JavaWeb Struts文件上传功能实现详解

JavaWeb Struts文件上传功能实现详解

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：

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。

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"%>

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 SimpleqkgtoDateFormat("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：

"-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"

"http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">

name="uploadForm" scope="request" type="com.zyy.struts.action.UploadAction">

name="uploadForm" scope="request" type="com.zyy.struts.action.UploadAction">

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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