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在基于Spring架构的通用查询系统中用DWR实现查询条件的动态显示

程序员文章站 2022-07-08 09:27:15
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一、首先有必要对通用查询系统做个简单介绍：该系统基于Spring+Hibernate+Struts架构，主要包括查询设计器（查询脚本维护、查询分类排序、查询条件维护、查询类型维护）和信息查询两大功能，其主要目的是为应用于软件项目开发当中，解决其全部查询模块和功能模块的条件部分，以加快项目开发速度。
二、说说系统开发中的难点：第一、在应用于项目当中去时怎样保持自己的独立性，也就是解耦的问题，第二、怎样根据各个项目的特点动态地扩展其跟业务逻辑相关的查询条件，这里就涉及到一个查询条件的动态显示问题。
三、接下去就讲正题，用DWR实现查询条件的动态显示
   1、构建查询条件服务：业务逻辑相关的查询条件就通过实现ICxtjValues接口的插件通过Spring配置文件注入给查询条件服务CxtjService，这样就解决了在解耦的情况下实现查询条件扩展。
CxtjService.java代码： 
package gov.nbgs.sql.service.impl;
import gov.nbgs.common.bean.Entity;
import gov.nbgs.common.dao.IEntityDao;
import gov.nbgs.common.service.impl.EntityService;
import gov.nbgs.sql.plugin.ICxtjValues;
import java.util.Collection;
import java.util.Map;
import org.apache.log4j.Logger;

public class CxtjService extends EntityService {
	/**
	 * Logger for this class
	 */
	private static final Logger logger = Logger.getLogger(CxtjService.class);
	private Map cxtjValuesMap;
	protected IEntityDao getDao(Entity arg0) {
		return null;
	}
	public Map getCxtjValuesMap() {
		return cxtjValuesMap;
	}
	public void setCxtjValuesMap(Map cxtjValuesMap) {
		this.cxtjValuesMap = cxtjValuesMap;
	}
	public Collection getCollectionCxtjValues(String key) {
		if (logger.isDebugEnabled()) {
			logger.debug("getCollectionCxtjValues(String)=>"+key);
		}
		ICxtjValues cxtjValues = (ICxtjValues)this.getCxtjValuesMap().get(key);
		if(cxtjValues==null) return null;
		if (logger.isDebugEnabled()) {
			logger.debug("getCollectionCxtjValues(String)=>"+cxtjValues.getCollectionCxtjValues().size());
		}
		return cxtjValues.getCollectionCxtjValues();
	}
	public Map getMapCxtjValues(String key) {
		if (logger.isDebugEnabled()) {
			logger.debug("getCxtjValuesMap(String)=>"+key);
		}
		ICxtjValues cxtjValues = (ICxtjValues)this.getCxtjValuesMap().get(key);
		if(cxtjValues==null) return null;
		if (logger.isDebugEnabled()) {
			logger.debug("getCxtjValuesMap(String)=>"+cxtjValues.getMapCxtjValues().size());
		}
		return cxtjValues.getMapCxtjValues();
	}	
}


Spring相关配置： 
<beans default-autowire="byName">
  <bean id="swjgCxtjValues" class="gov.nbgs.demo.plugin.SwjgCxtjValues"/>  
  <bean id="cxtjService" class="gov.nbgs.sql.service.impl.CxtjService">
    <property name="cxtjValuesMap">
      <map>
        <entry key="dddd">
          <ref bean="swjgCxtjValues"/>
        </entry>  
        <entry key="djzclxdm">
          <ref bean="swjgCxtjValues"/>
        </entry>             
      </map>
    </property>        
  </bean>
</beans>


DWR配置文件： 
<!DOCTYPE dwr PUBLIC
    "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN"
    "http://www.getahead.ltd.uk/dwr/dwr10.dtd">
<dwr>
	<allow>	
		<convert converter="bean"
			match="org.apache.struts.util.LabelValueBean" />
		<create creator="spring" javascript="CxtjService">
			<param name="beanName">cxtjService</param>
			<include method="getCollectionCxtjValues" />
			<include method="getMapCxtjValues" />
		</create>
	</allow>
</dwr>


查询条件显示CxLayout.jsp部分代码： 
<%@ page contentType="text/html; charset=gb2312"%>
<%@ taglib uri="struts-bean" prefix="bean"%>
<%@ taglib uri="struts-html" prefix="html"%>
<%@ taglib uri="struts-logic" prefix="logic"%>
<%@ taglib uri="struts-tiles" prefix="tiles"%>

<jsp:useBean id="cxtjForm" scope="session"
	class="gov.nbgs.sql.web.form.CxtjForm" />

<html:html>
<head>
<title><tiles:getAsString name="title" /></title>

<script src='dwr/interface/CxtjService.js'></script>
<script src='dwr/engine.js'></script>
<script src='dwr/util.js'></script>
<script>
  var cxtjAreaId = "cxtjArea";
  var cxtjTagName = "span";
  
  function onload() {   
    var cxtjList = getPluginCxtjList();
    for(var i = 0; i < cxtjList.length; i++){
      var cxtj = cxtjList[i];
      var cxtjId = cxtj.cxtjId;        
      CxtjService.getMapCxtjValues(cxtjId, {
  	  		callback:function(dataFromServer) {
    			populateCxtjValues(dataFromServer, cxtj);
  			},
  			async:false
	  });      
    }
  }  
  
  function getPluginCxtjList() { 
    var result = new Array();
  
    var cxtjArea = document.getElementById(cxtjAreaId);
   
    var cxtjTagList = document.getElementsByTagName(cxtjTagName);
    //alert("cxtjTagList.length=>" + cxtjTagList.length);
    
    for(var i = 0; i < cxtjTagList.length; i++){
      var cxtjTag = cxtjTagList[i];
      //alert("cxtjTag.className=>" + cxtjTag.className);
      if(cxtjTag.className=="PluginCxtj"){
        var cxtjId = cxtjTag.childNodes[0].nodeValue;
        var cxtjTagId = cxtjTag.id;
        var cxtjType = cxtjTag.getAttribute("type");
        //alert("cxtjType=>" + cxtjType);
        
        var cxtj = {cxtjId: cxtjId, cxtjTagId: cxtjTagId, cxtjType: cxtjType};
        result[result.length] = cxtj;       		
      }
    }
    return result;
  }

  function createCxtjObject(cxtjId,cxtjTagId,cxtjType){
    var select = document.createElement("select");
    select.setAttribute("id",cxtjId);

    var tagCxtj = document.getElementById(cxtjTagId);
    tagCxtj.removeChild(tagCxtj.childNodes[0]);
    tagCxtj.appendChild(select);
  }    

  function createCxtjInputBox(dataFromServer,cxtjId,cxtjTagId,cxtjType){
    var tagCxtj = document.getElementById(cxtjTagId);
    tagCxtj.removeChild(tagCxtj.childNodes[0]);
    var i = 0;
    for (var key in dataFromServer) {
      var val = dataFromServer[key];
      //alert(key + "=" + val);
      var input_id = cxtjId + "_" + i;
      //alert(input_id);
      if(cxtjType=='radio'){
        var input = createElement("input", cxtjId);   
      }else{
        var input = createElement("input", input_id); 
      } 
      input.setAttribute("type",cxtjType); 
      input.setAttribute("value",key); 
      input.setAttribute("id",input_id);
      tagCxtj.appendChild(input);
      
      var label = document.createElement("label");
      label.setAttribute("for",input_id);
      label.appendChild(document.createTextNode(val));    
      tagCxtj.appendChild(label);  
      
      i++;
    }         
  }    
       
  function populateCxtjValues(dataFromServer, cxtj){  
    var cxtjId = cxtj.cxtjId;
    var cxtjTagId = cxtj.cxtjTagId;
    var cxtjType = cxtj.cxtjType;  
    if(cxtjType=='select'){
      createCxtjObject(cxtjId,cxtjTagId,cxtjType);
      DWRUtil.removeAllOptions(cxtjId);
      DWRUtil.addOptions(cxtjId, dataFromServer);      
    }else{
      createCxtjInputBox(dataFromServer,cxtjId,cxtjTagId,cxtjType);
    }
  }
  
  function createElement(type, name) {
    var element = null;

    try {
      // First try the IE way; if this fails then use the standard way
      element = document.createElement('<'+type+' name="'+name+'">');
    } catch (e) {
      // Probably failed because we’re not running on IE
    }
    if (!element) {
      element = document.createElement(type);
      element.name = name;
    }
    return element;
  }      
</script>
</head>
<body onload="onload()">
................
................
  <div id="cxtjArea">	
    <logic:present name="cxtjForm" property="cxtjMap">
    <bean:define id="cxtjMap" name="cxtjForm" property="cxtjMap" type="java.util.Map" />
    <logic:iterate id="cxtj" name="cxtjMap">
      <tr class=jnfont1>
 	 <td><bean:write name="cxtj" property="key"/></td>
 	 <td>
 	      <bean:define id="cxtjvalue" name="cxtj" property="value"/>
 	       <% out.println(cxtjvalue); %>
 	 </td>
       </tr>
     </logic:iterate> 
    </logic:present>	
  </div>
..................
.................
</body>
</html:html>


四、初次写技术博客文章，不当之处望各位网友提醒指正！
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