初學servlet之使用web.xml配置
先寫兩個servlet,之後展示web.xml配置
package app01c;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 如何訪問:
* http://localhost:端口號(使用tomcat沒有修改過的是8080)/項目名/下面WebServlet中的urlPatterns
* 如果使用的是web.xml配置文件,那麽訪問路徑就變為:
* http://localhost:端口號(使用tomcat沒有修改過的是8080)/項目名/web.xml中該servlet對應的url-pattern
* @author Administrator
*
*/
public class SimpleServlet extends HttpServlet {
private static final long serialVersionUID = 8946L;
@Override
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter writer = response.getWriter();
writer.print("<html><head></head>" +
"<body>Simple Servlet</body></html");
}
}
package app01c;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* 如何訪問:
* http://localhost:端口號(使用tomcat沒有修改過的是8080)/項目名/下面WebServlet中的urlPatterns
* 如果使用的是web.xml配置文件,那麽訪問路徑就變為:
* http://localhost:端口號(使用tomcat沒有修改過的是8080)/項目名/web.xml中該servlet對應的url-pattern
* @author Administrator
*
*/
public class WelcomeServlet extends HttpServlet {
private static final long serialVersionUID = 27126L;
@Override
public void doGet(HttpServletRequest request,
HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter writer = response.getWriter();
writer.print("<html><head></head>"
+ "<body>Welcome</body></html>");
}
}
<?xml version="1.0" encoding="ISO-8859-1"?>
<web-app xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
version="3.0">
<servlet>
<!-- name表示對應servlet的類名 -->
<servlet-name>SimpleServlet</servlet-name>
<!-- class表示完整的路徑 -->
<servlet-class>app01c.SimpleServlet</servlet-class>
<!-- load-on-startup這個元素使得Servlet在啟動時加載,而不是在第一次調用時加載 -->
<load-on-startup>10</load-on-startup>
</servlet>
<servlet-mapping>
<!-- 與上面的name必須相同 -->
<servlet-name>SimpleServlet</servlet-name>
<!-- 與WebServlet的urlPatterns相同,利用url訪問的時候有用,還有就是form表單中的action的內容 -->
<url-pattern>/simple</url-pattern>
</servlet-mapping>
<servlet>
<servlet-name>WelcomeServlet</servlet-name>
<servlet-class>app01c.WelcomeServlet</servlet-class>
<load-on-startup>20</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>WelcomeServlet</servlet-name>
<url-pattern>/welcome</url-pattern>
</servlet-mapping>
</web-app>
初學servlet之使用web.xml配置