java对象json字符串互转

暂时以知两种模式

  <dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>fastjson</artifactId>
     <version>1.1.15</version>
     <scope>compile</scope>
  </dependency>

1.  Java对象转字符串

String s = JSON.toJSONString(ret);

 

2.字符串转java对象

String js=”{\”name\”:\”bi”,\”age\”:23}”;

 

User user = JSON.parseObject(js,User.class);

User user =JSON.parseObject(js,new TypeReference<User>())

 

3.字符串转换为List

ArrayList<User>users = JSON.parseObject(js,newTypeReference<ArrayList<User>>(){});

 

4.字符串转化为对象数组

User[] users =JSON.parseObject(js,new TypeReference<User[]>(){});

对象数组转List

List list =Arrays.asList(users);

 

第二种方式

<dependency>
        <groupId>net.sf.json-lib</groupId>
        <artifactId>json-lib</artifactId>
        <version>2.4</version>
        <classifier>jdk15</classifier>
</dependency>

 

1. Java对象转字符串

String s =JSONObject.fromObject(obj).toString();

2 .Java对象列表转化为json对象数组

JSONArray array =JSONArray.fromObject(userList);

//转化为数组  array.toString();

 

 

3.字符串转java对象

  str ="{\"lendperson\":\"李四\",\"lendcompany\":\"有限公司\",\"checkperson\":\"李四\",
  \"lenddate\":\"2010-07-19T00:00:00\",\"lendcounts\":4,\"
  passports\":[{\"passportid\":\"d\",\"name\":\"李豫川\",\"passporttype\":\"K\"},
  {\"passportid\":\"K9051\",\"name\":\"李平\",\"passporttype\":\"K\"},
  {\"passportid\":\"K90517\",\"name\":\"袁寒梅\",\"passporttype\":\"K\"},
  {\"passportid\":\"K905199\",\"name\":\"贺明\",\"passporttype\":\"K\"}]}";

 

JSONObject jsonObject =JSONObject.fromObject(str);

User user =(User)JSONObject.toBean(jsonObject,User.class);

 

4.json字符串转为java对象数组

JSONArray json =JSONArray.fromObject(ss);

List<User> users =(List<User>)JSONArray.toCollection(json,User.class);