zl-opd-gather/src/main/java/com/hb/proj/utils/JacksonUtils.java

package com.hb.proj.utils;

import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.type.CollectionType;

public class JacksonUtils {

	//private static final Logger logger = LoggerFactory.getLogger(JacksonUtils.class);
	
	private final static ObjectMapper mapper = new ObjectMapper();
	
	public static String getJSON(Object obj){
		try {
			return mapper.writeValueAsString(obj);
		}
		catch(Exception e) {
    		throw new RuntimeException("jackson序列化对象时出错");
    	}
	}

    public static <T> List<T>  getList(String json,Class<T> cls){
    	try {
    		return mapper.readValue(json, new TypeReference<List<T>>() {});
    	}
    	catch(Exception e) {
    		throw new RuntimeException("jackson参数转换出错");
    	}
    	
    }
    
    public static <T> List<T>  getList2(String json,Class<T> cls){
    	try {
    		CollectionType listType =
    				mapper.getTypeFactory().constructCollectionType(ArrayList.class, cls);
    		return mapper.readValue(json,listType);
    	}
    	catch(Exception e) {
    		throw new RuntimeException("jackson参数转换出错");
    	}
    	
    }
    
    public static List<Map<String,Object>>  getMaps(String json){
    	try {
    		return mapper.readValue(json, new TypeReference<List<Map<String,Object>>>() {});
    	}
    	catch(Exception e) {
    		throw new RuntimeException("jackson参数转换出错");
    	}
    	
    }
    
    @SuppressWarnings("unchecked")
	public static Map<String,Object>  getMap(String json){
    	try {
    		return mapper.readValue(json, Map.class);
    	}
    	catch(Exception e) {
    		throw new RuntimeException("jackson参数转换出错");
    	}
    }
    
    public static <T> T  get(String json,Class<T> cls) {
    	try {
    		return mapper.readValue(json, cls);
    	}
    	catch(Exception e) {
    		throw new RuntimeException("jackson参数转换出错");
    	}
    }
    
    public static <T>  T  readFile(File file,Class<T> cls) {
    	try{
    		return mapper.readValue(file, cls);
    	}
    	catch(Exception e) {
    		throw new RuntimeException("jackson参数json文件转换出错");
    	}
    }
    
    public static void writeFile(File file,Object datas) {
    	try {
			mapper.writeValue(file, datas);
		} catch (Exception e) {
			e.printStackTrace();
		} 
    }
}