文件的批量上传

　　本次使用的Spring的文件批量上传,前台使用ajax方式,并显示进度条.

　　导包

<!-- 文件上传下载包 -->
<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.1</version>
</dependency>
<!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.4</version>
</dependency>

　　页面代码

<%@ 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">
    <!-- <script src="https://cdn.bootcss.com/jquery/1.10.2/jquery.min.js"></script> -->
    <!-- 引入全局 stylesheet 和 script -->
    <jsp:include page="${contextPath}/views/common/script.jsp"/>
    <jsp:include page="${contextPath}/views/common/stylesheet.jsp"/>
    <title>Insert title here</title>
</head>
<body>

<div class="progress" style="display: none;">
    <div class="progress-bar" role="progressbar" aria-valuenow="60"
         aria-valuemin="0" aria-valuemax="100" style=" 0;">
        <span id="checkProgress"></span>
    </div>
</div>

<form id="uploadForm" enctype="multipart/form-data">
    用户名：<input type="text" name="user"/><br/>
    文件1：<input type="file" name="file"/><br/>
    文件2：<input type="file" name="file02"/><br/>
</form>
<button id="upload">上传文件</button>



<form enctype="multipart/form-data" method="post" action="file/upload.action">
    文件3：<input type="file" name="file" multiple="multiple" /><br/>
  
    <input type="submit" value="提交">
</form>

</body>

<script type="text/javascript">
    $(function () {
        var pro;
        $("#upload").click(function () {
            //显示样式
            $(".progress").show();
            pro = setInterval(progress,1000);
            var formData = new FormData($('#uploadForm')[0]);
            formData.append("param","bbbbbbbbbbb");
            $.ajax({
                type: 'post',
                url: "file/upload.action",
                data: formData,
                cache: false,
                processData: false,
                contentType: false,
            }).success(function (data) {
                alert(data);
            }).error(function () {
                clearInterval(pro);
                $(".progress").css("display","none");
                alert("上传失败");
            });
           
        });
        function progress () {
            $.ajax({
                type: 'post',
                url: "file/getProgress.action",
                data: {},
                cache: false,
                processData: false,
                contentType: "application/json",
            }).success(function (data) {
                if(typeof (data.percent) != "undefind" && data.percent != null){
                   var per = data.percent +'%';
                    $(".progress-bar").css("width",per);
                    $("#checkProgress").html(per);
                    if(per == "100%"){
                        clearInterval(pro);
                        $(".progress").hide();
                    }
                }
                console.log(data);
            }).error(function () {
                alert("上传失败");
            });
        }

    });
</script>

</html>

　　控制层代码

/**
     * 文件的上传
     * @param request
     * @return
     */
    @RequestMapping(value="/upload",method = RequestMethod.POST)
    @ResponseBody
    public Object upload(HttpServletRequest request){
    	//获取数据测试
    	String user = request.getParameter("user");
    	String param = request.getParameter("param");
        String contextPath = request.getSession().getServletContext().getRealPath("/data");
        String path = contextPath+"/diagrams";
        Object[] fileLastName = {".zip",".doc",".docx",".txt",".iso"};
        //创建一个通用的多部分解析器
        CustomMultipartResolver multipartResolver = new CustomMultipartResolver(request.getSession().getServletContext());
        multipartResolver.setDefaultEncoding("utf-8");
        //判断是否有文件上传
        if(multipartResolver.isMultipart(request)){
            //转化成request
            MultipartHttpServletRequest multipartRequest =(MultipartHttpServletRequest)(request);
            //取得request中的所有文件
            Map<String, MultipartFile> fileMap = multipartRequest.getFileMap();
            Collection<MultipartFile> files = fileMap.values();
            int size = files.size();//文件的数量
            if(size > 6){
                return "上传数量不得大于6个";
            }
            if(size == 0) {
            	return "没有文件或者刷新页面重新上传";
            }
            //遍历上传文件
            for (MultipartFile file:files) {
                long startMillis = System.currentTimeMillis();//文件上传的开始时间
                if(file != null){
                    String name = file.getName();//获取jsp页面中name中的值
                    String fileName = file.getOriginalFilename();//获得上传文件的名称
                    if(StringUtils.isBlank(fileName)){
                        continue;
                    }
                    int lastNum = fileName.lastIndexOf(".");
                    String suffix = fileName.substring(lastNum, fileName.length());//判断文件的结尾
                    //判断后缀名是否符合标准
                    boolean contains = ArrayUtils.contains(fileLastName,suffix);
                    if(!contains){
                        return "后缀名不合法";
                    }
                }
                try {
                    String filePath = path+file.getOriginalFilename()+new Date().getTime();
                    file.transferTo(new File(filePath));
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return "上传成功";
    }


 @RequestMapping(value = "/getProgress",method = RequestMethod.POST)
    @ResponseBody
    public ProgressEntity initCreateInfo(HttpServletRequest request) {
        ProgressEntity status =  (ProgressEntity) request.getSession().getAttribute("status");
        if(status==null){
            return new ProgressEntity();
        }
        return status;
    }

　　Spring整合

 <!-- SpringMVC上传文件时，需要配置MultipartResolver处理器 -->
    <bean id="multipartResolver" class="ch.system.rebean.CustomMultipartResolver">
       <!-- <property name="maxUploadSize" value="3"/>
        <property name="maxInMemorySize" value="4096"/>-->
        <property name="defaultEncoding" value="UTF-8"></property>
    </bean>

　　文件上传的重写

package ch.system.rebean;

import ch.system.listener.MyProgressListener;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUpload;
import org.apache.commons.fileupload.FileUploadBase;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.multipart.MaxUploadSizeExceededException;
import org.springframework.web.multipart.MultipartException;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import java.util.List;

/**
 * Description:对上传文件的重写
 *
 * @author cy
 * @date 2018年08月06日 18:05
 * version 1.0
 */
public class CustomMultipartResolver extends CommonsMultipartResolver {

    @Autowired
    private MyProgressListener progressListener;

    public CustomMultipartResolver() {
    }

    public CustomMultipartResolver(ServletContext servletContext) {
        super(servletContext);
    }

    
    public void setFileUploadProgressListener(MyProgressListener progressListener){
        this.progressListener=progressListener;
    }

    @Override
    public MultipartParsingResult parseRequest(HttpServletRequest request)
            throws MultipartException {
        String encoding = determineEncoding(request);
        FileUpload fileUpload = prepareFileUpload(encoding);
        progressListener.setSession(request.getSession());
        fileUpload.setProgressListener(progressListener);
        try {
            List<FileItem> fileItems = ((ServletFileUpload) fileUpload).parseRequest(request);
            return parseFileItems(fileItems, encoding);
        }
        catch (FileUploadBase.SizeLimitExceededException ex) {
            throw new MaxUploadSizeExceededException(fileUpload.getSizeMax(), ex);
        }
        catch (FileUploadException ex) {
            throw new MultipartException("Could not parse multipart servlet request", ex);
        }
    }


}

　　进度条bean

package ch.system.bean;

/**
 * Description:文件下载读取文件的bean
 *
 * @author cy
 * @date 2018年08月06日 18:10
 * version 1.0
 */
public class ProgressEntity {
    private long pBytesRead = 0L;   //到目前为止读取文件的比特数
    private long pContentLength = 0L;    //文件总大小
    private int pItems;                //目前正在读取第几个文件
    private int percent; // 完成比例
    private long startTime = System.currentTimeMillis(); //开始时间
    private long useTime = System.currentTimeMillis(); //已用时间
    

    public long getpBytesRead() {
        return pBytesRead;
    }
    public void setpBytesRead(long pBytesRead) {
        this.pBytesRead = pBytesRead;
    }
    public long getpContentLength() {
        return pContentLength;
    }
    public void setpContentLength(long pContentLength) {
        this.pContentLength = pContentLength;
    }
    public int getpItems() {
        return pItems;
    }
    public void setpItems(int pItems) {
        this.pItems = pItems;
    }
    public int getPercent() {
        return percent;
    }
    public void setPercent(int percent) {
        this.percent = percent;
    }
    public long getStartTime() {
        return startTime;
    }
    public void setStartTime(long startTime) {
        this.startTime = startTime;
    }
    public long getUseTime() {
        return useTime;
    }
    public void setUseTime(long useTime) {
        this.useTime = useTime;
    }
    @Override
    public String toString() {
        float tmp = (float)pBytesRead;
        float result = tmp/pContentLength*100;
        return "ProgressEntity [pBytesRead=" + pBytesRead + ", pContentLength="
                + pContentLength + ", percentage=" + result + "% , pItems=" + pItems + "]";
    }

}

　　监听器

package ch.system.listener;

import ch.system.bean.ProgressEntity;
import org.apache.commons.fileupload.ProgressListener;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpSession;

/**
 * Description:文件上传的监听器
 *
 * @author cy
 * @date 2018年08月06日 17:59
 * version 1.0
 */

@Component
public class MyProgressListener implements ProgressListener {

    private HttpSession session;

    public void setSession(HttpSession session){
        this.session=session;
        ProgressEntity status = new ProgressEntity();
        session.setAttribute("status", status);
    }

    @Override
    public void update(long pBytesRead, long pContentLength, int pItems) {
        ProgressEntity status = (ProgressEntity) session.getAttribute("status");
        status.setpBytesRead(pBytesRead);
        status.setpContentLength(pContentLength);
        status.setpItems(pItems);
        status.setUseTime(System.currentTimeMillis()-status.getStartTime());
        status.setPercent((int)(pBytesRead*100/pContentLength));
        //完成的计算已完成pBytesRead/1024/1024 M
    }
}

<%@ 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">   <jsp:include page="${contextPath}/views/common/script.jsp"/> <jsp:include page="${contextPath}/views/common/stylesheet.jsp"/> <title>Insert title here</title></head><body>
<div class="progress" style="display: none;"> <div class="progress-bar" role="progressbar" aria-valuenow="60" aria-valuemin="0" aria-valuemax="100" style=" 0;"> <span id="checkProgress"></span> </div></div>
<form id="uploadForm" enctype="multipart/form-data"> 用户名：<input type="text" name="user"/><br/> 文件1：<input type="file" name="file"/><br/> 文件2：<input type="file" name="file02"/><br/></form><button id="upload">上传文件</button>

<form enctype="multipart/form-data" method="post" action="file/upload.action"> 文件3：<input type="file" name="file" multiple="multiple" /><br/> <input type="submit" value="提交"></form>
</body>
<script type="text/javascript"> $(function () { var pro; $("#upload").click(function () { //显示样式 $(".progress").show(); pro = setInterval(progress,1000); var formData = new FormData($('#uploadForm')[0]); formData.append("param","bbbbbbbbbbb"); $.ajax({ type: 'post', url: "file/upload.action", data: formData, cache: false, processData: false, contentType: false, }).success(function (data) { alert(data); }).error(function () { clearInterval(pro); $(".progress").css("display","none"); alert("上传失败"); }); }); function progress () { $.ajax({ type: 'post', url: "file/getProgress.action", data: {}, cache: false, processData: false, contentType: "application/json", }).success(function (data) { if(typeof (data.percent) != "undefind" && data.percent != null){ var per = data.percent +'%'; $(".progress-bar").css("width",per); $("#checkProgress").html(per); if(per == "100%"){ clearInterval(pro); $(".progress").hide(); } } console.log(data); }).error(function () { alert("上传失败"); }); }
});</script>
</html>

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原文地址：https://www.cnblogs.com/chengyangyang/p/9431592.html