Map对象转换成Json格式的String字符串

太过爱你忘了你带给我的痛 2022-05-14 03:59 256阅读 0赞

//action处理页面发来的String，put到map转换成Json格式的String字符串  
  2     @RequestMapping("/seleteOaOrder")  
  3     @ResponseBody  
  4     public Object seleteOaOrder(String param)\{//param = "小明";  
  5         System.out.println("+++++++++++++++++param:"+param);  
  6         if(param!=null)\{  
  7             RequestEntity request = new RequestEntity();  
  8             request.setUserName("0755pss001");  
  9             request.setPwd("pss");  
 10             Map<String,String> map = new HashMap<String, String>();  
 11             map.put("applicant", param);  
 12             System.out.println("++++++++++++++++++转json之前的map对象："+map.toString());  
 13             ObjectMapper json = new ObjectMapper();  
 14             String params = null;  
 15             try \{  
 16                 //把map对象转成json格式的String字符串  
 17                 params = json.writeValueAsString(map);  
 18                 System.out.println("++++++++++++++++++转成的json格式字符串："+params);  
 19             \} catch (JsonGenerationException e) \{  
 20                 // TODO Auto-generated catch block  
 21                 e.printStackTrace();  
 22             \} catch (JsonMappingException e) \{  
 23                 // TODO Auto-generated catch block  
 24                 e.printStackTrace();  
 25             \} catch (IOException e) \{  
 26                 // TODO Auto-generated catch block  
 27                 e.printStackTrace();  
 28             \}  
 29             request.setParams(params);  
 30             ResponseEntity response = buyOrderService.seleteOaOrder(request);  
 31             return response.getResult();  
 32         \}  
 33         return null;  
 34     \}

--------------------------------------------------------------------------------  
 后台打印的结果：  
 转json之前的map对象：\{applicant:小明\}  
 转成的json格式字符串：\{"applicant":"小明"\};  
 在new Map对象的时候可以写成Map<String,Integer> map = new HashMap<String, Integer>();  
 这里param是一个int，等于2，  
 转json之前的map对象：\{applicant:2\}  
 转成的json格式字符串：\{"applicant":2\};这里param不会有双引号。  
 主要是用ObjectMapper（  
 import org.codehaus.jackson.JsonGenerationException;  
 import org.codehaus.jackson.map.JsonMappingException;  
 import org.codehaus.jackson.map.ObjectMapper;）  
 对map对象写成JSON格式的字符串。