使用JackSon将对象和集合转为Json

使用JackSon将对象和集合转为Json

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首先三个jar

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demo

package com.xieth.test;

import java.util.Arrays;
import java.util.List;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

public class Customer {

    private String name;
    private String id;

    public String getCustomerName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getCity() {
        return "BeiJing";
    }

    public String getBirth(){
        return "1990-12-12";
    }

    public Customer() {
        super();
    }

    public Customer(String name, String id) {
        super();
        this.name = name;
        this.id = id;
    }

    public static void main(String[] args) {
        // 1. 导入jar包
        // 2. 创建 ObjectMapper 对象
        ObjectMapper mapper= new ObjectMapper();

        // 3. 调用 writeValueAsString 方法把一个对象 转为
        Customer customer = new Customer("xth", "1001");
        try {
            // Jackson 通过 getter 方法来定位 JSON 对象的属性
            String jsonStr = mapper.writeValueAsString(customer);
            // 可以 通过注解的方式来忽略 getter 定义的属性
//          System.out.println(jsonStr);
            // 集合的方式
            List customers = Arrays.asList(customer, new Customer("YR", "1002"));
            jsonStr = mapper.writeValueAsString(customers);
            System.out.println(jsonStr);
        } catch (JsonProcessingException e) {
            e.printStackTrace();
        }

    }
}

运行

[{"id":"1001","customerName":"xth","birth":"1990-12-12","city":"BeiJing"},{"id":"1002","customerName":"YR","birth":"1990-12-12","city":"BeiJing"}]

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