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jsp判断resultset是否为空

Java宅男 — Mon, 22 Mar 2010 13:24:00 GMT

1
2if(rs.isAfterLast()==rs.isBeforeFirst()){
3 out.print("您所查找的信息不存在�Q�请��认后再查找!");
4 }else{
5
6}

Java宅男 2010-03-22 21:24 发表评论

低调的apache fileUpload应用

Java宅男 — Wed, 23 Sep 2009 04:08:00 GMT

Apache FileUpload可以应用于很多方�?br /> 现将一应用贴出
FileUploadServlet.java

1 package Servlet;
2
3 import java.io.File;
4 import java.io.IOException;
5 import java.util.Iterator;
6 import java.util.List;
7
8 import javax.servlet.ServletException;
9 import javax.servlet.http.HttpServlet;
10 import javax.servlet.http.HttpServletRequest;
11 import javax.servlet.http.HttpServletResponse;
12
13 import org.apache.commons.fileupload.FileItem;
14 import org.apache.commons.fileupload.disk.DiskFileItemFactory;
15 import org.apache.commons.fileupload.servlet.ServletFileUpload;
16
17 @SuppressWarnings("serial")
18 public class FileUploadServlet extends HttpServlet {
19     private String uploadPath = "D:\\temp"; // 上传文�g的目�?/span>
20     private String tempPath = "d:\\temp\\buffer\\"; // 临时文�g目录
21     File tempPathFile;
22
23     @SuppressWarnings("unchecked")
24     public void doPost(HttpServletRequest request, HttpServletResponse response)
25            throws IOException, ServletException {
26        try {
27            // Create a factory for disk-based file items
28            DiskFileItemFactory factory = new DiskFileItemFactory();
29
30            // Set factory constraints
31            factory.setSizeThreshold(4096); // 讄��~�冲区大��，�q�里�?kb
32            factory.setRepository(tempPathFile);// 讄��~�冲区目�?br /> 33
34            // Create a new file upload handler
35            ServletFileUpload upload = new ServletFileUpload(factory);
36
37            // Set overall request size constraint
38            upload.setSizeMax(4194304); // 讄��最大文件尺寸，�q�里�?MB
39
40            List<FileItem> items = upload.parseRequest(request);// 得到所有的文�g
41            Iterator<FileItem> i = items.iterator();
42            while (i.hasNext()) {
43               FileItem fi = (FileItem) i.next();
44               String fileName = fi.getName();
45               if (fileName != null) {
46                   File fullFile = new File(fi.getName());
47                   File savedFile = new File(uploadPath, fullFile.getName());
48                   fi.write(savedFile);
49               }
50            }
51            System.out.print("upload succeed");
52        } catch (Exception e) {
53            // 可以跌��{出错��面
54            e.printStackTrace();
55        }
56     }
57
58     public void init() throws ServletException {
59        File uploadFile = new File(uploadPath);
60        if (!uploadFile.exists()) {
61            uploadFile.mkdirs();
62        }
63        File tempPathFile = new File(tempPath);
64         if (!tempPathFile.exists()) {
65            tempPathFile.mkdirs();
66        }
67     }
68 }

upload��面�Q?br />

1 <form name="myform" action="FileUpload" method="post" enctype="multipart/form-data">
2 File:<br>
3   <input type="file" name="myfile"><br>
4   <br>
5    <input type="submit" name="submit" value="Commit">
6 form>

一般来��_��要��用apache fileUpload�q�个插�g�Q�一般要导入两个jar�?br /> commons-fileupload-1.2.1.jar
commons-io-1.3.2.jar
如果�q�个io包没有导入貌��g��会报错�?br /> 点击下蝲�q�两个包的最新版�?br /> /Files/chenglu/java/FileUpLoad.zip

Java宅男 2009-09-23 12:08 发表评论

Java宅男 — Tue, 22 Sep 2009 06:52:00 GMT

一个不会报错的jsp彩色验证码程�?br /> 一般的�Q�会报servlet错误�Q?br /> getOutputStream() has already been called for this response
但是�q�个�E�序不会报错�Q�原因是把里面的�I�格都删�?br /> -------------------------------------------------------------
在tomcat中jsp�~�译成servlet之后在函数_jspService(HttpServletRequest request, HttpServletResponse response)的最�?br /> 有一�D�这��L��代码
finally {
if (_jspxFactory != null) _jspxFactory.releasePageContext(_jspx_page_context);
}
�q�里是在释放在jsp中��用的对象�Q�会调用response.getWriter(),因�ؓ�q�个�Ҏ��是和
response.getOutputStream()相冲�H�的�Q�所以会出现以上�q�个异常�?

然后当然是要提出解决的办法，其实挺简单的�Q��ƈ不是和某些朋友说的那�?-
��jsp内的所有空格和回�R�W�号所有都删除掉）�Q?/p>

在��用完输出��以后调用以下两行代码即可：
out.clear();
out = pageContext.pushBody();

--------------------------------------------------------
分割�U�内为引用～

1<%@ page import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %>
2<%@ page import="java.io.OutputStream" %>
3<%!
4Color getRandColor(int fc,int bc){
5Random random = new Random();
6if(fc>255) fc=255;
7if(bc>255) bc=255;
8int r=fc+random.nextInt(bc-fc);
9int g=fc+random.nextInt(bc-fc);
10int b=fc+random.nextInt(bc-fc);
11return new Color(r,g,b);
12}
13%>
14<%
15try{
16response.setHeader("Pragma","No-cache");
17response.setHeader("Cache-Control","no-cache");
18response.setDateHeader("Expires", 0);
19int width=60, height=20;
20BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
21OutputStream os=response.getOutputStream();
22Graphics g = image.getGraphics();
23Random random = new Random();
24g.setColor(getRandColor(200,250));
25g.fillRect(0, 0, width, height);
26
27g.setFont(new Font("Times New Roman",Font.PLAIN,18));
28g.setColor(getRandColor(160,200));
29for (int i=0;i<155;i++)
30{
31int x = random.nextInt(width);
32int y = random.nextInt(height);
33int xl = random.nextInt(12);
34int yl = random.nextInt(12);
35g.drawLine(x,y,x+xl,y+yl);
36}
37String sRand="";
38for (int i=0;i<4;i++){
39String rand=String.valueOf(random.nextInt(10));
40sRand+=rand;
41g.setColor(new Color(20+random.nextInt(110),20+random.nextInt(110),20+random.nextInt(110)));
42g.drawString(rand,13*i+6,16);
43}
44session.setAttribute("rand",sRand);
45g.dispose();
46
47ImageIO.write(image, "JPEG",os);
48os.flush();
49os.close();
50os=null;
51response.flushBuffer();
52out.clear();
53out = pageContext.pushBody();
54}
55catch(IllegalStateException e)
56{
57System.out.println(e.getMessage());
58e.printStackTrace();
59}%>
60

Java宅男 2009-09-22 14:52 发表评论

谁可以帮我一下？ewebeditor飞鱼修改版问题！

Java宅男 — Tue, 05 May 2009 11:13:00 GMT

文�g上传的时候，报错

1Status 500 -
2
3--------------------------------------------------------------------------------
4
5type Exception report
6
7message
8
9description The server encountered an internal error () that prevented it from fulfilling this request.
10
11exception
12
13org.apache.jasper.JasperException: An exception occurred processing JSP page /upload.jsp at line 302
14
15299:         if (!myFile.isMissing()) {
16300:             FileName=(String)date.Time_Stamp();
17301:             sOriginalFileName=myFile.getFileName();
18302:             myFile.saveAs("/"+sUploadDir+FileName+"."+myFile.getFileExt());
19303:             sSaveFileName=FileName+"."+myFile.getFileExt();
20304:             sPathFileName=sUploadDir+sSaveFileName;
21305:             System.out.println(sPathFileName);
22
23
24Stacktrace:
25    org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:505)
26    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:416)
27    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
28    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
29    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
30    sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source)
31    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
32    java.lang.reflect.Method.invoke(Method.java:597)
33    org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
34    java.security.AccessController.doPrivileged(Native Method)
35    javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
36    org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
37    org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)
38
39
40root cause
41
42java.security.AccessControlException: access denied (java.io.FilePermission \UploadFile read)
43    java.security.AccessControlContext.checkPermission(AccessControlContext.java:323)
44    java.security.AccessController.checkPermission(AccessController.java:546)
45    java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
46    java.lang.SecurityManager.checkRead(SecurityManager.java:871)
47    java.io.File.exists(File.java:731)
48    com.jspsmart.upload.SmartUpload.getPhysicalPath(SmartUpload.java:1067)
49    com.jspsmart.upload.File.saveAs(File.java:91)
50    com.jspsmart.upload.File.saveAs(File.java:65)
51    org.apache.jsp.upload_jsp._jspService(upload_jsp.java:376)
52    org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
53    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
54    org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
55    org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
56    org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
57    javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
58    sun.reflect.GeneratedMethodAccessor18.invoke(Unknown Source)
59    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
60    java.lang.reflect.Method.invoke(Method.java:597)
61    org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:244)
62    java.security.AccessController.doPrivileged(Native Method)
63    javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
64    org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:276)
65    org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:162)
66
67
68note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.
69
70
71--------------------------------------------------------------------------------
72
73Apache Tomcat/6.0.18

正常上传tomcat的提�C�是�Q?br /> gif|jpg|jpeg|bmp|GIF|JPG|JPEG|BMP500
UploadFile/20090505063838906.jpg
异常的时候是�Q?br /> gif|jpg|jpeg|bmp|GIF|JPG|JPEG|BMP500
UploadFile/
苦恼�?#8230;………

Java宅男 2009-05-05 19:13 发表评论

jsp-session

Java宅男 — Thu, 05 Mar 2009 07:47:00 GMT

session从第一个页面传到第二个

看代码：

1<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
2DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
3<html xmlns="http://www.w3.org/1999/xhtml">
4<head>
5<meta http-equiv="Content-Type" content="text/html; Charset=gb2312" />
6<title>无标题文�?/span>title>
7head>
8
9<body>
10<form action="" name="form1" method="post">
11  <p>地址�Q?br /> 12    <input type="text" name="useradd" />
13    <br>
14    <br>
15邮编�Q?br /> 16<input type="text" name="code" />
17  p>
18  <p>您的姓名�Q?br /> 19  <input type="text" name="username"/>p>
20  <p>
21    <input type="submit" value="保存" />
22    p>
23form>
24<%
25String useradd = request.getParameter("useradd");
26String code = request.getParameter("code");
27
28if(useradd!=null){
29String username = request.getParameter("username");
30session.setAttribute("csname",username);
31out.println("您填写的地址�?"+useradd);
32out.println("

");
33out.println("您填写的邮编�?"+code);
34out.println("

"check.jsp\">下一�?lt;/a>");
35}
36 %>
37
38body>
39html>
40

��面2�Q�check.jsp

1<%@ page contentType="text/html; charset=gb2312" language="java" %>
2DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
3<html xmlns="http://www.w3.org/1999/xhtml">
4<head>
5<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
6<title>无标题文�?/span>title>
7head>
8<body>
9<%
10String csname=(String)session.getAttribute("csname");
11out.println(csname);
12 %>
13
14body>
15html>
16

Java宅男 2009-03-05 15:47 发表评论

Java宅男 — Tue, 03 Mar 2009 03:30:00 GMT

first�Q?br /> index.html

1DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2<html xmlns="http://www.w3.org/1999/xhtml">
3<head>
4<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
5<title>首页title>
6head>
7
8<body>
9<form action="check.jsp" method="post">
10<p>输入您的用户�?br /> 11 <input type="text" name="username" />
12p>
13<p>输入您的密码�Q?br /> 14 <input name="pwd" type="password" value="" />
15p>
16<input type="submit" value="check it!" />
17form>
18body>
19html>
20

second:
check.jsp

result Page:
user Page:welcome.jsp

admin Page:

Java宅男 2009-03-03 11:30 发表评论

JSP---request�Ҏ��

Java宅男 — Thu, 26 Feb 2009 06:31:00 GMT

1<form name = "form1" method = "post" action = "doit.jsp">
2//所有的表单�E�序必须写在form表单�?/span>
3<input type = "checkbox" name = "color" value = "color"�U�色>
4<input type = "checkbox" name = "color" value = "green"�l�色>
5<input type = "checkbox" name = "color" value = "yellow"黄色>
6form>
7
8
9
10doit.jsp
11<%@ page contentType = "text/html";Charset = GBK; %>
12<%
13String color[] = request.getParameterValues("color");
14for(int i = 0;i<=color.length-1;i++){
15out.println("color"+color[i]+" ");
16}
17%>
18//request.getParameterValues("color")需要用数组来接�?nbsp;

Java宅男 2009-02-26 14:31 发表评论