Apache Commons Configuration/FileUpload

一、Apache Commons-configuration

(1)如果要使用configuration这个包，首先要保证使用JDK1.2以上，还要引入如下jar包
commons-beanutils
commons-lang
commons-logging
commons-collections
commons-digester
commons-codec
commons-jxpath

(2)commons-configuration最新的版本是1.5，最主要的作用是读取资源文件，每一种文件格式都有一个对应的类，如下
properties文件--PropertiesConfiguration类
xml文件--XMLConfiguration
.ini文件--INIConfiguration
.plist文件--PropertyListConfiguration
还可以从JNDI中读取properties--JNDIConfiguration
当然还可以使用system的properties--SystemConfiguration

(3)用Properties读取配置文件

usergui.properties(放在类根路径下面):

colors.background = #FFFFFF
colors.foreground = #000080

window.width = 500
window.height = 300

keys=cn,com,org,uk,edu,jp,hk
<1>一般写法：

public static  void readProperties(){
    	InputStream in=null;
		try {
			in = new BufferedInputStream((new ClassPathResource("usergui.properties")).getInputStream());
		} catch (IOException e1) {
			e1.printStackTrace();
		}
    	Properties p=new Properties();
    	try {
			p.load(in);
			System.out.println(p.getProperty("colors.background"));
		} catch (IOException e) {
		}
}

另一种ResourceBundle方式:

	public static void readProperties() {
		Locale locale = Locale.getDefault();
		ResourceBundle localResource = ResourceBundle.getBundle("usergui", locale);
		String value = localResource.getString("colors.background");
		System.out.println("ResourceBundle: " + value);
	}

<2>使用PropertiesConfiguration

	public static void loadProperty(){
		try {
			PropertiesConfiguration config = new PropertiesConfiguration("usergui.properties");
			config.setProperty("colors.background", "#00000F");//更改值
			config.save();
			config.save("usergui.backup.properties");//save a copy
			System.out.println(config.getProperty("colors.background"));
			System.out.println(config.getInt("window.width"));
			String[] keys=config.getStringArray("keys");   
			List key2=config.getList("keys");  
			for(int i=0;i<keys.length;i++){
				System.out.println(keys[i]);
			}
			for(Object str:key2){
				System.out.println(str.toString());
			}
			}catch(Exception e){
				
			}
	}

二、Apache Commons-FileUpload:

package com.logcd.servlet;

import java.io.File;
import java.io.IOException;
import java.util.Iterator;
import java.util.List;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
 
@SuppressWarnings("serial")
public class Upload extends HttpServlet {
	
    private String uploadPath = "D:\\uploadDir"; // 上传文件的目录
 
    @SuppressWarnings("unchecked")
    public void doPost(HttpServletRequest request, HttpServletResponse response)
           throws IOException, ServletException {
       try {
           DiskFileItemFactory factory = new DiskFileItemFactory();
 
           factory.setSizeThreshold(4096); // 设置缓冲区大小，这里是4kb
 
           ServletFileUpload upload = new ServletFileUpload(factory);
 
           upload.setSizeMax(4194304); // 设置最大文件尺寸，这里是4MB
           
           List<FileItem> items = upload.parseRequest(request);// 得到所有的文件
           Iterator<FileItem> i = items.iterator();
           StringBuilder msgBuilder = new StringBuilder();//用于返回上传的文件
           
           while (i.hasNext()) {
              FileItem fi = (FileItem) i.next();
              String fileName = fi.getName();
              if (fileName != null) {
                  File fullFile = new File(fi.getName());
                  File savedFile = new File(uploadPath, fullFile.getName());
                  fi.write(savedFile);
                  
                  msgBuilder.append(fullFile.getName());
                  msgBuilder.append("&nbsp;&nbsp;");
                  msgBuilder.append("<a href=\"javascript:void(0);\" onclick=\"\" >");
                  msgBuilder.append("删&nbsp;除");
                  msgBuilder.append("</a><br/>");
              }
           }
           
           request.setCharacterEncoding("GBK");//设置页面编码 
           response.setContentType("text;charset=GBK");//内容类型
           response.getWriter().println("<script>parent.callback('"+ msgBuilder.toString() +"')</script>");
           
       } catch (Exception e) {
           e.printStackTrace();
           response.sendRedirect("<script>parent.callback('sorry,文件上传失败！')</script>");
       }
    }
 
    public void init() throws ServletException {
       File uploadFile = new File(uploadPath);
       if (!uploadFile.exists()) {
           uploadFile.mkdirs();
       }
    }
}

upload.html实现无刷新文件上传。

<!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=GB2312">
<title>文件上传</title>
<style type="text/css">
body{
   font-size: 12px;
}
a{
   text-decoration: none;
}
</style>
</head>
<body>

<form action="fileupload" id="form1" name="form1" encType="multipart/form-data"  method="post" target="hidden_frame" >
	<span id="msg"></span>
	<br>
	<input type="file" id="file" name="file" accept="doc,xls,rar"
	       style="border:1px solid #2D147E;background:#eeeeee;color:#2D147E;font:bold 12px ’隶书’;height:18px;width:300px"
	        onchange="uploadFile(this);">
	<br>
	<font style="color: red;font-size: 12px;">信息提示：支持doc,xls,rar文件的上传</font>    
	          
	<iframe name='hidden_frame' id="hidden_frame" style='display:none'></iframe>
</form>

</body>
</html>

<script type="text/javascript">
function $(id){
    return document.getElementById(id);
}

function verifyAccept(obj){
	var aAccetpType, sFileType;
	var sAccetpType = obj.accept.toLowerCase();
	if(sAccetpType.length > 0){
		aAccetpType = sAccetpType.split(",");
	}

	if(obj.value != "" && aAccetpType.length > 0){
		sFileType = obj.value.replace(/.*\./g,"").toLowerCase();
		
		var isAccept = sAccetpType.indexOf(sFileType);

		if(isAccept == -1) {
			alert("不支持此文件类型！");
			obj.outerHTML = obj.outerHTML;
			return false;
		}
	}
	return true;
}

function uploadFile(obj){
    if(verifyAccept(obj)){
       $("form1").submit();
    }
}

function callback(msg){
	$("file").outerHTML = $("file").outerHTML;
	$("msg").innerHTML = $("msg").innerHTML + "<font color=green>"+msg+"</font>";
}
</script>

   <servlet>
        <servlet-name>Upload</servlet-name>
        <servlet-class>com.logcd.servlet.Upload</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>Upload</servlet-name>
        <url-pattern>/fileupload</url-pattern>
    </servlet-mapping>