@文心快码objectmapper string转list 文心快码 使用ObjectMapper将JSON字符串转换为List对象,通常遵循以下步骤: 确定ObjectMapper库: ObjectMapper类是Jackson库的一部分,用于处理JSON数据的序列化和反序列化。确保项目中已经包含了Jackson库的依赖。例如,在Maven项目中,依赖配置可能如下: xml <dependency> <group...
objectMapper.getTypeFactory().constructParametricType()创建带有参数化的类型,如转List:objectMapper.getTypeFactory().constructParametricType(List.class, T.class). 3. 快速入门 准备实体类如下: @Getter @ToString static class JsonPerson { private String name; private String pwd; } 1. 2. 3. 4. 5. 6...
public static HashSet<Integer> strArrayTointSet(String[] strArray) { HashSet<Integer> sets = new HashSet<>(); // 先转List<Long> -- 使用Java8特性 -- stream 配合 lamda表达式 -- 批量转化str数组 --> long数组 List<Integer> list = Arrays.asList(strArray).stream().map(s -> Integer.p...
ObjectMapper将List和String互转 ObjectMapper将List和String互转ObjectMapper objectMapper = new ObjectMapper();List<Cell>cells=new ArrayList();//List转String String str= objectMapper.writeValueAsString(cells);//String转List List<Cell> cellList = objectMapper.readValue(str, new TypeReference<List<Cell>>()...
())); String jsonStr = mapper.writeValueAsString(studentList); System.out.println(jsonStr); List<Student> studentList2 = mapper.readValue(jsonStr, List.class); System.out.println("字符串转集合:" + studentList2 ); 结果: [ { "name" : "hyl1", "age" : 20, "sendTime" : ...
String jsonStr = mapper.writeValueAsString(user); System.out.println("对象转为字符串:"+ jsonStr); } 运行结果: 1 2 3 4 5 6 7 对象转为字符串:{ "id":1, "message":"Hello World", "sendTime":"2018-05-01 16:44:06", "intList": [1,2,...
readValue(String content, Class<T> valueType):读为指定class类型的对象,此方法最常用 readValue(String content, TypeReference<T> valueTypeRef):T表示泛型类型,如List<T>这种类型,一般用于集合/Map的反序列化 readValue(String content, JavaType valueType):Jackson内置的JavaType类型,后再详解(使用并不多) ...
readValue(String content, TypeReference<T> valueTypeRef):T表示泛型类型,如List<T>这种类型,一般用于集合/Map的反序列化 readValue(String content, JavaType valueType):Jackson内置的JavaType类型,后再详解(使用并不多) @Testpublic void test4() throws JsonProcessingException {ObjectMapper objectMapper = new ...
String转List @Test public void deserializeListTest() throws IOException { ObjectMapper objectMapper = new ObjectMapper(); // 结果输出到本地文件 List<User> userList = objectMapper.readValue("[{\"id\":20,\"name\":\"Jack1\"},{\"id\":21,\"name\":\"Jack2\"}]", new TypeReference<List...
第一种：public class JsonToJavaBean { public static void main(String[] args) { String str="{\"student\":[{\"name\":\"leilei\",\"age\":23},{\"name\":\"leilei02\",\"age\":23}]}";Student stu = null;List<Student> list = null;try { ObjectMapper objectMapper=new ...