java Object<->Json use jackson-core-asl.jar

最新推荐文章于 2021-02-16 03:16:04 发布

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最新推荐文章于 2021-02-16 03:16:04 发布

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分类专栏： Java JSON 文章标签： json java

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[b]json-->Object[/b]


import java.io.File;
import java.io.IOException;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;

public class JacksonExample {
    public static void main(String[] args) {

	ObjectMapper mapper = new ObjectMapper();

	try {

		// read from file, convert it to user class
		User user = mapper.readValue(new File("c:\\user.json"), User.class);

		// display to console
		System.out.println(user);

	} catch (JsonGenerationException e) {

		e.printStackTrace();

	} catch (JsonMappingException e) {

		e.printStackTrace();

	} catch (IOException e) {

		e.printStackTrace();

	}

  }

}

Object-->json


import java.io.File;
import java.io.IOException;
import org.codehaus.jackson.JsonGenerationException;
import org.codehaus.jackson.map.JsonMappingException;
import org.codehaus.jackson.map.ObjectMapper;

public class JacksonExample {
    public static void main(String[] args) {

	User user = new User();
	ObjectMapper mapper = new ObjectMapper();

	try {

		// convert user object to json string, and save to a file
		mapper.writeValue(new File("c:\\user.json"), user);

		// display to console
		System.out.println(mapper.writeValueAsString(user));

	} catch (JsonGenerationException e) {

		e.printStackTrace();

	} catch (JsonMappingException e) {

		e.printStackTrace();

	} catch (IOException e) {

		e.printStackTrace();

	}

  }

}