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在spring的bean中获取ServletContext �?servletConfig

紫蝶∏飛揚↗ — Sat, 18 Jun 2011 01:44:00 GMT

在spring的bean中获取ServletContext �?nbsp;servletConfig

常规方式下获取servletContext需要��承HttpServlet�c�，然后获取servletConfig�Q�通过�q�个获取servletContext�Q�servletConfig.getServletContext()�Q��?/div>

但是spring的bean都是pojo�Q�和我们常规的操作有些不同�?/div>

spring�l�我们提供了两个接口�Q�org.springframework.web.context.ServletContextAware和org.springframework.web.context.ServletConfigAware。我们可以让我们的bean实现上边的�Q何一个接口就能获取到servletContext�?.

代码如下�Q?/div>

public class DicBean implements ServletContextAware{

private ServletContext servletContext;

public void setServletContext(ServletContext sc) {
    this.servletContext=sc;
    System.out.println("��目应用的绝对�\径�ؓ�Q?/span>"+servletContext.getRealPath("/"));
}
}

紫蝶∏飛揚↗ 2011-06-18 09:44 发表评论

DOM4J 知识详解

紫蝶∏飛揚↗ — Tue, 23 Nov 2010 03:35:00 GMT

一.Document对象,三种创徏�Ҏ��

1.��d��XML文�g,获得document对象.
SAXReader reader = new SAXReader();
Document document = reader.read(new File("input.xml"));

2.解析XML格式的字�W�串,获得document对象.
            String text = "";
            Document document = DocumentHelper.parseText(text);
3.创徏document�I�对�?/span>.
            Document document = DocumentHelper.createDocument();
            Element root = document.addElement("members");// 创徏根节�?只有�I�DOCUMENT对象才能创徏ROOT�l�点

�?节点控制

1.获取文��?span style="color: #99cc00">根节�?/span>.
           Element root = document.getRootElement();
2.取得节点的文�?br />            String text=memberElm.getText();
也可以用�Q?br />            String text=root.elementText("name");   //�q�个是取得根节点下的name字节点的文字;可以�c�L��M��节点下的文本
3.讄��节点文字.
           ageElm.setText("29");
4.父节点下获得单个子节点对�?/span>.
           Element memberElm=root.element("member"); // "member"是节点名

5.取得父节点下遍历名�ؓ"member"的所有子节点.
           List nodes = rootElm.elements("member");
           for (Iterator it = nodes.iterator(); it.hasNext();) {
                 Element elm = (Element) it.next();
                 // do something
            }
6.父节点下�?span style="color: #99cc00">遍历所有子节点�q�行.
            for(Iterator it=root.elementIterator();it.hasNext();){
                Element element = (Element) it.next();
                // do something
            }
7.父节点下��d��子节�?/span>.
           Element ageElm = newMemberElm.addElement("age");

8.父节点下删除子节�?/span>.
           parentElm.remove(childElm);// childElm是待删除的节�?parentElm是其父节�?br />
�?属性相�?
1.取得某节点下的某属�?br />             Element root=document.getRootElement();
            Attribute attribute=root.attribute("size");// 属性名name
2.取得属性的文字
            String text=attribute.getText();
也可以用:
String text2=root.element("name").attributeValue("firstname");�q�个是取得根节点下name字节点的属性firstname的�?

3.遍历某节点的所有属�?br />             Element root=document.getRootElement();
            for(Iterator it=root.attributeIterator();it.hasNext();){
                Attribute attribute = (Attribute) it.next();
                String text=attribute.getText();
                System.out.println(text);
            }
4.讄��某节点的属性和文字.
newMemberElm.addAttribute("name", "sitinspring");
5.讄��属性的文字
            Attribute attribute=root.attribute("name");
            attribute.setText("sitinspring");
6.删除某属�?br />             Attribute attribute=root.attribute("size");// 属性名name
            root.remove(attribute);
�?��文��写入XML文�g.
1.文��中全��?不设�|�编�?直接写入的�Ş�?
XMLWriter writer = new XMLWriter(new FileWriter("output.xml"));
writer.write(document);
writer.close();
2.文��中含有中�?讄��~�码格式写入的�Ş�?
            OutputFormat format = OutputFormat.createPrettyPrint();
            format.setEncoding("GBK");    // 指定XML�~�码
            XMLWriter writer = new XMLWriter(new FileWriter("output.xml"),format);

            writer.write(document);
            writer.close();
�?字符串与XML的�{�?br /> 1.��字�W�串转化为XML
String text = " sitinspring ";
Document document = DocumentHelper.parseText(text);
2.��文��或节点的XML转化为字�W�串.
            SAXReader reader = new SAXReader();
            Document document = reader.read(new File("input.xml"));
            Element root=document.getRootElement();
            String docXmlText=document.asXML();
            String rootXmlText=root.asXML();
            Element memberElm=root.element("member");
            String memberXmlText=memberElm.asXML();
�?使用XPath快速找到节�?
��d��的XML文��C�Z��

MemberManagement

    PRJ1
    PRJ2
    PRJ3
    PRJ4


      org.eclipse.jdt.core.javabuilder




    org.eclipse.jdt.core.javanature

使用XPath快速找到节点project.
public static void main(String[] args){
    SAXReader reader = new SAXReader();

    try{
      Document doc = reader.read(new File("sample.xml"));

      List projects=doc.selectNodes("/projectDescription/projects/project");
     //Element nodes0=xmlDoc.selectSingleNode("/bookstore"); //采用相对路径,卛_��前结�?包括当前�l�点)开始查�?与下列结果相�?
     //Element nodes=nodes0.selectNodes("book");      ////采用�l�对路径,卛_��前结�?包括当前�l�点)开始查�?
     //XPATH语法详见: http://www.w3school.com.cn/xpath/xpath_syntax.asp

      Iterator it=projects.iterator();

      while(it.hasNext()){
        Element elm=(Element)it.next();
        System.out.println(elm.getText());
      }

    }
    catch(Exception ex){
       ex.printStackTrace();
    }
}

紫蝶∏飛揚↗ 2010-11-23 11:35 发表评论

JS函数验证日期合法(��试通过)

紫蝶∏飛揚↗ — Wed, 20 Oct 2010 05:38:00 GMT

紫蝶∏飛揚↗ 2010-10-20 13:38 发表评论

紫蝶∏飛揚↗ — Tue, 28 Sep 2010 07:34:00 GMT

EOS提供�?lt;l:iterator/>标签�Q�可以对数组集合�q�行�q�代�?br /> iterate标签的实现原理是�Ҏ��l�或集合�q�行�q�代�Q�每�ơ把子元素放在page数据区指定的节点下。这个节点名�U�由iterate标签的id

属性来指定�?br /> <%= ((DataObject)pageContext.getAttribute("id1")).getString("paramDictname") %>

紫蝶∏飛揚↗ 2010-09-28 15:34 发表评论

JS控制的页面回退

紫蝶∏飛揚↗ — Mon, 27 Sep 2010 02:11:00 GMT

JS�q�回函数
onclick="javascript:history.go(-1);"

紫蝶∏飛揚↗ 2010-09-27 10:11 发表评论

JSP常用的取相对路径

紫蝶∏飛揚↗ — Mon, 27 Sep 2010 02:10:00 GMT

相对路径
http://127.0.0.1:8090/eos-default/dataset/taskdistribute/taskdistribute.jsp
var str="<%=request.getContextPath()%>"+"/dataset/taskdistribute/taskdistribute.jsp";

紫蝶∏飛揚↗ 2010-09-27 10:10 发表评论

紫蝶∏飛揚↗ — Fri, 30 Apr 2010 01:22:00 GMT

在focus事�g里保存初�?change事�g里进行新��g��旧值的比较
.......

.......

紫蝶∏飛揚↗ 2010-04-30 09:22 发表评论

紫蝶∏飛揚↗ — Thu, 29 Apr 2010 09:46:00 GMT

employeeWageList" indexId="index"> //也可以用jstl c:标签
modifyEmployeeWageList[index].employeeWageMoney }" /> �?br />

有时��目中两个同�c�d��的对象需要传值给界面比对,此时��q��C��.主要技术就是EL表达式可以直接取for的参数�?要相信一�?JSP也好,标签也好.都要转化为SERVLET�c?也就是一个JAVA�c?所以定义的属性或�Ҏ��都可以通用�?EL寚w��合的取法[],对于LIST�{�都通用.

紫蝶∏飛揚↗ 2010-04-29 17:46 发表评论

[转]Jsp中实现文件上传与下蝲

紫蝶∏飛揚↗ — Sun, 03 Jan 2010 08:54:00 GMT

Jsp中实现文件上传与下蝲

1�Q�客��L��上传文�g
客户端通过一个Jsp��面�Q�上传文件到服务器，该Jsp��面必须含有File�c�表单，�q�且表单必须讄��enctype="multipart/form- data"。提交表单时通过内置对象request�Q�request.getInputStream();�Ҏ��获得一个输入流�?br /> 在上传文件时�Q�会有附加信息，如下所�C�：

-----------------------------7d71042a40328
Content-Disposition: form-data; name="fileforload"; filename="C:"Documents and Settings"ZJ"桌面"book.txt"
Content-Type: text/plain
//此处为文件内�?br /> -----------------------------7d71042a40328
Content-Disposition: form-data; name="submit"

commit
-----------------------------7d71042a40328--

附加信息大小�?97字节�Q�不��定�q�个��|��试得到�Q�，可通过request.getContentLength()>297来判断是否上传了文�g�q�是提交�I�字�W�串�?/span>

2�Q�测�?/span>
fileupload.jsp负责提交文�g�Q�accept.jsp负责实现上传功能�?br /> fileupload.jsp

This page for FileUpload

Choose the file for uploading:

accept.jsp

This page for response

<%try{
if(request.getContentLength()>297){
   InputStream in=request.getInputStream();
   File f=new File("d:/temp","test.txt");
   FileOutputStream o=new FileOutputStream(f);
   byte b[]=new byte[1024];
   int n;
   while((n=in.read(b))!=-1){
  o.write(b,0,n);
   }
   o.close();
   in.close();
   out.print("File upload success!");
}
else{
  out.print("No file!");
}
}
catch(IOException e){
out.print("upload error.");
e.printStackTrace();
}
%>

服务器端得到的上传文件I like.txt�Q�取名�ؓtest.txt

-----------------------------7d75b1540328
Content-Disposition: form-data; name="fileforload"; filename="C:"Documents and Settings"ZJ"桌面"I like.txt"
Content-Type: text/plain

我喜�Ƣ驾驭着代码在风驰电掣中创造完��?
我喜�Ƣ操�U늝�代码在随心所�Ʋ中体验生活;
我喜�Ƣ用心情代码�~�制我小��的与众不同;
每一�D�|��的代码在我手中�g生对我来说就象观看刹那花开的感�?
我不需要焦�?因�ؓ我就是焦�?

-----------------------------7d75b1540328
Content-Disposition: form-data; name="submit"

commit
-----------------------------7d75b1540328--

3�Q�去除附加信�?/span>
按照HTTP协议�Q�文件表单提交的信息中，�?�?不��的自动空�?和后5行是表单本��n的信息，中间部分才是上传的文件的内容。下例对上传的文件进行处理，获取文�g名，�q�去除附加信息�?/span>

4�Q�测�?/span>
fileupload.jsp不变�Q?u>accept.jsp修改如下�Q?/span>

The real file

<%try{
//use sessionid to create a temp file.
String tempFileName=(String)session.getId();
//create the temp file.
File temp=new File("d:/temp",tempFileName);
FileOutputStream o=new FileOutputStream(temp);
if(request.getContentLength()>297){
   //write the upload content to the temp file.
   InputStream in=request.getInputStream();
   byte b[]=new byte[1024];
   int n;
   while((n=in.read(b))!=-1){
    o.write(b,0,n);
   }
   o.close();
   in.close();
   //read the temp file.
   RandomAccessFile random=new RandomAccessFile(temp,"r");
   //read Line2 to find the name of the upload file.
   int second=1;
   String secondLine=null;
   while(second<=2){
    secondLine=random.readLine();
    second++;
   }
   //get the last location of the dir char.'""'.
   int position=secondLine.lastIndexOf('""');
   //get the name of the upload file.
   String fileName=secondLine.substring(position+1,secondLine.length()-1);
   //relocate to the head of file.
   random.seek(0);
   //get the location of the char.'Enter' in Line4.
   long forthEndPosition=0;
   int forth=1;
   while((n=random.readByte())!=-1&&(forth<=4)){
    if(n=='"n'){
     forthEndPosition=random.getFilePointer();
     forth++;
    }
   }
   File realFile=new File("d:/temp",fileName);
   RandomAccessFile random2=new RandomAccessFile(realFile,"rw");
   //locate the end position of the content.Count backwards 6 lines.
   random.seek(random.length());
   long endPosition=random.getFilePointer();
   long mark=endPosition;
   int j=1;
   while((mark>=0)&&(j<=6)){
    mark--;
    random.seek(mark);
    n=random.readByte();
    if(n=='"n'){
     endPosition=random.getFilePointer();
     j++;
    }
   }
   //locate to the begin of content.Count for 4 lines's end position.
   random.seek(forthEndPosition);
   long startPoint=random.getFilePointer();
   //read the real content and write it to the realFile.
   while(startPoint     n=random.readByte();
    random2.write(n);
    startPoint=random.getFilePointer();
   }
   random2.close();
   random.close();
   //delete the temp file.
   temp.delete();
   out.print("File upload success!");
}
else{
  out.print("No file!");
}
}
catch(IOException e){
out.print("upload error.");
e.printStackTrace();
}
%>

�Q�注�Q�如果文件名是中文，会出��Cؕ码。）

5�Q�文件下�?/span>
Jsp内置对象response调用�Ҏ��getOutputStream�Q�）可以获取一个指向客��L��输出��，服务器将文�g写入�q�个��，然后可下载此文�g�?/span>

6�Q�测�?/span>
download.jsp昄��下蝲选项�Q�LoadFile.java�Q�Servlet�Q�负责下载文件�?br /> download.jsp

download page

Download:test.zip

LoadFile.java

package com.zj.sample;

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@SuppressWarnings("serial")
public class LoadFile extends HttpServlet{
public void doGet(HttpServletRequest request,HttpServletResponse response)
   throws IOException,ServletException{
    OutputStream o=response.getOutputStream();
    byte b[]=new byte[1024];
    //the file to download.
    File fileLoad=new File("d:/temp","test.rar");
    //the dialogbox of download file.
    response.setHeader("Content-disposition",
      "attachment;filename="+"test.rar");
    //set the MIME type.
    response.setContentType("application/x-tar");
    //get the file length.
    long fileLength=fileLoad.length();
    String length=String.valueOf(fileLength);
    response.setHeader("Content_Length",length);
    //download the file.
    FileInputStream in=new FileInputStream(fileLoad);
    int n=0;
    while((n=in.read(b))!=-1){
     o.write(b,0,n);
    }
}
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws IOException,ServletException{
  doGet(request,response);
}

}

web.xml�Q�注册servlet�Q?/span>

LoadFileServlet
com.zj.sample.LoadFile

LoadFileServlet
/loadFile

转自�Q�－http://blog.csdn.net/lookthesea/archive/2007/05/20/1617633.aspx

紫蝶∏飛揚↗ 2010-01-03 16:54 发表评论