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);
    }

}

jackson-all-1.6.1.jar (841.5 KB)