json-java处理-jackson

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>

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json-java处理-jackson

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