jackson

Spring Boot 内置 Jackson ，所以spring boot 默认json解析为jackson
jar：

		<dependency>
		    <groupId>com.fasterxml.jackson.core</groupId>
		    <artifactId>jackson-databind</artifactId>
		    <version>2.8.6</version>
		</dependency>

	@Test
	public void json2List() throws Exception{
		
		//json2Obj
		
		String json = "[{\"attr\":\"2\",\"updateTime\":\"2017-03-08 12:01:03\",\"id\":\"1\",\"product\":\"1\",\"status\":\"1\",\"unit\":\"2\"},{\"attr\":\"2\",\"id\":\"2\",\"product\":\"1\",\"status\":\"1\",\"unit\":\"2\"}]";
		DateFormat df = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
		jackjsonMapper.setDateFormat(df);
		JavaType javaType = jackjsonMapper.getTypeFactory().constructParametricType(List.class, Product.class);
		List<Product> readValue = jackjsonMapper.readValue(json, javaType);
		System.out.println(json);
		
		//obj2Json
		System.out.println(jackjsonMapper.writeValueAsString(readValue));
		//"updateTime":1488945381232
		DateFormat df2 = new SimpleDateFormat("yyyy-MM-dd");
		jackjsonMapper.setDateFormat(df2);
		System.out.println(jackjsonMapper.writeValueAsString(readValue));
		//"updateTime":"2017-03-08"
		
		System.out.println(0);
//		result:
//			[{"attr":"2","updateTime":"2017-03-08 12:01:03","id":"1","product":"1","status":"1","unit":"2"},{"attr":"2","id":"2","product":"1","status":"1","unit":"2"}]
//			[{"id":"1","product":"1","unit":"2","attr":"2","status":"1","updateTime":"2017-03-08 12:01:03"},{"id":"2","product":"1","unit":"2","attr":"2","status":"1","updateTime":null}]
//			[{"id":"1","product":"1","unit":"2","attr":"2","status":"1","updateTime":"2017-03-08"},{"id":"2","product":"1","unit":"2","attr":"2","status":"1","updateTime":null}]
	}