在网页中想后台传递多个数据时，有时数据还是多个动态列表，数据很复杂时，JavaScript程序员喜欢把他们作为json串进行处理，后台收到后需要对json字符串进行解析，幸好有JSON-lib，这个Java类包用于把bean,map和XML转换成JSON并能够把JSON转回成bean和DynaBean。
下载地址:1 public class Test { 2 3 /** 4 5 * @param args 6 7 * @author wen 8 9 */ 10 11 public static void main(String[] args) { 12 13 // test1(); 14 15 // test2(); 16 17 String json = “{1:{1:{jhinfo:['计划一','亲亲宝宝','www.wenhq.com'],jhrate:['1-5:10.0','6-100:5.0/1']},2:{jhinfo:['计划二','亲亲宝宝','www.wenhq.com'],jhrate:['1-100:100.0']},3:{jhinfo:['计划三','亲亲宝宝','www.wenhq.com'],jhrate:['1-100:150.0/7']}},2:{4:{jhinfo:['年计划','亲亲宝宝','www.wenhq.com'],jhrate:['365-365:1000.0']}}}”; 18 19 try { 20 21 JSONObject jsonObject = JSONObject.fromObject(json); 22 23 String name = jsonObject.getString(“1″); 24 25 String address = jsonObject.getString(“2″); 26 27 System.out.println(“name is:” + name); 28 29 System.out.println(“address is:” + address); 30 31 Iterator it=jsonObject.keys(); 32 33 while (it.hasNext()){ 34 35 System.out.println(jsonObject.get(it.next())); 36 37 } 38 39 } catch (JSONException e) { 40 41 e.printStackTrace(); 42 43 } 44 45 } 46 47 /** 48 49 * json对象字符串转换 50 51 * @author wen 52 53 */ 54 55 private static void test2() { 56 57 String json = “{‘name’: ‘亲亲宝宝’,'array’:[{'a':'111','b':'222','c':'333'},{},{'a':'999'}],’address’:'亲亲宝宝’}”; 58 59 try { 60 61 JSONObject jsonObject = JSONObject.fromObject(json); 62 63 String name = jsonObject.getString(“name”); 64 65 String address = jsonObject.getString(“address”); 66 67 System.out.println(“name is:” + name); 68 69 System.out.println(“address is:” + address); 70 71 JSONArray jsonArray = jsonObject.getJSONArray(“array”); 72 73 for (int i = 0; i < jsonArray.size(); i++) { 74 75 System.out.println(“item ” + i + ” :” + jsonArray.getString(i)); 76 77 } 78 79 } catch (JSONException e) { 80 81 e.printStackTrace(); 82 83 } 84 85 } 86 87 /** 88 89 * json数组 转换，数组以[开头 90 91 * @author wen 92 93 */ 94 95 private static void test1() { 96 97 boolean[] boolArray = new boolean[]{true,false,true}; 98 99 JSONArray jsonArray1 = JSONArray.fromObject( boolArray );100 101 System.out.println( jsonArray1 );102 103 // prints [true,false,true]104 105 List list = new ArrayList();106 107 list.add( “first” );108 109 list.add( “second” );110 111 JSONArray jsonArray2 = JSONArray.fromObject( list );112 113 System.out.println( jsonArray2 );114 115 // prints ["first","second"]116 117 JSONArray jsonArray3 = JSONArray.fromObject( “['json','is','easy']” );118 119 System.out.println( jsonArray3 );120 121 // prints ["json","is","easy"]122 123 } 从json数组中得到相应java数组，如果要获取java数组中的元素，只需要遍历该数组。
1 /** 2 * 从json数组中得到相应java数组 3 * JSONArray下的toArray()方法的使用 4 * @param str 5 * @return 6 */ 7 public static Object[] getJsonToArray(String str) { 8 JSONArray jsonArray = JSONArray.fromObject(str); 9 return jsonArray.toArray();10 }11 12 public static void main(String[] args) { 13 JSONArray jsonStrs = new JSONArray();14 jsonStrs.add(0, "cat");15 jsonStrs.add(1, "dog");16 jsonStrs.add(2, "bird");17 jsonStrs.add(3, "duck");18 19 Object[] obj=getJsonToArray(jsonStrs.toString());20 for(int i=0;i 从json数组中得到java数组，可以对该数组进行转化，如将JSONArray转化为String型、Long型、Double型、Integer型、Date型等等。
分别采用jsonArray下的getString(index)、getLong(index)、getDouble(index)、getInt(index)等方法。 同样，如果要获取java数组中的元素，只需要遍历该数组。1 /** 2 * 将json数组转化为Long型 3 * @param str 4 * @return 5 */ 6 public static Long[] getJsonToLongArray(String str) { 7 JSONArray jsonArray = JSONArray.fromObject(str); 8 Long[] arr=new Long[jsonArray.size()]; 9 for(int i=0;i /**
* java转为json对象 * @author wudouzhu */public class JsonTest3 {public static void main(String[] args) {
SimInfo s = new SimInfo(); s.setAddTime("2000-10-21"); s.setIccid("23"); s.setId("243432435435365789"); s.setImei("423"); s.setImsi("545"); s.setPhoneType("1878789887"); s.setRemark("1"); s.setTel("0518-666678"); String json = new JSONArray().fromObject(s).toString(); System.out.println("json:"+json); //json:[{"addTime":"2000-10-21","iccid":"23","id":"243432435435365789","imei":"423","imsi":"545","phoneType":"1878789887","remark":"1","tel":"0518-666678"}]}
}
/**
* json转为java对象 * @author wudouzhu */public class JsonTest {public static void main(String[] args) {
String json="[{\"addTime\":\"2011-09-19 14:23:02\",\"iccid\":\"1111\",\"id\":0,\"imei\":\"2222\",\"imsi\":\"3333\",\"phoneType\":\"4444\",\"remark\":\"aaaa\",\"tel\":\"5555\"}]"; if(json.indexOf("[")!=-1){ json = json.replace("[",""); } if(json.indexOf("]")!=-1){ json = json.replace("]",""); } JSONObject object = JSONObject.fromObject(json); SimInfo simInfo = (SimInfo)JSONObject.toBean(object,SimInfo.class); System.out.println("obj:"+object); System.out.println(simInfo.getAddTime()); System.out.println(simInfo.getIccid()); System.out.println(simInfo.getId()); System.out.println(simInfo.getImei()); System.out.println(simInfo.getImsi()); System.out.println(simInfo.getPhoneType()); System.out.println(simInfo.getRemark()); System.out.println(simInfo.getTel()); }}/** * json转为java集合对象 * @author wudouzhu */public class JsonTest2 {
public static void main(String[] args) {
JsonTest2 t = new JsonTest2(); String jsons="[{\"addTime\":\"2011-09-19 14:23:02\",\"iccid\":\"1111\",\"id\":0,\"imei\":\"2222\",\"imsi\":\"3333\",\"phoneType\":\"4444\",\"remark\":\"aaaa\",\"tel\":\"5555\"}," + "{\"addTime\":\"2011-11-11 14:23:02\",\"iccid\":\"2222\",\"id\":0,\"imei\":\"2222\",\"imsi\":\"3333\",\"phoneType\":\"4444\",\"remark\":\"aaaa\",\"tel\":\"5555\"}]"; List<SimInfo> simInfos = t.getJavaCollection(new SimInfo(),jsons); System.out.println("size:"+simInfos.size()); for(SimInfo s:simInfos){ System.out.println("addTime:"+s.getAddTime()); System.out.println("=========="); } } /* * 封装将json对象转为java集合对象 */ private <T> List<T> getJavaCollection(T clazz,String jsons){ List<T> objs = null; JSONArray jsonArray = (JSONArray)JSONSerializer.toJSON(jsons); if(jsonArray!=null){ objs = new ArrayList<T>(); List list = (List)JSONSerializer.toJava(jsonArray); for(Object o:list){ JSONObject jsonObject = JSONObject.fromObject(o); T obj = (T)JSONObject.toBean(jsonObject,clazz.getClass()); objs.add(obj); } } return objs; }}