基于J2ME的联网心理测试

1. 提供给客户端测试试题的Servlet程序IQTest代码：

package com.Test;

import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStream;

import javax.naming.InitialContext;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class IQTest extends HttpServlet ...{

    /** *//**
     * 
     */
    private static final long serialVersionUID = 6521059720875972304L;
    
    protected static final String DBName = "java:/DefaultDS";
    private DataSource dataSource;
    //初始化数据库连接池
    public void init(ServletConfig config) throws ServletException ...{
        try ...{
            InitialContext ic = new InitialContext();
            //打开一个连接池
            dataSource = (DataSource) ic.lookup(DBName);
        } catch (Exception e) ...{
            e.printStackTrace();
            throw new ServletException("init error");
        }
    }
    
    //处理Post申请
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException ...{
        
        String question = null;
        Connection c;
        
        //设置为按字节传输
        response.setContentType("application/octet-stream");
        OutputStream os = response.getOutputStream();
        //创建一个输出流对象
        DataOutputStream dos = new DataOutputStream(os);
        try ...{
            c = dataSource.getConnection();
            //获得问题的数目
            PreparedStatement ps1 = c.prepareStatement("select count(*) as rowcount from iqquestion");
            //执行查询
            ResultSet rs1 = ps1.executeQuery();
            rs1.next();
            int num = rs1.getInt("rowcount");
            rs1.close();
            ps1.close();
            //获得问题内容
            PreparedStatement ps2 = c.prepareStatement("select * from iqquestion");
            ResultSet rs2 = ps2.executeQuery();
            
            //发送问题的数目
            dos.writeInt(num);
            System.out.println(num);
            while (rs2.next()) ...{
                question = rs2.getString("question");
                System.out.println(question);
                //发送问题的内容
                dos.writeUTF(question);
            }
            //释放资源
            rs2.close();
            ps2.close();
            c.close();
        } catch (SQLException e) ...{
            e.printStackTrace();
        }
        //设置发送的所有数据的流量属性
        response.setContentLength(dos.size());
        dos.close();
        os.close();
    }
    
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException ...{
        
        doPost(request, response);
    }
}

 

2. 客户端传过来的试题答案，客户姓名和编号的Servlet程序的IQAnswer代码：

 

package com.Test;

import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.PreparedStatement;

import javax.naming.InitialContext;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.DataSource;

public class IQAnswer extends HttpServlet ...{

    /** *//**
     * 
     */
    private static final long serialVersionUID = -827875086373603144L;
    
    protected static final String DBName = "java:/DefaultDS";
    private DataSource dataSource;
    //初始化数据库连接池
    public void init(ServletConfig config) throws ServletException ...{
        try ...{
            InitialContext ic = new InitialContext();
            //打开一个连接池
            dataSource = (DataSource) ic.lookup(DBName);
        } catch (Exception e) ...{
            e.printStackTrace();
            throw new ServletException("init error");
        }
    }
    
    //处理Post申请
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException ...{
        
        byte[] data = null;
        InputStream iStrm = null;
        iStrm = request.getInputStream();
        int length = request.getContentLength();
        if (length > 0) ...{    //如果存在传过来的数据
            data = new byte[length];
            iStrm.read(data);
        }
        //反序列化数据
        Person person = new Person();
        person.deserialize(data);
        //向数据库添加数据
        Connection c;
        try ...{
            c = dataSource.getConnection();
            PreparedStatement ps = c.prepareStatement(
                    "insert into storeanswer values(?,?,?)");
            ps.setString(1, person.get_userid());
            ps.setString(2, person.get_name());
            ps.setString(3, person.get_answer());
            ps.executeUpdate();
            
            ps.close();
            c.close();
            
        } catch (SQLException e) ...{
            e.printStackTrace();
        }
    }
    
    //处理Get请求
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException ...{
    
        doPost(request, response);
    }
}

 

3. 把上面两个Servlet程序发布到JBoss服务器上，具体就是在web.xml文件中添加Servlet的XML信息

 

<servlet>
    <servlet-name>IQAnswer</servlet-name>
    <servlet-class>com.Test.IQAnswer</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>IQAnswer</servlet-name>
    <url-pattern>/IQAnswer</url-pattern>
</servlet-mapping>
<servlet>
    <servlet-name>IQTest</servlet-name>
    <servlet-class>com.Test.IQTest</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>IQTest</servlet-name>
    <url-pattern>/IQTest</url-pattern>
</servlet-mapping>

 

4. 客户端程序：

 

//***********************************HttpIQTest.java
package chapter15;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;
import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Form;
import javax.microedition.lcdui.Item;
import javax.microedition.lcdui.StringItem;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class HttpIQTest extends MIDlet implements CommandListener ...{
    private Display display;
    private Form mainForm;
    private Command exitCommand, connectCommand, backCommand, sendCommand;
    private TextField useridField, usernameField;
    private String userid, username;
    
    public HttpIQTest() ...{
        display = Display.getDisplay(this);
        
        exitCommand = new Command("Exit", Command.EXIT, 1);
        connectCommand = new Command("Connect", Command.SCREEN, 1);
        backCommand = new Command("Back", Command.BACK, 1);
        sendCommand = new Command("Send", Command.SCREEN, 1);
        
        mainForm = new Form("服务器的信息");
        
        useridField = new TextField("输入用户编号", null, 25, TextField.NUMERIC);
        usernameField = new TextField("输入用户姓名", null, 25, TextField.ANY);
        //收集界面上输入用户编号和姓名
        mainForm.append(useridField);
        mainForm.append(usernameField);
        
        mainForm.addCommand(exitCommand);
        mainForm.addCommand(connectCommand);
        mainForm.setCommandListener(this);
        
    }

    protected void startApp() throws MIDletStateChangeException ...{
        display.setCurrent(mainForm);
    }

    protected void pauseApp() ...{
        
    }

    protected void destroyApp(boolean arg0) throws MIDletStateChangeException ...{
        
    }

    public void commandAction(Command c, Displayable d) ...{
        if (c == exitCommand) ...{
            try ...{
                destroyApp(false);
            } catch (MIDletStateChangeException e) ...{
                e.printStackTrace();
            }
            notifyDestroyed();
        }
        if (c == connectCommand) ...{
            userid = useridField.getString();
            username = usernameField.getString();
            if(userid.length() == 0 && username.length() == 0) ...{
                Alert a = new Alert("警告", "姓名和编号不能都为空", null, AlertType.ERROR);
                a.setTimeout(Alert.FOREVER);
                display.setCurrent(a);
                return;
            }
            Thread t = new Thread() ...{
                public void run() ...{
                    //访问服务器servlet
                    try ...{
                        getQuestion();
                    } catch (Exception e) ...{
                        System.out.println(e.toString());
                    }
                }
            };
            t.start();
        }
        if (c == backCommand) ...{
            display.setCurrent(mainForm);
        }
        if (c == sendCommand) ...{
            Thread t = new Thread() ...{
                public void run() ...{
                    try ...{
                        sendAnswer();
                        display.setCurrent(mainForm);
                    } catch (IOException e) ...{
                        
                        System.out.println(e.toString());
                    }
                }
            };
            t.start();
        }
    }
    
    //联网获得测试内容
    public void getQuestion() throws IOException ...{
        HttpConnection conn = null;
        InputStream iStrm = null;
        String url = "http://127.0.0.1:8084/IQTest";
        
        Form f;
        f = new Form("请解答");
        f.addCommand(backCommand);
        f.addCommand(sendCommand);
        f.setCommandListener(this);
        
        try ...{
            //创建httpconnection连接
            conn = (HttpConnection) Connector.open(url);
            conn.setRequestMethod(HttpConnection.POST);
            //设置连接属性
            conn.setRequestProperty("User-Agent", "Profile/MIDP-2.0 Configuration/CLDC-1.1");
            conn.setRequestProperty("Content-Language", "en-US");
            conn.setRequestProperty("Content-Type", "application/octet-stream");
            conn.setRequestProperty("Accept", "application/octet-stream");
            conn.setRequestProperty("Connection", "Keep-Alive");
            //如果连接成功
            if (conn.getResponseCode() == HttpConnection.HTTP_OK) ...{
                iStrm = conn.openInputStream();
                DataInputStream dis = new DataInputStream(iStrm);
                //获得数据信息
                int length = (int) conn.getLength();
                
                if (length > 0) ...{
                    //读取传过来的题目数
                    int num = dis.readInt();
                    System.out.println(num);
                    
                    String question;
                    for (int i = 0; i < num; i++) ...{
                        question = dis.readUTF();
                        //显示返回来的信息
                        f.append(new StringItem("第 " + i + " 题:  ", question));
                        f.get(i).setLayout(Item.LAYOUT_EXPAND | Item.LAYOUT_NEWLINE_AFTER);
                    }
                } else ...{
                    f.append("不能访问数据");
                }
            }
            display.setCurrent(f);
        } catch (Exception e) ...{
            f.append("网络出错！");
            System.out.println(e.toString());
        } finally ...{
            if (iStrm != null) ...{
                iStrm.close();
            }
            if (conn != null) ...{
                conn.close();
            }
        }
    }
    
    //发送答案
    public void sendAnswer() throws IOException ...{
        HttpConnection conn = null;
        OutputStream oStrm = null;
        String url = "http://127.0.0.1:8084/IQAnswer";
        
        try ...{
            //创建httpconnection连接
            conn = (HttpConnection) Connector.open(url);
            conn.setRequestMethod(HttpConnection.POST);
            //设置连接属性
            conn.setRequestProperty("User-Agent", "Profile/MIDP-2.0 Configuration/CLDC-1.1");
            conn.setRequestProperty("Content-Language", "en-US");
            conn.setRequestProperty("Content-Type", "application/octet-stream");
            conn.setRequestProperty("Accept", "application/octet-stream");
            conn.setRequestProperty("Connection", "Keep-Alive");
            
            Person personIn = new Person(userid, username, "ABCDAB");//ABCDAB是答案
            byte[] data = personIn.serialize();
            conn.setRequestProperty("Content-Length", Integer.toString(data.length));
            
            oStrm = conn.openOutputStream();
            oStrm.write(data);
            //提示答案成功发送
            Alert a = new Alert("提示", "发送成功", null, AlertType.INFO);
            a.setTimeout(Alert.FOREVER);
            display.setCurrent(a);
            
        } catch (Exception e) ...{
            System.out.println(e.toString());
        } finally ...{
            if (oStrm != null) ...{
                oStrm.close();
            }
            if (conn != null) ...{
                conn.close();
            }
        }
    }

}


//******************************Person.java
package chapter15;

import java.io.*;
import java.io.IOException;

public class Person implements KSerializable ...{
    private String _name;
    private String _answer;
    private String _userid;
    
    public Person() ...{
        
    }
    
    public Person(String userid, String name, String answer) ...{
        _userid = userid;
        _answer = answer;
        _name = name;
    }
    
    public String get_answer() ...{
        return _answer;
    }

    public void set_answer(String _answer) ...{
        this._answer = _answer;
    }

    public String get_name() ...{
        return _name;
    }

    public void set_name(String _name) ...{
        this._name = _name;
    }

    public String get_userid() ...{
        return _userid;
    }

    public void set_userid(String _userid) ...{
        this._userid = _userid;
    }

    public byte[] serialize() throws IOException ...{
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        DataOutputStream dout = new DataOutputStream(bout);
        dout.writeUTF(_userid);
        dout.writeUTF(_name);
        dout.writeUTF(_answer);
        
        return bout.toByteArray();
    }

    public void deserialize(byte[] data) throws IOException ...{
        ByteArrayInputStream bin = new ByteArrayInputStream(data);
        DataInputStream din = new DataInputStream(bin);
        _userid = din.readUTF();
        _name = din.readUTF();
        _answer = din.readUTF();
    }

}


//*****************************KSerializable.java
package chapter15;

import java.io.IOException;

public interface KSerializable ...{
    byte[] serialize() throws IOException;
    void deserialize(byte[] data) throws IOException;
}