ArcIMS结合struts进行webGIS开发

<clk></clk>arcIMS的客户端<nobr oncontextmenu="return false;" onmousemove="kwM(1);" id="clickeyekey1" onmouseover="kwE(event,1, this);" style="COLOR: #6600ff; BORDER-BOTTOM: #6600ff 1px dotted; BACKGROUND-COLOR: transparent; TEXT-DECORATION: underline" onclick="return kwC(event,1)" onmouseout="kwL(event, this);" target="_1">开发</nobr>模式分HTML Viewer和Java Viewer两种，Java Viewer由于需要在客户端安装JRE，在webGIS开发中已经被一棒打死。而arcIMS提供的HTML Viewer中，大量处理地图的代码都是用JavaScript编写，界面代码和业务处理代码大量的混杂在一起，调试起来很不方便。利用struts对arcIMS请求代码进行封装，实现了业务代码和界面代码的分离。进行<nobr oncontextmenu="return false;" onmousemove="kwM(7);" id="clickeyekey7" onmouseover="kwE(event,7, this);" style="COLOR: #6600ff; BORDER-BOTTOM: #6600ff 1px dotted; BACKGROUND-COLOR: transparent; TEXT-DECORATION: underline" onclick="return kwC(event,7)" onmouseout="kwL(event, this);" target="_1">JSP</nobr>开发时，利用可中MVC框架使得开发起来非常便利。比较有名的MVC框架有struts,spring等。简单，快捷的Struts是应用最广泛的一个。

（1）在struts中新建一个action
<action-mappings >
<action
attribute="requestMapForm"
input="/index1.jsp"
name="requestMapForm"
path="/requestMap"
scope="request"
type="com.suzhou.struts.action.RequestMapAction" />
</action-mappings>
（2）在map.jsp中新建一个form，对应这个action，记住，struts的<url-pattern>必须设置成*.do的格式（在web.xml中设置），如果设置成/do/*格式，多次请求这个action会出现找不到action的错误。

字串5

<FORM action="requestMap.do" name="requestMapForm">
<INPUT type="submit" value="确定"/>
</FORM>
（3）编写action代码

字串1

代码
package com.suzhou.struts.action;

import <clk></clk>javax.servlet.<nobr oncontextmenu="return false;" onmousemove="kwM(2);" id="clickeyekey2" onmouseover="kwE(event,2, this);" style="COLOR: #6600ff; BORDER-BOTTOM: #6600ff 1px dotted; BACKGROUND-COLOR: transparent; TEXT-DECORATION: underline" onclick="return kwC(event,2)" onmouseout="kwL(event, this);" target="_1">http</nobr>.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; 字串6

import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;

字串7

import com.esri.aims.mtier.io.ConnectionProxy;
import com.esri.aims.mtier.model.map.Map;
import com.suzhou.struts.form.RequestMapForm;

/***/ /** 字串8
*MyEclipseStruts
*Creationdate:03-29-2006
*
*XDocletdefinition:
*@struts.actionpath="/requestMap"name="requestMapForm"input="jspForm.jsp"scope="request"validate="true"
*/
public class RequestMapAction extends Action {

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// ---------------------------------------------------------InstanceVariables

// ---------------------------------------------------------Methods

/***/ /**

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*Methodexecute
* @param mapping
* @param form
* @param request
* @param response
* @return ActionForward

字串4

*/
public ActionForwardexecute(
ActionMappingmapping,
ActionFormform,
HttpServletRequestrequest,
HttpServletResponseresponse) { 字串5
RequestMapFormrequestMapForm = (RequestMapForm)form;
StringstrAction = requestMapForm.getAction();

ConnectionProxyconn = new ConnectionProxy();
conn.setHost( " menglikun " ); // <clk></clk>ArcIMS<nobr oncontextmenu="return false;" onmousemove="kwM(3);" id="clickeyekey3" onmouseover="kwE(event,3, this);" style="COLOR: #6600ff; BORDER-BOTTOM: #6600ff 1px dotted; BACKGROUND-COLOR: transparent; TEXT-DECORATION: underline" onclick="return kwC(event,3)" onmouseout="kwL(event, this);" target="_1">服务</nobr>器的名称或者IP 字串1
conn.setConnectionType(conn.TCP);
conn.setPort( 5300 ); // <clk></clk>ArcIMS<nobr oncontextmenu="return false;" onmousemove="kwM(9);" id="clickeyekey9" onmouseover="kwE(event,9, this);" style="COLOR: #6600ff; BORDER-BOTTOM: #6600ff 1px dotted; BACKGROUND-COLOR: transparent; TEXT-DECORATION: underline" onclick="return kwC(event,9)" onmouseout="kwL(event, this);" target="_1">服务器</nobr>的端口
conn.setService( " zixian " ); // 需要调用的ArcIMS服务器的服务名称
conn.setDisplayMessages( false );

字串5

// 使用Map对象的访问方式
/**/ /*
Mapmap=(Map)request.getSession().getAttribute("gongzhongMap");
if(map==null){ 字串7
//如果Map对象为空，新建一个Map对象
map=newMap();
try{
map.initMap(conn,0,false,false,false,false);
map.refresh();
request.setAttribute("mapURL",map.getMapOutput().getURL());

字串5

request.getSession().setAttribute("gongzhongMap",map);
returnmapping.getInputForward();
}catch(Exceptionex){
System.out.println(ex.getMessage());
ex.printStackTrace(); 字串1
}
}else{
map.refresh();
request.setAttribute("mapURL",map.getMapOutput().getURL());
request.getSession().setAttribute("gongzhongMap",map);
returnmapping.getInputForward();

字串6

}
*/
/**/ /*
*不使用Map对象，直接通过arcXML进行请求的访问方式。
<clk></clk>*这种方式的<nobr oncontextmenu="return false;" onmousemove="kwM(6);" id="clickeyekey6" onmouseover="kwE(event,6, this);" style="COLOR: #6600ff; BORDER-BOTTOM: #6600ff 1px dotted; BACKGROUND-COLOR: transparent; TEXT-DECORATION: underline" onclick="return kwC(event,6)" onmouseout="kwL(event, this);" target="_1">好处</nobr>是可以使用arcXML所有的功能，功能非常强大。

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*但要自己写代码处理arcIMS返回的结果。
*/
StringstrArcXML = " <?xmlversion=/ " 1.0 / " encoding=/ " UTF - 8 / " ?> "

字串7

+ " <ARCXMLversion=/ " 1.1 / " > "
+ " <REQUEST> "
+ " <GET_IMAGE> "

字串9

+ " <PROPERTIES> "
+ " <ENVELOPEminx=/ " - 13.62 / " miny=/ " 33.91 / " maxx=/ " 53.62 / " maxy=/ " 73.33 / " /> "

字串8

+ " <IMAGESIZEwidth=/ " 600 / " height=/ " 400 / " /> "
+ " </PROPERTIES> "

字串8

+ " <LAYERtype=/ " acetate/ " name=/ " acetate/ " id=/ " acetate/ " > "
+ " <OBJECTunits=/ " pixel/ " > " 字串5
+ " <NORTHARROWtype=/ " 4 / " coords=/ " 20 30 / " shadow=/ " 32 , 32 , 32 / " size=/ " 15 / " /> "

字串9

+ " </OBJECT> "
+ " </LAYER> "
+ " </GET_IMAGE> " 字串8
+ " </REQUEST> "
+ " </ARCXML> " ;
try {

字串7

conn.send(strArcXML);
return mapping.getInputForward();
} catch (Exceptionex) {
System.out.println(ex.getMessage()); 字串6
ex.printStackTrace();
}
102 return null ;
103}
104 }