Ⅰ java中如何將一個json形式的字元串轉為json對象
org.json.jsonobject
去下一個這個jar包吧。
是專用處理json字元串的。
你的這個需求如果對象單一完成可以半自動化完成。
jsonobject
json
=
new
jsonobject(json字元串)
;
if(json.has("你要解析的json是否存在")){
//.....創建你的對象。
//.....解析值並賦值給你的對象
}
如果要實現完成自動解析就得反射了。
以上回答你滿意么？
Ⅱ 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());
}
}
}
Ⅲ java 怎麼把數據json字元串
Java可以使用 fastjson、gson、Jackson或是其他類似的工具將Java對象轉成json字元串(同時也可以將json格式轉換成java對象)
demo: 將fastjson jar包添加綁定到項目後,需要轉換的地方使用如下代碼
Useruser=(User)JSONObject.parse(jsonStr);//jsontojava
StringjsonStr=JSONObject.toJSONString(javaObject);//javatojson
Ⅳ JAVA中json字元串如何轉化為map對象獲取數據
我們需要先把json字元串轉化為net.sf.json.JSONObject對象，java中這樣就可以完成json字元串到Map的轉換了。
Ⅳ Java如何快速構造JSON字元串
用谷歌開發的Gosn包即可，或者自己寫
思路：
判斷對象類型，Map List 普通bean
分別迭代循環構造（拼接字元串）
利用遞歸，循環迭代即可。
Ⅵ java 解析json字元串格式 [{}]
你在哪裡解析
1、Java類裡面：JSONObject jsonObject = new JSONObject(str);
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
2、javascript：JSON.parse(str)；
ie8(兼容模式),ie7和ie6沒有JSON對象，不過http://www.json.org/提供了一個json.js,這樣ie8(兼容模式),ie7和ie6就可以支持JSON對象以及其stringify()和parse()方法；你可以在https://github.com/douglascrockford/JSON-js上獲取到這個js，一般現在用json2.js。
ie8(兼容模式),ie7和ie6可以使用eval()將字元串轉為JSON對象，
var c='{"name":"Mike","sex":"女","age":"29"}';
var cToObj=eval("("+str+")");
Ⅶ 關於Java處理JSON字元串的新手問題
Object values=jsonobject.get(keys);這一句寫錯了，應該是Object values=jsonobject.get(string );不然列印出來是空，你這個json字元串本來就很短，沒有規律，不用map中嵌套map，如果嵌套的話不還如寫一個實體類把key當時實體類中的屬性