First Servlet(Servlet 学习日记)
前期准备
- IDE: MyEclipse 2014
详细步骤
- 新建一个web project
- 右键新建servlet
3.代码详细如下
import java.io.DataOutputStream; 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; import net.sf.json.JSONObject; public class Test extends HttpServlet { /** * Constructor of the object. */ public Test() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String username=request.getParameter("username"); String password=request.getParameter("password"); DataOutputStream outputStream=new DataOutputStream(response.getOutputStream()); outputStream.writeChars("success"); JSONObject obj=new JSONObject(); obj.put("username", "moon-sky"); obj.put("password", "hello"); outputStream.writeChars(obj.toString()); outputStream.close(); /*response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); out.println("<HTML>"); out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); out.println(" <BODY>"); out.print(" This is "); out.print(this.getClass()); out.println(", using the GET method"); out.println(" </BODY>"); out.println("</HTML>"); out.flush(); out.close();*/ } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">"); out.println("<HTML>"); out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>"); out.println(" <BODY>"); out.print(" This is "); out.print(this.getClass()); out.println(", using the POST method"); out.println(" </BODY>"); out.println("</HTML>"); out.flush(); out.close(); } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here } }` - 其中涉及到使用json包，这里还需要到一些挫折，刚开始的时候是按照Android 中的习惯，把json-lib-2.3-jdk15.jar直接添加进来，但是发现还是在运行过程中，报错java.lang.ClassNotFoundException: org.apache.commons.collections.map.ListOrderedMap，最终解决方法是直接把把jar包放到WEB-INF 的lib目录
- 最后一步，右键运行
- 然后在浏览器输入：
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时间： 2024-09-28 16:57:05