Json工具类

import java.io.IOException;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.List;

import com.fasterxml.jackson.annotation.JsonInclude.Include;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.DeserializationFeature;
import com.fasterxml.jackson.databind.JavaType;
import com.fasterxml.jackson.databind.ObjectMapper;


public class JsonMapper {

    private static final ObjectMapper jsonMapper;
    
    static {
    	jsonMapper = new ObjectMapper();
    	DateFormat df = new SimpleDateFormat("yyyy-MM-dd");
    	jsonMapper.setDateFormat(df);
    	jsonMapper.setSerializationInclusion(Include.NON_NULL);
    	jsonMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
    }
    
    public static String bean2Json(Object value){
    	try {
			return jsonMapper.writeValueAsString(value);
		} catch (JsonProcessingException e) {
			throw new RuntimeException(e);
		}
    }
    
    public static <T> T json2Bean(String json,Class<T> clazz){
    	try {
			return jsonMapper.readValue(json, clazz);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
    }
    
    public static <T> T json2Array(String json,TypeReference<?> type){
    	try {
			return jsonMapper.readValue(json, type);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
    }

	public static <T> List<T> json2List(String json, Class<T> clazz){
		try {
			JavaType type = jsonMapper.getTypeFactory().constructParametrizedType(List.class,List.class,clazz);
			return jsonMapper.readValue(json, type);
		} catch (IOException e) {
			throw new RuntimeException(e);
		}
	}
}