JSONObject序列化包含Date类型数据的Java对象

1、引入依赖包：

<dependency>
    <groupId>net.sf.json-lib</groupId>
    <artifactId>json-lib</artifactId>
    <version>2.4</version>
    <classifier>jdk15</classifier>
</dependency>
<dependency>
    <groupId>commons-beanutils</groupId>
    <artifactId>commons-beanutils</artifactId>
    <version>1.7.0</version>
</dependency>
<dependency>
    <groupId>commons-collections</groupId>
    <artifactId>commons-collections</artifactId>
    <version>3.1</version>
</dependency>
<dependency>
    <groupId>commons-lang</groupId>
    <artifactId>commons-lang</artifactId>
    <version>2.5</version>
</dependency>
<dependency>
    <groupId>net.sf.ezmorph</groupId>
    <artifactId>ezmorph</artifactId>
    <version>1.0.3</version>
</dependency>
<dependency>
    <groupId>commons-logging</groupId>
    <artifactId>commons-logging</artifactId>
    <version>1.2</version>
</dependency>

2、创建日期处理器类

public class JsonDateValueProcessor implements JsonValueProcessor {

    private String format = "yyyy-MM-dd HH:mm:ss";

    public JsonDateValueProcessor() {
        super();
    }

    public JsonDateValueProcessor(String format) { // 自己需要的格式
        super();
        this.format = format;
    }

    @Override
    public Object processArrayValue(Object value, JsonConfig paramJsonConfig) {
        return process(value);
    }

    @Override
    public Object processObjectValue(String key, Object value, JsonConfig paramJsonConfig) {
        return process(value);
    }

    private Object process(Object value) {
        if (value instanceof Date) {
            SimpleDateFormat sdf = new SimpleDateFormat(format, Locale.CHINA);
            return sdf.format(value);
        }
        return value == null ? "" : value.toString();
    }
}

3、使用方式

•     单个bean

JsonConfig jsonConfig = new JsonConfig();
jsonConfig.registerJsonValueProcessor(Date.class, new JsonDateValueProcessor());
JSONObject json = new JSONObject();  
json.fromObject(object, jsonConfig)

•    List<bean>

List<Object> objects = new ArrayList<>();
JsonConfig jsonConfig = new JsonConfig();
jsonConfig.registerJsonValueProcessor(Date.class, new JsonDateValueProcessor());
JSONArray taskArray = JSONArray.fromObject(objects, jsonConfig);

•     Map

JsonConfig jsonConfig = new JsonConfig();
jsonConfig.registerJsonValueProcessor(Date.class, new JsonDateValueProcessor());
JSONObject json = new JSONObject();
json.putAll(Map, jsonConfig);