json实例java

A. 非常复杂的一个json串，怎么转成java对象

1、可借助开源组件FastJson或者Jackson。

2、自己动手

a、使用反射获取对象所有的setter方法以及对于所需的参数类型用map对应

b、循环上诉集合，依次使用反射调用set方法，并使用正则匹配json串中的值，可以使用class.getDeclareFileds();获取变量名，注意若参数是class类型需要反射为实例后填充，class类型匹配json串是也需要注意，因为可能存在嵌套对象中变量名一致的情况。展示部分代码如下：

3、综合分析还是建议使用中间件来进行映射。可参考Jackson示例

B. JAVA如何获取json字符串 最好有实例 感谢

//bean类
publicclassTet{
	privateStringbuildingNum;//"E1",
	privateStringclassName;//"1",
	privateStringclassNum;//"通信15-1班",
	privateStringcollege;//"电子信息工程学院",
	privateStringdormNum;//"110",
	privateStringgrade;//"2015",
	privateStringisCommunist;//"0",
	privateStringisDormLeader;//"1",
	privateStringisStudentLeader;//"1",
	privateStringmajor;//"通信工程",
	privateStringphoneNum;//"13591991111",
	privateStringstatus;//"1",
	privateStringstudentId;//"1",
	privateStringstudentName;//"张三",
	privateStringteachername;//"张四"
	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;
	}
	
	
	
}

//实现类
importnet.sf.json.JSONArray;
publicclassTest{
	publicstaticvoidmain(String[]args){
		/*
		*做法建立一个bean类属性就为字符串的Key;
		*/
		//定义JSON串String类型
		Stringa="[{"buildingNum":"E1","className":"1","classNum":"通信15-1班","college":"电子信息工程学院","dormNum":"110","grade":"2015","isCommunist":"0","isDormLeader":"1","isStudentLeader":"1","major":"通信工程","phoneNum":"13591991111","status":"1","studentId":"1","studentName":"张三","teachername":"张四"},{"buildingNum":"E1","className":"1","classNum":"通信15-1班","college":"电子信息工程学院","dormNum":"110","grade":"2015","isCommunist":"0","isDormLeader":"1","isStudentLeader":"1","major":"通信工程","phoneNum":"13591991111","status":"1","studentId":"2","studentName":"张1","teachername":"张四"},{"buildingNum":"E1","className":"1","classNum":"通信15-1班","college":"电子信息工程学院","dormNum":"110","grade":"2015","isCommunist":"0","isDormLeader":"1","isStudentLeader":"1","major":"通信工程","phoneNum":"13591991111","status":"1","studentId":"3","studentName":"张2","teachername":"张四"},{"buildingNum":"E1","className":"1","classNum":"通信15-1班","college":"电子信息工程学院","dormNum":"101","grade":"2015","isCommunist":"0","isDormLeader":"1","isStudentLeader":"1","major":"通信工程","phoneNum":"13591991111","status":"1","studentId":"4","
				+""studentName":"张3","teachername":"张四"}]";
			//转换成集合
			List<Tet>list2=(List<Tet>)JSONArray.toList(JSONArray.fromObject(a),Tet.class);
		for(Tett:list2){
			//取出编号
			System.out.println(t.getBuildingNum());
}
		//转换成数组
		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实例编写

是这么个过程
1、在页面用js发出个ajax请求，请求类型最好写成json，建议使用jquery的ajax方法，省事。请求的路径要配在web.xml中
2、这个请求路径制定的是一个servlet，就是一个java类，继承自httpservlet。这个servlet里可以通过request对象获取到输入参数，根据输入参数和自己具体的逻辑拼出个字符串，当然是json格式的。然后输出。这个不会写说明你需要补一补java web开发的基础知识。
3、在页面的ajax请求的success方法中，直接可以获取到返回的json对象，然后就根据你的json格式处理吧。

$.ajax({
url: 'ajax/test',//这个是servlet请求路径
success: function(data) { //data就是servlet输出的json格式字符串，这里会自动转化为json对象
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);

返回结果：

{"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实现JSON多层遍历

JSONObject jsonObject = new JSONObject(s);
然后用Iterator迭代器遍历取值，建议用反射机制解析到封装好的对象中
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的实例

我空间有一个例子：用Ajax实现多级联动下拉列表For JSP，地址：http://hi..com/tz666/blog/item/63f17ca342eb81b8cbefd019.html

G. java 怎么将List<List<Object>>类型转换成json类型，怎么读取json类型

java中将list对象转换成json类型，可以使用json拼接的方式，实例如下：

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