使用POST和GET方法与servlet通信 |
| 作者：java2s 来源：java2s 发布时间：2006-7-25 8:58:07 |
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/*-------------------------------------------------- * GetNpost.java * * Use GET or POST to communicate with a Java servlet. * The servlet will search a database for the balance * of an account. * * Example from the book: Core J2ME Technology * Copyright John W. Muchow http://www.CoreJ2ME.com * You may use/modify for any non-commercial purpose *-------------------------------------------------*/ import javax.microedition.midlet.*; import javax.microedition.lcdui.*; import javax.microedition.io.*; import java.io.*; public class GetNpost extends MIDlet implements CommandListener { private Display display; // Reference to Display object private Form fmMain; // The main form private Alert alError; // Alert to error message private Command cmGET; // Request method GET private Command cmPOST; // Request method Post private Command cmExit; // Command to exit the MIDlet private TextField tfAcct; // Get account number private TextField tfPwd; // Get password private StringItem siBalance;// Show account balance private String errorMsg = null; public GetNpost() { display = Display.getDisplay(this); // Create commands cmGET = new Command("GET", Command.SCREEN, 2); cmPOST = new Command("POST", Command.SCREEN, 3); cmExit = new Command("Exit", Command.EXIT, 1); // Textfields tfAcct = new TextField("Account:", "", 5, TextField.NUMERIC); tfPwd = new TextField("Password:", "", 10, TextField.ANY | TextField.PASSWORD); // Balance string item siBalance = new StringItem("Balance: $", ""); // Create Form, add commands & componenets, listen for events fmMain = new Form("Account Information"); fmMain.addCommand(cmExit); fmMain.addCommand(cmGET); fmMain.addCommand(cmPOST); fmMain.append(tfAcct); fmMain.append(tfPwd); fmMain.append(siBalance); fmMain.setCommandListener(this); } public void startApp() { display.setCurrent(fmMain); } public void pauseApp() { } public void destroyApp(boolean unconditional) { } public void commandAction(Command c, Displayable s) { if (c == cmGET || c == cmPOST) { try { if (c == cmGET) lookupBalance_withGET(); else lookupBalance_withPOST(); } catch (Exception e) { System.err.println("Msg: " + e.toString()); } } else if (c == cmExit) { destroyApp(false); notifyDestroyed(); } } /*-------------------------------------------------- * Access servlet using GET *-------------------------------------------------*/ private void lookupBalance_withGET() throws IOException { HttpConnection http = null; InputStream iStrm = null; boolean ret = false; // Data is passed at the end of url for GET String url = "http://www.mycgiserver.com/servlet/corej2me.GetNpostServlet" + "?" + "account=" + tfAcct.getString() + "&" + "password=" + tfPwd.getString(); try { http = (HttpConnection) Connector.open(url); //---------------- // Client Request //---------------- // 1) Send request method http.setRequestMethod(HttpConnection.GET); // 2) Send header information - none // 3) Send body/data - data is at the end of URL //---------------- // Server Response //---------------- iStrm = http.openInputStream(); // Three steps are processed in this method call ret = processServerResponse(http, iStrm); } finally { // Clean up if (iStrm != null) iStrm.close(); if (http != null) http.close(); } // Process request failed, show alert if (ret == false) showAlert(errorMsg); } /*-------------------------------------------------- * Access servlet using POST *-------------------------------------------------*/ private void lookupBalance_withPOST() throws IOException { HttpConnection http = null; OutputStream oStrm = null; InputStream iStrm = null; boolean ret = false; // Data is passed as a separate stream for POST (below) String url = "http://www.mycgiserver.com/servlet/corej2me.GetNpostServlet"; try { http = (HttpConnection) Connector.open(url); oStrm = http.openOutputStream(); //---------------- // Client Request //---------------- // 1) Send request type http.setRequestMethod(HttpConnection.POST); // 2) Send header information. Required for POST to work! http.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); // If you experience connection/IO problems, try // removing the comment from the following line // http.setRequestProperty("Connection", "close"); // 3) Send data/body // Write account number byte data[] = ("account=" + tfAcct.getString()).getBytes(); oStrm.write(data); // Write password data = ("&password=" + tfPwd.getString()).getBytes(); oStrm.write(data); // For 1.0.3 remove flush command // See the note at the bottom of this file // oStrm.flush(); //---------------- // Server Response //---------------- iStrm = http.openInputStream(); // Three steps are processed in this method call ret = processServerResponse(http, iStrm); } finally { // Clean up if (iStrm != null) iStrm.close(); if (oStrm != null) oStrm.close(); if (http != null) http.close(); } // Process request failed, show alert if (ret == false) showAlert(errorMsg); } /*-------------------------------------------------- * Process a response from a server *-------------------------------------------------*/ private boolean processServerResponse(HttpConnection http, InputStream iStrm) throws IOException { //Reset error message errorMsg = null; // 1) Get status Line if (http.getResponseCode() == HttpConnection.HTTP_OK) { // 2) Get header information - none // 3) Get body (data) int length = (int) http.getLength(); String str; if (length != -1) { byte servletData[] = new byte[length]; iStrm.read(servletData); str = new String(servletData); } else // Le |
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