arcims 两种连接方式(java connector,servlet connector)

(1) java connector主要是利用ims自封装的一些java类（ConnectionProxy,Map）来实现，通过api方法进行调用，
     举例如下：
  
    ConnectionProxy mapCon=new ConnectionProxy();
    if(connectiontype.equalsIgnoreCase("http"))
    {
      mapCon.setConnectionType(ConnectionProxy.HTTP);
      URL url = new URL(host);
       mapCon.setUrl(url);
     }
    else if (connectiontype.equalsIgnoreCase("tcp"))
    {
      mapCon.setConnectionType(ConnectionProxy.TCP);
      mapCon.setHost(host);
    }
    mapCon.setPort(port);
    mapCon.setService(datasource);
    mapCon.setDisplayMessages(true);
    map=new Map();
    map.initMap(mapCon,750,false,false,false,false);
   
    map.setHeight(option.getHeight());
    map.setWidth(option.getWidth());
    .................
   
    map.refresh();  
    String mapurl=map.getMapOutput().getURL();
    String legendurl=map.getLegend().getLegendOutput().getURL();
   
    在此过程中，Map对象的方法主要工作为构造arcxml request,并解析arcxml response
    优点：基于api接口实现起来方便易用
    缺点：解析map对象，影响速度。且调用map.refresh()方法，默认为做两次arcims request. 第一次为遍历axl的request，第二次为实际的request.

（2）servlet connector主要通过向servlet地址发送请求，然后获得返回的url流，得到响应
     举例如下：
     String serverUrl="http://localhost:8888/servlet/com.esri.esrimap.Esrimap?ServiceName=SantaClara";
     URL imsURL =new URL(serverUrl);
     URLConnection connection=imsURL.openConnection();   
    connection.setDoOutput(true);
    connection.setDoInput(true);
    BufferedOutputStream bos = new BufferedOutputStream(connection.getOutputStream());
    OutputStreamWriter out = new OutputStreamWriter(bos, "UTF8");
    out.write(arcimsRequest, 0, arcimsRequest.length());
    out.flush();     
    out.close();
    BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF8"));
    String ln;
    String tempString=null;
    while ((ln = in.readLine()) != null)
    {
     if (tempString == null)
     {
        tempString = ln;
     }
     else
     {
        tempString = tempString + ln;
     }
    }
    arcxmlReponseStr = tempString.trim();
   out.close();
   in.close();

  其中arcimsRequest格式如下：

Arcxml request:
<?xml version="1.0" encoding="UTF-8"?>
 <ARCXML version="1.1">
  <REQUEST>
    <GET_IMAGE autoresize="false">
      <ENVIRONMENT>
       <SEPARATORS cs=" " ts=";"/>
      </ENVIRONMENT>
       //scalebar is set
      <LAYER id="8" name="LayerName" type="acetate" visible="true">
       <OBJECT units="pixel">
         <SCALEBAR antialiasing="true" barcolor="255,255,255" bartransparency="1.0" barwidth="12" coords="100.0 3.0" distance="0.0" font="Arial" fontcolor="0,0,0" fontsize="10" fontstyle="regular" mapunits="degrees" mode="cartesian" outline="255,255,255" overlap="true" precision="2" round="0.0" scaleunits="meters" screenlength="40" texttransparency="1.0"/>
       </OBJECT>
      </LAYER>
      <PROPERTIES>
       <ENVELOPE maxx="-121.87677055355464" maxy="37.33222499720282" minx="-121.90701583922555" miny="37.316082232930746"/>
       <IMAGESIZE dpi="750" height="350" scalesymbols="false" width="500"/>
       <BACKGROUND color="215,215,215"/>
       <OUTPUT type="jpg"/>
       <LEGEND antialiasing="false" autoextend="true" cansplit="false" cellspacing="2" columns="1" display="true" font="宋体" height="300" layerfontsize="12" reverseorder="false" splittext="(cont)" swatchheight="14" swatchwidth="18" title="图例" titlefontsize="15" valuefontsize="10" width="125"/>
        <LAYERLIST dynamicfirst="false" nodefault="false" order="true">
         <LAYERDEF id="0" name="boundary" visible="true"/>
         <LAYERDEF id="1" name="tract" visible="true"/>
         <LAYERDEF id="2" name="sc_streets" visible="true"/>
         <LAYERDEF id="3" name="rivers" visible="false"/>
         <LAYERDEF id="4" name="hospital" visible="true"/>
         <LAYERDEF id="5" name="cities" visible="true"/>
         <LAYERDEF id="6" name="topoq24" visible="false"/>
           // scalebar is set
         <LAYERDEF id="8" name="LayerName" visible="true"/>
        </LAYERLIST>
      </PROPERTIES>
    </GET_IMAGE>
  </REQUEST>
</ARCXML>

返回的arcxmlReponseStr ，格式如下：
<?xml version="1.0" encoding="UTF-8"?>
 <ARCXML version="1.1">
  <RESPONSE>
   <IMAGE>
    <ENVELOPE minx="-121.907015839225" miny="37.3135677650819" maxx="-121.876770553554" maxy="37.3347394650516" />
    <OUTPUT file="C:/oc4j/j2ee/home/default-web-app/output/SantaClara_CHXW24002560270.jpg" url="http://chxw:8888/output/SantaClara_CHXW24002560270.jpg" />
    <LEGEND file="C:/oc4j/j2ee/home/default-web-app/output/SantaClara_CHXW24002568263.jpg" url="http://chxw:8888/output/SantaClara_CHXW24002568263.jpg" />
   </IMAGE>
  </RESPONSE>
 </ARCXML>
通过xml parse解析即可得到输出url.
优点：向arcims应用服务器，只需请求arcxml request一次，只需调用自己的建构的arcimsrequest对象,此类对象为开源，可实现自优化
缺点：需要自己定义arcims request 对象，没有java connector简洁明了。
优化：可直接进行socket通信，通过tcp协议实现。