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struts1.2上传文件

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struts提供了<html:file>标签，集成了Apache的commons-upload工具包，上传文件变得更加简单，不再需要解析Request、遍历所有的输入域、判断是否为文件等。

struts对Apache的commons-upload进行了再封装，把上传文件封装成FormFile对象，直接获取该对象，将文件数据保存即可。

 

 

代码1：UploadForm.java

 

 

 

package com.strust1.test.actionFrom;

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

public class UploadForm extends ActionForm {
	private FormFile file;
	private String action;
	private String text;
	public FormFile getFile() {
		return file;
	}
	public void setFile(FormFile file) {
		this.file = file;
	}
	public String getAction() {
		return action;
	}
	public void setAction(String action) {
		this.action = action;
	}
	public String getText() {
		return text;
	}
	public void setText(String text) {
		this.text = text;
	}
	

}

 

 

 

代码2：upload.jsp

 

 

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://struts.apache.org/tags-bean" prefix="bean" %>
<%@ taglib uri="http://struts.apache.org/tags-html" prefix="html" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">
    
    <title>My JSP 'upload.jsp' starting page</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    <html:form action="/upload?action=upload" enctype="multipart/form-data">
    	文件：<html:file property="file" style="width:200px;"></html:file><br/>
    	备注：<html:textarea property="text" style="width:200px"></html:textarea><br/>
    	<html:submit value="开始上传"></html:submit>
    	
    </html:form>
  </body>
</html>
 

 

注意：上传文件时Form表单要指定enctype为multipart/form-data，method一定要设置为POST。<html:form/>标签默认为POST。

 

 

 

FormFile并不是普通的文件，不能直接保存。FormFile提供getInputStream()接口，可以获得它的输入流，将它的内容保存到指定的文件中即可。

 

 

 

代码3：UploadAction.java

 

 

package com.strust1.test.action;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

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 com.strust1.test.actionFrom.UploadForm;

public class UploadAction extends Action {
	@Override
	public ActionForward execute(ActionMapping mapping, ActionForm form,
			HttpServletRequest request, HttpServletResponse response)
			throws Exception {
		 UploadForm uploadForm = (UploadForm)form;
		 if("upload".equals(uploadForm.getAction())){
			 return upload(mapping, form, request, response);
		 }
		 return mapping.getInputForward();
	}
	public ActionForward upload(ActionMapping mapping, ActionForm form, HttpServletRequest request, HttpServletResponse response)throws Exception{
		UploadForm uploadForm =(UploadForm)form;
		StringBuffer buffer = new StringBuffer();
		buffer.append("<style> body{font-size:12px;}</style>");
		if(uploadForm.getFile() != null && uploadForm.getFile().getFileSize() > 0){
			File classes = new File(getClass().getClassLoader().getResource("").getFile());//获得文件夹/WEB-INF/Classes
			File uploadFolder = new File(classes.getParentFile().getParentFile() , "upload");//获取文件夹webRoot下的文件夹/upoad
			uploadFolder.mkdirs();//创建文件夹
			File file = new File(uploadFolder, uploadForm.getFile().getFileName());//保存到 /upload/下面
			System.out.println(file.getPath());
		    OutputStream ous = null;
		    InputStream ins =null;
		    try{
		    	 byte[] b = new byte[1024];
				    int len = 0;
				    ins = uploadForm.getFile().getInputStream();
				    ous = new FileOutputStream(file);
				    while((len = ins.read(b)) != -1){
				    	ous.write(b ,0 ,len);
				    }
		    }finally{
		    	ins.close();
		    	ous.close();
		    	
		    }
		    buffer.append("文件：<a href=upload/" + file.getName() + "target=_blank>" + file.getName() + "</a><br/>");
		}else{
			buffer.append("文件： 没有选择文件<br/>");
		}
		buffer.append("备注：" + uploadForm.getText() + "<br/>");
		response.setCharacterEncoding("UTF-8");
		response.getWriter().write(buffer.toString());
		return null;
	}
}

 

文件保存在本Web应用的/upload文件夹下。

 

 

 

 

 

 

 

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