json實例java

A. 非常復雜的一個json串，怎麼轉成java對象

1、可藉助開源組件FastJson或者Jackson。

2、自己動手

a、使用反射獲取對象所有的setter方法以及對於所需的參數類型用map對應

b、循環上訴集合，依次使用反射調用set方法，並使用正則匹配json串中的值，可以使用class.getDeclareFileds();獲取變數名，注意若參數是class類型需要反射為實例後填充，class類型匹配json串是也需要注意，因為可能存在嵌套對象中變數名一致的情況。展示部分代碼如下：

3、綜合分析還是建議使用中間件來進行映射。可參考Jackson示例

B. JAVA如何獲取json字元串 最好有實例 感謝

//bean類
publicclassTet{
	privateStringbuildingNum;//"E1",
	privateStringclassName;//"1",
	privateStringclassNum;//"通信15-1班",
	privateStringcollege;//"電子信息工程學院",
	privateStringdormNum;//"110",
	privateStringgrade;//"2015",
	privateStringisCommunist;//"0",
	privateStringisDormLeader;//"1",
	privateStringisStudentLeader;//"1",
	privateStringmajor;//"通信工程",
	privateStringphoneNum;//"13591991111",
	privateStringstatus;//"1",
	privateStringstudentId;//"1",
	privateStringstudentName;//"張三",
	privateStringteachername;//"張四"
	publicStringgetBuildingNum(){
		returnbuildingNum;
	}
	publicvoidsetBuildingNum(StringbuildingNum){
		this.buildingNum=buildingNum;
	}
	publicStringgetClassName(){
		returnclassName;
	}
	publicvoidsetClassName(StringclassName){
		this.className=className;
	}
	publicStringgetClassNum(){
		returnclassNum;
	}
	publicvoidsetClassNum(StringclassNum){
		this.classNum=classNum;
	}
	publicStringgetCollege(){
		returncollege;
	}
	publicvoidsetCollege(Stringcollege){
		this.college=college;
	}
	publicStringgetDormNum(){
		returndormNum;
	}
	publicvoidsetDormNum(StringdormNum){
		this.dormNum=dormNum;
	}
	publicStringgetGrade(){
		returngrade;
	}
	publicvoidsetGrade(Stringgrade){
		this.grade=grade;
	}
	publicStringgetIsCommunist(){
		returnisCommunist;
	}
	publicvoidsetIsCommunist(StringisCommunist){
		this.isCommunist=isCommunist;
	}
	publicStringgetIsDormLeader(){
		returnisDormLeader;
	}
	publicvoidsetIsDormLeader(StringisDormLeader){
		this.isDormLeader=isDormLeader;
	}
	(){
		returnisStudentLeader;
	}
	publicvoidsetIsStudentLeader(StringisStudentLeader){
		this.isStudentLeader=isStudentLeader;
	}
	publicStringgetMajor(){
		returnmajor;
	}
	publicvoidsetMajor(Stringmajor){
		this.major=major;
	}
	publicStringgetPhoneNum(){
		returnphoneNum;
	}
	publicvoidsetPhoneNum(StringphoneNum){
		this.phoneNum=phoneNum;
	}
	publicStringgetStatus(){
		returnstatus;
	}
	publicvoidsetStatus(Stringstatus){
		this.status=status;
	}
	publicStringgetStudentId(){
		returnstudentId;
	}
	publicvoidsetStudentId(StringstudentId){
		this.studentId=studentId;
	}
	publicStringgetStudentName(){
		returnstudentName;
	}
	publicvoidsetStudentName(StringstudentName){
		this.studentName=studentName;
	}
	publicStringgetTeachername(){
		returnteachername;
	}
	publicvoidsetTeachername(Stringteachername){
		this.teachername=teachername;
	}
	
	
	
}

//實現類
importnet.sf.json.JSONArray;
publicclassTest{
	publicstaticvoidmain(String[]args){
		/*
		*做法建立一個bean類屬性就為字元串的Key;
		*/
		//定義JSON串String類型
		Stringa="[{"buildingNum":"E1","className":"1","classNum":"通信15-1班","college":"電子信息工程學院","dormNum":"110","grade":"2015","isCommunist":"0","isDormLeader":"1","isStudentLeader":"1","major":"通信工程","phoneNum":"13591991111","status":"1","studentId":"1","studentName":"張三","teachername":"張四"},{"buildingNum":"E1","className":"1","classNum":"通信15-1班","college":"電子信息工程學院","dormNum":"110","grade":"2015","isCommunist":"0","isDormLeader":"1","isStudentLeader":"1","major":"通信工程","phoneNum":"13591991111","status":"1","studentId":"2","studentName":"張1","teachername":"張四"},{"buildingNum":"E1","className":"1","classNum":"通信15-1班","college":"電子信息工程學院","dormNum":"110","grade":"2015","isCommunist":"0","isDormLeader":"1","isStudentLeader":"1","major":"通信工程","phoneNum":"13591991111","status":"1","studentId":"3","studentName":"張2","teachername":"張四"},{"buildingNum":"E1","className":"1","classNum":"通信15-1班","college":"電子信息工程學院","dormNum":"101","grade":"2015","isCommunist":"0","isDormLeader":"1","isStudentLeader":"1","major":"通信工程","phoneNum":"13591991111","status":"1","studentId":"4","
				+""studentName":"張3","teachername":"張四"}]";
			//轉換成集合
			List<Tet>list2=(List<Tet>)JSONArray.toList(JSONArray.fromObject(a),Tet.class);
		for(Tett:list2){
			//取出編號
			System.out.println(t.getBuildingNum());
}
		//轉換成數組
		Tet[]ss=(Tet[])JSONArray.toArray(JSONArray.fromObject(a),Tet.class);
for(Tett:ss){
	//取出姓名
System.out.println(t.getTeachername());
}
	}
}

C. java jSon實例編寫

是這么個過程
1、在頁面用js發出個ajax請求，請求類型最好寫成json，建議使用jquery的ajax方法，省事。請求的路徑要配在web.xml中
2、這個請求路徑制定的是一個servlet，就是一個java類，繼承自httpservlet。這個servlet里可以通過request對象獲取到輸入參數，根據輸入參數和自己具體的邏輯拼出個字元串，當然是json格式的。然後輸出。這個不會寫說明你需要補一補java web開發的基礎知識。
3、在頁面的ajax請求的success方法中，直接可以獲取到返回的json對象，然後就根據你的json格式處理吧。

$.ajax({
url: 'ajax/test',//這個是servlet請求路徑
success: function(data) { //data就是servlet輸出的json格式字元串，這里會自動轉化為json對象
alert('Load was performed.');
}
});

D. java如何返回json格式

例如：
Student st1 = new Student(1, "dg", 18, new Date());
Student st2 = new Student(2, "dg", 18, new Date());
Student st3 = new Student(3, "dg", 18, new Date());
Student st4 = new Student(4, "dg", 18, new Date());
Student st5 = new Student(5, "dg", 18, new Date());
List li = new ArrayList();
JSONObject JO1 = new JSONObject(st1);
JSONObject JO2 = new JSONObject(st2);
JSONObject JO3 = new JSONObject(st3);
JSONObject JO4 = new JSONObject(st4);
JSONObject JO5 = new JSONObject(st5);
li.add(JO1);
li.add(JO2);
li.add(JO3);
li.add(JO4);
li.add(JO5);
JSONArray Ja = new JSONArray(li);
Map ma = new HashMap();
ma.put("Result", "OK");
ma.put("Records", Ja);
JSONObject js = new JSONObject(ma);
out.print(js);

返回結果：

{"Result":"OK","Records":[{"recordDate":"Fri Dec 16 17:54:39 CST 2011","name":"dg","age":18,"personId":1},{"recordDate":"Fri Dec 16 17:54:39 CST 2011","name":"dg","age":18,"personId":2},{"recordDate":"Fri Dec 16 17:54:39 CST 2011","name":"dg","age":18,"personId":3},{"recordDate":"Fri Dec 16 17:54:39 CST 2011","name":"dg","age":18,"personId":4},{"recordDate":"Fri Dec 16 17:54:39 CST 2011","name":"dg","age":18,"personId":5}]}

E. Java實現JSON多層遍歷

JSONObject jsonObject = new JSONObject(s);
然後用Iterator迭代器遍歷取值，建議用反射機制解析到封裝好的對象中
JSONObject jsonObject = new JSONObject(jsonString);
Iterator iterator = jsonObject.keys();while(iterator.hasNext()){
key = (String) iterator.next();
value = jsonObject.getString(key);
}

F. java中AJAX使用JSON的實例

我空間有一個例子：用Ajax實現多級聯動下拉列表For JSP，地址：http://hi..com/tz666/blog/item/63f17ca342eb81b8cbefd019.html

G. java 怎麼將List<List<Object>>類型轉換成json類型，怎麼讀取json類型

java中將list對象轉換成json類型，可以使用json拼接的方式，實例如下：

json:[{},{}]
Stringjson="[";
for(Objectobj:list){
json=json+"{"+obj+"}";
}
json=json+"]"
returnjson;