使用jackson处理json数据
maven中的配置，这里没有写版本信息 <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-core-asl</artifactId> </dependency> <dependency> <groupId>org.codehaus.jackson</groupId> <artifactId>jackson-mapper-asl</artifactId> </dependency>
工具类
package opstools.vtm.support.utils; import org.codehaus.jackson.map.ObjectMapper; import org.codehaus.jackson.type.TypeReference; public class JsonSupportUtils { public final static ObjectMapper jsonMapper = new ObjectMapper(); public static String serialize(Object object) throws Exception{ return jsonMapper.writeValueAsString(object); } public static <T> T deserialize(String str, Class<T> valueType) throws Exception{ return (T)jsonMapper.readValue(str, valueType); } public static <T> T deserialize(String str, TypeReference valueTypeRef) throws Exception{ return (T)jsonMapper.readValue(str, valueTypeRef); } }
测试使用
-->Service层的某个类
@SuppressWarnings("unchecked")
@Override
public String getDicByCodeAndFactoryValue(String code,String factoryValue) throws Exception{
//改成JSON格式的
List<Object[]> result= (List<Object[]>) dicdao.getDicByCodeAndFactoryValue(code,factoryValue);
List<ResourceValue> rvs=new ArrayList<ResourceValue>();
if(result!=null && result.size()>0){
for(Object[] obj:result){
rvs.add(new ResourceValue(obj[0],obj[1]));
}
return JsonSupportUtils.serialize(rvs);
}
return null;
}
-->Action层的某个类
/** * 从字典中获取设备型号信息(依据设备厂商信息) * @return * @throws Exception */ public void getDeviceTypeJSON() throws Exception{ String factory=request.getParameter("factory"); if(factory!=null){ //根据厂商信息加载设备型号 String result=dicService.getDicByCodeAndFactoryValue(DIC_DEVICE_MODEL, factory);
//设置json格式 response.setContentType("text/json;charset=UTF-8"); response.getWriter().write(result); } }
-->前台界面层的处理，这里是用jquery处理的js
<%@ page language="java" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> ......
/**
*下拉框的级联操作
*/
<script type="text/javascript" > $(document).ready(function(){ $("#deviceFactory").on("change",function(event){ $.post("deviceInfo!getDeviceTypeJSON.jspa", {factory:$(this).val()}, function(data){ if(data!=null){ //1，清空设备型号内部元素 $("#deviceType").empty(); //2，增加提示信息 $("#deviceType").append("<option value=''>请选择</option>"); for(var i=0;i<data.length;i++){ //添加新数据 var option="<option value='"+data[i].realValue+"'>"+data[i].displayValue+"</option>"; $("#deviceType").append(option); } } },"json"); }); }) </script> </head> <body ...... <s:form id="MYFORM" action="%{pageAction}" method="post" theme="simple"> <div id="content"> <table> ...... <tr> <th width="17%">设备厂商:</th> <td width="35%"><s:select name="deviceInfo.factory" id="deviceFactory" list="deviceFactoryList" listKey="realValue" listValue="displayValue" headerKey="" headerValue="请选择"/> </td> <th width="13%">设备型号:</th> <td width="35%"><s:select name="deviceInfo.deviceNo" id="deviceType" list="deviceTypeList" listKey="realValue" listValue="displayValue" headerKey="" headerValue="请选择"/> </td> </tr> </table> </div> </s:form> </body> </html>
