Json字符串转换为java对象
SpringMVC+mybatis HTML5 全新高大尚后台框架_集成代码生成器
1.??Json字符串转换为java对象
1.1.? Json字符串转换为java bean
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Json2Bean.java |
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package jackson; ? import java.io.IOException; ? import org.codehaus.jackson.map.ObjectMapper; ? public class Json2Bean { ? ?? public static void main(String[] args) throws IOException{ ? ????? String jsonStr = "{\"name\":\"Morris\",\"age\":\"22\",\"sex\":\"男\"}"; ????? ????? ObjectMapper mapper = new ObjectMapper(); ????? ????? Person person = mapper.readValue(jsonStr, Person.class); ????? ????? System.out.println(person); ?? } ? } ? |
1.2.? Json字符串转换为java List集合
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Json2List.java |
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package jackson; ? import java.io.IOException; import java.util.LinkedHashMap; import java.util.List; ? import org.codehaus.jackson.map.ObjectMapper; ? public class Json2List { ? ?? public static void main(String[] args) throws IOException { ? ????? String jsonStr = "[{\"name\":\"Bob\",\"age\":\"33\",\"sex\":\"女\"}," ?????????? + "{\"name\":\"Morris\",\"age\":\"22\",\"sex\":\"男\"}]"; ????? ????? ObjectMapper mapper = new ObjectMapper(); ????? ????? List<LinkedHashMap<String, String>> list = mapper.readValue(jsonStr, List.class); ????? ????? for (LinkedHashMap<String, String> linkedHashMap : list) { ??????? for (String key:linkedHashMap.keySet()) { ??????? ?? System.out.println(key+":"+linkedHashMap.get(key)); ??????? } ????? } ?? } ? } ? |
运行结果如下:
name:Bob
age:33
sex:女
name:Morris
age:22
sex:男
1.3.? Json字符串转换为java Map集合
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Json2Map.java |
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package jackson; ? import java.io.IOException; import java.util.Map; import java.util.Set; ? import org.codehaus.jackson.map.ObjectMapper; ? public class Json2Map { ? ?? public static void main(String[] args) throws IOException { ? ????? String jsonStr = "{\"success\":true,\"A\":{\"address\": \"address2\",\"name\":\"haha2\",\"id\":2,\"email\":\"email2\"},"+ ??????????????? "\"B\":{\"address\":\"address\",\"name\":\"haha\",\"id\":1,\"email\":\"email\"}}"; ????? ????? ObjectMapper mapper = new ObjectMapper(); ????? ????? Map map = mapper.readValue(jsonStr, Map.class); ????? ????? Set keySet = map.keySet(); ????? ????? for (Object key : keySet) { ??????? System.out.println(key+":"+map.get(key)); ????? } ? ?? } ? } ? |
运行结果如下:
success:true
A:{address=address2, name=haha2, id=2,email=email2}
B:{address=address, name=haha, id=1,email=email}
1.4.? Json字符串转换为数组
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Json2Array.java |
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package jackson; ? import java.io.IOException; ? import org.codehaus.jackson.map.ObjectMapper; ? public class Json2Array { ? ?? public static void main(String[] args) throws IOException { ????? ????? String jsonStr = "[{\"name\":\"Bob\",\"age\":\"33\",\"sex\":\"女\"}," ?????????? + "{\"name\":\"Morris\",\"age\":\"22\",\"sex\":\"男\"}]"; ????? ????? ObjectMapper mapper = new ObjectMapper(); ????? ????? Person[] persons = mapper.readValue(jsonStr, Person[].class); ????? ????? for (Person person : persons) { ??????? System.out.println(person); ????? } ????? ????? ? ?? } ? } ? |
运行结果如下:
Person [name=Bob, age=33, sex=女]
Person [name=Morris, age=22, sex=男]
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