struts1中的文件上传

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在 struts1 和 2 中，分别对 commons-fileupload 组件进行了包装，使文件上传操作更方便。

本文讲解如何使用 struts1 上传文件。

步骤：

1 编写 jsp 页面

2 给 jsp 中的 form 表单配置一个 ActionForm

3 编写 Action ，处理文件上传功能

4 配置 struts-config.xml 文件

5 测试

1、 首先有个 jsp 页面 —upload_form.jsp

<%@ page language = "java" contentType = "text/html; charset=ISO-8859-1"

pageEncoding = "ISO-8859-1" %>

<%@ taglib uri = "/WEB-INF/struts-html.tld" prefix = "html" %>

<! 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=ISO-8859-1" >

< title > Upload File </ title >

</ head >

< body >

< html:form action = " upload.do " method = "post" enctype = " multipart/form-data " >

< html:file property = " file " ></ html:file >

< input type = "submit" value = "Submit" />

</ html:form >

</ body >

</ html >

其中的 action 是指提交到的 action

enctype 是指表单提交的数据格式

2 给上面的 jsp 中表单配一个 ActionForm –UploadForm

public class UploadForm extends ActionForm {

private static final long serialVersionUID = 1L;

private FormFile file ;

public FormFile getFile() {

return file ;

}

public void setFile(FormFile file) {

this . file = file;

}

}

其中的 file 成员变量对应 upload_form.jsp 表单中为 file 的 property 。

在 struts1 中，文件对象被封装成了 org.apache.struts.upload.FormFile 对象。

3 编写 action –UploadAction

继承 org.apache.struts.action.Action 类

public class UploadAction extends Action {

Logger logger = Logger.getLogger (UploadAction. class );

@Override

public ActionForward execute(ActionMapping mapping, ActionForm form,

HttpServletRequest request, HttpServletResponse response)

throws Exception {

// 将缓存表单数据的 form 强转成 UploadForm 类型，得到其中的 file 变量

UploadForm uf = (UploadForm) form;

FormFile ff = uf.getFile();

// 输出 UploadForm 中的变量 file 的信息 - 文件名 - 文件大小

logger .debug( "file name : " + ff.getFileName());

logger .debug( "file size : " + ff.getFileSize());

// 得到该文件的输入流

InputStream is = ff.getInputStream();

// 该文件要保存的路径 - 文件名 ， “upload” 为 web-root 下的一文件夹名，

// getServlet().getServletContext().getRealPath("upload") 得到 "upload" 文件夹在服务器端的相对位置

// ff.getFileName() 为保存时的文件名

File file = new File(getServlet().getServletContext().getRealPath(

"upload" ), ff.getFileName());

logger .debug(file.getPath());

// 创建一个输出流

BufferedOutputStream bos = new BufferedOutputStream(

new FileOutputStream(file));

// 从输入流中读取字节，通过输出流写入 file 文件中

int b = -1;

while ((b = is.read()) != -1) {

bos.write(b);

}

bos.close();

is.close();

return mapping.findForward( "success" );

}

}

4 编写配置文件 struts-config.xml

<? xml version = "1.0" encoding = "UTF-8" ?>

<! DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd" >

< struts-config >

< data-sources />

< form-beans >

< form-bean name = "uploadForm" type = "zl.form.UploadForm" />

</ form-beans >

< action-mappings >

< action path = "/upload" type = "zl.action.UploadAction" name = "uploadForm" >

</ action >

</ action-mappings >

</ struts-config >

其中 /upload 是 upload_form.jsp 提交到的地址相对应。

5 运行

运行成功， console 会打印所上传文件的 name size path 的值。

21:21:30,859 DEBUG UploadAction:33 - file name : Eclipse&#25253;&#34920;&#24037;&#20855;.bmp

21:21:30,859 DEBUG UploadAction:34 - file size : 1026198

21:21:30,859 DEBUG UploadAction:45 - D:/Program Files/tomcat6.0/webapps/test2/upload/Eclipse&#25253;&#34920;&#24037;&#20855;.bmp