Java后端实现基本HttpRequest 上传文件

本文主要是介绍Java后端实现基本HttpRequest 上传文件，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1、使用场景

2、代码实现

2.1、引入pom.xml jar包

2.2、实现代码

3、成果展现

4、总结

1、使用场景

我们经常会在开发之中遇见要求上传文件，特别是后端接口开发过程之中。比如有一下场景：

(1)、我们每个人都需要上传头像

(2)、软件App或者PC端需要针对问题反馈需要上传两张反馈截图

(3)、还有相关论坛或者问题可能需要上传图片等操作。

以前我们项目之中主要都是通过 Ftp方式上传问题图片，使用封装的Java后端代码；但是我们可能实际开发之中可能就要求直接使用Http上传文件图片。并且我是遇到一个场景，我们原来业务系统使用的Ftp上传的文件；结果在部署服务器不开放对应端口；于是要求使用Http上传文件图片。最后因为工期比较紧张；此功能暂时屏蔽啦。于是本文在以前发生的亲身经历需要使用Http方式上传问题内容。

2、代码实现

2.1、引入pom.xml jar包

<dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.62</version>
</dependency>
<dependency><groupId>commons-fileupload</groupId><artifactId>commons-fileupload</artifactId><version>1.4</version>
</dependency>
<dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>1.7.28</version>
</dependency>

2.2、实现代码

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;import javax.imageio.ImageIO;
import javax.imageio.ImageReadParam;
import javax.imageio.ImageReader;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.io.*;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;/*** @Classname RequestGetFileInputStream* @Description 针对上传文件的相关操作 使用http request方式* @Date 2019/11/8 18:29* @Created by jianxiapc*/
public class UploadFileCommonUtil {private static Logger logger = LoggerFactory.getLogger(UploadFileCommonUtil.class);/*** 通过request之中获得file的Parts 实现文件的 上传* @param request* @param response* @param uploadFileDirPath* @param frontEndFileInputName* @param renameFileName* @throws IOException* @throws ServletException*/public static String uploadFileByPartsHttpServletRequest(HttpServletRequest request, HttpServletResponse response,String uploadFileDirPath, String frontEndFileInputName,String renameFileName) throws IOException, ServletException {logger.info("request.getContentType(): " + request.getContentType());if (!request.getContentType().split(";")[0].equals("multipart/form-data")){return null;}Collection<Part> parts = request.getParts();/**for(Part part:parts){System.out.println(part);String uploadFileDirPath="";}*/String uploadFileWholeDirPath="";for (Iterator<Part> iterator = parts.iterator(); iterator.hasNext(); ) {Part part = iterator.next();logger.info("-----类型名称------->" + part.getName());logger.info("-----类型------->" + part.getContentType());logger.info("-----提交的类型名称------->" + part.getSubmittedFileName());logger.info("----流-------->" + part.getInputStream());uploadFileWholeDirPath= uploadFileProcess(part, uploadFileDirPath, frontEndFileInputName,renameFileName);}return uploadFileWholeDirPath;}/*** 通过MultipartHttpServletRequest 实现文件的上传* @param request* @param response* @param uploadFileDirPath* @param frontEndFileInputName* @param renameFileName* @return* @throws IOException*/public static String uploadFileByMultipartHttpServletRequest(HttpServletRequest request, HttpServletResponse response,String uploadFileDirPath, String frontEndFileInputName,String renameFileName) throws IOException {//将当前上下文初始化给  CommonsMutipartResolver （多部分解析器）CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());String uploadFileWholeDirPath="";// 判断是否是多数据段提交格式if (multipartResolver.isMultipart(request)) {MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;Iterator<String> iter = multiRequest.getFileNames();logger.info("iter.hasNext(): " + iter.hasNext());Integer fileCount = 0;//文件流FileOutputStream fileOutputStream = null;while (iter.hasNext()) {MultipartFile  multipartFile = multiRequest.getFile(iter.next());String fileName = multipartFile.getOriginalFilename();logger.info("upload filename: " + fileName);if (fileName == null || fileName.trim().equals("")) {continue;}//20170207 针对IE环境下filename是整个文件路径的情况而做以下处理Integer index = fileName.lastIndexOf("\\");String ext = fileName.substring(fileName.lastIndexOf(".") + 1);String newStr = "";if (index > -1) {newStr = fileName.substring(index + 1);} else {newStr = fileName;}if (!newStr.equals("")) {fileName = newStr;}logger.info("new filename: " + fileName);if (multipartFile != null) {if(null!=renameFileName&&!"".equals(renameFileName)){uploadFileWholeDirPath=uploadFileDirPath+renameFileName+ext;}else{uploadFileWholeDirPath=uploadFileDirPath+fileName;}File storageFile = new File(uploadFileWholeDirPath);if(!storageFile.getParentFile().exists()){storageFile.getParentFile().mkdirs();}//获取输出流OutputStream os=new FileOutputStream(uploadFileWholeDirPath);//获取输入流 CommonsMultipartFile 中可以直接得到文件的流InputStream is=multipartFile.getInputStream();int temp;//一个一个字节的读取并写入while((temp=is.read())!=(-1)){os.write(temp);}os.flush();os.close();is.close();}}}return uploadFileWholeDirPath;}/*** 上传文件的处理函数* @param part* @param uploadFileDirPath* @param frontEndFileInputName* @param renameFileName 是否需要重新命名文件名称* @return* @throws IOException*/private static String uploadFileProcess(Part part, String uploadFileDirPath, String frontEndFileInputName,String renameFileName) throws IOException {String uploadFileWholeDirPath="";if (part.getName().equals(frontEndFileInputName)) {String cd = part.getHeader("Content-Disposition");String[] cds = cd.split(";");String filename = cds[2].substring(cds[2].indexOf("=") + 1).substring(cds[2].lastIndexOf("//") + 1).replace("\"", "");String ext = filename.substring(filename.lastIndexOf(".") + 1);logger.info("filename:" + filename);logger.info("ext:" + ext);InputStream is = part.getInputStream();if (Arrays.binarySearch(ImageIO.getReaderFormatNames(), ext) >= 0)uploadImageProcess(uploadFileDirPath, filename, ext, is);else {uploadCommonFileProcess(uploadFileDirPath, filename, is);}if(null!=renameFileName&&!"".equals(renameFileName)){uploadFileWholeDirPath=uploadFileDirPath+renameFileName+ext;}else{uploadFileWholeDirPath=uploadFileDirPath+filename;}}return uploadFileWholeDirPath;}/*** 通用文件上传处理** @param uploadFileDirPath* @param filename* @param is*/private static void uploadCommonFileProcess(String uploadFileDirPath, String filename, InputStream is) {FileOutputStream fos = null;try {fos = new FileOutputStream(new File(uploadFileDirPath + filename));int b = 0;while ((b = is.read()) != -1) {fos.write(b);}} catch (Exception e) {e.printStackTrace();} finally {try {fos.close();} catch (Exception e) {e.printStackTrace();}}}/*** 图片文件上传处理** @param uploadFileDirPath* @param filename* @param ext* @param is* @throws IOException*/public static void uploadImageProcess(String uploadFileDirPath, String filename, String ext, InputStream is) throws IOException {Iterator<ImageReader> irs = ImageIO.getImageReadersByFormatName(ext);ImageReader ir = irs.hasNext() ? irs.next() : null;if (ir == null)return;//必须转换为ImageInputStream，否则异常ir.setInput(ImageIO.createImageInputStream(is));ImageReadParam rp = ir.getDefaultReadParam();Rectangle rect = new Rectangle(0, 0, 200, 200);rp.setSourceRegion(rect);//allowSearch必须为true，否则有些图片格式imageNum为-1。int imageNum = ir.getNumImages(true);logger.info("imageNum:" + imageNum);for (int imageIndex = 0; imageIndex < imageNum; imageIndex++) {BufferedImage bi = ir.read(imageIndex, rp);ImageIO.write(bi, ext, new File(uploadFileDirPath + filename));}}
}

import org.spring.springboot.excel.poi.export.utils.annotation.FileStorageProperties;
import org.spring.springboot.excel.poi.export.utils.common.UploadFileCommonUtil;
import org.springframework.beans.factory.annotation.Autowired;
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;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*** @Classname UploadFileController* @Description 基本的文件上传实现测试* @Date 2019/11/9 11:42* @Created by jianxiapc*/
@RestController
public class UploadFileController {@Autowiredprivate FileStorageProperties fileStorageProperties;@RequestMapping(value = "/uploadFile", method = RequestMethod.POST)public String uploadFile(HttpServletRequest request, HttpServletResponse response, @RequestParam("importExelFile") MultipartFile file) throws Exception {String uploadFileDirPath =fileStorageProperties.getUploadDir();//String storageFilePath=UploadFileCommonUtil.uploadFileByPartsHttpServletRequest(request,response,uploadFileDirPath,"importExelFile",null);String storageFilePath=UploadFileCommonUtil.uploadFileByMultipartHttpServletRequest(request,response,uploadFileDirPath,"importExelFile",null);return storageFilePath;}
}