Java 文件上传

Posted 2020-10-23 PinBo

1.pom.xml百度

2.核心:

2.1实体类 FileUploadDataBucket:

package com.dzpykj.files;

import java.io.File;

/**
 * 上传文件暂存数据的桶
 * @author ChaiXY
 */
public class FileUploadDataBucket {
    /**即将要保存的文件*/
    public File desFile;
    /**源文件*/
    public File srcFile;
    /**源文件名(带后缀)*/
    public String srcFileName;
    /**储存文件的名称(带后缀)*/
    public String desFileName;
    /**文件类型*/
    public String suffixName;
    /**基础路径*/
    public String basePath;
    /**针对不同功能存放文件可能有不同的文件夹,或者同一模块不同文件类型要存在不同的文件夹,都会在基础路径下新建文件夹,此字段用于存放基础路径后的各自的路径*/
    public String ownPath;
    /**数据存储的存放路径*/
    public String dbFilePath;
    /**文件大小*/
    public String fileSize;
    /**文件md5*/
    public String contentMD5;
    
    
    public File getDesFile() {
        return desFile;
    }
    public void setDesFile(File desFile) {
        this.desFile = desFile;
    }
    public File getSrcFile() {
        return srcFile;
    }
    public void setSrcFile(File srcFile) {
        this.srcFile = srcFile;
    }
    public String getSrcFileName() {
        return srcFileName;
    }
    public void setSrcFileName(String srcFileName) {
        this.srcFileName = srcFileName;
    }
    public String getDesFileName() {
        return desFileName;
    }
    public void setDesFileName(String desFileName) {
        this.desFileName = desFileName;
    }
    public String getSuffixName() {
        return suffixName;
    }
    public void setSuffixName(String suffixName) {
        this.suffixName = suffixName;
    }
    public String getBasePath() {
        return basePath;
    }
    public void setBasePath(String basePath) {
        this.basePath = basePath;
    }
    public String getOwnPath() {
        return ownPath;
    }
    public void setOwnPath(String ownPath) {
        this.ownPath = ownPath;
    }
    public String getDbFilePath() {
        return dbFilePath;
    }
    public void setDbFilePath(String dbFilePath) {
        this.dbFilePath = dbFilePath;
    }
    public String getFileSize() {
        return fileSize;
    }
    public void setFileSize(String fileSize) {
        this.fileSize = fileSize;
    }
    public String getContentMD5() {
        return contentMD5;
    }
    public void setContentMD5(String contentMD5) {
        this.contentMD5 = contentMD5;
    }
    
}

 

2.2上传文件工具类FileUploadUtils:

package com.dzpykj.files;

import java.io.File;
import java.io.IOException;
import java.math.BigDecimal;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.Iterator;
import java.util.List;
import java.util.Random;

import javax.servlet.http.HttpServletRequest;

import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

/**
 * 文件上传
 * @author ChaiXY
 */
public class FileUploadUtils {
    
    /**
     * 上传文件,并且回传数据桶(存储要保存到数据库的数据)
     * @param request 
     * @param basePath 基础路径(前后不要携带分隔符,工具类会自动补全)
     * @param ownPath 针对不同功能存放文件可能有不同的文件夹,或者同一模块不同文件类型要存在不同的文件夹,都会在基础路径下新建文件夹,此字段用于存放基础路径后的各自的路径(前后不要携带分隔符,工具类会自动补全)
     * @return 数据桶
     */
    public static List<FileUploadDataBucket> uploadFiles(HttpServletRequest request, String basePath, String ownPath) throws IOException {
        // 创建一个通用的多部分解析器
        CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
        List<FileUploadDataBucket> dataBuckets = new ArrayList<>();
        // 判断 request 是否有文件上传,即多部分请求
        if (multipartResolver.isMultipart(request)) {
            // 转换成多部分request
            MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
            // 取得request中的所有文件名
            Iterator<String> iter = multiRequest.getFileNames();
            while (iter.hasNext()) {
                List<MultipartFile> multipartFiles = multiRequest.getFiles(iter.next());
                
                for(MultipartFile multipartFile:multipartFiles){
                    String srcFileName = multipartFile.getOriginalFilename();// 原名称 带后缀
                    String suffixName = srcFileName.substring(srcFileName.lastIndexOf(".") + 1);// 文件类型
                    String contentMD5 = DigestUtils.md5Hex(multipartFile.getBytes());
                    double size = (multipartFile.getSize() * 1.0) / (1024 * 1.0) / (1024 * 1.0);
                    BigDecimal bg = new BigDecimal(size);
                    double f1 = bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue();
                    String fileSize = f1 + "";
                    
                    String desFileName = generateFileName() + "." + suffixName;
                    String dbFilePath = ownPath + File.separator + desFileName;
                    String desFilePath = basePath + File.separator + dbFilePath;
                    
                    File desFile = new File(desFilePath);
                    if (!desFile.exists()) {
                        desFile.mkdirs();
                    }
                    
                    if (StringUtils.isNotBlank(srcFileName)) {
                        multipartFile.transferTo(desFile);
                        FileUploadDataBucket fudb = new FileUploadDataBucket();
                        fudb.setBasePath(basePath);
                        fudb.setContentMD5(contentMD5);
                        fudb.setDbFilePath(dbFilePath);
                        fudb.setDesFile(desFile);
                        fudb.setDesFileName(desFileName);
                        fudb.setFileSize(fileSize);
                        fudb.setOwnPath(ownPath);
                        fudb.setSrcFileName(srcFileName);
                        fudb.setSuffixName(suffixName);
                        dataBuckets.add(fudb);
                    }
                }
            }
        }
        return dataBuckets;
    }
    
    private static String generateFileName(){
        String dateStr = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
        long timeMillis = System.currentTimeMillis();
        int random = new Random().nextInt(90)+10;
        return dateStr+timeMillis+random;
    }
}

 

 

2.3配置文件

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="maxUploadSize">
            <value>104857600</value>
        </property>
        <property name="maxInMemorySize">
            <value>4096</value>
        </property>
        <property name="defaultEncoding">
            <value>utf-8</value>
        </property>
        <!-- <property name="defaultEncoding" value="UTF-8" /> -->
    </bean>

 

 

 3.简单的测试

3.1Controller层FileUploadTestController:

package com.dzpykj.files.upload;

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.ResponseBody;

import com.dzpykj.files.FileUploadDataBucket;
import com.dzpykj.files.FileUploadUtils;
import com.fasterxml.jackson.databind.ObjectMapper;

@Controller
public class FileUploadTestController {
    
    @RequestMapping("/fileUpload")
    @ResponseBody
    public String upload(HttpServletRequest req) throws IOException{
        List<FileUploadDataBucket> dataBuckets = FileUploadUtils.uploadFiles(req,"E:\\fiels","pic");
        String jsonStr = new ObjectMapper().writeValueAsString(dataBuckets).toString();
        System.out.println(jsonStr);
        return jsonStr;
    }
    
}

 

 

3.2简单jsp页面 fileUpload.jsp:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
    <form action="/fileUpload" method="post" enctype="multipart/form-data">
        <input type="file" name="fiel1" /> 
        <br>
        <input type="file" name="fiel2" />
        <br>
        <input type="submit" value="上传文件" />
    </form>
</body>
</html>