J2ME/J2EE实现用户登录交互 实现代码

import java.io.ByteArrayOutputStream; 
import java.io.DataOutputStream; 
import java.io.IOException; 
import java.io.OutputStream; 
import javax.servlet.ServletException; 
import javax.servlet.http.HttpServlet; 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
/** *//******************************************************************************* 
* 
* @author zdw 
* 
*/ 
@SuppressWarnings("serial") 
public class LoginServlet extends HttpServlet 
{ 
public void doGet(HttpServletRequest request, HttpServletResponse response) 
throws ServletException, IOException 
{ 
this.doPost(request, response); 
} 
public void doPost(HttpServletRequest request, HttpServletResponse response) 
throws ServletException, IOException 
{ 
// 得到客户端传入的数据(用户名和密码) 
String username = request.getParameter("username"); 
String password = request.getParameter("password"); 
// 构建输出流 
ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
DataOutputStream dos = new DataOutputStream(baos); 
// 逻辑操作(这里写你的逻辑判断) 
if ("zdw".equals(username) && "admin".equals(password)) 
{ 
// 响应数据 
dos.writeUTF("true"); 
} else 
{ 
// 响应数据 
dos.writeUTF("false"); 
} 
// 
byte[] data = baos.toByteArray(); 
// 设置服务器响应参数 
response.setStatus(HttpServletResponse.SC_OK); 
response.setContentLength(data.length); 
response.setContentType("application/octet-stream"); 
OutputStream os = response.getOutputStream(); 
os.write(data); 
os.close(); 
} 
}