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22.JavaWeb基础 Strut 1 文件上传

2014-08-18 15:39 330 查看
一.Struts文件上传的思路

  之前也讲过了FileUpload这个组件，功能很强大，但是操作繁琐复杂。这次，在Strust 中

也对文件上传有所支持，并FileUpload进行了包装，用起来方便了许多。

这里涉及到了一个标签和一个类：

<html:file property="对应ActionForm中的属性名称">

用这个标签可以上传文件，但是要接收次内容必须依靠org.apache.struts.upload.FormFile

接口完成。

FormFile接口的常用方法
方法类型描述
public byte[] getFileData() throws 

FileNotFoundWException , IOException 
普通取得上传文件的大小
public InputStream getInputStream() throws 

FileNotFoundWException , IOException
普通
取得上传文件的输入流
public int getFileSize()普通
取得上传文件的大小
public String getFileName()普通
取得上传文件的名称
public String getContentType()普通
取得上传文件的类型
二.实现

sh.jsp：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean"
prefix="bean"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html"
prefix="html"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-logic"
prefix="logic"%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>

<title>sh.jsp</title>

<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">

</head>

<body>

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

<html:file property="photo"></html:file>
<html:submit value="上传"></html:submit>

</html:form>

</body>
</html>


UploadForm.java：

package com.zyy.struts.form;

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

public class UploadForm extends ActionForm {

private FormFile photo;

public FormFile getPhoto() {
return photo;
}

public void setPhoto(FormFile photo) {
this.photo = photo;
}

}


IPTimeStamp.java:

package com.zyy.util;

import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Random;

public class IPTimeStamp {
private SimpleDateFormat sdf = null;
private String ip = null;

public IPTimeStamp() {
}

public IPTimeStamp(String ip) {
this.ip = ip;
}

public String getIPTimeRand() {
StringBuffer buf = new StringBuffer();
if (this.ip != null) {
String s[] = this.ip.split("\\.");
for (int i = 0; i < s.length; i++) {
buf.append(this.addZero(s[i], 3));
}
}
buf.append(this.getTimeStamp());
Random r = new Random();
for (int i = 0; i < 3; i++) {
buf.append(r.nextInt(10));
}
return buf.toString();
}

public String getDate() {
this.sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
return this.sdf.format(new Date());
}

public String getTimeStamp() {
this.sdf = new SimpleDateFormat("yyyyMMddHHmmssSSS");
return this.sdf.format(new Date());
}

private String addZero(String str, int len) {
StringBuffer s = new StringBuffer();
s.append(str);
while (s.length() < len) {
s.insert(0, "0");
}
return s.toString();
}

public static void main(String args[]) {
System.out.println(new IPTimeStamp("192.168.1.1").getIPTimeRand());
}
}


UploadAction.java：

package com.zyy.struts.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.zyy.struts.form.UploadForm;
import com.zyy.util.IPTimeStamp;

public class UploadAction extends Action {

public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {

UploadForm uploadForm = (UploadForm) form;

IPTimeStamp ips = new IPTimeStamp(request.getRemoteAddr());

// 文件名
String fileName = ips.getIPTimeRand()
+ "."
+ uploadForm.getPhoto().getFileName().split("\\.")[uploadForm
.getPhoto().getFileName().split("\\.").length - 1];

// 输出路径
File outFile = new File(super.getServlet().getServletContext()
.getRealPath("/")
+ "upload" + File.separator + fileName);

// 存放图片的文件夹
File file = new File(super.getServlet().getServletContext()
.getRealPath("/")
+ "upload");
if (!file.exists()) {

file.mkdir();

}

InputStream input = uploadForm.getPhoto().getInputStream();

OutputStream output = new FileOutputStream(outFile);

byte data[] = new byte[1024];

int temp = 0;

while ((temp = input.read(data, 0, 1024)) != -1) {

output.write(data);

}

output.close();
input.close();

return null;
}

}


struts-config.xml：

<?xml version="1.0" encoding="ISO-8859-1" ?>

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

<struts-config>
<form-beans>

<form-bean name="uploadForm" type="com.zyy.struts.form.UploadForm"></form-bean>

</form-beans>

<global-exceptions>
</global-exceptions>

<global-forwards>
</global-forwards>

<action-mappings>

<action path="/jsp/upload" attribute="uploadForm" input="/jsp/sh.jsp"
name="uploadForm" scope="request" type="com.zyy.struts.action.UploadAction">

</action>

</action-mappings>

<message-resources parameter="resource.MessageResources" />
</struts-config>




由于我保存在的是super.getServlet().getServletContext().getRealPath("/")+ "upload"

这是虚拟目录的真实路径的upload文件夹下。



由此可见，在Struts中的文件上传原理和FileUpload一样，但是Struts进行了包装，所以

用起来明显比单独用FileUpload组件方便了许多。
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