JSONUtil

介绍

JSONUtil是针对JSONObject定制软件和的静态快捷方法集合，定制软件在之前的章节我们已经定制软件介绍了一些工具方法，定制软件在本章节我们将做一些补充。

使用

1、JSON字符串创建

JSONUtil.toJsonStr可以将任意对象（Bean、Map、集合等）直接转换为JSON字符串。 如果对象是有序的Map等对象，则转换后的JSON字符串也是有序的。

    /**     * 转换为JSON字符串     * <p>     * 被转为JSON的对象     *     * @return JSON字符串     */    @Test    void toJsonStrTest() {        //map        SortedMap<Object, Object> sortedMap = new TreeMap<Object, Object>() {            private static final long serialVersionUID = 1L;            {                put("attributes", "a");                put("b", "b");                put("c", "c");            }        };        //对象        Student beanString = new Student(1, 1, 1, "张三");        //集合        List<Student> list = new ArrayList<>();        list.add(new Student(1, 1, 1, "张三"));        list.add(new Student(1, 1, 2, "李四"));        list.add(new Student(1, 1, 3, "王五"));        System.out.println("JSONUtil.toJsonStr(beanString) = " + JSONUtil.toJsonStr(beanString));        System.out.println("JSONUtil.toJsonStr(sortedMap) = " + JSONUtil.toJsonStr(sortedMap));        System.out.println("JSONUtil.toJsonStr(list) = " + JSONUtil.toJsonStr(list));    }
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结果

JSONUtil.toJsonStr(beanString) = {"gradeId":0,"studentId":1,"termId":1,"classId":1,"name":"张三"}JSONUtil.toJsonStr(sortedMap) = {"attributes":"a","b":"b","c":"c"}JSONUtil.toJsonStr(list) = [{"gradeId":0,"studentId":1,"termId":1,"classId":1,"name":"张三"},{"gradeId":0,"studentId":2,"termId":1,"classId":1,"name":"李四"},{"gradeId":0,"studentId":3,"termId":1,"classId":1,"name":"王五"}]
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如果我们想获得格式化后的JSON，则：

JSONUtil.toJsonPrettyStr(object);System.out.println("JSONUtil.toJsonPrettyStr(sortedMap) = " + JSONUtil.toJsonPrettyStr(sortedMap));
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结果

JSONUtil.toJsonPrettyStr(sortedMap) = {    "attributes": "a",    "b": "b",    "c": "c"}
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2、JSON字符串解析

    /**     * JSON字符串转JSONObject对象     * <p>     * JSON字符串     *     * @return JSONObject     */    @Test    void Test() {        String html = "{\"name\":\"Something must have been changed since you leave\"}";        JSONObject jsonObject = JSONUtil.parseObj(html);        System.out.println("jsonObject.getStr(\"name\") = " + jsonObject.getStr("name"));    }
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结果

jsonObject.getStr("name") = Something must have been changed since you leave
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3、XML字符串转换为JSON

    /**     * XML字符串转为JSONObject     *     *  XML字符串     * @return JSONObject     */    @Test    void parseFromXmlTest() {        String s = "<sfzh>123</sfzh><sfz>456</sfz><name>aa</name><gender>1</gender>";        JSONObject json = JSONUtil.parseFromXml(s);        System.out.println("json.get(\"sfzh\") = " + json.get("sfzh"));        System.out.println("json.get(\"name\") = " + json.get("name"));    }
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结果

json.get("sfzh") = 123json.get("name") = aa
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4、JSON转换为XML

    /**     * 转换为XML字符串     *     * @param json JSON     * @return XML字符串     */    @Test    void toXmlStrTest() {        final JSONObject put = JSONUtil.createObj()                .set("aaa", "你好")                .set("键2", "test");// <aaa>你好</aaa><键2>test</键2>        final String s = JSONUtil.toXmlStr(put);        System.out.println("s = " + s);    }
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结果

s = <aaa>你好</aaa><键2>test</键2>
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5、 JSON转Bean

我们先定义两个较为复杂的Bean（包含）

    @Data    public class ADT {        private List<String> BookingCode;    }    @Data    public class Price {        private List<List<ADT>> ADT;    }    /**     * JSON字符串转为实体类对象，转换异常将被抛出     *     * @param <T>        Bean类型     * @param jsonString JSON字符串     * @param beanClass  实体类对象     * @return 实体类对象     * @since 3.1.2     */    @Test    void toBeanTest() {        String json = "{\"ADT\":[[{\"BookingCode\":[\"N\",\"N\"]}]]}";        Price price = JSONUtil.toBean(json, Price.class);        System.out.println("price = " + price);    }
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