Map与Json之间的转化

1.Map转化成JSON

package com.dbzhang.demo;


import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import com.fasterxml.jackson.core.JsonParseException;
import com.fasterxml.jackson.core.type.TypeReference;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;
public class Json2Map {


	/**
	 * 该方法主要是用来将json字符串转化成map集合
	 * @param args
	 * @throws IOException 
	 * @throws JsonMappingException 
	 * @throws JsonParseException 
	 */
	public static void main(String[] args){
		
		String json = "{\"name\":\"zdb\",\"age\":\"26\"}";
		Map map = new HashMap();
		ObjectMapper mapper = new ObjectMapper();
		try {
			map = mapper.readValue(json, new TypeReference>() {
			});
			System.out.println(map);
		} catch (JsonParseException e) {
			e.printStackTrace();
		} catch (JsonMappingException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
	}


}

输出结果如下：

2.将Map转化成JSON:

package com.dbzhang.demo;

import java.util.HashMap;
import java.util.Map;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class Map2Json {

	/**
	 * 这个类主要将map转化成json
	 * @param args
	 */
	public static void main(String[] args) {
		
		ObjectMapper mapper = new ObjectMapper();
		Map map = new HashMap();
		String json = "";
		map.put("name", "zdb");
		map.put("age", "25");
		try {
			json = mapper.writeValueAsString(map);
			System.out.println(json);
		} catch (JsonProcessingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}

}

输出结果：

3.map转成Json文件：

package com.dbzhang.demo;

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

import com.fasterxml.jackson.core.JsonGenerationException;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class Map2JsonFile {

	/**
	 * 这个方法主要是用来将map转化成Json文件
	 * @param args
	 */
	public static void main(String[] args) {
		ObjectMapper mapper = new ObjectMapper();
		Map map = new HashMap();
		map.put("name", "lisi");
		map.put("age", 28);
		List