json-lib使用

来源：互联网发布：42e5ers 网络直播编辑：程序博客网时间：2024/06/16 09:48

转自：http://log-cd.iteye.com/blog/469498

一、资源链接：

http://json-lib.sourceforge.net/
http://ezmorph.sourceforge.net/
http://morph.sourceforge.net/
http://www.json.org/javadoc/org/json/package-summary.html

二、例子

<span style="font-size:18px;">public class JsonUtil {/** * 从一个JSON 对象字符格式中得到一个java对象 说明：Bean的无参构造函数一定要写, 否则会报: * net.sf.json.JSONException: java.lang.NoSuchMethodException *  * @param jsonString * @param pojoCalss * @return */public static Object getObjectFromJsonString(String jsonString,Class pojoCalss) {Object pojo;JSONObject jsonObject = JSONObject.fromObject(jsonString);pojo = JSONObject.toBean(jsonObject, pojoCalss);return pojo;}/** * 将java对象转换成json字符串 *  * @param javaObj * @return */public static String getJsonStringFromObject(Object javaObj) {JSONObject json;json = JSONObject.fromObject(javaObj);return json.toString();}/** * 从json HASH表达式中获取一个map *  * @param jsonString * @return */@SuppressWarnings("unchecked")public static Map getMapFromJsonString(String jsonString) {JSONObject jsonObject = JSONObject.fromObject(jsonString);Iterator keyIter = jsonObject.keys();String key;Object value;Map valueMap = new HashMap();while (keyIter.hasNext()) {key = (String) keyIter.next();value = jsonObject.get(key);valueMap.put(key, value);}return valueMap;}/** * 从Map对象得到Json字串 *  * @param map * @return */public static String getJsonStringFromMap(Map map) {JSONObject json = JSONObject.fromObject(map);return json.toString();}/** * 从json字串中得到相应java数组 *  * @param jsonString *            like "[\"李斯\",100]" * @return */public static Object[] getObjectArrayFromJsonString(String jsonString) {JSONArray jsonArray = JSONArray.fromObject(jsonString);return jsonArray.toArray();}/** * 将list转换成Array *  * @param list * @return */public static Object[] getObjectArrayFromList(List list) {JSONArray jsonArray = JSONArray.fromObject(list);return jsonArray.toArray();}/** * 用JSONStringer构造一个JsonString *  * @param m * @return */public static String buildJsonString(Map m) {JSONStringer stringer = new JSONStringer();stringer.object();for (Object key : m.keySet()) {stringer.key((String) key).value((String)m.get(key));}stringer.key("phone");//begin nesting a arraystringer.array();stringer.value("13998098000");    stringer.value("8765432");    //nestring object in array    stringer.object();    stringer.key("ppcall");    stringer.value(53881);     stringer.endObject();    stringer.value("13990980980");    //end nesting a array    stringer.endArray();    stringer.endObject();return stringer.toString();}public static void printMap(Map map) {for (Object key : map.keySet()) {System.out.println(key + ":" + map.get(key));}}public static void main(String[] args) {Map m = new HashMap() {{put("JSon", "HelloWorld");put("Flex", "Ok");}};System.out.println(buildJsonString(m));System.out.println(new JSONStringer().object().key("JSON").value("Hello, World!").key("Flex").value("OK").endObject().toString());}}</span>

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