Struts文件上传

用到的包:一个是commons-fileupload-1.3.2.jar,另一个是commons-io-2.2.jar
第一步:做界面。
1.<input type="file">
2.<form enctype="multipart/form-data">

第二步:做Action。
三个成员:1.File类型 2.String fileFileName属性名 3.String fileContentType属性名
org.apache.commons.io.FileUtils.copyFile很简单。否则用IO流也可以操作。
用IO流操作
InputStream is = new FileInputStream(file);
OutputStream os = new FileOutputStream(new File(root, fileFileName));

byte[] buffer = new byte[500];
int length = 0;

while(-1 != (length = is.read(buffer, 0, buffer.length)))
{
os.write(buffer);
}

os.close();
is.close();

现在我们就做一个简单的上传:

先做页面部分:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>文件上传</h1>
<form action="Upload_upload" method="post" enctype="multipart/form-data"> 
标题:<input type="text" name="title"><br>
<input type="file" name="file"><br>
<input type="submit" value="GO">
</form>
</body>
</html>

然后是Action部分:

package com.itnba.maya.controller;

import java.io.File;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Random;

import org.apache.commons.io.FileUtils;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {
	private String title;
	private File file;
	private String fileFileName;
	private String fileContentType;
	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	public File getFile() {
		return file;
	}
	public void setFile(File file) {
		this.file = file;
	}
	public String getFileFileName() {
		return fileFileName;
	}
	public void setFileFileName(String fileFileName) {
		this.fileFileName = fileFileName;
	}
	public String getFileContentType() {
		return fileContentType;
	}
	public void setFileContentType(String fileContentType) {
		this.fileContentType = fileContentType;
	}
	public String input(){
		return SUCCESS;
	}
	public String upload() throws IOException{
          //获取当前时间 SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddhhmmss"); Date cal = Calendar.getInstance().getTime(); String now = sdf.format(cal);
          //获取四位随机数 Random rand = new Random(); int n = rand.nextInt(9999); DecimalFormat dec = new DecimalFormat("0000"); String sj = dec.format(n);
          //生成地址 File ss = new File("d://"+now+sj+fileFileName); FileUtils.copyFile(file, ss); return SUCCESS; } }

这样就可以了,看下结果:

碰到的问题:

 

1.如何解决文件重名的问题?
加时间,随机数,用户名,序列号
2.如何解决大文件上传的问题?
在struts.xml 中添加常量。这个常量在struts.properties中(/org/apache/struts2/default.properties)。
<constant name="struts.multipart.maxSize" value="20971520"></constant>

3.怎么上传多个文件:

把相应的成员变成数组即可。

页面代码如下:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<h1>文件上传</h1>
<form action="Upload_upload" method="post" enctype="multipart/form-data"> 
标题:<input type="text" name="title"><br>
<input type="file" name="file"><br>
<input type="file" name="file"><br>
<input type="file" name="file"><br>
<input type="file" name="file"><br>
<input type="file" name="file"><br>
<input type="file" name="file"><br>

<input type="submit" value="GO">
</form>
</body>
</html>

Action代码:

package com.itnba.maya.controller;

import java.io.File;
import java.io.IOException;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.Random;

import org.apache.commons.io.FileUtils;

import com.opensymphony.xwork2.ActionSupport;

public class UploadAction extends ActionSupport {
	private String title;
	private File[] file;
	private String[] fileFileName;
	private String[] fileContentType;
	public String getTitle() {
		return title;
	}
	public void setTitle(String title) {
		this.title = title;
	}
	public File[] getFile() {
		return file;
	}
	public void setFile(File[] file) {
		this.file = file;
	}
	public String[] getFileFileName() {
		return fileFileName;
	}
	public void setFileFileName(String[] fileFileName) {
		this.fileFileName = fileFileName;
	}
	public String[] getFileContentType() {
		return fileContentType;
	}
	public void setFileContentType(String[] fileContentType) {
		this.fileContentType = fileContentType;
	}
	public String input(){
		return SUCCESS;
	}
	public String upload() throws IOException{
		SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddhhmmss");
		Date cal = Calendar.getInstance().getTime();
		String now = sdf.format(cal);
		Random rand = new Random();
		int n = rand.nextInt(9999);
		DecimalFormat dec = new DecimalFormat("0000");
		String sj = dec.format(n);
		for(int i = 0 ;i<file.length;i++){
			File ss = new File("d://"+now+sj+fileFileName[i]);
			FileUtils.copyFile(file[i], ss);
		}
		
		return SUCCESS;
	}
}

看下我们的结果:

我们在这里只选取一部分添加看下能不能完成上传,

这样一个简单的上传就完成了,如果想用功能更加全面,界面更加好看的就需要引用js,jquery等插件去完成了,这里就不一一验证了

posted on 2017-03-20 14:35  云破月丶  阅读(159)  评论(0编辑  收藏  举报