标签：servlet
一：hello，world程序
public class Hello extends HttpServlet {
public voiddoGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException,IOException {
PrintWriterout=resp.getWriter();
out.println("<html>");
out.println("<head><title>hello</title></head>");
out.println("<body>");
out.println("<h1>hello,word</h1>");
out.println("</body>");
out.println("</html>");
}
}
web.xml文件配置
<servlet>
<servlet-name>Hello</servlet-name>
<servlet-class>com.cloud.Demo1.Hello</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Hello</servlet-name>
<url-pattern>/Hello</url-pattern>
</servlet-mapping>
访问地址:
http://localhost:8080/servlet/Hello
二：处理表单提交
1. 页面
<body>
<form action="/servlet/Input"method="get">
<inputtype="text" name="info">
<inputtype="submit" value="提交">
</form>
</body>
2. 接收页面
public voiddoGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException,IOException {
PrintWriter out=resp.getWriter();
Stringinfo=req.getParameter("info");
out.println("<html>");
out.println("<head><title>hello</title></head>");
out.println("<body>");
out.println("<h1>"+info+"</h1>");
out.println("</body>");
out.println("</html>");
}
3. 配置web.xml
<servlet>
<servlet-name>Input</servlet-name>
<servlet-class>com.cloud.Demo1.Input</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Input</servlet-name>
<url-pattern>/Input</url-pattern>
</servlet-mapping>
注意事项：
1．提交路径
/项目名/文件名à action="/servlet/Input"
2.提交方法和接收方法必须相同
post提交post接收，get提交get接收
三：servlet生命周期
1. 加载servlet
2. 初始化
3. 处理服务
4. 销毁
5. 卸载
serlife.java
public class serlife extends HttpServlet {
public void init() throws ServletException {
System.out.println("servlet初始化");
}
public voiddoGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException,IOException {
doPost(request,response);
System.out.println("servlet服务：doGet,doPost");
}
public voiddoPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException,IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
}
public void destroy() {
super.destroy();// Just puts "destroy" string inlog
System.out.println("销毁servlet");
}
}
web.xml配置
<servlet>
<servlet-name>serlife</servlet-name>
<servlet-class>com.cloud.Demo1.serlife</servlet-class>
<!-- 配置设成自动加载 -->
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>serlife</servlet-name>
<url-pattern>/serlife</url-pattern>
</servlet-mapping>
四：获取初始化信息
public classserlife extends HttpServlet {
private String initParam=null;
public void init(ServletConfigconfig) throwsServletException {
System.out.println("servlet初始化");
this.initParam=config.getInitParameter("href");
}
public voiddoGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException,IOException {
doPost(request,response);
System.out.println("servlet服务：doGet,doPost"+this.initParam);
}
web.xml
<servlet>
<servlet-name>serlife</servlet-name>
<servlet-class>com.cloud.Demo1.serlife</servlet-class>
<!-- 配置初始化信息 -->
<init-param>
<param-name>href</param-name>
<param-value>Spring</param-value>
</init-param>
</servlet>
版权声明：博主原创文章，转载请说明出处。http://blog.csdn.net/dzy21
标签：servlet
原文地址：http://blog.csdn.net/dzy21/article/details/47275777
