J2ME HTTP方式与服务器交互信息:GET方式和POST方式

服务器端程序：

读取手机发送过来的两个参数信息，一个是用户账号account,一个是用户密码password，然后servlet

正确读取两个信息以后把两个参数返回给手机程序。

 1:  package com.example.servlets;

 2:  

 3:  import java.io.IOException;

 4:  import java.io.PrintWriter;

 5:  

 6:  import javax.servlet.ServletException;

 7:  import javax.servlet.http.HttpServlet;

 8:  import javax.servlet.http.HttpServletRequest;

 9:  import javax.servlet.http.HttpServletResponse;

10:  

11:  /**

12:   * Servlet implementation class HelloServlet

13:   */

14:  public class HelloServlet extends HttpServlet {

15:      private static final long serialVersionUID = 1L;

16:  

17:      /**

18:       * @see HttpServlet#HttpServlet()

19:       */

20:      public HelloServlet() {

21:          super();

22:          // TODO Auto-generated constructor stub

23:      }

24:  

25:      /**

26:       * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse

27:       *      response)

28:       */

29:      protected void doGet(HttpServletRequest request,

30:              HttpServletResponse response) throws ServletException, IOException {

31:          // response.getWriter().write("Hello, world!");

32:          // 从MIDlet发送的信息中读取参数

33:          String acct = request.getParameter("account"), pwd = request

34:                  .getParameter("password");

35:          if (acct == null || pwd == null) {

36:              response.sendError(HttpServletResponse.SC_BAD_REQUEST,

37:                      "Unable to read parameters");

38:              return;

39:          }

40:  

41:          // 返回信息给客户端

42:          response.setContentType("text/plain");

43:          // 以网页输出格式返回信息

44:          PrintWriter out = response.getWriter();

45:          out.print(this.getServletInfo() + "\n");

46:          out.print("acct:" + acct + "\npwd:" + pwd);

47:          out.close();

48:      }

49:  

50:      /**

51:       * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse

52:       *      response)

53:       */

54:      protected void doPost(HttpServletRequest request,

55:              HttpServletResponse response) throws ServletException, IOException {

56:          doGet(request, response);

57:      }

58:  

59:      // 返回服务器信息

60:      public String getServletInfo() {

61:          return "Hello,World\n\r";

62:      }

63:  

64:  }

65:  

GET方式与服务器交互（客户端）：

  1:  import java.io.IOException;

  2:  import java.io.InputStream;

  3:  import javax.microedition.io.Connector;

  4:  import javax.microedition.io.HttpConnection;

  5:  import javax.microedition.lcdui.Command;

  6:  import javax.microedition.lcdui.CommandListener;

  7:  import javax.microedition.lcdui.Display;

  8:  import javax.microedition.lcdui.Displayable;

  9:  import javax.microedition.lcdui.Form;

 10:  import javax.microedition.midlet.MIDlet;

 11:  import javax.microedition.midlet.MIDletStateChangeException;

 12:  

 13:  public class HttpGetExample extends MIDlet implements CommandListener {

 14:  

 15:      private Display display;

 16:      private Command exitCommand;

 17:      private Form mainForm;

 18:      private String password = "newuser";// 用户名

 19:      private String account = "123456";// 用户密码

 20:  

 21:      public HttpGetExample() {

 22:          display = Display.getDisplay(this);

 23:          exitCommand = new Command("Exit", Command.EXIT, 1);

 24:          mainForm = new Form("Data from servlet");

 25:          mainForm.addCommand(exitCommand);

 26:          mainForm.setCommandListener(this);

 27:      }

 28:  

 29:      protected void destroyApp(boolean arg0) throws MIDletStateChangeException {

 30:          // TODO Auto-generated method stub

 31:  

 32:      }

 33:  

 34:      protected void pauseApp() {

 35:          // TODO Auto-generated method stub

 36:  

 37:      }

 38:  

 39:      protected void startApp() throws MIDletStateChangeException {

 40:          display.setCurrent(mainForm);

 41:          // 访问服务器servlet

 42:          try {

 43:              callServlet();

 44:          } catch (IOException e) {

 45:              e.printStackTrace();

 46:          }

 47:      }

 48:  

 49:      private void callServlet() throws IOException {

 50:          HttpConnection http = null;

 51:          InputStream iStrm = null;

 52:          // 使用GET方式连接服务器

 53:          String url = "http://127.0.0.1:8080/ExampleWebProject/HelloServlet"

 54:                  + "?" + "account=" + account + "&" + "password=" + password;

 55:          try {

 56:              http = (HttpConnection) Connector.open(url);

 57:              // 使用HttpConnection.GET方式

 58:              // 发送Gety请求

 59:              http.setRequestMethod(HttpConnection.GET);

 60:  

 61:              // 服务器响应

 62:              if (http.getResponseCode() == HttpConnection.HTTP_OK) {

 63:                  iStrm = http.openInputStream();

 64:                  // 获得数据字节数

 65:                  int length = (int) http.getLength();

 66:                  // 获得数据信息

 67:                  if (length > 0) {

 68:                      byte servletData[] = new byte[length];

 69:                      iStrm.read(servletData);

 70:                      // 显示返回信息

 71:                      mainForm.append("验证通过：\n" + new String(servletData));

 72:                  } else {

 73:                      mainForm.append("不能访问数据！");

 74:                  }

 75:              }

 76:          } catch (Exception e) {

 77:              mainForm.append("网络错误");

 78:              e.printStackTrace();

 79:          } finally {

 80:              // 关闭连接对像

 81:              if (iStrm != null) {

 82:                  iStrm.close();

 83:              }

 84:              if (http != null) {

 85:                  http.close();

 86:              }

 87:          }

 88:  

 89:      }

 90:  

 91:      public void commandAction(Command c, Displayable d) {

 92:          if (c == exitCommand) {

 93:              try {

 94:                  destroyApp(false);

 95:                  notifyDestroyed();

 96:              } catch (MIDletStateChangeException e) {

 97:                  // TODO Auto-generated catch block

 98:                  e.printStackTrace();

 99:              }

100:          }

101:      }

102:  

103:  }

104:  

POST方式与服务器交互（客户端）：

  1:  import java.io.IOException;

  2:  import java.io.InputStream;

  3:  import java.io.OutputStream;

  4:  

  5:  import javax.microedition.io.Connector;

  6:  import javax.microedition.io.HttpConnection;

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2010-04-20 22:53
      
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