java Realizes Reflection json Dynamic Transformation to Entity Classes fastjson
- 2021-08-21 20:40:05
- OfStack
I won't talk too much, let's just look at the code ~
package test.refect;
public class Student {
// Name
private String name;
// Age
private String age;
// Address
private String address;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
@Override
public String toString() {
return "Student [name=" + name + ", age=" + age + ", address=" + address + "]";
}
public void sayHello(Book book){
System.out.println(book.getName());
}
}
package test.refect;
public class Book {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
package test.refect;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import com.alibaba.fastjson.JSONObject;
public class ExecuteWithFastJson {
public static <T> void main(String[] args) {
// Student str --> Student Main class
String str = "test.refect.Student";
Class<?> clazz = null;
try {
clazz = Class.forName(str);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Book Entity str --> Book Parameter class
String bookStr = "test.refect.Book";
Class<?> bookClazz = null;
try {
bookClazz = Class.forName(bookStr);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// json --> Book Convert the parameter class to JSONOBJECT
String bookJson = "{\"name\":\"Java\"}";
// Instantiate parameter class
T t = (T) JSONObject.parseObject(bookJson, bookClazz);
// Inject the parameter class into the main class
Method method =null;
try {
method = clazz.getDeclaredMethod("sayHello", bookClazz);
} catch (NoSuchMethodException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (SecurityException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
// Execute the main class
try {
method.invoke(clazz.newInstance(), t);
} catch (IllegalAccessException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IllegalArgumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InvocationTargetException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InstantiationException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
Supplement: jsonObject to Entity Class Objects Using fastjson
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.7</version>
</dependency>
Firstly, the related jar packet is introduced,
Suppose you have 1 entity class User
public class User{
private int id;
private String name;
}
Then type conversion is performed through fastJson
public static void main(String[] args){
String userString = "{"id":1,"name","lz"}";
JSONObject userJson = JSONObject.parseObject(userString);
User user = JSON.toJavaObject(userJson,User.class);
}