1、目录结构
2、各文件内容
index.jsp
<%@ page contenttype="text/html;charset=utf-8" language="java" %> <html> <head> <title>$title$</title> </head> <body> <form action="/servlet" method="post"> <input type="submit" value="提交"> </form> </body> </html>
web.xml
<?xml version="1.0" encoding="utf-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> <servlet> <servlet-name>servlet</servlet-name> <servlet-class>web.servlet.servlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>servlet</servlet-name> <url-pattern>/servlet</url-pattern> </servlet-mapping> </web-app>
servlet.java
package web.servlet; import javax.servlet.servletexception; import javax.servlet.annotation.webservlet; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; import java.io.ioexception; @webservlet(name = "servlet") public class servlet extends httpservlet { protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { system.out.println("dopost()..."); } protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { system.out.println("doget()..."); } }
正常运行后运行后,server控制台会出现输出“dopost()...”字符
3、当未配置web.xml时,出现的错误提示
<?xml version="1.0" encoding="utf-8"?> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance" xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" version="3.1"> </web-app>
解决方法:在web.xml中配置相关信息,或在servlet.java注解中添加内容:
@webservlet(name = "servlet",urlpatterns = "/servlet")
4、配置web.xml文件但未覆写doget()和dopost()方法,或未覆写相对应的方法出现的错误提示
package web.servlet; @webservlet(name = "servlet") public class servlet extends httpservlet { }
package web.servlet; import javax.servlet.servletexception; import javax.servlet.annotation.webservlet; import javax.servlet.http.httpservlet; import javax.servlet.http.httpservletrequest; import javax.servlet.http.httpservletresponse; import java.io.ioexception; @webservlet(name = "servlet") public class servlet extends httpservlet { protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception { system.out.println("doget()..."); } }
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