使用com.fasterxml.jackson将对象转换为JSON字符串或反转

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示例：

import com.fasterxml.jackson.databind.ObjectMapper;


      Iterable areaItera = areaRepository.findAll();
		
	 StringWriter writer = new StringWriter();
         ObjectMapper mapper = new ObjectMapper();
         try {
			mapper.writeValue(writer, areaItera);
		} catch (JsonGenerationException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (JsonMappingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
   
		System.out.println("areaString:"+writer.toString());

                Map> blockMap = mapper.readValue(writer.toString(), Map.class); 

                System.out.println(blockMap.toString());

转载于:https://my.oschina.net/zhangmaoyuan/blog/1606278