java读取json数据并解析输出对象

有勇气的牛排 477 Java 2023-05-17 23:44:06

文章目录

1 源数据
2 方案

2.1 maven 阿里 fastjson

2.1.1 解析JSON对象
2.1.2 解析JSON对象数组

1 源数据

{
    "code":200,
    "msg":"success",
    "data":{
        "name":"导演",
        "age":20,
        "sex":"girl"
    }
}

{
    "code":200,
    "msg":"success",
    "data":[
         {
        "name":"导演",
        "age":20,
        "sex":"girl"
    },{
        "name":"灰太狼",
        "age":21,
        "sex":"boy"
    },{
        "name":"有勇气的牛排",
        "age":19,
        "sex":"girl"
    }
   ]
}

2 方案

2.1 maven 阿里 fastjson

fastjson地址
fastjson指南

安卓版本（未测）

http://repo1.maven.org/maven2/com/alibaba/fastjson/1.1.51.android/

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.28</version>
</dependency>

2.1.1 解析JSON对象

String jsonData="{\n" +
                "    \"code\":200,\n" +
                "    \"msg\":\"success\",\n" +
                "    \"data\":{\n" +
                "        \"name\":\"导演\",\n" +
                "        \"age\":20,\n" +
                "        \"sex\":\"girl\"\n" +
                "    }\n" +
                "}";

//先把String对象转换成json对象
JSONObject object= JSONObject.parseObject(jsonData);

System.out.println(object.get("code"));
System.out.println(object.getJSONObject("data").get("name"));
System.out.println(object.getJSONObject("data").get("age"));
System.out.println(object.getJSONObject("data").get("sex"));

2.1.2 解析JSON对象数组

String jsonData="{\n" +
                "    \"code\":200,\n" +
                "    \"msg\":\"success\",\n" +
                "    \"data\":[\n" +
                "         {\n" +
                "        \"name\":\"导演\",\n" +
                "        \"age\":20,\n" +
                "        \"sex\":\"girl\"\n" +
                "    },{\n" +
                "        \"name\":\"灰太狼\",\n" +
                "        \"age\":21,\n" +
                "        \"sex\":\"boy\"\n" +
                "    },{\n" +
                "        \"name\":\"有勇气的牛排\",\n" +
                "        \"age\":19,\n" +
                "        \"sex\":\"girl\"\n" +
                "    }\n" +
                "   ]\n" +
                "}";

//先把String对象转换成json对象
JSONObject object= JSONObject.parseObject(jsonData);

List<HashMap> list =JSON.parseArray((object.get("data")).toString(), HashMap.class);
for(int i=0;i<list.size();i++){
    System.out.println(list.get(i).get("name"));;
}

参考文章
https://www.runoob.com/w3cnote/fastjson-intro.html
https://qushen.blog.csdn.net/article/details/83515840

<h3>文章目录</h3><ul><ul><li><a href="#1__2">1 源数据</a></li><li><a href="#2__37">2 方案</a></li><ul><li><a href="#21_maven__fastjson_38">2.1 maven 阿里 fastjson</a></li><ul><li><a href="#211_JSON_56">2.1.1 解析JSON对象</a></li><li><a href="#212_JSON_82">2.1.2 解析JSON对象数组</a></li></ul></ul></ul></ul> <h2><a id="1__2"></a>1 源数据</h2> <pre><div class="hljs"><code class="lang-json">{ "code":200, "msg":"success", "data":{ "name":"导演", "age":20, "sex":"girl" } } </code></div></pre> <pre><div class="hljs"><code class="lang-json">{ "code":200, "msg":"success", "data":[ { "name":"导演", "age":20, "sex":"girl" },{ "name":"灰太狼", "age":21, "sex":"boy" },{ "name":"有勇气的牛排", "age":19, "sex":"girl" } ] } </code></div></pre> <h2><a id="2__37"></a>2 方案</h2> <h3><a id="21_maven__fastjson_38"></a>2.1 maven 阿里 fastjson</h3> <ol> <li> <a href="https://github.com/alibaba/fastjson" target="_blank">fastjson地址</a> </li> <li> <a href="https://github.com/alibaba/fastjson/wiki/Quick-Start-CN" target="_blank">fastjson指南</a> </li> <li> 安卓版本（未测） <pre><div class="hljs"><code class="lang-java">http://repo1.maven.org/maven2/com/alibaba/fastjson/1.1.51.android/ </code></div></pre> </li> </ol> <pre><div class="hljs"><code class="lang-xml"><dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.28</version> </dependency> </code></div></pre> <h4><a id="211_JSON_56"></a>2.1.1 解析JSON对象</h4> <pre><div class="hljs"><code class="lang-java">String jsonData="{\n" + " \"code\":200,\n" + " \"msg\":\"success\",\n" + " \"data\":{\n" + " \"name\":\"导演\",\n" + " \"age\":20,\n" + " \"sex\":\"girl\"\n" + " }\n" + "}"; </code></div></pre> <pre><div class="hljs"><code class="lang-java">//先把String对象转换成json对象 JSONObject object= JSONObject.parseObject(jsonData); System.out.println(object.get("code")); System.out.println(object.getJSONObject("data").get("name")); System.out.println(object.getJSONObject("data").get("age")); System.out.println(object.getJSONObject("data").get("sex")); </code></div></pre> <img src="https://static.couragesteak.com/article/a7c8fdb72ca049dd171cc9d932ef066e.png" alt="image.png" /> <h4><a id="212_JSON_82"></a>2.1.2 解析JSON对象数组</h4> <pre><div class="hljs"><code class="lang-java">String jsonData="{\n" + " \"code\":200,\n" + " \"msg\":\"success\",\n" + " \"data\":[\n" + " {\n" + " \"name\":\"导演\",\n" + " \"age\":20,\n" + " \"sex\":\"girl\"\n" + " },{\n" + " \"name\":\"灰太狼\",\n" + " \"age\":21,\n" + " \"sex\":\"boy\"\n" + " },{\n" + " \"name\":\"有勇气的牛排\",\n" + " \"age\":19,\n" + " \"sex\":\"girl\"\n" + " }\n" + " ]\n" + "}"; </code></div></pre> <pre><div class="hljs"><code class="lang-java">//先把String对象转换成json对象 JSONObject object= JSONObject.parseObject(jsonData); List<HashMap> list =JSON.parseArray((object.get("data")).toString(), HashMap.class); for(int i=0;i<list.size();i++){ System.out.println(list.get(i).get("name"));; } </code></div></pre> <img src="https://static.couragesteak.com/article/3fa9cee35b181ed3ff744abd4d32b65a.png" alt="image.png" /> 参考文章 https://www.runoob.com/w3cnote/fastjson-intro.html https://qushen.blog.csdn.net/article/details/83515840