我想显示没有回帖的帖子,但总是不能成功,这是部分代码:{0}
<%
String author = request.getParameter("author");
List allThreadByName = new ArrayList();
allThreadByName = td.queryThreadsAll();//从所有ThreadsData.java中
Iterator iter = allThreadByName.iterator();
while(iter.hasNext()){
Threads threads = (Threads)iter.next();
int threadid = threads.getThreadid();
String emotionurl = threads.getEmotionurl();
String topic = threads.getTopic();
String description = threads.getDescription();
String authors = threads.getAuthor();
String lastname = threads.getLastname();
String posttime = threads.getPosttime();
String lasttime = threads.getLasttime();
int totalviews = threads.getTotalviews();
int totalreplies = threads.getTotalreplies();
System.out.println("我在topic.jsp中看看totalreplies="+totalreplies);
int threadtop = threads.getThreadtop();
int isgood = threads.getIsgood();
if(smenu.equals("some")){
String postauthor = request.getParameter("author");
if(postauthor.equals(authors)){
%>
<tbody>
<%
if(threadtop==1){
%>
<tr align="center">
<td style="text-align: left;"><img src="image/topic-pinned.gif" class="topic" /> <%
if(!emotionurl.equals("wu")){
%>
<img src=<%=emotionurl%> />
<%
}
%>
<font color="#0d00aa"><a href="Posts.jsp?threadid=<%=threadid %>"><%=topic %></a></font></td>
<td class="author">
<font color="#0d00aa"><a href="u_datum.jsp?menu=<%=authors %>"><%=authors%></a></font><br>
<font><%=posttime %></font>
</td>
<%
if(totalreplies>0){
%>
<td><font><%=totalreplies %></font></td>
<%
}else{
%>
<td>-</td>
<%
}
if(totalviews>0){
%>
<td><font><%=totalviews %></font></td>
<%
}else{
%>
<td>0</td>
<%
}
%>
<td><font><%=lasttime%></font><br>by <font color="#0d00aa"><a href="u_datum.jsp?menu=<%=lastname %>"><%=lastname %></a></font></td>
</tr>
<%
}else{
%>
<tr align="center">
<%
if(isgood == 0){
%>
<td style="text-align: left;"><img src="image/topic.gif" /> <%
if(!emotionurl.equals("wu")){
%>
<img src=<%=emotionurl%> />
<%
}
%> <font color="#0d00aa"><a href="Posts.jsp?threadid=<%=threadid %>"><%=topic %></a></font></td>
<%
}else{
%>
<td style="text-align: left;"><img src="image/topic-popular.gif" /> <%
if(!emotionurl.equals("wu")){
%>
<img src=<%=emotionurl%> />
<%
}
%> <font color="#0d00aa"><a href="Posts.jsp?threadid=<%=threadid %>"><%=topic %></a></font></td>
<%
}
%>
<td>
<font color="#0d00aa"><a href="u_datum.jsp?menu=<%=authors %>"><%=authors%></a></font><br>
<font><%=posttime %></font>
</td>
<%
if(totalreplies>0){
%>
<td><font><%=totalreplies %></font></td>
<%
}else{
%>
<td>-</td>
<%
}
if(totalviews>0){
%>
<td><font><%=totalviews %></font></td>
<%
}else{
%>
<td>0</td>
<%
}
%>
<td><font><%=lasttime%></font><br>by <font color="#0d00aa"><a href="u_datum.jsp?menu=<%=lastname %>"><%=lastname %></a></font></td>
</tr>
<%
}
}
%>
</tbody>
<%
}
//从这儿开始是判断回帖数是否为0的帖子 if(smenu.equals("noreversion")){
if(totalreplies<=0){
System.out.println("看看总回帖数totalreplies="+totalreplies);
%>
<tbody>
<%
if(threadtop==1){
%>
<tr align="center">
<td style="text-align: left;"><img src="image/topic-pinned.gif" class="topic" /> <%
if(!emotionurl.equals("wu")){
%>
<img src=<%=emotionurl%> />
<%
}
%> <font color="#0d00aa"><a href="Posts.jsp?threadid=<%=threadid %>"><%=topic %></a></font></td>
<td class="author">
<font color="#0d00aa"><a href="u_datum.jsp?menu=<%=authors %>"><%=authors%></a></font><br>
<font><%=posttime %></font>
</td>
<%
if(totalreplies>0){
%>
<td><font><%=totalreplies %></font></td>
<%
}else{
%>
<td>-</td>
<%
}
if(totalviews>0){
%>
<td><font><%=totalviews %></font></td>
<%
}else{
%>
<td>0</td>
<%
}
%>
<td><font><%=lasttime%></font><br>by <font color="#0d00aa"><a href="u_datum.jsp?menu=<%=lastname %>"><%=lastname %></a></font></td>
</tr>
<%
}else{
%>
<tr align="center">
<%
if(isgood == 0){
%>
<td style="text-align: left;"><img src="image/topic.gif" /> <%
if(!emotionurl.equals("wu")){
%>
<img src=<%=emotionurl%> />
<%
}
%> <font color="#0d00aa"><a href="Posts.jsp?threadid=<%=threadid %>"><%=topic %></a></font></td>
<%
}else{
%>
<td style="text-align: left;"><img src="image/topic-popular.gif" /> <%
if(!emotionurl.equals("wu")){
%>
<img src=<%=emotionurl%> />
<%
}
%> <font color="#0d00aa"><a href="Posts.jsp?threadid=<%=threadid %>"><%=topic %></a></font></td>
<%
}
%>
<td>
<font color="#0d00aa"><a href="u_datum.jsp?menu=<%=authors %>"><%=authors%></a></font><br>
<font><%=posttime %></font>
</td>
<%
if(totalreplies>0){
%>
<td><font><%=totalreplies %></font></td>
<%
}else{
%>
<td>-</td>
<%
}
if(totalviews>0){
%>
<td><font><%=totalviews %></font></td>
<%
}else{
%>
<td>0</td>
<%
}
%>
<td><font><%=lasttime%></font><br>by <font color="#0d00aa"><a href="u_datum.jsp?menu=<%=lastname %>"><%=lastname %></a></font></td>
</tr>
<%
}
%>
</tbody>
<%
}
}
本人在赶毕设,在过2天就答辩了,拜托各位高手帮帮忙!
请大家帮忙分析分析代码,到底哪儿出错了?
<%
String author = request.getParameter("author");
List allThreadByName = new ArrayList();
allThreadByName = td.queryThreadsAll();//从所有ThreadsData.java中
Iterator iter = allThreadByName.iterator();
while(iter.hasNext()){
Threads threads = (Threads)iter.next();
int threadid = threads.getThreadid();
String emotionurl = threads.getEmotionurl();
String topic = threads.getTopic();
String description = threads.getDescription();
String authors = threads.getAuthor();
String lastname = threads.getLastname();
String posttime = threads.getPosttime();
String lasttime = threads.getLasttime();
int totalviews = threads.getTotalviews();
int totalreplies = threads.getTotalreplies();
System.out.println("我在topic.jsp中看看totalreplies="+totalreplies);
int threadtop = threads.getThreadtop();
int isgood = threads.getIsgood();
if(smenu.equals("some")){
String postauthor = request.getParameter("author");
if(postauthor.equals(authors)){
%>
<tbody>
<%
if(threadtop==1){
%>
<tr align="center">
<td style="text-align: left;"><img src="image/topic-pinned.gif" class="topic" /> <%
if(!emotionurl.equals("wu")){
%>
<img src=<%=emotionurl%> />
<%
}
%>
<font color="#0d00aa"><a href="Posts.jsp?threadid=<%=threadid %>"><%=topic %></a></font></td>
<td class="author">
<font color="#0d00aa"><a href="u_datum.jsp?menu=<%=authors %>"><%=authors%></a></font><br>
<font><%=posttime %></font>
</td>
<%
if(totalreplies>0){
%>
<td><font><%=totalreplies %></font></td>
<%
}else{
%>
<td>-</td>
<%
}
if(totalviews>0){
%>
<td><font><%=totalviews %></font></td>
<%
}else{
%>
<td>0</td>
<%
}
%>
<td><font><%=lasttime%></font><br>by <font color="#0d00aa"><a href="u_datum.jsp?menu=<%=lastname %>"><%=lastname %></a></font></td>
</tr>
<%
}else{
%>
<tr align="center">
<%
if(isgood == 0){
%>
<td style="text-align: left;"><img src="image/topic.gif" /> <%
if(!emotionurl.equals("wu")){
%>
<img src=<%=emotionurl%> />
<%
}
%> <font color="#0d00aa"><a href="Posts.jsp?threadid=<%=threadid %>"><%=topic %></a></font></td>
<%
}else{
%>
<td style="text-align: left;"><img src="image/topic-popular.gif" /> <%
if(!emotionurl.equals("wu")){
%>
<img src=<%=emotionurl%> />
<%
}
%> <font color="#0d00aa"><a href="Posts.jsp?threadid=<%=threadid %>"><%=topic %></a></font></td>
<%
}
%>
<td>
<font color="#0d00aa"><a href="u_datum.jsp?menu=<%=authors %>"><%=authors%></a></font><br>
<font><%=posttime %></font>
</td>
<%
if(totalreplies>0){
%>
<td><font><%=totalreplies %></font></td>
<%
}else{
%>
<td>-</td>
<%
}
if(totalviews>0){
%>
<td><font><%=totalviews %></font></td>
<%
}else{
%>
<td>0</td>
<%
}
%>
<td><font><%=lasttime%></font><br>by <font color="#0d00aa"><a href="u_datum.jsp?menu=<%=lastname %>"><%=lastname %></a></font></td>
</tr>
<%
}
}
%>
</tbody>
<%
}
//从这儿开始是判断回帖数是否为0的帖子 if(smenu.equals("noreversion")){
if(totalreplies<=0){
System.out.println("看看总回帖数totalreplies="+totalreplies);
%>
<tbody>
<%
if(threadtop==1){
%>
<tr align="center">
<td style="text-align: left;"><img src="image/topic-pinned.gif" class="topic" /> <%
if(!emotionurl.equals("wu")){
%>
<img src=<%=emotionurl%> />
<%
}
%> <font color="#0d00aa"><a href="Posts.jsp?threadid=<%=threadid %>"><%=topic %></a></font></td>
<td class="author">
<font color="#0d00aa"><a href="u_datum.jsp?menu=<%=authors %>"><%=authors%></a></font><br>
<font><%=posttime %></font>
</td>
<%
if(totalreplies>0){
%>
<td><font><%=totalreplies %></font></td>
<%
}else{
%>
<td>-</td>
<%
}
if(totalviews>0){
%>
<td><font><%=totalviews %></font></td>
<%
}else{
%>
<td>0</td>
<%
}
%>
<td><font><%=lasttime%></font><br>by <font color="#0d00aa"><a href="u_datum.jsp?menu=<%=lastname %>"><%=lastname %></a></font></td>
</tr>
<%
}else{
%>
<tr align="center">
<%
if(isgood == 0){
%>
<td style="text-align: left;"><img src="image/topic.gif" /> <%
if(!emotionurl.equals("wu")){
%>
<img src=<%=emotionurl%> />
<%
}
%> <font color="#0d00aa"><a href="Posts.jsp?threadid=<%=threadid %>"><%=topic %></a></font></td>
<%
}else{
%>
<td style="text-align: left;"><img src="image/topic-popular.gif" /> <%
if(!emotionurl.equals("wu")){
%>
<img src=<%=emotionurl%> />
<%
}
%> <font color="#0d00aa"><a href="Posts.jsp?threadid=<%=threadid %>"><%=topic %></a></font></td>
<%
}
%>
<td>
<font color="#0d00aa"><a href="u_datum.jsp?menu=<%=authors %>"><%=authors%></a></font><br>
<font><%=posttime %></font>
</td>
<%
if(totalreplies>0){
%>
<td><font><%=totalreplies %></font></td>
<%
}else{
%>
<td>-</td>
<%
}
if(totalviews>0){
%>
<td><font><%=totalviews %></font></td>
<%
}else{
%>
<td>0</td>
<%
}
%>
<td><font><%=lasttime%></font><br>by <font color="#0d00aa"><a href="u_datum.jsp?menu=<%=lastname %>"><%=lastname %></a></font></td>
</tr>
<%
}
%>
</tbody>
<%
}
}
本人在赶毕设,在过2天就答辩了,拜托各位高手帮帮忙!
请大家帮忙分析分析代码,到底哪儿出错了?
2、建议不要在循环中创建太多变量
肯定是从代码这儿:
code={0}
//从这儿开始是判断回帖数是否为0的帖子 if(smenu.equals("noreversion")){
if(totalreplies<=0){
System.out.println("看看总回帖数totalreplies="+totalreplies);[/code] 开始出现问题的。
到底是哪儿出错了,高手帮忙啊???
//从这儿开始是判断回帖数是否为0的帖子 if(smenu.equals("noreversion")){
if(totalreplies<=0){
System.out.println("看看总回帖数totalreplies="+totalreplies);
呜呜.....
conn is:jdbc:oracle:thin:@localhost:1521:gaoyu, UserName=SYSTEM, Oracle JDBC driver
我在tools.DbConn中数据库连接成功!!
我在topic.jsp循环输出中看看authors=gaofeng
我在topic.jsp中看看totalreplies=0
我在topic.jsp中看看:smenu=noreversion
看看总回帖数totalreplies=0
2011-5-21 21:50:54 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at org.apache.jsp.topic_jsp._jspService(topic_jsp.java:770)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:374)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:342)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:267)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at logfilter.EncodingFilter.doFilter(EncodingFilter.java:50)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)请大家帮忙解答下,为什么不能显示没有回复的帖子?
关键是Myeclipse的跟踪调试,我不会,
lianghaijian
你好,你有其他的解决办法吗?
if(totalreplies<=0){
System.out.println("看看总回帖数totalreplies="+totalreplies);里面嵌套有if(totalreplies<=0)..这是怎么回事
if(totalreplies<=0){
System.out.println("看看总回帖数totalreplies="+totalreplies);里面嵌套有if(totalreplies>0) 这是怎么回事。。
既然是topic这个JSP页面上出空异常,
那么你去看下tomcat目录下的work目录里的topic_jsp.java这个Servlet文件!
它也告诉你了是770出现异常,而且是在Service里,这样你再找找,你的JSP页面我看的头痛!
totalreplies是帖子的总回复数,如果总回复数<=0,那么就说明该帖子没有人回复,就要显示该帖子啊
liutianxiong888
,你好!
我不明白这个770是什么意思啊?你能说得详细点吗,谢谢!
如:
emotionurl.equals("wu") 修改为
"wu".equals(emotionurl)但这个可能不是最终解决方案,你的代码可能存在逻辑错误。
唐大哥,你真是太牛了!
我的问题,又在一次被你解决了!唐大哥,小弟我希望这2天你能常来java->web版块。
毕业设计都亮红灯了!
谢谢唐大哥啊!当然,也谢谢其他的朋友!
引用 12 楼 ncist_jianeng 的回复:
if(smenu.equals("noreversion")){
if(totalreplies<=0){
System.out.println("看看总回帖数totalreplies="+totalreplies);里面嵌套有if(totalreplies<=0)..这是怎么回事
totalreplies是帖子的总回复……
你既然判断了totalreplies<=0。。再在这里面嵌套totalreplies>0..这不就矛盾了吗?