<span style="font-size:24px;">package jiba.jacks;

import java.io.File;
import java.io.IOException;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;

import com.fasterxml.jackson.core.JsonEncoding;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.ObjectMapper;

public class JacksonTest {
	private JsonGenerator jsonGenerator = null;
    private ObjectMapper objectMapper = null;
    private AccountBean bean = null;
    File fl = new File("F:\\javadata\\think-in-java\\src\\user.json");
    JsonFactory factory = new JsonFactory();
    @Before
    public void init() throws IOException {
        bean = new AccountBean();
        bean.setAddress("china-Guangzhou");
        bean.setEmail("
 
[email protected]");
        bean.setId(1);
        bean.setName("hoojo");
        
        objectMapper = new ObjectMapper();
        factory.setCodec(objectMapper);
        jsonGenerator = factory.createGenerator(fl, JsonEncoding.UTF8);
    }
    @Test
    public void writeEntityJSON() throws Exception{
    	jsonGenerator.useDefaultPrettyPrinter();
    	jsonGenerator.writeObject(bean);
    	/*jsonGenerator.useDefaultPrettyPrinter();
    	jsonGenerator.writeStartObject();//開始寫入json格式的字串此語句相當於："{"  
    
  jsonGenerator.writeFieldName("name");//相當於key為"name"  
  jsonGenerator.writeString("Nacey");//相當於value為"Nacey"  
  jsonGenerator.writeStringField("sex", "male"); //方法同上//"sex":"male"  
    
  jsonGenerator.writeArrayFieldStart("Address"); //建立一個數組類似：Address:[  
  jsonGenerator.writeString("tel");  
  jsonGenerator.writeString("1555122120");  
  jsonGenerator.writeEndArray();  
    
  jsonGenerator.writeEndObject();//結束json物件  
  jsonGenerator.close(); */ 
    	AccountBean be = objectMapper.readValue(fl, AccountBean.class);  	
    	System.out.println(be.getAddress());
    }
    
    @After
    public void destory() {
        try {
            if (jsonGenerator != null) {
                jsonGenerator.flush();
            }
            objectMapper = null;
            bean = null;
            System.gc();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
</span>