初识Struts（七）----Struts文件上传

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采用 Struts 可以很方便的实现文件上传工作

 

<!---->1、 <!---->上传的页面， upload.jsp ：

   <li>测试struts文件上传</li><br>
   <form action="upload.do" method="post" enctype="multipart/form-data">
        文件名：<input type="text" name="title"><br>
        文件:<input type="file" name="myfile"><br>
        <input type="submit" value="上传">
   </form>

enctype="multipart/form-data" 就是把你表单的所有信息以流方式提交，页面上的所有信息已经都转换为了文件流，为的是能让服务端得到你上传的文件的文件流。 文件项的 type 必须为 file

 

2 、建立 ActionForm( 注意：必须要用 FormFile 来接收上传的文件 ) ， UploadActionForm.java ：

package cn.huan.struts;

import org.apache.struts.action.ActionForm;
import org.apache.struts.upload.FormFile;

/**
 * 文件上传ActionForm
 * @author 刘银环
 *
 */
public class UploadActionForm extends ActionForm {
	//文件名
	private String title;
	
	//必须要用FormFile
	private FormFile myfile;

	/**
	 * @return the title
	 */
	public String getTitle() {
		return title;
	}

	/**
	 * @param title the title to set
	 */
	public void setTitle(String title) {
		this.title = title;
	}

	/**
	 * @return the myfile
	 */
	public FormFile getMyfile() {
		return myfile;
	}

	/**
	 * @param myfile the myfile to set
	 */
	public void setMyfile(FormFile myfile) {
		this.myfile = myfile;
	}

}

 

3 、 Action 中调用 FormFile 中的数据，采用流输出， UploadTestAction.java ：

package cn.huan.struts;

import java.io.FileOutputStream;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.DynaActionForm;
import org.apache.struts.upload.FormFile;

/**
 * 文件上传Action
 * @author 刘银环
 *
 */
public class UploadTestAction extends Action {

	/* (non-Javadoc)
	 * @see org.apache.struts.action.Action#execute(org.apache.struts.action.ActionMapping, org.apache.struts.action.ActionForm, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
	 */
	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		UploadActionForm uaf = (UploadActionForm) form;
		String title = uaf.getTitle();
		FormFile myFile = uaf.getMyfile();
		
		FileOutputStream fos = new FileOutputStream("G:\\" + myFile.getFileName());
		fos.write(myFile.getFileData());
		fos.flush();
		fos.close();
		
		return mapping.findForward("success");
	}

}

 

4 、将 ActionForm 和 Action 配到 struts-config.xml 文件中：

<struts-config>

      <form-beans>
        <form-bean name="uploadForm" type="cn.huan.struts.UploadActionForm"/>
      </form-beans>

      <action-mappings>  
         <action path="/upload"
                 type="cn.huan.struts.UploadTestAction"
                 name="uploadForm"
                 scope="request"
         >
           <forward name="success" path="/upload_success.jsp"/>
         </action>
      </action-mappings>
</struts-config>

 

 

5 、还可在 struts-config.xml 文件中配置上传的参数，如设置上传的文件大小最大为 50M ：

  <controller maxFileSize="50M"/>

 

到此， struts 文件上传工程建立完毕。

 

另：上面的 ActionForm 当然也可以采用 DynaActionForm 来完成，从而不用建 ActionForm 类， UploadTestAction 中相应代码改为：

		DynaActionForm daf = (DynaActionForm) form;
		String title = daf.getString("title");
		FormFile myFile = (FormFile) daf.get("myfile");
		System.out.println("Title:"+title);
		
		FileOutputStream fos = new FileOutputStream("G:\\" + myFile.getFileName());
		fos.write(myFile.getFileData());
		fos.flush();
		fos.close();
		
		return mapping.findForward("success");

struts-config.xml 文件中关于 ActionForm 和 Action 的配置相应改为：

<struts-config>

      <form-beans>
        <!--  DynaActionForm for the upload -->
        <form-bean name="dynaForm2" type="org.apache.struts.action.DynaActionForm">
               <form-property name="title" type="java.lang.String"/>
               <form-property name="myfile" type="org.apache.struts.upload.FormFile"/>
        </form-bean>
      </form-beans>

      <action-mappings>
         <action path="/upload"
                 type="cn.huan.struts.UploadTestAction"
                 name="dynaForm2"
                 scope="request"
         >
           <forward name="success" path="/upload_success.jsp"/>
         </action>
      </action-mappings>
      
      <controller maxFileSize="50M"/>
</struts-config>

 。。。。。。。。。