Java 手机与空间制图服务应用集成

 
package untitled9;  
import java.io.*; 
import java.util.*; 
import javax.microedition.midlet.*; 
import javax.microedition.lcdui.*; 
import javax.microedition.rms.*; 
import javax.microedition.io.*; 

public class Untitled0 
    extends MIDlet 
    implements CommandListener, ItemStateListener { 

  Display display; 
  Canvas canvas0; 
  // Custom declaration code starts here 

  public Untitled0() { 
    display = Display.getDisplay(this); 
    canvas0 = new Canvas() { 
      public void paint(Graphics g) { 
        HttpConnection content = null; 
        byte[] contents = null; 
        try { 
          content = (HttpConnection)  
Connector.open("http://localhost:8080/wmsserver111/servlet/wms?
VERSION=1.1.1&SRS=epsg:4267&REQUEST=GetMap&LAYERS=Layers/Beijing/
Road&STYLES=&BBOX=-180,-180,180,180&WIDTH=
120&HEIGHT=120&FORMAT=image/png"); 
/************************************************************************ 
通过 Http 协议建立连接 content 对象，取得 GIS 图像数据文件的长度；然后， 
按照该文件的长度构造缓冲区 kkk[]；由 content 对象获取输入流， 
将数据输入流与数据输入流连接，将 GIS 图像数据文件的数据读入缓冲区 kkk[]， 
由 kkk[]缓冲区构造静态 GIS 图像对象me=Image.createImage(kkk,0,kkk.length); 
这样就可以构造出静态 GIS 图像，从而就可以使用任何绘图语句将图像在 J2ME 手机屏幕上。 
图像的显示：建立一个画布 Canvas，在 Canvas 的 paint 事件中，加入如下代码： 
g.drawImage(me,0, 0, Graphics.LEFT| Graphics.TOP); 

*************************************************************************/ 
try { 
    DataInputStream _in = new DataInputStream(content.openInputStream()); 
        _in.available(); 
        int _length = (int) content.getLength(); 
if (_length < 1) { 
          _length = _in.available(); 
          System.out.println(_length); 
          } 
        contents = new byte[_length]; 
        _in.readFully(contents); 
        _in.close(); 
        System.out.println(contents.length); 
        Image img = Image.createImage(contents, 0, contents.length - 1); 
        g.drawImage(img, 0, 0, g.LEFT | g.TOP); 
          } 
          catch (IOException except) { 
            except.printStackTrace(); 
          } 
        } 
        catch (IOException excpt0) { 
          excpt0.printStackTrace(); 
        } 
} 
      { 
        this.addCommand(new Command("command1", 
 Command.SCREEN, 1)); 
        setCommandListener(Untitled0.this); 
      } 
    }; 
    // Custom constructor code starts here 
  } 
  public void startApp()  
throws MIDletStateChangeException  
{ 
    display.setCurrent(canvas0); 
  } 
  public void pauseApp() { 
  } 
  public void destroyApp(boolean unconditional) throws 
      MIDletStateChangeException { 
  } 
  public void itemStateChanged(Item item) { 
  } 
  public void commandAction(Command c, Displayable d) { 
    if (c.getLabel().equals("command1") && d == canvas0) { 
} 
} 
} 

 
／／定义RMS 数据对象 
RecordStore rs = null; 
RecordEnumeration rs_enum = null; 
try { 
／／创建或打开 RMS 内部数据库"GIS" 
 rs = RecordStore.openRecordStore("gis",true); 
 rs_enum = rs.enumerateRecords(null,null,false); 
} 
catch ( RecordStoreFullException excpt0 ) { 
} 
catch ( RecordStoreNotFoundException excpt1 ) { 
} 
catch ( RecordStoreException excpt2 ) { 
} 
try { 
／／将 J2ME 手机网络获取的图像文件数据写入数据库 
 rs.addRecord(kkk,0,kkk.length); 
} 
catch ( RecordStoreNotOpenException excpt0 ) { 
} 
catch ( RecordStoreFullException excpt1 ) { 
} 
catch ( RecordStoreException excpt2 ) { 
} 
….. 

 
byte[] gisData = null; 
try { 
 gisData = getRecord(0); 
} 
catch ( InvalidRecordIDException excpt0 ) { 
} 
catch ( RecordStoreNotOpenException excpt1 ) { 
} 
catch ( RecordStoreException excpt2 ) { 
} 
…. 
me=Image.createImage(gisData,0, gisData.length); 
……