ajax 留言本

今天抽空看了看Jquery,觉得里边的ajax封装得很好,就写了个简易的留言本。
这里写一下主要的几个文件,以备日后需要。源码下载

getComments.java putComments.java getComments.js putComments.js

 1 import java.io.IOException;
 2 import java.io.PrintWriter;
 3 import java.util.Iterator;
 4 
 5 import javax.servlet.ServletContext;
 6 import javax.servlet.ServletException;
 7 import javax.servlet.http.HttpServlet;
 8 import javax.servlet.http.HttpServletRequest;
 9 import javax.servlet.http.HttpServletResponse;
10 
11 import org.dom4j.Document;
12 import org.dom4j.DocumentException;
13 import org.dom4j.Element;
14 import org.dom4j.io.SAXReader;
15 
16 public class getComments extends HttpServlet {
17 
18     public void doGet(HttpServletRequest request, HttpServletResponse response)
19             throws ServletException, IOException {
20         String rootPath = request.getSession().getServletContext().getRealPath("");
21         response.setContentType("text/html;charset=gbk");
22         PrintWriter out = response.getWriter();
23         SAXReader reader = new SAXReader();
24         try {
25             //reader.read("/Comments.xml");
26             Document doc = reader.read(rootPath+"/Comments.xml");
27             Element root = doc.getRootElement();
28             Iterator itr = root.elementIterator();
29             while(itr.hasNext())
30             {
31                 Element elementc = (Element)itr.next();
32                 
33                 Iterator aItr = elementc.elementIterator();
34                 while(aItr.hasNext())
35                 {
36                     Element e = (Element)aItr.next();
37                     if(e.getName().equals("name"))
38                     {
39                         out.print("<p>"+e.getData()+"</p>");
40                     }
41                     if(e.getName().equals("content"))
42                     {
43                         out.print("<p class='date'>"+e.getData()+"</p>");
44                     }
45                 }
46             }
47         } catch (DocumentException e) {
48             e.printStackTrace();
49         }
50         out.flush();
51         out.close();
52     }
53 
54     public void doPost(HttpServletRequest request, HttpServletResponse response)
55             throws ServletException, IOException {
56         doGet(request, response);
57     }
58 
59 }
60 

 1 import java.io.IOException;
 2 import java.io.PrintWriter;
 3 
 4 import javax.servlet.ServletException;
 5 import javax.servlet.http.HttpServlet;
 6 import javax.servlet.http.HttpServletRequest;
 7 import javax.servlet.http.HttpServletResponse;
 8 
 9 import org.dom4j.Document;
10 import org.dom4j.DocumentException;
11 import org.dom4j.DocumentHelper;
12 import org.dom4j.Element;
13 import org.dom4j.io.OutputFormat;
14 import org.dom4j.io.SAXReader;
15 import org.dom4j.io.XMLResult;
16 import org.dom4j.io.XMLWriter;
17 
18 public class putComments extends HttpServlet {
19 
20     public void doGet(HttpServletRequest request, HttpServletResponse response)
21             throws ServletException, IOException {
22         request.setCharacterEncoding("UTF-8");
23         String rootPath = request.getSession().getServletContext().getRealPath("");
24             String name = request.getParameter("guestname");
25             String contents = request.getParameter("guestcontent");
26             Element comment = DocumentHelper.createElement("comment");
27             comment.addElement("name").setText(name);
28             comment.addElement("content").setText(contents);
29             
30             SAXReader reader = new SAXReader();
31             try {
32                 Document doc = reader.read(rootPath+"/Comments.xml");
33                 Element root = doc.getRootElement();
34                 root.add(comment);
35                 OutputFormat format = OutputFormat.createPrettyPrint();
36                 XMLResult result = new XMLResult(new java.io.FileOutputStream(rootPath+"/Comments.xml"),format);
37                 XMLWriter writer = result.getXMLWriter();
38                 doc.setXMLEncoding("GBK");
39                 writer.write(doc);
40             } catch (DocumentException e) {
41                 e.printStackTrace();
42             }
43     }
44 
45     public void doPost(HttpServletRequest request, HttpServletResponse response)
46             throws ServletException, IOException {
47 
48         doGet(request, response);
49     }
50 
51 }
52



 1 function getComments()
 2 {
 3     $.ajax({
 4         type:"post",
 5            url:"getComments",
 6            cache:false,
 7            dataType:"html",
 8            beforeSend: function(XMLHttpRequest){
 #liststatus< /span>"< span style="color: #000000;">).html(< span style="color: #000000;">"< span style="color: #000000;">正在读取留言,请稍等< img src="http://www.blogjava.net/Images/dot.gif" alt="" />");
10         },
11         success: function(data, textStatus){
12             $("#liststatus").hide("slow");
13             $("#commentslist").html(data);
14             //alert("finish");
15         },
16         complete: function(XMLHttpRequest, textStatus){
17             //alert("complete"+"\n textStatus:"+textStatus);
18         },
19         error: function(){
 & nbsp;         $(#liststatus< /span>"< span style="color: #000000;">).html(< span style="color: #000000;">"< span style="color: #000000;">读取留言时发生错误.< span style="color: #000000;">");
21         }
22            
23            
24            });
25     
26     }

 1 function putComments()
 2 {
 3     $.ajax({
 4            type:"post",
 5            url:"putComments",
 6            dataType:"html",
 7            cache:"false",
 8            data:"guestname="+$("#guestname").val()+"&guestcontent="+$("#guestcontent").val(),
 9            beforeSend: function(XMLHttpRequest){
10             $("#status").html("正在提交留言,请稍候");
11             $("#form").hide("slow");
12         },
13         success: function(data, textStatus){
14             $("#status").html("留言提交成功!");
15             $("#form").show("slow");
16             getComments();
17         },
18         complete: function(XMLHttpRequest, textStatus){
19             //alert("complete"+"\n textStatus:"+textStatus);
20         },
21         error: function(){
22             $("#status").html("提交留言时出现错误!");
23             $("#form").show("slow");
24         }
25            });
26     }



我的信息网名:Elephant

posted on 2009-02-28 19:54 Enzosoft 阅读(283) 评论(1)  编辑  收藏 所属分类: Java

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# re: ajax 留言本 2010-06-18 11:26 lacewigs

Not sure I agree entirely, but I have to say that I find the commentary insightful.  回复  更多评论   


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