servlet类的简单运用

public class Hello extends HttpServlet{
	String servletName;
	String string_account;
	String string_pwd;
	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		req.setCharacterEncoding("GBK");
		resp.setCharacterEncoding("GBK");
		string_account=req.getParameter("account");
		string_pwd=req.getParameter("password");
		PrintWriter out=resp.getWriter();
		if(string_account.equals("liuxj")&&string_pwd.equals("8888")){
			out.println("<html><body>");
			out.println("<h1>"+"++++！"+"<h1>");
			out.println("</body></html>");
		}else{
			out.print("+++++");
			req.getRequestDispatcher("Login.jsp").forward(req, resp);
		}
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		// TODO Auto-generated method stub
		this.doGet(req, resp);
	}

要继承HttpServlet类，重写doGet()和doPost()函数，这两个函数分别接受get和post的请求，我们将方法写到get中，在post中调用doGet()方法，使代码分工明显
req.getRequestDispatcher();函数实现servlet跳转到jsp页面

<servlet>
		<servlet-name>login</servlet-name>
		<servlet-class>dalian.Hello</servlet-class>
	</servlet>
	<servlet-mapping>
		<servlet-name>login</servlet-name>
		<url-pattern>/LOGIN</url-pattern>
	</servlet-mapping>

建立一个servlet就得在xml文件上，写一个servlet部署：
servlet-class是写在java Resource文件夹的src文件夹下的.java文件
url-pattern是url上的虚拟路径名

servlet类的简单运用

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