头大了。。。
Java环境变量配置如下：
Java_HOME：D:\jdk1.5.0_06
CLASSPATH：
.;D:\jdk1.5.0_06\lib;D:\jdk1.5.0_06\lib\tools.jar;D:\jdk1.5.0_06\jre\lib\rt.jar;D:\jdk1.5.0_06\lib\dt.jar;
PATH:D:\jdk1.5.0_06;D:\jdk1.5.0_06\bin;
可是当把以下两个文件放在同一个目录下编译时怎么都通不过。
HelloServlet3.java
[code]
package moreservlets;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloServlet3 extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType( "text/html ");
PrintWriter out = response.getWriter();
String title = "Hello (3) ";
out.println(ServletUtilities.headWithTitle(title) +
" <BODY BGCOLOR=\ "#FDF5E6\ "> \n " +
" <H1> " + title + " </H1> \n " +
" </BODY> </HTML> ");
}
}
[/code]
ServletUtilities
[code]
package moreservlets;
import javax.servlet.*;
import javax.servlet.http.*;
public class ServletUtilities {
public static final String DOCTYPE =
" <!DOCTYPE HTML PUBLIC \ "-//W3C//DTD HTML 4.0 " +
"Transitional//EN\ "> ";
public static String headWithTitle(String title) {
return(DOCTYPE + "\n " +
" <HTML> \n " +
" <HEAD> <TITLE> " + title + " </TITLE> </HEAD> \n ");
}
public static int getIntParameter(HttpServletRequest request,
String paramName,
int defaultValue) {
String paramString = request.getParameter(paramName);
int paramValue;
try {
paramValue = Integer.parseInt(paramString);
} catch(NumberFormatException nfe) { // null or bad format
paramValue = defaultValue;
}
return(paramValue);
}
public static String getCookieValue(Cookie[] cookies,
String cookieName,
String defaultValue) {
if (cookies != null) {
for(int i=0; i <cookies.length; i++) {
Cookie cookie = cookies[i];
if (cookieName.equals(cookie.getName()))
return(cookie.getValue());
}
}
return(defaultValue);
}
public static Cookie getCookie(Cookie[] cookies,
String cookieName) {
if (cookies != null) {
for(int i=0; i <cookies.length; i++) {
Cookie cookie = cookies[i];
if (cookieName.equals(cookie.getName()))
return(cookie);
}
}
return(null);
}
public static String filter(String input) {
StringBuffer filtered = new StringBuffer(input.length());
char c;
for(int i=0; i <input.length(); i++) {
c = input.charAt(i);
if (c == ' < ') {
filtered.append( "< ");
} else if (c == '> ') {
filtered.append( "> ");
} else if (c == ' " ') {
filtered.append( "" ");
} else if (c == '& ') {
filtered.append( "& ");
} else {
filtered.append(c);
}
}
return(filtered.toString());
}
}
[/code]
错误信息如下：
HelloServlet3.java:23: 找不到符号
符号： 变量 ServletUtilities
位置： 类 moreservlets.HelloServlet3
out.println(ServletUtilities.headWithTitle(title) +
^
[解决办法]
1. 你是否已经编译了ServletUtilities?
2. 为什么不用eclipse之类的工具 在这种事情上浪费时间不值得
[解决办法]
2.我是初学，先不要用IDE比较好
=> 这是误导 工欲善其事 必先利其器!
