg) {this.ret = 0;this.msg = "";this.data = null;this.ret = retCode;this.msg = msg;}public ReturnValue(ReturnCodeAndMsgEnum codeAndMsg) {this(codeAndMsg.getCode(), codeAndMsg.getMsg(), null);}public ReturnValue(ReturnCodeAndMsgEnum codeAndMsg, T data) {this(codeAndMsg.getCode(), codeAndMsg.getMsg(), data);}public int getRet() {return this.ret;}public void setRet(int ret) {this.ret = ret;}public String getMsg() {return this.msg;}public void setMsg(String msg) {this.msg = msg;}public T getData() {return this.data;}public void setData(T data) {this.data = data;}@Overridepublic String toString() {return "ReturnValue{" +"ret=" + ret +", msg='" + msg + '\'' +", data=" + data +'}';}}复制代码

4、最后就是实现一个Controller，处理文件上传的请求：

@RestController@RequestMapping(value="/file")public class FileController {@Autowiredprivate FileService fileService;@RequestMapping("/upload")public FileReturn uploadFile(@RequestParam("uploadFile") MultipartFile multipartFile){return fileService.uploadFile(multipartFile);}}复制代码

5、可以在application.yml中加入以下配置，限制大小：复制代码

spring:servlet:multipart:#单个文件最大限制类型是datasize，单位kbmax-file-size: 1024#单次请求最大限制max-request-size: 2048复制代码