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将JSON数据转换为Java对象?

java json

将JSON数据转换为Java对象


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2020-01-10

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我将Google的Gson视为潜在的JSON插件。谁能提供某种形式的指导,说明如何从此JSON字符串生成Java?

Google Gson支持泛型和嵌套bean。[]JSON中的in表示一个数组,应映射到Java集合,例如List或仅映射到普通Java数组。{}JSON中的in代表一个对象,应映射到Java Map或某些JavaBean类。

你有一个带有多个属性的JSON对象,这些属性的groups属性表示同一类型的嵌套对象的数组。可以通过以下方式使用Gson进行解析:

package com.codingdict;

import java.util.List;
import com.google.gson.Gson;

public class Test {

    public static void main(String... args) throws Exception {
        String json =
            "{"
                + "'title': 'Computing and Information systems',"
                + "'id' : 1,"
                + "'children' : 'true',"
                + "'groups' : [{"
                    + "'title' : 'Level one CIS',"
                    + "'id' : 2,"
                    + "'children' : 'true',"
                    + "'groups' : [{"
                        + "'title' : 'Intro To Computing and Internet',"
                        + "'id' : 3,"
                        + "'children': 'false',"
                        + "'groups':[]"
                    + "}]"
                + "}]"
            + "}";

        // Now do the magic.
        Data data = new Gson().fromJson(json, Data.class);

        // Show it.
        System.out.println(data);
    }

}

class Data {
    private String title;
    private Long id;
    private Boolean children;
    private List<Data> groups;

    public String getTitle() { return title; }
    public Long getId() { return id; }
    public Boolean getChildren() { return children; }
    public List<Data> getGroups() { return groups; }

    public void setTitle(String title) { this.title = title; }
    public void setId(Long id) { this.id = id; }
    public void setChildren(Boolean children) { this.children = children; }
    public void setGroups(List<Data> groups) { this.groups = groups; }

    public String toString() {
        return String.format("title:%s,id:%d,children:%s,groups:%s", title, id, children, groups);
    }
}

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2020-01-10

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