? ? ? ? 在项目中难免会用java处理json格式的数据,因此封装了一个JSONUtil工具类。
JSONUtil.java
class="java">package com.bijian.json.study; import java.util.ArrayList; import java.util.Date; import java.util.HashMap; import java.util.Iterator; import java.util.List; import java.util.Map; import net.sf.json.JSONArray; import net.sf.json.JSONObject; import net.sf.json.JsonConfig; import net.sf.json.util.CycleDetectionStrategy; public class JSONUtil { /** * 从一个JSON 对象字符格式中得到一个java对象 * @param jsonString * @param pojoCalss * @return */ public static Object getObject4JsonString(String jsonString, Class pojoCalss) { Object pojo; JSONObject jsonObject = JSONObject.fromObject(jsonString); pojo = JSONObject.toBean(jsonObject, pojoCalss); return pojo; } /** * 从json HASH表达式中获取一个map,改map支持嵌套功能 * @param jsonString * @return */ public static Map getMap4Json(String jsonString) { JSONObject jsonObject = JSONObject.fromObject(jsonString); Iterator keyIter = jsonObject.keys(); String key; Object value; Map valueMap = new HashMap(); while (keyIter.hasNext()) { key = (String) keyIter.next(); value = jsonObject.get(key); valueMap.put(key, value); } return valueMap; } /** * * 从json数组中得到相应java数组 * * @param jsonString * * @return */ public static Object[] getObjectArray4Json(String jsonString) { JSONArray jsonArray = JSONArray.fromObject(jsonString); return jsonArray.toArray(); } /** * 从json对象集合表达式中得到一个java对象列表 * @param jsonString * @param pojoClass * @return */ public static List getList4Json(String jsonString, Class pojoClass) { JSONArray jsonArray = JSONArray.fromObject(jsonString); JSONObject jsonObject; Object pojoValue; List list = new ArrayList(); for (int i = 0; i < jsonArray.size(); i++) { jsonObject = jsonArray.getJSONObject(i); pojoValue = JSONObject.toBean(jsonObject, pojoClass); list.add(pojoValue); } return list; } /** * * 从json数组中解析出java字符串数组 * * @param jsonString * * @return */ public static String[] getStringArray4Json(String jsonString) { JSONArray jsonArray = JSONArray.fromObject(jsonString); String[] stringArray = new String[jsonArray.size()]; for (int i = 0; i < jsonArray.size(); i++) { stringArray[i] = jsonArray.getString(i); } return stringArray; } /** * 从json数组中解析出javaLong型对象数组 * @param jsonString * @return */ public static Long[] getLongArray4Json(String jsonString) { JSONArray jsonArray = JSONArray.fromObject(jsonString); Long[] longArray = new Long[jsonArray.size()]; for (int i = 0; i < jsonArray.size(); i++) { longArray[i] = jsonArray.getLong(i); } return longArray; } /** * 从json数组中解析出java Integer型对象数组 * @param jsonString * @return */ public static Integer[] getIntegerArray4Json(String jsonString) { JSONArray jsonArray = JSONArray.fromObject(jsonString); Integer[] integerArray = new Integer[jsonArray.size()]; for (int i = 0; i < jsonArray.size(); i++) { integerArray[i] = jsonArray.getInt(i); } return integerArray; } /** * 从json数组中解析出java Date 型对象数组,使用本方法必须保证 * @param jsonString * @return */ public static Date[] getDateArray4Json(String jsonString, String DataFormat) { JSONArray jsonArray = JSONArray.fromObject(jsonString); Date[] dateArray = new Date[jsonArray.size()]; String dateString; Date date; for (int i = 0; i < jsonArray.size(); i++) { dateString = jsonArray.getString(i); date = DateUtil.stringToDate(dateString, DataFormat); dateArray[i] = date; } return dateArray; } /** * 从json数组中解析出java Integer型对象数组 * @param jsonString * @return */ public static Double[] getDoubleArray4Json(String jsonString) { JSONArray jsonArray = JSONArray.fromObject(jsonString); Double[] doubleArray = new Double[jsonArray.size()]; for (int i = 0; i < jsonArray.size(); i++) { doubleArray[i] = jsonArray.getDouble(i); } return doubleArray; } /** * * 将java对象转换成json字符串 * * @param javaObj * * @return */ public static String getJsonString4JavaPOJO(Object javaObj) { JSONObject json; json = JSONObject.fromObject(javaObj); return json.toString(); } /** * 将java对象转换成json字符串,并设定日期格式 * @param javaObj * @param dataFormat * @return */ public static String getJsonString4JavaPOJO(Object javaObj, String dataFormat) { JSONObject json; JsonConfig jsonConfig = configJson(dataFormat); json = JSONObject.fromObject(javaObj, jsonConfig); return json.toString(); } /** * JSON 时间解析器具 * @param datePattern * @return */ public static JsonConfig configJson(String datePattern) { JsonConfig jsonConfig = new JsonConfig(); jsonConfig.setExcludes(new String[] { "" }); jsonConfig.setIgnoreDefaultExcludes(false); jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT); jsonConfig.registerJsonValueProcessor(Date.class,new DateJsonValueProcessor(datePattern)); return jsonConfig; } /** * @param excludes * @param datePattern * @return */ public static JsonConfig configJson(String[] excludes,String datePattern) { JsonConfig jsonConfig = new JsonConfig(); jsonConfig.setExcludes(excludes); jsonConfig.setIgnoreDefaultExcludes(false); jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT); jsonConfig.registerJsonValueProcessor(Date.class,new DateJsonValueProcessor(datePattern)); return jsonConfig; } /** * @param args */ public static void main(String[] args) { Object obj01 = getObject4JsonString("{'name':'bijian','age':'30','phone':'13899998888'}", TestObject.class); System.out.println(obj01); Object[] obj = getObjectArray4Json("['json','is','easy']"); for(Object o: obj) { System.out.println(o); } Map map = getMap4Json("{'json':'001','is':'002','easy':'003'}"); System.out.println(map); } }
DateUtil.java
package com.bijian.json.study; import java.text.ParseException; import java.text.SimpleDateFormat; import java.util.Date; public class DateUtil { public static Date stringToDate(String dateString, String dataFormat) { SimpleDateFormat sdf = new SimpleDateFormat(dataFormat); Date date = null; try { date = sdf.parse(dateString); } catch (ParseException e) { e.printStackTrace(); } return date; } }
DateJsonValueProcessor.java
package com.bijian.json.study; import java.text.DateFormat; import java.text.SimpleDateFormat; import java.util.Date; import net.sf.json.JsonConfig; import net.sf.json.processors.JsonValueProcessor; public class DateJsonValueProcessor implements JsonValueProcessor { public static final String DEFAULT_DATE_PATTERN = "yyyy-MM-dd"; private DateFormat dateFormat; /** * 构造方法. * * @param datePattern * 日期格式 */ public DateJsonValueProcessor(String datePattern) { if (null == datePattern) { dateFormat = new SimpleDateFormat(DEFAULT_DATE_PATTERN); }else { dateFormat = new SimpleDateFormat(datePattern); } } /* * (非 Javadoc) * * @see net.sf.json.processors.JsonValueProcessor#processArrayValue(java. * lang.Object, net.sf.json.JsonConfig) */ public Object processArrayValue(Object arg0, JsonConfig arg1) { // TODO 自动生成方法存根 return process(arg0); } /* * (非 Javadoc) * * @see net.sf.json.processors.JsonValueProcessor#processObjectValue(java * .lang.String, java.lang.Object, net.sf.json.JsonConfig) */ public Object processObjectValue(String arg0, Object arg1, JsonConfig arg2) { return process(arg1); } private Object process(Object value) { return dateFormat.format((Date) value); } }
TestObject.java
package com.bijian.json.study; public class TestObject { private String name; private int age; private String phone; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getPhone() { return phone; } public void setPhone(String phone) { this.phone = phone; } }
JSONUtil.java中的main方法运行结果:
com.bijian.json.study.TestObject@56f631 json is easy {is=002, easy=003, json=001}
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文章来源:http://blog.163.com/caoyanhua_05/blog/static/63966999200911184219995/