正文
Java中JSONObject相关操作
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maven项目pom配置：
<dependency>
<groupId>net.sf.json-lib</groupId>
<artifactId>json-lib</artifactId>
<version>2.4</version>
<classifier>jdk15</classifier>
</dependency>
import net.sf.json.JSONObject; //报文
String report="{\"SEND_TIME\":\"20170509235000\",\"AREA_SOURCE\":\"ZSQD\",\"ACID\":\"QDA9772\",\"TASK\":\"W/Z\","
+ "\"PLAN_SOURCE\":\"QDNEXTPLAN\",\"ADEP\":\"ZUUU\",\"ADES\":\"ZSQD\",\"STOD\":\"0240\",\"STOA\":\"0525\","
+ "\"ETOT\":\"0240\",\"ELDT\":\"0525\",\"AIRCRAFT_TYPE\":\"A320\",\"REGID\":\"B1648\",\"EXECUTE_DATE\":\"20170510\"}";
//转json对象(反序列化)
JSONObject jsonObject = JSONObject.fromObject(report);
//强转成PlanReport类
PlanReport hbreport=(PlanReport)JSONObject.toBean(jsonObject,PlanReport.class);
//序列化
jsonObject.toString();
//json合并 相同的字段会被后一个覆盖
JSONObject oldjson1=new JSONObject(); oldjson1.put("name", "zhangsan"); JSONObject oldjson2=new JSONObject(); oldjson2.put("name", "lisi");
oldjson2.put("age", "20"); //合并后的json
JSONObject newjson=new JSONObject(); newjson.putAll(oldjson1);
newjson.putAll(oldjson2);
json对比：
/**
*
* 对比json对象中不同的value
*
*/
public static String compareJson(JSONObject json1, JSONObject json2,String key) {
String str="";
@SuppressWarnings("unchecked")
Iterator<String> i = json1.keys();
while (i.hasNext()) {
key = i.next();
str+= compareJson(json1.get(key), json2.get(key),key);
}
return str;
}
public static String compareJson(Object json1,Object json2,String key) {
String str ="";
if ( json1 instanceof JSONObject ) {
str=compareJson((JSONObject) json1 ,(JSONObject) json2,key);
}else if ( json1 instanceof JSONArray ) {
compareJson((JSONArray) json1 ,(JSONArray) json2,key);
}else if(json1 instanceof String ){
str=compareJson((String) json1 ,(String) json2,key);
}else {
str=compareJson(json1.toString(), json2.toString(), key);
}
return str;
}
public static String compareJson(String str1,String str2,String key) {
String str="";
if (!str1.equals(str2)&& str2!=null) {
//System.out.println("字段更新:"+key+ ",原报文数据:"+ str1 +",新报文数据:"+str2);
str="字段更新:"+key+ ",原报文数据:"+ str1 +",新报文数据:"+str2+" ";
}
return str;
}
public static void compareJson(JSONArray json1,JSONArray json2,String key) {
Iterator<?> i1= json1.iterator();
Iterator<?> i2= json2.iterator();
while ( i1.hasNext()) {
compareJson(i1.next(), i2.next(),key);
}
}
json中不同字段对比，可以先转换成类再用反射技术进行对比
//通过反射获取到不同的属性
List<String> textList = Lists.newArrayList();
String jsonstr="";
try {
Class<? extends PlanReport> clazz = hbreport.getClass();
Field[] fields = hbreport.getClass().getDeclaredFields();
for (Field field : fields) {
PropertyDescriptor pd = new PropertyDescriptor(field.getName(), clazz);
Method getMethod = pd.getReadMethod();
Object o1 = getMethod.invoke(oldreport);
Object o2 = getMethod.invoke(hbreport);
String s1 = o1 == null ? "" : o1.toString();//避免空指针异常
String s2 = o2 == null ? "" : o2.toString();//避免空指针异常 if (!s1.contains(s2)) {
textList.add("字段新增：" + field.getName() + " 字段值：" + s2 + " ");
}
}
} catch (Exception e) {
logger.info("计划日志字段新增反射异常日志打印 [{}]", e);
System.out.println(e.getMessage());
}
for (String object : textList) {
jsonstr+=object;
}
JSONArray遍历：转换Iterator（迭代器）进行遍历
String str = "[{name:'a',value:'aa'},{name:'b',value:'bb'},{name:'c',value:'cc'},{name:'d',value:'dd'}]" ;
JSONArray jsonarr = JSONArray.fromObject(str );
Iterator<Object> it = jsonarr.iterator();
while (it.hasNext()) {
JSONObject jsonObject = (JSONObject) it.next();
System.out.println(jsonObject.toString());
}
JSONArray 中按照某个Key排序：
JSONArray JsonArray=new JSONArray();
JsonArray.add(***);
//从小到大
JsonArray.sort(new Comparator<JSONObject>() {
@Override
public int compare(JSONObject o1, JSONObject o2) {
return o1.getString("SEND_TIME").compareTo(o2.getString("SEND_TIME"));
}
});
