我只是想一个非常简单的web应用程序,从摄氏温度转换为°F和K.Tomcat的错误:资源不可用(HTTP 404)
所有的源代码,XML等,被认为是正确的,因为我从书中拿走它。
Java版本 - 1.7
Tomcat的版本 - 8.0
操作系统:Windows 8.0
错误显示,当我进入http://localhost:8080/lab4/。
Tomcat运行正常,我可以部署和使用其他webapps。
另外,我正在使用一个名为convert的自定义标记。
的Java类处理程序
package net.thinksquared.lab4;
import javax.servlet.jsp.tagext.*;
import javax.servlet.jsp.tagext.BodyTagSupport;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.*;
public class Converter extends BodyTagSupport{
private String _to;
public String getTo() {
return _to;
}
public void setTo(String to) {
_to = to;
}
public int doAfterBody(){
try {
BodyContent bc = getBodyContent();
JspWriter out = bc.getEnclosingWriter();
double result = 0.0;
double temp = Double.parseDouble(bc.getString());
if(_to.equals("F")) {
result = toFahrenheit(temp);
} else {
result = toKelvin(temp);
}
bc.getEnclosingWriter().print(result);
} catch(Exception E) {
}
return EVAL_PAGE; //tells servlet container to process rest of JSP page.
}
private double toFahrenheit(double c){
return 32.0 + (c*1.8);
}
private double toKelvin(double c){
return 273.0 + c;
}
}
JSP
<%@ page contentType="text/html language="java";charset=UTF-8" %>
<%@ taglib uri="/tags/lab4-converter" prefix="temp" %>
<temp:convert to="F">100</temp:convert>
TLD
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.1//EN"
"http://java.sun.com/j2ee/dtds/web-jsptaglibrary_1_1.dtd">
<taglib>
<tlibversion>1.2</tlibversion>
<jspversion>1.1</jspversion>
<tag>
<name>convert</name>
<tagClass>net.thinksquared.lab4.Converter</tagClass>
<bodyContent>JSP</bodyContent>
<attribute>
<name>to</name>
<required>no</required>
</attribute>
</tag>
<taglib>
的web.xml
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE web-app
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.2//EN"
"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">
<web-app>
<display-name>Lab4: Custom Tags</display-name>
<welcome-file-list>
<welcome-file>test.jsp</welcome-file>
</welcome-file-list>
<taglib>
<taglib-uri>/tags/lab4-converter</taglib-uri>
<taglib-location>/WEB-INF/lab4-converter.tld</taglib-location>
</taglib>
</web-app>
最后,我有这批编译和构建。 的compile.bat
@echo off
REM ----------------------------------------------------------------------
REM This batch file creates a WAR file for Lab 4, the lab on custom tags.
REM The output is lab4.war.
REM
REM NOTE: To get this batch file on your system, you should change the
REM PATH variable to point to your JDK location.
REM ----------------------------------------------------------------------
set PATH=%PATH%;C:\Program Files\Java\jdk1.7.0_55\bin
set APP_NAME=lab4
echo Cleaning up build directory
rmdir /S/Q build
echo Creating buildnment directory
mkdir build\WEB-INF\classes
echo Installing web.xml and .tld files
copy .\web\WEB-INF\*.* .\build\WEB-INF\*.*
echo Installing web pages
copy .\web\ .\build\
echo Compiling java code
javac -deprecation -d build/WEB-INF/classes -classpath ./lib/jsp-api.jar ./src/*.java
cd build
echo creating WAR file
jar cvf %APP_NAME%.war .
copy %APP_NAME%.war ..
pause
I'm working with these directory:
如果使用http:// localhost:8080/lab4 /获得404,则表示无法找到您的欢迎文件。因此标签代码不相关。此外,您可以通过管理器应用查看您的网络应用是否已加载并正在运行。 – rickz