java json字符串map互转

亦凉 2023-05-31 06:42 10阅读 0赞

**方法一 alibaba.fastjson (string to map):**

package data.test.demo;
    
    import java.util.Map;
    import com.alibaba.fastjson.JSONObject;
    
    public class Test { 
    	
    	public static void main(String[] args) { 
    		String jsonStr = 
    		"{\"a\":\"a1\",\"b\":\"b1\",\"c\":\"c1\",\"d\":\"d1\"}";
    		Map<String,Object> mapObj = 
    		JSONObject.parseObject(jsonStr,Map.class);
    	}
    	
    	
    }

**方法二 fasterxml.jackson (string to map) :**

package data.test.demo;
    
    import java.util.Map;
    import com.fasterxml.jackson.databind.ObjectMapper;
    
    public class Test { 
    	
    	public static void main(String[] args) { 
    		String jsonStr = 
    		"{\"a\":\"a1\",\"b\":\"b1\",\"c\":\"c1\",\"d\":\"d1\"}";
    		ObjectMapper mapper = new ObjectMapper();    
    		 paramsMap = null;
    		try { 
    			Map<String, String> map = 
    			mapper.readValue(jsonStr, Map.class);
    		} catch (Exception e) { 
    			logger.warn("{}|{}",requestsn,e);
    		}
    	}
    	
    	
    }

**map转string,方法一**

package data.test.demo;
    
    import java.util.Map;
    import com.alibaba.fastjson.JSONObject;
    
    public class Test { 
    	
    	public static void main(String[] args) { 
    		
    		try { 
    		HashMap<String, Object> map = new HashMap<String, Object>();
    		map.put("a","a1");
    		map.put("b","b1");
    			String mapStr = JSONObject.toJSONString(map);
    		} catch (Exception e) { 
    			logger.warn("{}|{}",requestsn,e);
    		}
    	}
    	
    	
    }

**map转string,方法二**

package data.test.demo;
    
    import java.util.Map;
    import com.alibaba.fastjson.JSON;
    import com.alibaba.fastjson.JSONObject;
    
    public class Test { 
    	
    	public static void main(String[] args) { 
    		
    		try { 
    		HashMap<String, Object> map = new HashMap<String, Object>();
    		map.put("a","a1");
    		map.put("b","b1");
    		//方法二转出来包含回车换行,用replaceAll("[\\s*\t\n\r]", "")去掉json字符串中的回车换行,方法一转出来不包含回车换行
    		String jsonStr = JSON.toJSONString(map,true).replaceAll("[\\s*\t\n\r]", "");
    		} catch (Exception e) { 
    			logger.warn("{}|{}",requestsn,e);
    		}
    	}
    	
    	
    }

实体类对象转json字符串

package com.test;
    
    import com.alibaba.fastjson.JSON;
    import com.test.ResultMessage;
    
    @Service
    public class Test{ 
    	
    	public static void main(String[] args) { 
    		ResultMessage zfresult = new ResultMessage("0000", "success", "0", "ok", "0", "ok", "", "", "");
    		String result = JSON.toJSONString(zfresult);
    		System.out.println(result);
    	}
    }