如何使用java访问json
我在rest响应中有以下json：如何使用java访问json,java,json,Java,Json,我在rest响应中有以下json： { "TRANS": { "HPAY": [ { "ID": "1234", "DATE": "10/09/2011 18:09:27", "REC": "wallet Ricaricato", "COM": "Tasso Commissione", "MSG": "Commento White
{
"TRANS": {
"HPAY": [
{
"ID": "1234",
"DATE": "10/09/2011 18:09:27",
"REC": "wallet Ricaricato",
"COM": "Tasso Commissione",
"MSG": "Commento White Brand",
"STATUS": "3",
"EXTRA": {
"IS3DS": "0",
"CTRY": "FRA",
"AUTH": "455622"
},
"INT_MSG": "05-00-05 ERR_PSP_REFUSED",
"MLABEL": "IBAN",
"TYPE": "1"
}
]
}
}
public class Trans {
private List<Hpay> hpay;
public Trans(){
}
//getter and setter
}
如果我在事务上调用hpay方法，我就有空。我不知道为什么…首先使用json.simple解析json数据，然后使用setter设置值
Object obj = parser.parse(new FileReader( "file.json" ));
JSONObject jsonObject = (JSONObject) obj;
JSONArray hpayObj= (JSONArray) jsonObject.get("HPAY");
//get the first element of array
JSONObject details= hpayObj.getJSONArray(0);
String id = (String)details.get("ID");
//set the value of the id field in the setter of class Trans
new Trans().setId(id);
new Trans().setDate((String)details.get("DATE"));
new Trans().setRec((String)details.get("REC"));
//get the second array element
JSONObject intMsgObj= hpayObj.getJSONArray(1);
new Trans().setIntmsg((String)details.get("INT_MSG"));
//get the third array element
JSONObject mlabelObj= hpayObj.getJSONArray(2);
new Trans().setMlabel((String)details.get("MLABEL"));
JSONObject typeObj= hpayObj.getJSONArray(3);
new Trans().setType((String)details.get("TYPE"));
现在您可以使用您的GETTER方法获取值。
我已经删除了以前的答案，并添加了一个新的值作为您的要求
JSON字符串：{
"TRANS": {
"HPAY": [{
"ID": "1234",
"DATE": "10/09/2011 18:09:27",
"REC": "wallet Ricaricato",
"COM": "Tasso Commissione",
"MSG": "Commento White Brand",
"STATUS": "3",
"EXTRA": {
"IS3DS": "0",
"CTRY": "FRA",
"AUTH": "455622"
},
"INT_MSG": "05-00-05 ERR_PSP_REFUSED",
"MLABEL": "IBAN",
"TYPE": "1"
}
]
}
}
Extragooglegosncom.google.gson.annotations.Expose
com.google.gson.annotations.SerializedName在Gson库中使用jackson。。他们有将JSON转换为java对象的实用工具。Extra
class的定义是什么？可能是@Badda的重复我认为我的问题是我的类中的列表…在该代码中，你没有错过类定义中的“REC”字段你非常欢迎。。。如果有任何查询，我知道。我是否必须更改我的get/set方法？set/get方法的名称无关紧要。它适用于注释。如果您的json字段是get change，那么您需要更改SerializedName
中的测试，例如：@SerializedName（“”）
，现在我对另一个json也有同样的问题。。这里是哪种结构：我使用了相同的结构，但不起作用：(
//get the second array element
JSONObject intMsgObj= hpayObj.getJSONArray(1);
new Trans().setIntmsg((String)details.get("INT_MSG"));
//get the third array element
JSONObject mlabelObj= hpayObj.getJSONArray(2);
new Trans().setMlabel((String)details.get("MLABEL"));
JSONObject typeObj= hpayObj.getJSONArray(3);
new Trans().setType((String)details.get("TYPE"));
{
"TRANS": {
"HPAY": [{
"ID": "1234",
"DATE": "10/09/2011 18:09:27",
"REC": "wallet Ricaricato",
"COM": "Tasso Commissione",
"MSG": "Commento White Brand",
"STATUS": "3",
"EXTRA": {
"IS3DS": "0",
"CTRY": "FRA",
"AUTH": "455622"
},
"INT_MSG": "05-00-05 ERR_PSP_REFUSED",
"MLABEL": "IBAN",
"TYPE": "1"
}
]
}
}
public class MyObject {
@SerializedName("TRANS")
@Expose
private Trans trans;
public Trans getTRANS() {return trans;}
public void setTRANS(Trans trans) {this.trans = trans;}
}
public class Trans {
@SerializedName("HPAY")
@Expose
private List<HPay> hPay;
public List<HPay> getHPAY() {return hPay;}
public void setHPAY(List<HPay> hPay) {this.hPay = hPay;}
}
public class HPay {
@SerializedName("ID")
@Expose
private String id;
@SerializedName("DATE")
@Expose
private String date;
@SerializedName("REC")
@Expose
private String rec;
@SerializedName("COM")
@Expose
private String com;
@SerializedName("MSG")
@Expose
private String msg;
@SerializedName("STATUS")
@Expose
private String status;
@SerializedName("EXTRA")
@Expose
private Extra extra;
@SerializedName("INT_MSG")
@Expose
private String intMsg;
@SerializedName("MLABEL")
@Expose
private String mLabel;
@SerializedName("TYPE")
@Expose
private String type;
public String getID() {return id;}
public void setID(String id) {this.id = id;}
public String getDATE() {return date;}
public void setDATE(String date) {this.date = date;}
public String getREC() {return rec;}
public void setREC(String rec) {this.rec = rec;}
public String getCOM() {return com;}
public void setCOM(String com) {this.com = com;}
public String getMSG() {return msg;}
public void setMSG(String msg) {this.msg = msg;}
public String getSTATUS() {return status;}
public void setSTATUS(String status) {this.status = status;}
public Extra getEXTRA() {return extra;}
public void setEXTRA(Extra extra) {this.extra = extra;}
public String getINTMSG() {return intMsg;}
public void setINTMSG(String intMsg) {this.intMsg = intMsg;}
public String getMLABEL() {return mLabel;}
public void setMLABEL(String mLabel) {this.mLabel = mLabel;}
public String getTYPE() {return type;}
public void setTYPE(String type) {this.type = type;}
}
public class Extra {
@SerializedName("IS3DS")
@Expose
private String is3ds;
@SerializedName("CTRY")
@Expose
private String ctry;
@SerializedName("AUTH")
@Expose
private String auth;
public String getIS3DS() { return is3ds; }
public void setIS3DS(String is3ds) { this.is3ds = is3ds; }
public String getCTRY() { return ctry; }
public void setCTRY(String ctry) { this.ctry = ctry; }
public String getAUTH() { return auth; }
public void setAUTH(String auth) { this.auth = auth; }
}
import com.google.gson.Gson;
public class NewClass {
public static void main(String[] args) {
Gson g = new Gson();
g.fromJson(json, MyObject.class);
}
static String json = "{ \"TRANS\": { \"HPAY\": [{ \"ID\": \"1234\", \"DATE\": \"10/09/2011 18:09:27\", \"REC\": \"wallet Ricaricato\", \"COM\": \"Tasso Commissione\", \"MSG\": \"Commento White Brand\", \"STATUS\": \"3\", \"EXTRA\": { \"IS3DS\": \"0\", \"CTRY\": \"FRA\", \"AUTH\": \"455622\" }, \"INT_MSG\": \"05-00-05 ERR_PSP_REFUSED\", \"MLABEL\": \"IBAN\", \"TYPE\": \"1\" } ] } }";
}