java 谷歌josn解析框架 Gson

有勇气的牛排 1014 Java 2021-10-19 16:37:57

1 介绍

导包 maven

<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
<dependency>
    <groupId>com.google.code.gson</groupId>
    <artifactId>gson</artifactId>
    <version>2.8.8</version>
</dependency>

安卓Gradle

// https://mvnrepository.com/artifact/com.google.code.gson/gson
implementation group: 'com.google.code.gson', name: 'gson', version: '2.8.8'

2 json数据

{
    "errorCode":200,
    "errorMsg":"success",
    "data":[
        {
            "name":"charles",
            "age":20
        },
        {
            "name":"tom",
            "age":21
        }
    ]
}

3 解析json

3.1 bean

package gson;

import java.util.List;

public class UserBean {
    private int errorCode;
    private String errorMsg;
    private List<DataBean> data;

    public int getErrorCode() {
        return errorCode;
    }

    public void setErrorCode(int errorCode) {
        this.errorCode = errorCode;
    }

    public String getErrorMsg() {
        return errorMsg;
    }

    public void setErrorMsg(String errorMsg) {
        this.errorMsg = errorMsg;
    }

    public List<DataBean> getData() {
        return data;
    }

    public void setData(List<DataBean> data) {
        this.data = data;
    }

    public static class DataBean {
        private String name;
        private String age;

        public String getName() {
            return name;
        }

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

        public String getAge() {
            return age;
        }

        public void setAge(String age) {
            this.age = age;
        }
    }
}

3.2 主方法

package gson;

import com.google.gson.Gson;

import java.util.List;

public class gson {

    public static void main(String[] args) {
        List<UserBean.DataBean> data;
        int errorCode = 0;
        String errorMsg = null;

        String userData = "{\n" +
                "    \"errorCode\":200,\n" +
                "    \"errorMsg\":\"success\",\n" +
                "    \"data\":[\n" +
                "        {\n" +
                "            \"name\":\"charles\",\n" +
                "            \"age\":20\n" +
                "        },\n" +
                "        {\n" +
                "            \"name\":\"tom\",\n" +
                "            \"age\":21\n" +
                "        }\n" +
                "    ]\n" +
                "}";

        Gson gson = new Gson();

        // json 反序列化
        UserBean userBean = gson.fromJson(userData, UserBean.class);

        // 获取错误码
        errorCode = userBean.getErrorCode();
        // 获取错误信息
        errorMsg = userBean.getErrorMsg();
        // 获取人员信息
        data = userBean.getData();

        System.out.println(errorCode);
        System.out.println(errorMsg);

        System.out.println(data.get(0).getName());

        System.out.println(data.size());

        for(int i = 0;i<data.size();i++){
            System.out.println("--------");
            System.out.println(data.get(i).getName());
            System.out.println(data.get(i).getAge());
            System.out.println("--------");
        }

    }
}

输出
Gson案例输出

<h2><a id="1__0"></a>1 介绍</h2> 导包 maven <pre><div class="hljs"><code class="lang-xml"> <dependency> <groupId>com.google.code.gson</groupId> <artifactId>gson</artifactId> <version>2.8.8</version> </dependency> </code></div></pre> 安卓Gradle <pre><div class="hljs"><code class="lang-shell">// https://mvnrepository.com/artifact/com.google.code.gson/gson implementation group: 'com.google.code.gson', name: 'gson', version: '2.8.8' </code></div></pre> <h2><a id="2_json_17"></a>2 json数据</h2> <pre><div class="hljs"><code class="lang-json">{ "errorCode":200, "errorMsg":"success", "data":[ { "name":"charles", "age":20 }, { "name":"tom", "age":21 } ] } </code></div></pre> <h2><a id="3_json_35"></a>3 解析json</h2> <h3><a id="31_bean_36"></a>3.1 bean</h3> <pre><div class="hljs"><code class="lang-java">package gson; import java.util.List; public class UserBean { private int errorCode; private String errorMsg; private List<DataBean> data; public int getErrorCode() { return errorCode; } public void setErrorCode(int errorCode) { this.errorCode = errorCode; } public String getErrorMsg() { return errorMsg; } public void setErrorMsg(String errorMsg) { this.errorMsg = errorMsg; } public List<DataBean> getData() { return data; } public void setData(List<DataBean> data) { this.data = data; } public static class DataBean { private String name; private String age; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAge() { return age; } public void setAge(String age) { this.age = age; } } } </code></div></pre> <h3><a id="32__94"></a>3.2 主方法</h3> <pre><div class="hljs"><code class="lang-java">package gson; import com.google.gson.Gson; import java.util.List; public class gson { public static void main(String[] args) { List<UserBean.DataBean> data; int errorCode = 0; String errorMsg = null; String userData = "{\n" + " \"errorCode\":200,\n" + " \"errorMsg\":\"success\",\n" + " \"data\":[\n" + " {\n" + " \"name\":\"charles\",\n" + " \"age\":20\n" + " },\n" + " {\n" + " \"name\":\"tom\",\n" + " \"age\":21\n" + " }\n" + " ]\n" + "}"; Gson gson = new Gson(); // json 反序列化 UserBean userBean = gson.fromJson(userData, UserBean.class); // 获取错误码 errorCode = userBean.getErrorCode(); // 获取错误信息 errorMsg = userBean.getErrorMsg(); // 获取人员信息 data = userBean.getData(); System.out.println(errorCode); System.out.println(errorMsg); System.out.println(data.get(0).getName()); System.out.println(data.size()); for(int i = 0;i<data.size();i++){ System.out.println("--------"); System.out.println(data.get(i).getName()); System.out.println(data.get(i).getAge()); System.out.println("--------"); } } } </code></div></pre> 输出 <img src="https://static.couragesteak.com/article/672ec92d30dbf02ffdb051eef799e8e8.png" alt="Gson案例输出" />