在前面的博客中说明了json-lib如何序列化和反序列化。现在说明下jackson-mapper-lgpl （以下简称jackson）的用法。
jackson 官网：http://jackson.codehaus.org/
jackson 依赖的jar包：
maven 依赖配置：
Xml代码
- <!-- Json转化模块 -->
- <dependency>
- <groupId>org.codehaus.jackson</groupId>
- <artifactId>jackson-mapper-lgpl</artifactId>
- <version>1.9.9</version>
- </dependency>
使用jackson 序列化Java对象，即把java对象转化json 字符串：
Java代码
- @Test
- public void test_serialize2(){
- ObjectMapper mapper = new ObjectMapper();
- Class2 c=new Class2();
- List<Student>students=new ArrayList<Student>();
- Student student=new Student();
- Map<String, Object> attribute =new HashMap<String, Object>();
- attribute.put("p1", "v1");
- attribute.put("p2", "v2");
- student.setAttribute(attribute);
- students.add(student);
- student.setName("黄威");
- student.setHobby("Roller-Skating");
- c.setStudents(students);
- c.setClassName("计算机0705");
- String content;
- try {
- content = mapper.writeValueAsString(student);
- System.out.println(content);
- } catch (JsonGenerationException e) {
- e.printStackTrace();
- } catch (JsonMappingException e) {
- e.printStackTrace();
- } catch (IOException e) {
- e.printStackTrace();
- }
运行结果：
{"addrr":null,"age":0,"name":"黄威","hobby":"Roller-Skating","attribute":{"p2":"v2","p1":"v1"}}
使用jackson 反序列化，即把json字符串或inputstream 还原为java对象
Java代码
- @Test
- public void test_reserialize(){
- String jsonInput = "{\"addrr\":{\"country\":\"中国\",\"state\":\"湖北省\",\"street\":\"清河\"},\"age\":25,\"hobby\":\"\",\"name\":\"黄威\"}";
- ObjectMapper mapper = new ObjectMapper();
- Student student;
- try {
- student = mapper.readValue(jsonInput, Student.class);
- System.out.println(student.getAddrr().getStreet());
- System.out.println(student.getName());
- } catch (Exception e) {
- e.printStackTrace();
- }
- }
运行结果：
Java代码
- 清河
- 黄威
