Lớp này sẽ xây dựng các đối tượng json:
public class CreateJSON {
private JSONArray mStudArray;
private JSONObject mStudObject;
Student [] student=new Student[3] ;
public CreateJSON() {
}
public void initData() {
//date wirte in student array
student[0]=new Student();
student[0].setmStudName("Vikas");
student[0].setmPhoneNo("1234567890");
student[0].setmRollNo(1);
student[1]=new Student();
student[1].setmStudName("Rahul");
student[1].setmPhoneNo("1234567890");
student[1].setmRollNo(2);
student[2]=new Student();
student[2].setmStudName("Raj");
student[2].setmPhoneNo("1234567890");
student[2].setmRollNo(3);
}
//student array converts to json array
public String writeDataTOJOSON() {
//JONS array created here
mStudArray=new JSONArray();
initData();
for(int i=0;i<3;i++) {
mStudArray.put(createJOSNObject(student[i]));
}
return mStudArray.toString();
}
//student object converted into json object
public JSONObject createJOSNObject(Student student) {
try {
mStudObject=new JSONObject();
mStudObject.put(Constants.NAME,student.getmStudName());
mStudObject.put(Constants.PHONE_NUMBER,student.getmPhoneNo());
mStudObject.put(Constants.ROLL_NUMBER,student.getmRollNo());
} catch (JSONException e) {
e.printStackTrace();
}
return mStudObject;
}
}
// Lớp này sẽ in tạo json
public class PrintJOSN {
private CreateJSON createJSON;
private JSONArray mStudnetArray;
public String printJSONData() {
createJSON=new CreateJSON();
//JSONArray created here.
String jons=createJSON.writeDataTOJOSON();
//JONS in String fomart
Logger.debug("json"+mStudnetArray);
//JOSN array create from string
try {
mStudnetArray=new JSONArray(jons);
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
//parse array parse here
for(int i=0;i<3;i++) {
try {
JSONObject studentObj=(JSONObject) mStudnetArray.get(i);
String name=studentObj.getString("name");
String phone=studentObj.getString("phone_number");
Integer rollnumber=studentObj.getInt("roll_number");
Logger.debug("Student Object::: "+name+" "+phone+" "+rollnumber);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
}
// actvity chính mô hình
public class JSONParserActivity extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
PrintJOSN printJOSN=new PrintJOSN();
printJOSN.printJSONData();
}
}
Sinh viên:
public class Student {
private String mStudName;
private String mPhoneNo;
private Integer mRollNo;
public String getmStudName() {
return mStudName;
}
public void setmStudName(String mStudName) {
this.mStudName = mStudName;
}
public String getmPhoneNo() {
return mPhoneNo;
}
public void setmPhoneNo(String mPhoneNo) {
this.mPhoneNo = mPhoneNo;
}
public Integer getmRollNo() {
return mRollNo;
}
public void setmRollNo(Integer mRollNo) {
this.mRollNo = mRollNo;
}
}
lớp không đổi:
public class Constants {
public static final String NAME="name";
public static final String ROLL_NUMBER="roll_number";
public static final String PHONE_NUMBER="phone_number";
}
Logger lớp:
public class Logger {
public static final String APP_ID = "androidapp";
public static String logDir = "/androidapp";
public static String logFileName = "/log.txt";
public static boolean writeLogsToFile = false;
public static final int LOG_LEVEL_VERBOSE = 4;
public static final int LOG_LEVEL_DEBUG = 3;
public static final int LOG_LEVEL_INFO = 2;
public static final int LOG_LEVEL_ERROR = 1;
public static final int LOG_LEVEL_OFF = 0;
public static final int CURRENT_LOG_LEVEL = LOG_LEVEL_DEBUG;
public static void log(String message, int logLevel) {
if (logLevel > CURRENT_LOG_LEVEL) {
return;
} else {
Log.v(APP_ID, message);
if (writeLogsToFile) {
writeToFile(message);
}
}
}
private static void writeToFile(String message) {
try {
File sdCard = Environment.getExternalStorageDirectory();
File dir = new File(sdCard.getAbsolutePath() + logDir);
dir.mkdirs();
File file = new File(dir, logFileName);
PrintWriter writer = new PrintWriter(new BufferedWriter(new FileWriter(file, true), 8 * 1024));
writer.println(APP_ID + " " + new Date().toString() + " : " + message);
writer.flush();
writer.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public static void verbose(String message) {
log(message, LOG_LEVEL_VERBOSE);
}
public static void debug(String message) {
log(message, LOG_LEVEL_DEBUG);
}
public static void error(String message) {
log(message, LOG_LEVEL_ERROR);
}
public static void info(String message) {
log(message, LOG_LEVEL_INFO);
}
}
Vui lòng kiểm tra đăng nhập của bạn, nó sẽ hiển thị tạo json và json in.
"JSONObject json = new JSONObject (jsonString);" –
Những gì "(jsonString)" là cho trong dòng trên. –
@david - đây là chuỗi chứa thông tin được mã hóa JSON. – adamk