返回Json数据的方法

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指定属性

JSONObject jsonObj = new JSONObject();jsonObj.put("total", dispatchDetailList.size());JsonConfig jsonConfig = new JsonConfig();// 有级联，不能直接转化，要取出List放到map里面// 过滤关联，避免死循环net.sf.json.JSONException: java.lang.reflect.InvocationTargetExceptionjsonConfig.setJsonPropertyFilter(new PropertyFilter() {public boolean apply(Object source, String name, Object value) {if (name.equals("detailId") || name.equals("description") || name.equals("detailMoney")) {//不进行过滤return false;} else {return true;}}});jsonObj.elementOpt("rows", dispatchDetailList, jsonConfig);try {response.getWriter().println(jsonObj.toString());} catch (IOException e) {e.printStackTrace();}

datagrid使用异步提交的方法

if ($('#applyDatagrid').datagrid('getSelected')) {var row = $('#applyDatagrid').datagrid('getSelected');$.messager.confirm('确认', '您确认想要提交记录吗？', function(r) {if (r) {$.ajax({url : '${pageContext.request.contextPath}/travelAppAction!goTravelApp.action',async : true,type : 'POST',dataType : 'JSON',data : {no : row.no},success : function(data) {$.messager.alert('提示', data.msg);$('#applyDatagrid').datagrid('reload');}});}});} else {$.messager.alert('提示', '请选择要提交的数据!');}

使用maven导入json的jar包

<!-- 导入json所需jar包 --><dependency><groupId>net.sf.json-lib</groupId><artifactId>json-lib</artifactId><version>2.4</version><classifier>jdk15</classifier></dependency>

或者导入下面jar包

下拉列表

try {JsonConfig jsonConfig = new JsonConfig();jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);String[] excludes = { "employees","travelApps" };jsonConfig.setExcludes(excludes);JSONArray jsonArr = JSONArray.fromObject(departmentList, jsonConfig);response.getWriter().println(jsonArr.toString());} catch (Exception e) {e.printStackTrace();}

datagrid格式(带日期)

try {JSONObject jsonObj = new JSONObject();jsonObj.put("total", empWorkPlanDetailList.size());JsonConfig jsonConfig = new JsonConfig();jsonConfig.registerJsonValueProcessor(Date.class, new DateJsonValueProcessor2());jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);String[] excludes = { "empWorkPlanDetails","workStreams" };//排除的属性jsonConfig.setExcludes(excludes);jsonObj.elementOpt("rows", empWorkPlanDetailList, jsonConfig);response.getWriter().println(jsonObj.toString());} catch (Exception e) {e.printStackTrace();}

DateJsonValueProcessor2实体类

import java.text.SimpleDateFormat;import java.util.Date;import net.sf.json.JsonConfig;import net.sf.json.processors.JsonValueProcessor;public class DateJsonValueProcessor2 implements JsonValueProcessor {private String format = "yyyy-MM-dd HH:mm:ss";private SimpleDateFormat sdf = new SimpleDateFormat(format);public Object processArrayValue(Object value, JsonConfig arg1) {// TODO Auto-generated method stubreturn this.process(value);}public Object processObjectValue(String arg0, Object value, JsonConfig arg2) {// TODO Auto-generated method stubreturn this.process(value);}private Object process(Object value) {if (value == null) {return "";} else if (value instanceof Date) {return sdf.format((Date) value);} else if (value instanceof Date[]) {Date[] dates = (Date[]) value;String[] obj = new String[dates.length];for (int i = 0; i < dates.length; i++) {obj[i] = sdf.format(dates[i]);}return obj;} else {return value.toString();}}}

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