JavaWeb Struts文件上传功能实现详解
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2024-03-12 18:30:38
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...
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。
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