struts1.2上传文件
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。