package com.demo.test;

import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.codehaus.jackson.JsonEncoding;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.JsonProcessingException;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.node.JsonNodeFactory;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.demo.entity.Account;

public class JacksonTest {
	private JsonGenerator jsonGenerator = null;
	private ObjectMapper objectMapper = null;
	private Account bean = null;
	
	@Before
	public void init() {
		bean = new Account();
		bean.setAddress("CHINA-BJ");
		bean.setEmail("11@qq.com");
		bean.setId(1);
		bean.setName("haha");
		
		objectMapper = new ObjectMapper();
		
		try {
			jsonGenerator = objectMapper.getJsonFactory().createJsonGenerator(System.out, JsonEncoding.UTF8);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	@After
	public void destory() {
		try {
			if (jsonGenerator != null) {
				jsonGenerator.flush();
			}
			if (!jsonGenerator.isClosed()) {
				jsonGenerator.close();
			}
			jsonGenerator = null;
			objectMapper = null;
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	@Test
	public void writeEntityJson() {
		try {
			System.out.println("jsonGenerator");
			//writeObject可以转化java对象，eg:JavaBean/Map/List/Array
			jsonGenerator.writeObject(bean);
			System.out.println();
			System.out.println("objectMapper");
			//writeValue与writeObject有相同的功能
			objectMapper.writeValue(System.out, bean);
		} catch (JsonProcessingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	@Test
	public void writeMapJson() {
		try{
			Map<String, Object> map = new HashMap<String, Object>();
			map.put("name", bean.getName());
			map.put("account", bean);
			bean = new Account();
			bean.setAddress("CHINA-GZ");
			bean.setEmail("22@qq.com");
			map.put("account2", bean);
			
			System.out.println("jsonGenerator");
			jsonGenerator.writeObject(map);
			System.out.println();
			System.out.println("objectMapper");
			objectMapper.writeValue(System.out, map);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	@Test
	public void writeListJson() {
		try{
			List<Account> accounts = new ArrayList<Account>();
			accounts.add(bean);
			bean = new Account();
			bean.setId(2);
			bean.setName("lala");
			bean.setAddress("CHINA-GZ");
			bean.setEmail("22@qq.com");
			accounts.add(bean);
			
			System.out.println("jsonGenerator");
			jsonGenerator.writeObject(accounts);
			System.out.println();
			System.out.println("objectMapper");
			
			System.out.println("1###" + objectMapper.writeValueAsString(accounts));
			System.out.println("2###");
			objectMapper.writeValue(System.out, accounts);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
	
	@Test
	public void writeOthersJson() {
		try{
			String[] arr = {"abc", "def", "jhi"};
			System.out.println("jsonGenerator");
			String str = "Hello Jackson!";
			//byte
			jsonGenerator.writeBinary(str.getBytes());
			//boolean
			jsonGenerator.writeBoolean(true);
			//null
			jsonGenerator.writeNull();
			//float
			jsonGenerator.writeNumber(2.5f);
			//char
			jsonGenerator.writeRaw("c");
			//String
			jsonGenerator.writeRaw(str, 1, 5);
			//String
			jsonGenerator.writeRawValue(str, 5, 5);
			//String
			jsonGenerator.writeString(str);
			
			jsonGenerator.writeTree(JsonNodeFactory.instance.POJONode(str));
			
			System.out.println();
			//Objcet {"user":{"name":"lala","sex":true,"age":26},"infos":[22,"Hello Jackson"]}
			jsonGenerator.writeStartObject(); //{
			jsonGenerator.writeObjectFieldStart("user"); //user:{
			jsonGenerator.writeStringF