JavaWeb Struts文件上传功能实现详解
发布于 2017-11-23 11:54:21 | 148 次阅读 | 评论: 0 | 来源: 网友投递
Java程序设计语言
java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言，是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台（即JavaEE(j2ee), JavaME(j2me), JavaSE(j2se)）的总称。
这篇文章主要为大家详细介绍了JavaWeb Struts文件上传功能实现过程，思路清晰，供大家参考，感兴趣的小伙伴们可以参考一下
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。
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。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持PHPERZ。
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