json-lib date对象转json ，加入自定义日期格式处理

import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
import net.sf.json.processors.JsonValueProcessor;   

public class DateJsonValueProcessor implements JsonValueProcessor {
    public static final String DEFAULT_DATE_PATTERN = "yyyy-MM-dd HH:mm:ss";
    private DateFormat dateFormat;   

    /**
     * 构造方法.
     *
     * @param datePattern 日期格式
     */
    public DateJsonValueProcessor(String datePattern) {
        try {
            dateFormat = new SimpleDateFormat(datePattern);
        } catch (Exception ex) {
            dateFormat = new SimpleDateFormat(DEFAULT_DATE_PATTERN);
        }
    }   

    public Object processArrayValue(Object value, JsonConfig jsonConfig) {
        return process(value);
    }   

    public Object processObjectValue(String key, Object value,
            JsonConfig jsonConfig) {
        return process(value);
    }   

    private Object process(Object value) {
        if (value == null) {
            value = new Date();   //为null时返回当前日期，也可以返回"",看需要
        }
        return dateFormat.format((Date) value);
    }   

    public static String map2JSonStr(Map map) {
        JsonConfig jsonConfig = new JsonConfig();
        DateJsonValueProcessor beanProcessor = new DateJsonValueProcessor(
                DEFAULT_DATE_PATTERN);
        jsonConfig.registerJsonValueProcessor(Date.class, beanProcessor);   

        JSONObject jsonObject = JSONObject.fromObject(map, jsonConfig);   

        return jsonObject.toString();
    }      

    //将对象转换为json string，使用上面定义的的日期格式
    @SuppressWarnings("unchecked")
    public static JSONObject obj2JsonObj(Object obj) {
        JsonConfig jsonConfig = new JsonConfig();
        DateJsonValueProcessor beanProcessor = new DateJsonValueProcessor(
                DEFAULT_DATE_PATTERN);
        jsonConfig.registerJsonValueProcessor(Date.class, beanProcessor);   

        JSONObject jsonObject = JSONObject.fromObject(obj, jsonConfig);   

        return jsonObject;
    }
}  

import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
import net.sf.json.processors.JsonValueProcessor;

public class DateJsonValueProcessor implements JsonValueProcessor {
    public static final String DEFAULT_DATE_PATTERN = "yyyy-MM-dd HH:mm:ss";
    private DateFormat dateFormat;

    /**
     * 构造方法.
     *
     * @param datePattern 日期格式
     */
    public DateJsonValueProcessor(String datePattern) {
        try {
            dateFormat = new SimpleDateFormat(datePattern);
        } catch (Exception ex) {
            dateFormat = new SimpleDateFormat(DEFAULT_DATE_PATTERN);
        }
    }

    public Object processArrayValue(Object value, JsonConfig jsonConfig) {
        return process(value);
    }

    public Object processObjectValue(String key, Object value,
            JsonConfig jsonConfig) {
        return process(value);
    }

    private Object process(Object value) {
        if (value == null) {
            value = new Date();   //为null时返回当前日期，也可以返回"",看需要
        }
        return dateFormat.format((Date) value);
    }

    public static String map2JSonStr(Map map) {
        JsonConfig jsonConfig = new JsonConfig();
        DateJsonValueProcessor beanProcessor = new DateJsonValueProcessor(
                DEFAULT_DATE_PATTERN);
        jsonConfig.registerJsonValueProcessor(Date.class, beanProcessor);

        JSONObject jsonObject = JSONObject.fromObject(map, jsonConfig);

        return jsonObject.toString();
    }    

    //将对象转换为json string，使用上面定义的的日期格式
    @SuppressWarnings("unchecked")
    public static JSONObject obj2JsonObj(Object obj) {
        JsonConfig jsonConfig = new JsonConfig();
        DateJsonValueProcessor beanProcessor = new DateJsonValueProcessor(
                DEFAULT_DATE_PATTERN);
        jsonConfig.registerJsonValueProcessor(Date.class, beanProcessor);

        JSONObject jsonObject = JSONObject.fromObject(obj, jsonConfig);

        return jsonObject;
    }
}