标签：turn ash ide 习惯 actor 简单 stty getname ble
POJO序列化为json字符串：
准备一个POJO：
@JsonIgnoreProperties(ignoreUnknown = true)
class User implements Serializable {
private static final long serialVersionUID = -5952920972581467417L;
private String name;
public User() {
}
public User(String name) {
this.name = name;
}
public String getName() {
return name;
}
@Override
public String toString() {
return "User{" +
"name=" + name +
‘}‘;
}
}
@JsonIgnoreProperties(ignoreUnknown = true) 是为了反序列化的时候，如果遇到不认识的filed，忽略之
通过write来转化成jason字符串：
String expected = "{\"name\":\"Test\"}";
String test = mapper.writeValueAsString(new User("Test"));
Assert.assertEquals(expected, test);
通过read来parse json字符串为POJO对象：
User user = mapper.readValue(expected, User.class);
Assert.assertEquals("Test", user.getName());
jsonArray转换成Array数组：
String expected = "[{\"name\":\"Ryan\"},{\"name\":\"Test\"},{\"name\":\"Leslie\"}]";
ArrayType arrayType = mapper.getTypeFactory().constructArrayType(User.class);
User[] users = mapper.readValue(expected, arrayType);
Assert.assertEquals("Ryan", users[0].getName());
jsonArray转换成List<>泛型：
expected="[{\"a\":12},{\"b\":23},{\"name\":\"Ryan\"}]";
CollectionType listType = mapper.getTypeFactory().constructCollectionType(ArrayList.class, User.class);
//the sieze of the list is dependon the str json length although the json content is not the POJO type maybe
List<User> userList = mapper.readValue(expected, listType);
Assert.assertEquals(3, userList.size());
Assert.assertNull(userList.get(0).getName());
Assert.assertEquals("Ryan",userList.get(2).getName());
jackson默认将对象转换为LinkedHashMap：
String expected = "[{\"name\":\"Ryan\"},{\"name\":\"Test\"},{\"name\":\"Leslie\"}]";
ArrayList arrayList = mapper.readValue(expected, ArrayList.class);
Object o = arrayList.get(0);
Assert.assertTrue(o instanceof LinkedHashMap);
转载：http://www.cnblogs.com/woshimrf/p/5847262.html
标签：turn ash ide 习惯 actor 简单 stty getname ble
原文地址：http://www.cnblogs.com/cainiao-Shun666/p/6872678.html
