spring实现文件上传

Spring由内置的multipart支持web应用中的文件上传。multipart支持的设计是通过定义org.springframework.web.multipart包中的插件对象MultipartResovler来完成的。Spring提供MultipartResolver可以支持Commons FileUpload (http://jakarta.apache.org/commons/fileupload)和COS FileUpload (http://www.servlets.com/cos)。本章后面的部分描述了文件上传是如何支持的。

缺省，Spring是没有multipart处理，因为一些开发者想要自己处理它们。如果你想使用Spring的multipart，需要在web应用的上下文中添加multipart解析器。这样，每个请求就会被检查是否包含multipart。然而，如果请求中包含multipart，你的上下文中定义的MultipartResolver就会解析它。这样，你请求中的multipart属性就会象其它属性一样被处理。

使用MultipartResolver
下面的例子说明了如何使用CommonsMultipartResolver：

<bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">

    <!-- one of the properties available; the maximum file size in bytes -->
    <property name="maximumFileSize">
        <value>100000</value>
    </property>
</bean>---------------------------------------------------------------------------------------------------下面这部分是我的配置文件部分------------------------------ <!-- 配置上传文件--> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  <property name="maxUploadSize">   <value>1000000</value>  </property> </bean>  <bean id="uploadControl" class="com.f9inux.controller.uploadController">  <property name="commandClass">   <value>com.f9inux.bean.uploadfilebean</value>  </property>  <property name="successView">   <value>index</value>  </property>  <property name="path">   <value>g:\web</value>  </property> </bean>  <!-- 配置上传文件-->-----------------上面由于我使用了springMVC如果有不明白的可以给我留言-----------------------------uploadController部分（类似于struts的action）-----------------package com.f9inux.controller;import java.io.BufferedOutputStream;import java.io.FileOutputStream;import javax.servlet.ServletRequest;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.validation.BindException;import org.springframework.web.bind.ServletRequestDataBinder;import org.springframework.web.multipart.support.ByteArrayMultipartFileEditor;import org.springframework.web.servlet.ModelAndView;import org.springframework.web.servlet.mvc.SimpleFormController;import com.f9inux.bean.uploadfilebean;public class uploadController extends SimpleFormController { protected String path;  public void setPath(String path) {  this.path = path; } public ModelAndView onSubmit(HttpServletRequest request,                        HttpServletResponse response,                        Object command,BindException errors)throws Exception{  uploadfilebean ub=(uploadfilebean)command;  //System.out.println(ub.getName());  //String sp=path+System.getProperty("file.separator")+ub.getName();  String sp=path+"\\"+ub.getName();  //System.out.println(sp);//输出存放目录  BufferedOutputStream bf=new BufferedOutputStream(new FileOutputStream(sp));  bf.write(ub.getContents());  bf.close();  return new ModelAndView(this.getSuccessView()); }  public void initBinder(HttpServletRequest request,                  ServletRequestDataBinder binder)throws Exception{  super.initBinder(request,binder);  binder.registerCustomEditor(    byte[].class,new ByteArrayMultipartFileEditor()); }}-----------------------上面主要实现的保存文件的逻辑---------------------------------------------uploadfilebean部分（这部分主要负责表单内容的承载，类似实体bean）--------package com.f9inux.bean;public class uploadfilebean { private String name;  private byte[] contents;  public byte[] getContents() {  return contents; } public String getName() {  return name; } public void setContents(byte[] contents) {  this.contents = contents; } public void setName(String name) {  this.name = name; }}------------------上面的属性和表单的控件相对应---------------------------------表单部分------------------- <form method="post" action="upload.do" enctype="multipart/form-data">            <input type="file" name="contents" onchange="getvalue()"/>            <input type="hidden" name="name"/>            <input type="submit"/> </form>关于enctype部分的解释：使用multipart，你需要创建一个带文件上传域的表单，让Spring将文件绑定到你的表单上------------------------------------------最后请在你的tomcat的command/lib目录中添加commons-io.jar、commons-fileupload.jar包~~！

 

 

 

 

 

 

 

web.xml片段：

  

<servlet>
        <servlet-name>springServlet</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <load-on-startup>2</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springServlet</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

 

 

servlet.xml片段：

 

<bean id="multipartResolver"
           class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
            <!-- 设置上传文件的最大尺寸为10MB -->
            <property name="maxUploadSize">
            <value>100010485761</value>
        </property>
    </bean>

 

 

Controller：

 

@RequestMapping(params = "method=upload")
    protected ModelAndView uploadFile(HttpServletRequest request)
            throws Exception {
        try{
            //cast to multipart file so we can get additional information
            MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
            CommonsMultipartFile file = (CommonsMultipartFile) multipartRequest.getFile("file");
            System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
            byte[] bytes = file.getBytes();
            String uploadDir = "c:\\uploadFile";
            System.out.println(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>" + uploadDir);
            File dirPath = new File(uploadDir);
            if (!dirPath.exists()) {
                dirPath.mkdirs();
            }
            String sep = System.getProperty("file.separator");
            if (log.isDebugEnabled()) {
                log.debug("uploading to: " + uploadDir + sep +
                file.getOriginalFilename());
                }
            File uploadedFile = new File(uploadDir + sep
                    + file.getOriginalFilename());
            FileCopyUtils.copy(bytes, uploadedFile);
            System.out.println("********************************");
            System.out.println(uploadedFile.getAbsolutePath());
            System.out.println(bytes.length);
            System.out.println("********************************");
        }catch(Exception e){
            e.printStackTrace();
        }
        return new ModelAndView("");
    }

 

页面：

 

<form method="post" action="collParam.do?method=upload" enctype="multipart/form-data">
<input type="file" name="file" id="file"/>
<input type="submit" value="save"/>
</form>