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Java 文件上传

来源：博客园


(资料图片)

一：配置springBoot上传文件限制

spring:  servlet:    multipart:      max-file-size: 100MB  #单个文件大小      max-request-size: 1024MB #总文件大小

二：代码

import org.springframework.web.bind.annotation.*;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.multipart.support.StandardMultipartHttpServletRequest;import javax.servlet.http.HttpServletRequest;import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.util.Base64;import java.util.Locale;import java.util.UUID;@RestController@RequestMapping("upload")public class UploadController {    /**     * 上传方式一，从请求体中获取文件信息     * @param request     * @return     * @throws IOException     */    @PostMapping("method1")    public String upload1(HttpServletRequest request) throws IOException {        MultipartFile file = ((StandardMultipartHttpServletRequest) request).getFile("file");        String fileName = file.getOriginalFilename();        String newName=UUID.randomUUID().toString()+fileName.substring(fileName.indexOf("."));        // 获取当前操作系统        String osName = System.getProperties().get("os.name").toString().toLowerCase(Locale.ROOT);        String path="";        if(osName.startsWith("win")){            path="D:\\Test\\";        }else{            path="/mnt/test";        }        File saveFile=new File(path+newName);        if(!saveFile.getParentFile().exists()){            saveFile.getParentFile().mkdirs();        }        file.transferTo(saveFile);        return saveFile.getPath();    }    /**     * 上传方式2 MultipartFile 上传     * @param file     * @return     * @throws IOException     */    @PostMapping("method2")    public String upload2(@RequestParam("file") MultipartFile file) throws IOException {        String fileName = file.getOriginalFilename();        String newName=UUID.randomUUID().toString()+fileName.substring(fileName.indexOf("."));        // 获取当前操作系统        String osName = System.getProperties().get("os.name").toString().toLowerCase(Locale.ROOT);        String path="";        if(osName.startsWith("win")){            path="D:\\Test\\";        }else{            path="/mnt/test";        }        File saveFile=new File(path+newName);        if(!saveFile.getParentFile().exists()){            saveFile.getParentFile().mkdirs();        }        file.transferTo(saveFile);        return saveFile.getPath();    }    /**     * base64 图片上传     * @param base64     * @return     */    @PostMapping("method3")    public String upload3(@RequestParam("base64")String base64){        String base64Data = base64.split(",")[1];        Base64.Decoder decoder = Base64.getDecoder();        byte[] bytes = decoder.decode(base64Data);        // 获取当前操作系统        String osName = System.getProperties().get("os.name").toString().toLowerCase(Locale.ROOT);        String path="";        if(osName.startsWith("win")){            path="D:\\Test\\";        }else{            path="/mnt/test";        }        String newName=UUID.randomUUID().toString()+".png";        File saveFile=new File(path+newName);        if(!saveFile.getParentFile().exists()){            saveFile.getParentFile().mkdirs();        }        FileOutputStream fos = null;        try {            fos = new FileOutputStream(saveFile);            fos.write(bytes);        } catch (IOException e) {            e.printStackTrace();        } finally {            if (fos != null) {                try {                    fos.close();                } catch (IOException e) {                    e.printStackTrace();                }            }        }        return saveFile.getPath();    }    public static void main(String[] args) {        String data = "data:image/png;base64,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";    }}

通过文件地址上传文件

1、webUtil工具类下载图片如下

public static void downloadImgByNet(String ServerfilePath,String filePath,String fileName){        try{            URL url = new URL(ServerfilePath);            URLConnection conn = url.openConnection();            //设置超时间为3秒            conn.setConnectTimeout(3*1000);            //防止屏蔽程序抓取而返回403错误            conn.setRequestProperty("User-Agent", "Mozilla/4.0 (compatible; MSIE 5.0; Windows NT; DigExt)");            //输出流            InputStream str = conn.getInputStream();            //控制流的大小为1k            byte[] bs = new byte[1024];            //读取到的长度            int len = 0;            //是否需要创建文件夹            File saveDir = new File(filePath);            if(!saveDir.exists()){                saveDir.mkdir();            }            File file = new File(saveDir+ File.separator+fileName);            //实例输出一个对象            FileOutputStream out = new FileOutputStream(file);            //循环判断，如果读取的个数b为空了，则is.read()方法返回-1，具体请参考InputStream的read();            while ((len = str.read(bs)) != -1) {                //将对象写入到对应的文件中                out.write(bs, 0, len);            }            //刷新流            out.flush();            //关闭流            out.close();            str.close();            System.out.println("下载成功");        }catch (Exception e) {            e.printStackTrace();        }    }

2、上传图片接口

@Value("${uploadfile.fileLoadPath}")    String fileLoadPath="E:\\test";    @RequestMapping(method = RequestMethod.POST, value = "/fileUpload")    public void ChangeState(@RequestBody Map param, HttpServletRequest request,                            HttpServletResponse response){        String UploadfilePath="";        if (param.get("UploadfilePath")!=null){            UploadfilePath=param.get("UploadfilePath").toString();        }        String fileName="";        if (param.get("fileName")!=null){            fileName=param.get("fileName").toString();        }        WebUtil.downloadImgByNet(UploadfilePath,fileLoadPath,fileName);    }

通过文件传入并存放服务器

@Value("${uploadfile.fileLoadPath}")    String fileLoadPath="E:\\test";    /**     * 文件的上传     * @param file     * @return     */    @RequestMapping(value = "/uploads",method = RequestMethod.POST)    public void upload(@RequestParam("file") MultipartFile file, HttpServletResponse response) {        // 判断文件是否为空        String path = fileLoadPath;        HashMap message = new HashMap<>();        if (!file.isEmpty()) {            try {                // 文件保存路径                String filePath = path + "/" + file.getOriginalFilename();                if (!new File(filePath).exists()){                    new File(filePath).mkdirs();                }                // 转存文件                file.transferTo(new File(filePath));                message.put("status", filePath);            } catch (Exception e) {//                e.printStackTrace();                message.put("status", "error");            }        }        renderResult(response, message);    }

上传并生成随即名

@Value("${uploadfile.fileLoadPath}")    String fileLoadPath="E:\\test";    /**     * 文件的上传     * @param file     * @return     */    @RequestMapping(value = "/upload",method = RequestMethod.POST)    public void upload(@RequestParam("file") MultipartFile file, HttpServletResponse response) {        // 判断文件是否为空        String path = fileLoadPath;        HashMap message = new HashMap<>();        if (!file.isEmpty()) {            try {                // 文件保存路径//                String filePath = path + "/" + file.getOriginalFilename();                String suffixName = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));      //获取文件的后缀名                String filePath = path+"\\"+UUID.randomUUID().toString().replace("-","")+suffixName;        //拼接                if (!new File(filePath).exists()){                    new File(filePath).mkdirs();                }                // 转存文件                file.transferTo(new File(filePath));                message.put("status", filePath);            } catch (Exception e) {//                e.printStackTrace();                message.put("status", "error");            }        }        renderResult(response, message);    }

以base64编码上传文件

以下为base64的编码和解码的工具类

public class FileBase64Utils {    /**     * 本地文件（图片、excel等）转换成Base64字符串     *     * @param file      接受的文件     */    public static String convertFileToBase64(MultipartFile file) {        byte[] data = null;        // 读取图片字节数组        try {            InputStream in = file.getInputStream();//            InputStream in = new FileInputStream(imgPath);            System.out.println("文件大小（字节）=" + in.available());            data = new byte[in.available()];            in.read(data);            in.close();        } catch (IOException e) {            e.printStackTrace();        }        // 对字节数组进行Base64编码，得到Base64编码的字符串        Base64.Decoder decoder = Base64.getDecoder();        Base64.Encoder encoder = Base64.getEncoder();        String base64Str = encoder.encodeToString(data);        return base64Str;    }    /**     * 将base64字符串，生成文件     */    public static File convertBase64ToFile(String fileBase64String, String filePath, String fileName) {        BufferedOutputStream bos = null;        FileOutputStream fos = null;        File file = null;        try {            File dir = new File(filePath);            if (!dir.exists() && dir.isDirectory()) {//判断文件目录是否存在                dir.mkdirs();            }            Base64.Decoder decoder = Base64.getDecoder();            Base64.Encoder encoder = Base64.getEncoder();//            BASE64Decoder decoder = new BASE64Decoder();            byte[] bfile = decoder.decode(fileBase64String);            file = new File(filePath + File.separator + fileName);            fos = new FileOutputStream(file);            bos = new BufferedOutputStream(fos);            bos.write(bfile);            return file;        } catch (Exception e) {            e.printStackTrace();            return null;        } finally {            if (bos != null) {                try {                    bos.close();                } catch (IOException e1) {                    e1.printStackTrace();                }            }            if (fos != null) {                try {                    fos.close();                } catch (IOException e1) {                    e1.printStackTrace();                }            }        }    }}

上传附件的接口如下

/**     * 附件上传接口     * @param request     * @param response     * @param file      前端传来的附件     */    @RequestMapping(method = RequestMethod.POST, value = "/uploadFile")    public void uploadFile(HttpServletRequest request,                           HttpServletResponse response,  MultipartFile file){        Map res = new HashMap();        try{            long start = System.currentTimeMillis();        //获取开始的时间            String filename = file.getOriginalFilename();       //获取文件名            String imgBase64Str = FileBase64Utils.convertFileToBase64(file);   //使用base64对文件编码成字符串格式            System.out.println("Base64字符串length=" + imgBase64Str.length());     //得到编码后的长度//            如果文件不存在，则创建            if (!new File(ServerloadPath).exists()){                new File(ServerloadPath).mkdirs();            }//            重新将字符串解码为文件类型并上传            File file1 = FileBase64Utils.convertBase64ToFile(imgBase64Str, ServerloadPath, filename);            assert file1 != null;            String absolutePath = file1.getAbsolutePath();//            输入花费时间            System.out.println("duration:" + (System.currentTimeMillis() - start));//            返回存放地址            res.put("filePath", absolutePath);            res.put("duration",System.currentTimeMillis() - start+"ms");            renderResult(response, res);        }catch(Exception ex){            ex.printStackTrace();        }    }

关键词： 文件大小 上传文件 操作系统