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瓜瓜 2010-03-22 21:39 å‘表评论
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<body>
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%>
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************2.page指ä×o************************
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1 <%@ page language="java" import="java.util.*" pageEncoding="GB18030"%>
2 <%@ page import="java.sql.*" %>
3 <%
4 String path = request.getContextPath();
5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
6 %>
7
8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
9 <html>
10 <head>
11 <base href="<%=basePath%>">
12 </head>
21 <body>
22 <%!
23 public static final String driver="com.mysql.jdbc.Driver";
24 public static final String dburl="jdbc:mysql://localhost:3306/bbs";
25 public static final String username="root";
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27 %>
28
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40 %>
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47 </tr>
48 <%
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53
54 %>
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58 <td><%=pass %></td>
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60 <%} %>
61 <%
62 rs.close();
63 pst.close();
64 conn.close();
65 %>
66 </table>
67 </center>
68 </body>
69 </html>
70
2 <%@ page import="java.sql.*" %>
3 <%
4 String path = request.getContextPath();
5 String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
6 %>
7
8 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
9 <html>
10 <head>
11 <base href="<%=basePath%>">
12 </head>
21 <body>
22 <%!
23 public static final String driver="com.mysql.jdbc.Driver";
24 public static final String dburl="jdbc:mysql://localhost:3306/bbs";
25 public static final String username="root";
26 public static final String password="wszf";
27 %>
28
29 <%
30 Connection conn=null;//æ•°æ®åº“è¿žæŽ?/span>
31 PreparedStatement pst=null;//æ•°æ®åº“æ“ä½?/span>
32 ResultSet rs=null;//¾l“æžœé›?/span>
33 %>
34 <%
35 Class.forName(driver).newInstance();// åŠ è²æ•°æ®åº“驱åŠ?/span>
36 conn=DriverManager.getConnection(dburl,username,password);
37 String sql="select id,username,password from user_tb";
38 pst=conn.prepareStatement(sql);
39 rs=pst.executeQuery();
40 %>
41 <center>
42 <table border="1" width="20%" bordercolor="#aaa">
43 <tr>
44 <td>id</td>
45 <td>姓å</td>
46 <td>密ç </td>
47 </tr>
48 <%
49 while(rs.next()){
50 int id=rs.getInt(1);
51 String name=rs.getString(2);
52 String pass=rs.getString(3);
53
54 %>
55 <tr>
56 <td><%=id %></td>
57 <td><%=name %></td>
58 <td><%=pass %></td>
59 </tr>
60 <%} %>
61 <%
62 rs.close();
63 pst.close();
64 conn.close();
65 %>
66 </table>
67 </center>
68 </body>
69 </html>
70
瓜瓜 2010-03-16 20:03 å‘表评论
]]>瓜瓜 2010-01-17 10:45 å‘表评论
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java.lang.StackOverflowError
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java.lang.Exception
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java.lang.IllegalAccessException
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java.lang.IllegalMonitorStateException
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java.lang.IllegalStateException
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java.lang.IllegalThreadStateException
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java.lang.IndexOutOfBoundsException
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java.lang.InstantiationException
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java.lang.InterruptedException
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java.lang.NegativeArraySizeException
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java.lang.NoSuchFieldException
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java.lang.NoSuchMethodException
æ–ÒŽ(gu¨©)³•ä¸å˜åœ¨å¼‚常。当讉K—®æŸä¸ª¾cÈš„ä¸å˜åœ¨çš„æ–ÒŽ(gu¨©)³•æ—¶æŠ›å‡ø™¯¥å¼‚常ã€?br />
java.lang.NullPointerException
½IºæŒ‡é’ˆå¼‚常。当应用试图在è¦æ±‚ä‹É用对象的地方使用了nullæ—Óž¼ŒæŠ›å‡ºè¯¥å¼‚常。è¬å¦‚：调用null对象的实例方法ã€è®¿é—®null对象的属性ã€è®¡½Ž—null对象的长度ã€ä‹É用throwè¯å¥æŠ›å‡ºnull½{‰ç‰ã€?br />
java.lang.NumberFormatException
æ•°å—æ ¼å¼å¼‚常。当试图ž®†ä¸€ä¸ªString转æ¢ä¸ºæŒ‡å®šçš„æ•°å—¾cÕdž‹åQŒè€Œè¯¥å—符串确ä¸æ»¡‘Ïx•°å—类型è¦æ±‚çš„æ ¼å¼æ—Óž¼ŒæŠ›å‡ºè¯¥å¼‚常ã€?br />
java.lang.RuntimeException
˜q行时异常。是所有Java虚拟机æ£å¸¸æ“作期间å¯ä»¥è¢«æŠ›å‡ºçš„异常的父类ã€?br />
java.lang.SecurityException
安全异常。由安全½Ž¡ç†å™¨æŠ›å‡ºï¼Œç”¨äºŽæŒ‡ç¤º˜qå安全情况的异常ã€?br />
java.lang.StringIndexOutOfBoundsException
å—符串烦引越界异常。当使用索引å€ÆD®¿é—®æŸä¸ªå—½W¦ä¸²ä¸çš„å—符åQŒè€Œè¯¥ç´¢å¼•å€¼å°äº?或大于ç‰äºŽåºåˆ—大ž®æ—¶åQŒæŠ›å‡ø™¯¥å¼‚常ã€?br />
java.lang.TypeNotPresentException
¾cÕdž‹ä¸å˜åœ¨å¼‚常。当应用试图以æŸä¸ªç±»åž‹å¿U°çš„å—符串表达方å¼è®¿é—®è¯¥¾cÕdž‹åQŒä½†æ˜¯æ ¹æ®ç»™å®šçš„å称åˆæ‰¾ä¸åˆ°è¯¥ç±»åž‹æ˜¯æŠ›å‡ºè¯¥å¼‚常。该异常与ClassNotFoundException的区别在于该异常是uncheckedåQˆä¸è¢«æ£€æŸ¥ï¼‰å¼‚常åQŒè€ŒClassNotFoundException是checkedåQˆè¢«‹‚€æŸ¥ï¼‰å¼‚常ã€?br />
java.lang.UnsupportedOperationException
ä¸æ”¯æŒçš„æ–ÒŽ(gu¨©)³•å¼‚常。指明请求的æ–ÒŽ(gu¨©)³•ä¸è¢«æ”¯æŒæƒ…况的异常ã€?br />
异常
javax.servlet.jsp.JspException: Cannot retrieve mapping for action /Login åQ?/span>/Loginæ˜¯ä½ çš„actionåå—åQ?br />
å¯èƒ½åŽŸå›
action没有å†struts-config.xml ä¸å®šä¹‰ï¼Œæˆ–没有找到匹é…çš„actionåQŒä¾‹å¦‚在JSPæ–‡äšgä¸ä‹Éç”?nbsp;<html:form action="Login.do".ž®†è¡¨å•æ交给Login.do处ç†åQŒå¦‚果出çŽîC¸Š˜q°å¼‚常，è¯ähŸ¥çœ‹struts-config.xmlä¸çš„定义部分åQŒæœ‰æ—¶å¯èƒ½æ˜¯æ‰“错了嗽W¦æˆ–者是æŸäº›ä¸ç¬¦åˆè§„则，å¯ä»¥ä½¿ç”¨strutsconsole工具æ¥æ£€æŸ¥ã€?br /> -----------------------------------------------------------------------------------------------------------------
异常
org.apache.jasper.JasperException: Cannot retrieve definition for form bean null
å¯èƒ½åŽŸå›
˜q™ä¸ªå¼‚å¸¸æ˜¯å› ä¸ºStrutsæ ÒŽ(gu¨©)®struts-config.xmlä¸çš„mapping没有扑ֈ°action期望的form bean。大部分的情况å¯èƒ½æ˜¯å› äؓ在form-beanä¸è®¾¾|®çš„name属性和actionä¸è®¾¾|®çš„name属性ä¸åŒšw…所致。æ¢å¥è¯è¯ß_¼Œactionå’Œform都应该å„自有一个name属性，òq¶ä¸”è¦ç²¾¼‹®åŒ¹é…，包括大å°å†™ã€‚这个错误当没有name属性和actionå…Œ™”时也会å‘生，如果没有在actionä¸æŒ‡å®šname属性，那么ž®±æ²¡æœ‰name属性和action相关è”。当然当action制作æŸäº›æŽ§åˆ¶æ—Óž¼Œè¬å¦‚æ ÒŽ(gu¨©)®å‚æ•°å€ÆDŸ©è½¬åˆ°ç›¸åº”çš„jsp™åµé¢åQŒè€Œä¸æ˜¯å¤„ç†è¡¨å•æ•°æ®ï¼Œ˜q™æ˜¯ž®×ƒ¸ç”¨name属性，˜q™ä¹Ÿæ˜¯actionçš„ä‹É用方法之一ã€?br /> -----------------------------------------------------------------------------------------------------------------
异常
No action instance for path /xxxx could be created
å¯èƒ½åŽŸå›
特别æ示åQšå› 为有很多ä¸æƒ…况会å¯ÆD‡´˜q™ä¸ªé”™è¯¯çš„å‘生，所以推èå¤§å®¶è°ƒé«˜ä½ çš„webæœåŠ¡å™¨çš„日志/调试¾U§åˆ«åQŒè¿™æ ·å¯ä»¥ä»Žæ›´å¤šçš„ä¿¡æ¯ä¸çœ‹åˆ°æ½œåœ¨çš„ã€åœ¨è¯•å›¾åˆ›å¾action¾cÀL—¶å‘生的错误，˜q™ä¸ªaction¾cÖM½ å·²ç»åœ¨struts-config.xmlä¸è®¾¾|®äº†å…Œ™”åQˆå³æ·ÕdŠ äº?/span><action>æ ‡ç¾åQ‰ã€?br />
在struts-config.xmlä¸é€šè¿‡actionæ ‡ç¾çš„class属性指定的action¾cÖM¸èƒ½è¢«æ‰‘Öˆ°æœ‰å¾ˆå¤šç§åŽŸå› åQŒä¾‹å¦‚：定佾~–译åŽçš„.classæ–‡äšgå¤ÞpÓ|。Failure to place compiled .class file for the action in the classpath (在webå¼€å‘ä¸åQŒclassçš„çš„ä½ç½®åœ¨r WEB-INF/classesåQŒæ‰€ä»¥ä½ çš„action classå¿…é¡»è¦åœ¨˜q™ä¸ªç›®å½•ä¸‹ã€‚ä¾‹å¦‚ä½ çš„action¾cÖM½äºŽWEB-INF/classes/action/Login.class,那么在struts-config.xmlä¸è®¾¾|®a(ch¨£n)ction的属性type时就是action.Login).
拼写错误åQŒè¿™ä¸ªä¹Ÿæ—¶æœ‰å‘生åQŒåƈ且ä¸æ˜“找刎ͼŒç‰¹åˆ«æ³¨æ„½W¬ä¸€ä¸ªå—æ¯çš„大å°å†™å’ŒåŒ…çš„å称ã€?nbsp;
-----------------------------------------------------------------------------------------------------------------
异常
javax.servlet.jsp.JspException: No getter method for property username of bean org.apache.struts.taglib.html.BEAN
å¯èƒ½åŽŸå›
没有ä½form beanä¸çš„æŸä¸ªå˜é‡å®šä¹‰getter æ–ÒŽ(gu¨©)³•
˜q™ä¸ªé”™è¯¯ä¸»è¦å‘生在表å•æ交的FormBeanä¸ï¼Œç”¨strutsæ ‡è®°<html:text property=”username”>æ—Óž¼Œåœ¨FormBeanä¸å¿…™åÀLœ‰ä¸€ä¸ªgetUsername()æ–ÒŽ(gu¨©)³•ã€‚注æ„å—æ¯?#8220;U”ã€?br /> -----------------------------------------------------------------------------------------------------------------
异常
java.lang.NoClassDefFoundError: org/apache/struts/action/ActionForm
å¯èƒ½åŽŸå›
˜q™ä¸ªé”™è¯¯ä¸»è¦å‘生在在classpathä¸æ‰¾ä¸åˆ°ç›¸åº”çš„Java .classæ–‡äšg。如果这个错误å‘生在web应用½E‹åºçš„è¿è¡Œæ—¶åQŒä¸»è¦æ˜¯å› äؓ指定的classæ–‡äšgä¸åœ¨web serverçš„classpathä¸ï¼ˆ/WEB-INF/classes å’?nbsp;/WEB-INF/libåQ‰ã€‚在上é¢çš„错误ä¸åQŒåŽŸå› 是找ä¸åˆ°ActionForm¾c…R€?br /> -----------------------------------------------------------------------------------------------------------------
异常
javax.servlet.jsp.JspException: Exception creating bean of class org.apache.struts.action.ActionForm: {1}
å¯èƒ½åŽŸå›
Instantiating Struts-provided ActionForm class directly instead of instantiating a class derived off ActionForm. This mightoccur implicitly if you specify that a form-bean is this Struts ActionForm class rather than specifying a child of this classfor the form-bean.
Not associating an ActionForm-descended class with an action can also lead to this error.
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异常
javax.servlet.jsp.JspException: Cannot find ActionMappings or ActionFormBeans collection
å¯èƒ½åŽŸå›
ä¸æ˜¯æ ‡è¯†Struts actionServletçš?/span><servlet>æ ‡è®°ž®±æ˜¯æ˜ å°„.do扩展åçš„<sevlet-mapping>æ ‡è®°æˆ–è€…ä¸¤è€…éƒ½æ²¡æœ‰åœ¨web.xmlä¸å£°æ˜Žã€?br />
在struts-config.xmlä¸çš„打å—或者拼写错误也å¯å¯¼è‡´è¿™ä¸ªå¼‚常的å‘生。例如缺ž®‘ä¸€ä¸ªæ ‡è®°çš„å…³é—½W¦å·/>。最好ä‹É用struts console工具‹‚€æŸ¥ä¸€ä¸‹ã€?br />
å¦å¤–åQŒload-on-startup必须在web.xmlä¸å£°æ˜Žï¼Œ˜q™è¦ä¹ˆæ˜¯ä¸€ä¸ªç©ºæ ‡è®°åQŒè¦ä¹ˆæŒ‡å®šä¸€ä¸ªæ•°å€û|¼Œ˜q™ä¸ªæ•°å€¼ç”¨æ¥è¡¨servlet˜q行的优先çñ”åQŒæ•°å€ÆD¶Šå¤§ä¼˜å…ˆçñ”‘Šä½Žã€?br />
˜q˜æœ‰ä¸€ä¸ªå’Œä½¿ç”¨load-on-startup有关的是使用Struts预编译JSPæ–‡äšg时也å¯èƒ½å¯ÆD‡´˜q™ä¸ªå¼‚常ã€?br /> -----------------------------------------------------------------------------------------------------------------
异常
java.lang.NullPointerException at org.apache.struts.util.RequestUtils.forwardURL(RequestUtils.java:1223)
å¯èƒ½åŽŸå›
在struts-config.xmlä¸çš„forwardå…ƒç´ ¾~ºå°‘path属性。例如应该是如下形å¼åQ?br /> <forward name="userhome" path="/user/userhome.jsp"/>
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异常
javax.servlet.jsp.JspException: Cannot find bean org.apache.struts.taglib.html.BEAN in any scope
Probable Causes
试图在Strutsçš„formæ ‡è®°å¤–ä‹É用formçš„åå…ƒç´ ã€‚è¿™å¸¸å¸¸å‘ç”Ÿåœ¨ä½ åœ?/span></html:form>åŽé¢ä½¿ç”¨Strutsçš„htmlæ ‡è®°ã€‚å¦å¤–è¦æ³¨æ„å¯èƒ½ä½ 举læ„ä½¿ç”¨çš„æ— ä¸ÖM½“çš„æ ‡è®ŽÍ¼Œå¦?/span><html:form … />åQŒè¿™æ ·web æœåŠ¡å™¨è§£æžæ—¶ž®±å½“ä½œä¸€ä¸ªæ— ä¸ÖM½“çš„æ ‡è®ŽÍ¼ŒéšåŽä½¿ç”¨çš„所æœ?/span><html>æ ‡è®°éƒ½è¢«è®¤äؓ是在˜q™ä¸ªæ ‡è®°ä¹‹å¤–的，如åˆä½¿ç”¨äº?/span><html:text property=”id”>˜q˜æœ‰ž®±æ˜¯åœ¨ä‹É用taglib引入HTMLæ ‡è®°åº“æ—¶åQŒä½ 使用的prefixçš„å€ég¸æ˜¯htmlã€?br /> -----------------------------------------------------------------------------------------------------------------
异常
javax.servlet.jsp.JspException: Missing message for key xx.xx.xx
Probable Causes
˜q™ä¸ªkey的值对没有在资æºæ–‡ä»¶ApplicationResources.propertiesä¸å®šä¹‰ã€‚å¦‚æžœä½ ä½¿ç”¨eclipseæ—¶ç»å¸¸ç¢°åˆ°è¿™æ ïL(f¨¥ng)š„情况åQŒå½“™å¹ç›®é‡æ–°¾~–译æ—Óž¼Œeclipse会自动将classes目录下的资æºæ–‡äšgåˆ é™¤ã€?br />
资æºæ–‡äšgApplicationResources.properties ä¸åœ¨classpathä¸åº”ž®†èµ„æºæ–‡ä»¶æ”¾åˆ?nbsp;WEB-INF/classes 目录下，当然è¦åœ¨struts-config.xmlä¸å®šä¹?
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异常
Cannot find message resources under key org.apache.struts.action.MESSAGE
å¯èƒ½åŽŸå›
很显ç„Óž¼Œ˜q™ä¸ªé”™è¯¯æ˜¯å‘生在使用资æºæ–‡äšgæ—Óž¼Œè€ŒStruts没有扑ֈ°èµ„æºæ–‡äšgã€?br />
Implicitly trying to use message resources that are not available (such as using empty html:options tag instead of specifyingthe options in its body -- this assumes options are specified in ApplicationResources.properties file)
XML parser issues -- too many, too few, incorrect/incompatible versions
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异常
Strange and seemingly random characters in HTML and on screen, but not in original JSP or servlet.
å¯èƒ½åŽŸå›
混和使用Strutsçš„html:formæ ‡è®°å’Œæ ‡å‡†çš„HTMLæ ‡è®°ä¸æ£¼‹®ã€?br />
使用的编ç æ ·å¼åœ¨æœ¬é¡µä¸ä¸æ”¯æŒã€?br /> -----------------------------------------------------------------------------------------------------------------
异常
"Document contained no data" in Netscape
No data rendered (completely empty) page in Microsoft Internet Explorer
å¯èƒ½åŽŸå›
使用一个Action的派生类而没有实现perform()æ–ÒŽ(gu¨©)³•æˆ–execute()æ–ÒŽ(gu¨©)³•ã€‚在Struts1.0ä¸å®žçŽ°çš„是perform()æ–ÒŽ(gu¨©)³•åQŒåœ¨Struts1.1ä¸å®žçŽ°çš„是execute()æ–ÒŽ(gu¨©)³•åQŒä½†Struts1.1å‘åŽå…¼å®¹perform()æ–ÒŽ(gu¨©)³•ã€‚ä½†ä½ ä‹É用Struts1.1创å¾ä¸€ä¸ªAction的派生类åQŒåƈ且实çŽîCº†execute()æ–ÒŽ(gu¨©)³•åQŒè€Œä½ 在Struts1.0ä¸è¿è¡Œçš„è¯ï¼Œž®×ƒ¼šå¾—到"Document contained nodata" error message in Netscape or a completely empty (no HTML whatsoever) page rendered in Microsoft Internet Explorer.”的错误信æ¯ã€?br />
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异常
ServletException: BeanUtils.populate
解决æ–ÒŽ(gu¨©)¡ˆ
在用Strutsä¸Šä¼ æ–‡äšgæ—?é‡åˆ°äº†javax.servlet.ServletException: BeanUtils.populate异常ã€?br /> 我的ActionServletòq¶æ²¡æœ‰ç”¨åˆ°BeanUtils˜q™äº›å·¥å…·¾c…R€‚åŽæ¥ä»”¾l†æ£€æŸ¥ä»£ç å‘现是在jspæ–‡äšg里的formå¿˜äº†åŠ enctype="multipart/form-data" 了。所以写½E‹åºé‡åˆ°é”™è¯¯æˆ–异常应该从多方é¢è€ƒè™‘问题å˜åœ¨çš„å¯èƒ½æ€§ï¼Œæƒ›_ˆ°¾pÈ»Ÿæ示信æ¯ä»¥å¤–的东è¥Ñ€?br /> ----------------------------------------------------------------------------------------------------------------------------
1. 定义Actionå? 如果指定了name, 那么必须è¦å®šä¹‰ä¸€ä¸ªä¸Žå®ƒåŒåçš„FormBeanæ‰èƒ½˜q›è¡Œformæ˜ å°„.2. 如果定义Actionå? æ交™åµé¢æ—¶å‡ºçŽ?nbsp;"No input attribute for mapping path
" 错误, 则需è¦åœ¨å…¶input属性ä¸å®šä¹‰è½¬å‘的页é?3. 如果æ’入新的数æ®æ—¶å‡ºçŽ?nbsp;"Batch update row count wrong:" 错误, 则说明XXX.hbm.xmlä¸æŒ‡å®šçš„key的类型äؓ原始¾cÕdž‹(int, long),å› äØ“˜q™ç§¾cÕdž‹ä¼šè‡ªåŠ¨åˆ†é…å€? 而这个值往往会让¾pÈ»Ÿè®¤äØ“å·²ç»å˜åœ¨è¯¥è®°å½? æ£ç¡®çš„方法是使用java.lang.Integer或java.lang.Long对象.4. 如果æ’入数æ®æ—¶å‡ºçŽ?nbsp;"argument type mismatch" 错误, å¯èƒ½æ˜¯ä½ 使用了Date½{‰ç‰¹ŒDŠå¯¹è±? å› äØ“strutsä¸èƒ½è‡ªåŠ¨ä»ŽStringåž‹è{æ¢æˆDateåž?所ä»? ä½ éœ€è¦åœ¨Actionä¸æ‰‹åŠ¨æŠŠStringåž‹è{æ¢æˆDateåž?5. Hibernateä¸? Queryçš„iterator()比list()æ–ÒŽ(gu¨©)³•å¿«å¾ˆå¤?6. 如果出现 "equal symbol expected" 错误, è¯´æ˜Žä½ çš„strtusæ ‡ç¾ä¸åŒ…å«å¦ä¸€ä¸ªæ ‡½{¾æˆ–者å˜é‡? 例如:<html:select property="test" onchange="<%=test%>"/>
或�br /> <html:hidden property="test" value="<bean:write name="t" property="p"/>"/>
˜q™æ ·çš„情å†?img src="http://www.aygfsteel.com/Images/dot.gif" alt="" />
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错误åQšException in thread "main" org.hibernate.exception.SQLGrammarException: Could not execute JDBC batch updateåŽŸå› ä¸Žè§£å†»I¼š å› äØ“Hibernate ToolsåQˆæˆ–者Eclipse本èínçš„Database ExploreråQ‰ç”Ÿæˆ?/span>*.hbn.xml工具ä¸åŒ…å«æœ‰catalog="***"åQ?/span>*表示数æ®åº“å¿UŽÍ¼‰˜q™æ ·çš„属æ€?ž®†è¯¥å±žæ€§åˆ 除就å¯ä»¥äº?br /> ---------------------------------------------------------------------------------------------------------------------------
错误åQšorg.hibernate.ObjectDeletedException: deleted object would be re-saved by cascade (remove deleted object from associations)
åŽŸå› ä¸Žè§£å†»I¼š
æ–ÒŽ(gu¨©)³•1 åˆ é™¤Set方的cascade
æ–ÒŽ(gu¨©)³•2 解决兌™”关系åŽï¼Œå†åˆ é™?br /> æ–ÒŽ(gu¨©)³•3 在many-to-oneæ–¹å¢žåŠ cascade 但å€ég¸èƒ½æ˜¯none
最åŽä¸€æ‹›ï¼š
‹‚€æŸ¥ä¸€ä¸‹hashCode equals是å¦ä½¿ç”¨äº†id作äØ“å”¯ä¸€æ ‡ç¤ºçš„é€‰é¡¹äº†ï¼›æˆ‘ç”¨uuid.hex时是没有问题的；但是用了nativeåQŒå°±ä¸è¡Œäº†ï¼Œæ€Žä¹ˆåŠžï¼Ÿåˆ 除啊ï¼
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问题åQšä»Šå¤©ç”¨Tomcat 5.5.12åQŒå‘现原æ¥å¾ˆå¥½ç”¨çš„ç³»¾lŸä¸èƒ½ç”¨äº†ï¼Œå夋¹‹è¯•å‘现™åµé¢ä¸ä¸èƒ½åŒ…å?nbsp;taglibåQŒå¦åˆ™ä¼šå‡ºçŽ°ä»¥ä¸‹æ示åQšHTTP Status 500 -type Exception reportMessage description The server encountered an internal error () that prevented it from fulfilling this request.exceptionorg.apache.jasper.JasperException: /index.jsp(1,1) Unable to read TLD "META-INF/tlds/struts-bean.tld" from JAR file"file:*****/WEB-INF/lib/struts.jar":åŽŸå› åQšæ›´æ–îCº†å·¥ç¨‹ç”¨çš„libæ–‡äšg夹下的jaråQŒå‘布时也å‘布了servlet.jarå’Œjsp-api.jar。解冻I¼šæŠŠjsp-api.jaråˆ é™¤ž®Þp§£å†Œ™¿™ä¸ªé—®é¢˜äº†ã€?/span>-----------------------------------------------------------------------------------------------------------------------------
错误åQ?nbsp;java.lang.NullPointerException
åŽŸå› åQ?nbsp;å‘现 dao 实例ã€?nbsp;manage 实例½{‰éœ€è¦æ³¨å…¥çš„东西没有被注入（俗称½IºæŒ‡é’ˆå¼‚常）解决åQšè¿™ä¸ªæ—¶å€™ï¼Œä½ 应该查看日志文ä»Óž¼›é»˜è®¤æ˜¯åº”用æœåŠ¡å™¨çš?nbsp;log æ–‡äšgåQŒæ¯”å¦?nbsp;Tomcat ž®±æ˜¯ [Tomcat 安装目录 ]/logs åQ›ä½ 会å‘现æ½CÞZ½ åQšå¯èƒ½æ˜¯åQšorg.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sf' defined in ServletContextresource [/WEB-INF/applicationContext.xml]: Initialization of bean failed; nested exception isorg.hibernate.HibernateException: could not configure from URL: file:src/hibernate.cfg.xmlorg.hibernate.HibernateException: could not configure from URL: file:src/hibernate.cfg.xml……………………….Caused by: java.io.FileNotFoundException: src\hibernate.cfg.xmlå¯èƒ½æ˜¯ï¼šorg.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sessionFactory' defined inServletContext resource [/WEB-INF/applicationContext.xml]: Initialization of bean failed; nested exception isorg.hibernate.MappingException: Resource: com/mcc/coupon/model/UserRole.hbm.xml not foundorg.hibernate.MappingException: Resource: com/mcc/coupon/model/UserRole.hbm.xml not found然åŽä½ 就知é“åŽŸå› æ˜¯å› ä¸ºé…¾|®æ–‡ä»¶çš„解æžå‡ÞZº†é”™è¯¯åQŒè¿™ä¸ªé€šè¿‡ Web ™åµé¢æ˜¯çœ‹ä¸å‡ºæ¥çš„。更多的是æŒä¹…化影射文äšg出的错误åQ›å¯¼è‡´äº†æ²¡æœ‰è¢«è§£æžï¼›å½“ç„¶ä½ éœ€è¦çš„功能ž®±æ— 法ä‹É用了ã€?br /> ----------------------------------------------------------------------------------------------------------------------------
错误åQšStandardWrapperValve[action]: Servlet.service() for servlet action threw exception
javax.servlet.jsp.JspException: Cannot retrieve mapping for action /settlementTypeManage
或者： type Status report message Servlet action is not available description The requested resource (Servlet action is not available) is not available.
åŽŸå› åQ?nbsp;å?nbsp;ä¸?br /> ----------------------------------------------------------------------------------------------------------------------------
错误StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exceptionjava.lang.ClassNotFoundException: org.apache.struts.taglib.bean.CookieTeiç•Œé¢é”™è¯¯å…·ä½“æè¿°åQ?br /> org.apache.jasper.JasperException: Failed to load or instantiate TagExtraInfo class: org.apache.struts.taglib.bean.CookieTei
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æ¥è‡ªåQ?a >http://hi.baidu.com/wszfer/blog/item/ca7fadf44dbe2bd3f2d38596.html
瓜瓜 2010-01-10 21:27 å‘表评论
]]>好处åQšç½‘¾lœä¿¡æ¯åŸºäºŽè‹±æ–‡ï¼Œä¸ÞZº†å‡å°‘ä¼ è¾“è‹±æ–‡å—符 çš„å—½W¦é‡åQŒå¯ä»¥ç”¨UTF-8.
4.gb2312åQšä¸æ–‡ã€?br /> 5.GBKåQšæ‰©å±•gb2312.
6.ISO-8859-1åQšè¥¿æ–V€?/span>
瓜瓜 2009-07-20 17:03 å‘表评论
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import java.util.*;2
3
import javax.swing.JOptionPane;4
5
public class test6
{ 
7
public static void main(String args[ ]) 8
{ 
9
String str=JOptionPane.showInputDialog("输入½W¬ä¸€ä¸ªæ—¥æœŸçš„òq´ä†¾:");10
int yearOne=Integer.parseInt(str);11
str=JOptionPane.showInputDialog("输入该年的月�");12
int monthOne=Integer.parseInt(str);13
str=JOptionPane.showInputDialog("输入该月份的日期:");14
int dayOne=Integer.parseInt(str);15
str=JOptionPane.showInputDialog("输入½W¬äºŒä¸ªæ—¥æœŸçš„òq´ä†¾:");16
int yearTwo=Integer.parseInt(str);17
str=JOptionPane.showInputDialog("输入该年的月�");18
int monthTwo=Integer.parseInt(str);19
str=JOptionPane.showInputDialog("输入该月份的日期:");20
int dayTwo=Integer.parseInt(str);21
Calendar calendar=Calendar.getInstance(); //åˆå§‹åŒ–日历对è±?/span>22
calendar.set(yearOne, monthOne, dayOne); //ž®†calendar的时间设¾|®äØ“yearOneòq´monthOne月dayOneæ—?/span>23
long timeOne= calendar.getTimeInMillis() ; //calendar表示的时间è{æ¢æˆæ¯«ç§’24
calendar.set(yearTwo, monthTwo, dayTwo); //ž®†calendar的时间设¾|®äØ“yearTwoòq´monthTwo月dayTwoæ—?/span>25
long timeTwo= calendar.getTimeInMillis(); //calendar表示的时间è{æ¢æˆæ¯«ç§’ã€?/span>26
Date date1=new Date(timeOne); // 用timeOneåšå‚æ•°æž„é€ date127
Date date2=new Date(timeTwo); // 用timeTwoåšå‚æ•°æž„é€ date228
if(date2.equals(date1))29
{30
System.out.println("两个日期的年ã€æœˆã€æ—¥å®Œå…¨ç›¸åŒ");31
}32
else if(date2.after(date1))33
{34
System.out.println("æ‚(zh¨¨n)¨è¾“入的½W¬äºŒä¸ªæ—¥æœŸå¤§äºŽç¬¬ä¸€ä¸ªæ—¥æœ?/span>");35
}36
else if(date2.before(date1))37
{38
System.out.println("æ‚(zh¨¨n)¨è¾“入的½W¬äºŒä¸ªæ—¥æœŸå°äºŽç¬¬ä¸€ä¸ªæ—¥æœ?/span>");39
}40
long days=Math.abs((timeOne-timeTwo)/1000/60/60/24);;//计算两个日期盔Rš”天数41
System.out.println(yearOne+"òq?/span>"+monthOne+"æœ?/span>"+dayOne+"日和"42
+yearTwo+"òq?/span>"+monthTwo+"æœ?/span>"+dayTwo+"ç›”Rš”"+days+"å¤?/span>");43
} 44
}
瓜瓜 2009-05-13 12:48 å‘表评论
]]>jdbc包，用构å»ø™µ\径，‹¹‹è¯•é©±åŠ¨åŠ è²å¤ÞpÓ|。ã€?/p>
必须攑֜¨tomcat\lib里边æ‰èƒ½åŠ è²æˆåŠŸã€‚éƒé—äh»äº†ã€‚ã€?/p>
bt
web.xmlé…ç½®
<context-param>
<param-name>driver</param-name>
<param-value>com.microsoft.sqlserver.jdbc.SQLServerDriver</param-value>
</context-param>
<context-param>
<param-name>url</param-name>
<param-value>jdbc:sqlserver://localhost:1433; dat
¾cÕdˆ«åQ?/b>Java 查看评论
æ–‡ç« æ¥æº:http://hi.baidu.com/wszfer/blog/item/689bdefa5ff2a99f58ee9034.html
瓜瓜 2009-04-29 12:50 å‘表评论
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