SpringMVC实现的文件上传进度条Bootstrap展示

来源：https://blog.csdn.net/frankcheng5143/article/details/51832428

背景

想做一个带进度条的文件上传，可是搜索的结果都不是很满意，最后参考一个实践了一下，基于SpringMVC实现，前端采用Bootstrap。

整理一下进度条的实现。

效果

先看最后的效果

实现步骤

前提

SpringMVC已经配置好了

第一步

写一个进度条pojo

Progress.java

/**
 * 进度条
 * @author 程高伟
 *
 * @date 2016年7月5日 上午9:51:47 
 */
public class Progress {
    private long bytesRead;
    private long contentLength;
    private long items;
    public long getBytesRead() {
        return bytesRead;
    }
    public void setBytesRead(long bytesRead) {
        this.bytesRead = bytesRead;
    }
    public long getContentLength() {
        return contentLength;
    }
    public void setContentLength(long contentLength) {
        this.contentLength = contentLength;
    }
    public long getItems() {
        return items;
    }
    public void setItems(long items) {
        this.items = items;
    }
    @Override
    public String toString() {
        return "Progress [bytesRead=" + bytesRead + ", contentLength=" + contentLength + ", items=" + items + "]";
    }

}

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第二步 实现ProgressListener

依赖的jar包

<dependency>
    <groupId>commons-fileupload</groupId>
    <artifactId>commons-fileupload</artifactId>
    <version>1.3.1</version>
</dependency>
<dependency>
    <groupId>commons-io</groupId>
    <artifactId>commons-io</artifactId>
    <version>2.5</version>
</dependency>

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FileUploadProgressListener.java

import javax.servlet.http.HttpSession;

import org.apache.commons.fileupload.ProgressListener;
import org.springframework.stereotype.Component;
import com.cdpts.wechat.model.Progress;
@Component
public class FileUploadProgressListener implements ProgressListener {
    private HttpSession session;
    public void setSession(HttpSession session){
        this.session=session;
        Progress status = new Progress();//保存上传状态
        session.setAttribute("status", status);
    }
    @Override
    public void update(long bytesRead, long contentLength, int items) {
        Progress status = (Progress) session.getAttribute("status");
        status.setBytesRead(bytesRead);
        status.setContentLength(contentLength);
        status.setItems(items);

    }

}

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第三步 继承CommonsMultipartResolver

import java.util.List;

import javax.servlet.http.HttpServletRequest;

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 com.cdpts.wechat.service.FileUploadProgressListener;
public class CustomMultipartResolver extends CommonsMultipartResolver {
    // 注入第二步写的FileUploadProgressListener 
    @Autowired
    private FileUploadProgressListener progressListener;

    public void setFileUploadProgressListener(FileUploadProgressListener 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);
        }
    }

}

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第四步

在springmvc的配置文件中配置第三步的CustomMultipartResolver

<bean id="multipartResolver" class="com.cdpts.wechat.utils.spring.CustomMultipartResolver"/>

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第五步

编写Controller

    // 处理上传的
    @RequestMapping("/upload")
    public void upload(HttpServletRequest request, HttpServletResponse response,
            @RequestParam("file") CommonsMultipartFile file) throws IOException {
        PrintWriter out;
        boolean flag = false;
        if (file.getSize() > 0) {
            String path = "/assets/upload/files/";
            String uploadPath = request.getSession().getServletContext().getRealPath(path);
            try {
                FileUtils.copyInputStreamToFile(file.getInputStream(),
                        new File(uploadPath, file.getOriginalFilename()));
                flag = true;
            } catch (Exception e) {
            }

        }
        out = response.getWriter();
        if (flag == true) {
            out.print("1");
        } else {
            out.print("2");
        }
    }

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第六步 开发页面

需要bootstrap

html部分

<!-- Modal -->
<div id="batchImportModal" class="modal fade" role="dialog"
    aria-labelledby="gridSystemModalLabel">
    <div class="modal-dialog">
        <div class="modal-content">
            <div class="modal-header">
                <button type="button" class="close" data-dismiss="modal" aria-hidden="true">&times;</button>
                <h4 class="modal-title" id="myModalLabel">批量导入用户</h4>
            </div>
            <div class="modal-body">
                <div class="form-group" id="passwordDiv">
                    <label>选择用户数据文件</label> 
                    <input class="form-control" type="file" id="batchFile">
                </div>
                <div class="progress progress-striped active" style="display: none">
                    <div id="progressBar" class="progress-bar progress-bar-info"
                        role="progressbar" aria-valuemin="0" aria-valuenow="0"
                        aria-valuemax="100" style="width: 0%">
                    </div>
                </div>
                <div class="form-group">
                    <input id="batchUploadBtn" type="submit" name="submit" class="btn btn-success" value="上传" />
                </div>
            </div>
        </div>
        <!-- /.modal-content -->
    </div>
    <!-- /.modal-dialog -->
</div>
<!-- /.modal -->

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JavaScript部分

$(function() {
    // 批量导入按钮
    $("#batchImportBtn").click(function(){
        $('#batchImportModal').modal('show');
    })
    var base = $("#base").val().trim();
    // 上传按钮
    $("#batchUploadBtn").attr('disabled', true);
    // 上传文件按钮点击的时候
    $("#batchUploadBtn").click(function() {
        // 进度条归零
        $("#progressBar").width("0%");
        // 上传按钮禁用
        $(this).attr('disabled', true);
        // 进度条显示
        $("#progressBar").parent().show();
        $("#progressBar").parent().addClass("active");
        // 上传文件
        UpladFile();
    })

    // 文件修改时
    $("#batchFile").change(function() {
        $("#batchUploadBtn").val("上传");
        $("#progressBar").width("0%");
        var file = $(this).prop('files');
        if (file.length != 0) {
            $("#batchUploadBtn").attr('disabled', false);
        }

    });

    function UpladFile() {
        var fileObj = $("#batchFile").get(0).files[0]; // js 获取文件对象
        console.info("上传的文件："+fileObj);
        var FileController = base + "/admin/user/upload"; // 接收上传文件的后台地址 
        // FormData 对象
        var form = new FormData();
        // form.append("author", "hooyes"); // 可以增加表单数据
        form.append("file", fileObj); // 文件对象
        // XMLHttpRequest 对象
        var xhr = new XMLHttpRequest();
        xhr.open("post", FileController, true);
        xhr.onload = function() {
            // ShowSuccess("上传完成");
            alert("上传完成");
            $("#batchUploadBtn").attr('disabled', false);
            $("#batchUploadBtn").val("上传");
            $("#progressBar").parent().removeClass("active");
            $("#progressBar").parent().hide();
            //$('#myModal').modal('hide');
        };
        xhr.upload.addEventListener("progress", progressFunction, false);
        xhr.send(form);
    }
    ;
    function progressFunction(evt) {
        var progressBar = $("#progressBar");
        if (evt.lengthComputable) {
            var completePercent = Math.round(evt.loaded / evt.total * 100)+ "%";
            progressBar.width(completePercent);
            $("#batchUploadBtn").val("正在上传 " + completePercent);
        }
    };
}

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我写了一个简单的开源项目，项目中有一个带进度条的文件上传

效果图如下

完整的jsp页面地址

开源项目github地址，如果觉得可以别忘了给个star哦。

数据库脚本地址 
https://github.com/peer44/java-rbac/blob/master/jrbac/src/main/resources/sql/jrbac.sql