Java对象序列化与反序列化一 JSON
1. 依赖库
jackson-all-1.6.1.jar
2. 代码
public class Student {
private String name;
private int age;
public Student(){
}
public Student(String name, int age) {
super();
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
public class Grade {
public String name = "wang";
public int f1 = 100;
}
public enum Color {
RED, GREEN, BLUE
}
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.type.TypeReference;
public class JsonTest {
public static void main(String[] args)throws Exception {
ObjectMapper mapper = new ObjectMapper(); // can reuse, share globally
mapper.registerSubtypes(Student.class);
//对象
String serialValue = mapper.writeValueAsString(new Student("wang", 20));
System.out.println(serialValue);
Student student = mapper.readValue(serialValue, Student.class);
System.out.println(student.getName());
//数组
String[] arr1 = {"111", "222"};
serialValue = mapper.writeValueAsString(arr1);
System.out.println(serialValue);
String[] arr2 = mapper.readValue(serialValue, String[].class);
System.out.println(arr2[0]);
//集合
List<Student> list1 = new ArrayList<Student>();
list1.add(new Student("wang", 20));
list1.add(new Student("zhang", 21));
serialValue = mapper.writeValueAsString(list1);
System.out.println(serialValue);
List<Student> list2 = mapper.readValue(serialValue, new TypeReference<List<Student>>(){});
System.out.println(list2.get(0).getName());
//MAP
Map<Integer, String> map1 = new HashMap<Integer, String>();
map1.put(1, "11");
map1.put(2, "22");
serialValue = mapper.writeValueAsString(map1);
System.out.println(serialValue);
Map<Integer, String> map2 = mapper.readValue(serialValue, new TypeReference<Map<Integer, String>>(){});
System.out.println(map2.get(1));
//枚举
Color color = Color.RED;
serialValue = mapper.writeValueAsString(color);
System.out.println(serialValue);
Color color2 = mapper.readValue(serialValue, Color.class);
System.out.println(color2);
//注入测试
serialValue = mapper.writeValueAsString(new Student("",{wang}[]:,"", 20));
System.out.println(serialValue);
Student student3 = mapper.readValue(serialValue, Student.class);
System.out.println(student3.getName());
serialValue = mapper.writeValueAsString(new Grade());
System.out.println(serialValue);
Grade g = mapper.readValue(serialValue, Grade.class);
System.out.println(g.name);
}
}