springMVC上传下载

利用spring上传下载文件

先添加依赖

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

 

在springMVC配置文件中加入bean

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <property name="defaultEncoding">
        <value>UTF-8</value>
    </property>
    <property name="maxUploadSize">
        <value>10485760</value>
    </property>
    <property name="maxInMemorySize">
        <value>4096</value>
    </property>
</bean>

 

上传jsp页面

<link href="<c:url value="/static/css/bootstrap-fileupload.css"/>" rel="stylesheet" type="text/css"/>
<script src="<c:url value="/static/js/bootstrap-fileupload.js"/>" type="text/javascript"></script>

<form id="upLoadForm" enctype="multipart/form-data" method="post" action="<c:url value='/qrcAgentQrCodeDetail/upLoad'/>">
    <div class="span3">
        <div class="control-group">
            <label class="control-label">背景图片:</label>
            <div class="controls ">
                <div class="fileupload fileupload-new must"
                    data-provides="fileupload">
                    <span class="btn btn-file"> 
                        <i class="icon-upload-alt"></i> 
                        <span class="fileupload-new ">PNG格式</span>
                        <span class="fileupload-exists">修改</span> 
                        <input type="file" name="fileMap[filePath]" class="default " accept=".PNG"/> 
                    </span> 
                    <span class="fileupload-preview"></span> 
                    <a href="#"    class="close fileupload-exists" data-dismiss="fileupload" style="float: none"></a>
                </div>
            </div>
        </div>
    </div>
</form>

 

上传代码

form

import java.util.HashMap;
import java.util.Map;

import org.springframework.web.multipart.MultipartFile;

public class QRCodeForm {    
     
    private Map<String, MultipartFile> fileMap = new HashMap<String, MultipartFile>();

    public Map<String, MultipartFile> getFileMap() {
        return fileMap;
    }

    public void setFileMap(Map<String, MultipartFile> fileMap) {
        this.fileMap = fileMap;
    }

}

 

controller

/**
 * 图片上传
 * @param form
 * @param ra
 * @return
 */
@RequestMapping(value = "/upLoad",method = RequestMethod.POST)
public String upLoad(QRCodeForm form,RedirectAttributes ra){
    String url = "redirect:/qrcAgentQrCodeDetail/query";
    try {
        qrcAgentQrCodeDetailService.upLoad(form.getFileMap());
        ra.addFlashAttribute(Message.SUCCESS, "图片上传成功");
    } catch (Exception e) {
        e.printStackTrace();
        ra.addFlashAttribute(Message.ERROR, "图片上传失败");
    }
    return url;
}

 

service

@Override
public void upLoad(Map<String, MultipartFile> fileMap)throws IOException {
    String baseDir = paramService.getSFTPFilePath();
    for(Map.Entry<String, MultipartFile> entity:fileMap.entrySet()){
        if(entity.getKey().equals("filePath")){
            String prefixPath = baseDir + "/QRCode";
            String sourceFileName = entity.getValue().getOriginalFilename();
            String suffix = sourceFileName.substring(sourceFileName.lastIndexOf(".")+1);
            String newFileName = new SimpleDateFormat("SSS").format(new Date())+"FILE."+suffix;
            String filePath = prefixPath+"/"+newFileName;
            
            File file = new File(prefixPath);
            if(!file.exists()){
                file.mkdirs();
            }
            OutputStream os = new FileOutputStream(filePath);
            int len;
            byte [] bs = new byte[1024];
            InputStream inputStream = entity.getValue().getInputStream();
            while((len = inputStream.read(bs))!= -1){
                os.write(bs,0,len);
            }
            os.close();
            inputStream.close();
            
            Param param = paramService.getParam(QR_BACKGROUDPATH);
            param.setStrVal(filePath);
            qrcAgentQrCodeDetailDao.save(param);
        }
    }
    
}

 

下载jsp页面

<div class="row-fluid">
    <div class="span6">
        <div class="control-group">
            <label class="control-label">资质材料:</label>
            <div class="controls">
                <c:if test="${not empty agent.filePath}">
                    <a class="btn green" data-rel="fancybox-button" 
                        href="<c:url value="/agent/download.html?filePath=${agent.filePath}"/>"
                        <i class="icon-download-alt"></i>点此下载文件
                    </a>    
                </c:if>
                <c:if test="${empty agent.filePath}">
                    <span class="text">未找到资质文件</span>
                </c:if>
            </div>
        </div>
    </div>
</div>

 

下载代码

@RequestMapping("/download")
public String download(String filePath,HttpServletResponse response,RedirectAttributes ra){
    
    try {
        // path是指欲下载的文件的路径。
        File file = new File(filePath);
        // 取得文件名。
        String filename = file.getName();

        // 以流的形式下载文件。
        InputStream fis = new BufferedInputStream(new FileInputStream(filePath));
        byte[] buffer = new byte[fis.available()];
        fis.read(buffer);
        fis.close();
        // 清空response
        response.reset();
        // 设置response的Header
        response.addHeader("Content-Disposition", "attachment;filename=" + new String(filename.getBytes()));
        response.addHeader("Content-Length", "" + file.length());
        OutputStream toClient = new BufferedOutputStream(response.getOutputStream());
        response.setContentType("application/octet-stream");
        toClient.write(buffer);
        toClient.flush();
        toClient.close();
    } catch (IOException ex) {
        ex.printStackTrace();
        ra.addFlashAttribute(Message.ERROR, "下载出错，请稍后");
        return InternalResourceViewResolver.REDIRECT_URL_PREFIX + "/agent/index";
    }
    return null;
}