java使用json-lib库的json工具类.

import net.sf.ezmorph.object.DateMorpher;
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import net.sf.json.JsonConfig;
import net.sf.json.processors.JsonValueProcessor;
import net.sf.json.util.CycleDetectionStrategy;
import net.sf.json.util.JSONUtils;

 

/**

 * 处理json的工具类，负责json数据转换成java对象和java对象转换成json

 *

 * @since 2012年7月4日22:36:43

 * @author leaves,QQ：1330771552

 */

public class JsonUtil {

    /**

     * 从一个JSON 对象字符格式中得到一个java对象

     *

     * @param jsonString

     * @param pojoCalss

     * @return

     */

    @SuppressWarnings("unchecked")

    public static <T> T jsonToObject(String jsonString, Class<T> pojoCalss) {

        Object pojo;

        JSONObject jsonObject = JSONObject.fromObject(jsonString);

        pojo = JSONObject.toBean(jsonObject, pojoCalss);

        return (T) pojo;

    }

 

    /**

     * json字符串转换成集合

     *

     * @param jsonString

     * @param pojoClass

     * @return

     */

    @SuppressWarnings("unchecked")

    public static <T> List<T> jsonToList(String jsonString, Class<T> pojoClass) {

        JSONArray jsonArray = JSONArray.fromObject(jsonString);

        JSONObject jsonObject;

        Object pojoValue;

        List<T> list = new ArrayList<T>();

        for (int i = 0; i < jsonArray.size(); i++) {

            jsonObject = jsonArray.getJSONObject(i);

            pojoValue = JSONObject.toBean(jsonObject, pojoClass);

            list.add((T) pojoValue);

        }

        return list;

    }

 

    /**

     * json字符串转换成集合

     *

     * @param jsonString

     * @param pojoClass

     * @return

     */

    @SuppressWarnings("unchecked")

    public static <T> List<T> jsonToList(String jsonString, Class<T> pojoClass, String dataFormat) {

        JsonConfig jsonConfig = configJson(dataFormat);

        JSONArray jsonArray = JSONArray.fromObject(jsonString, jsonConfig);

        JSONObject jsonObject;

        Object pojoValue;

        List<T> list = new ArrayList<T>();

        for (int i = 0; i < jsonArray.size(); i++) {

            jsonObject = jsonArray.getJSONObject(i);

            pojoValue = JSONObject.toBean(jsonObject, pojoClass);

            list.add((T) pojoValue);

        }

        return list;

    }

 

    /**

     * 将java对象转换成json字符串

     *

     * @param javaObj

     * @return

     */

    public static String objectToJson(Object javaObj) {

        JSONObject json;

        json = JSONObject.fromObject(javaObj);

        return json.toString();

    }

 

    /**

     * 将java对象转换成json字符串,并设定日期格式

     *

     * @param javaObj

     *            要转换的java对象

     * @param dataFormat

     *            制定的日期格式

     * @return

     */

    public static String objectToJson(Object javaObj, String dataFormat) {

        JSONObject json;

        JsonConfig jsonConfig = configJson(dataFormat);

        json = JSONObject.fromObject(javaObj, jsonConfig);

        return json.toString();

 

    }

 

    /**

     * list变成json

     *

     * @param list

     * @return

     */

    public static <T> String listToJson(List<T> list) {

        JSONArray json;

        json = JSONArray.fromObject(list);

        return json.toString();

    }

 

    /**

     * list变成json

     *

     * @param list

     * @return

     */

    public static <T> String listToJson(List<T> list, String dataFormat) {

        JSONArray json;

        JsonConfig jsonConfig = configJson(dataFormat);

        json = JSONArray.fromObject(list, jsonConfig);

        return json.toString();

    }

 

    /**

     * JSON 时间解析器

     *

     * @param datePattern

     * @return

     */

    public static JsonConfig configJson(final String datePattern) {

 

        JSONUtils.getMorpherRegistry().registerMorpher(new DateMorpher(new String[] { datePattern }));

 

        JsonConfig jsonConfig = new JsonConfig();

        jsonConfig.setIgnoreDefaultExcludes(false);

        jsonConfig.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);

        jsonConfig.registerJsonValueProcessor(Date.class, new JsonValueProcessor() {

 

            @Override

            public Object processObjectValue(String key, Object value, JsonConfig jsonConfig) {

                if (value instanceof Date) {

                    String str = new SimpleDateFormat(datePattern).format((Date) value);

                    return str;

                }

                return value == null ? null : value.toString();

            }

 

            @Override

            public Object processArrayValue(Object value, JsonConfig jsonConfig) {

                String[] obj = {};

                if (value instanceof Date[]) {

                    SimpleDateFormat sf = new SimpleDateFormat(datePattern);

                    Date[] dates = (Date[]) value;

                    obj = new String[dates.length];

                    for (int i = 0; i < dates.length; i++) {

                        obj[i] = sf.format(dates[i]);

                    }

                }

                return obj;

            }

        });

        return jsonConfig;

    }

}

 

 

 

data=[{"xuHao":"201407140001","scaleNo":"01","qrCode":"440100100002B993","beforeWeight":15.85,"fillingWeight":30.50,"steelno":"013267","fillingWorkerID":"","fillingDate":"2014-07-14 09:29:01"},{"xuHao":"201507140002","scaleNo":"01","qrCode":"4401001000013475","beforeWeight":15.85,"fillingWeight":30.50,"steelno":"003212","fillingWorkerID":"","fillingDate":"2015-07-14 09:33:01"}]

 

String strObject=request.getParameter("data");

FillingDetailRecordsEntity requestBean=(FillingDetailRecordsEntity)jsonToObject(strObject,FillingDetailRecordsEntity.class);

 

 

json lib 2.4及其依赖包下载

 

下载文件地址：https://files.cnblogs.com/files/xiandedanteng/json-lib-2.4%26dependencies_jars.rar

它包括

commons-beanutils-1.9.3.jar

commons-collections-3.2.jar

commons-lang-2.3.jar

commons-logging-1.2.jar

ezmorph-1.0.6.jar

json-lib-2.4-jdk15.jar

这些库可以满足转化Java对象到json的需要。

 

在线JSON字符串转Java实体类(JavaBean、Entity)

在线JSON字符串转Java实体类(JavaBean)

http://www.bejson.com/json2javapojo/new/