Java Reflection Implementation JavaBean turn JSON instance code _java

Objecttojson.java

Copy Code code as follows:

Package com. Objecttojson;

Import Java.lang.reflect.Field;
Import java.lang.reflect.InvocationTargetException;
Import Java.lang.reflect.Method;
Import java.util.ArrayList;
Import Java.util.Iterator;

public class Objecttojson {


public static String Objlisttojson (arraylist<?> list) {
StringBuilder build=new StringBuilder ();
Iterators
Iterator<?> Iterator=list.iterator ();
Build.append ("[");
String separate= "";
while (Iterator.hasnext ()) {
Build.append (separate);
object to JSON string
String Str=objtojson (Iterator.next ());
Build.append (str);
Separate= ",";
}
Build.append ("]");
return build.tostring ();
}

@SuppressWarnings ("Unchecked")
public static String Objtojson (Object obj) {
StringBuilder build=new StringBuilder ();
Build.append ("{");
@SuppressWarnings ("Rawtypes")
Class Cla=null;
try {
Reflection Load Class
Cla=class.forname (Obj.getclass (). GetName ());
catch (ClassNotFoundException e) {
System.out.println (Obj.getclass (). toString (). Concat ("No such class found");
E.printstacktrace ();
return null;
}

StringBuffer methodname=new StringBuffer ();
Get variables for Java classes
Field[] Fields=cla.getdeclaredfields ();
String separate= "";
for (Field temp:fields) {
Build.append (separate);
Build.append ("\");
Build.append (Temp.getname ());
Build.append ("\": ");

Methodname.append ("get");
Methodname.append (Temp.getname (). substring (0,1). toUpperCase ());
Methodname.append (Temp.getname (). substring (1));

Build.append ("\");
Method Method=null;
try {
Getting Java Get methods
Method=cla.getmethod (Methodname.tostring ());
catch (Nosuchmethodexception | SecurityException e) {
Methodname.setlength (0);
E.printstacktrace ();
}

try {
Executes the Get method, obtaining the straight of the variable parameter.
Build.append (Method.invoke (obj));
catch (Illegalaccessexception e) {
E.printstacktrace ();
catch (IllegalArgumentException e) {
E.printstacktrace ();
catch (InvocationTargetException e) {
E.printstacktrace ();
}

Build.append ("\");
Methodname.setlength (0);
Separate= ",";
}

Build.append ("}");
return build.tostring ();
}
}

Test.java

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Package com.test;

Import java.util.ArrayList;

Import com. Objecttojson.objecttojson;

public class Test {
public static void Main (string[] args) {
Data construction
Arraylist<user> list=getlist ();
Data conversion
String Listjson=objecttojson.objlisttojson ((arraylist<?>) list);
System.out.println ("{\" data\ ":" +listjson+ "}");
}

public static arraylist<user> GetList () {
User User00=new user ();
User00.setuserage ("27");
User00.setusername ("smart");
User00.setusersex ("man");

User User01=new user ();
User01.setuserage ("27");
User01.setusername ("smart00");
User01.setusersex ("man");

Arraylist<user> list=new arraylist<user> ();

List.add (user00);
List.add (USER01);

return list;
}

}

User.java

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Package com.test;

public class User {
Private String username;
Private String Usersex;
Private String userage;

Public String GetUserName () {
return username;
}
public void Setusername (String username) {
This.username = Username;
}
Public String Getusersex () {
return usersex;
}
public void Setusersex (String usersex) {
This.usersex = Usersex;
}
Public String Getuserage () {
return userage;
}
public void Setuserage (String userage) {
This.userage = Userage;
}

}

Test results

Copy Code code as follows:

{"Data": [{"username": "smart", "Usersex": "Man", "Userage": "The"},{"username": "smart00", "Usersex": "Man", "Userage": " 27 "}]}