該篇主要以代碼示例爲主,由於google上不去,看不到Json-smart這個官方文檔和API。故只例舉一些代碼示例。由於接下來的Json-path底層默認使用的就是JsonSmart。JsonSmart的源碼並很少,有興趣能夠去看看java
import net.minidev.json.JSONArray; import net.minidev.json.JSONObject; import net.minidev.json.JSONValue; public class ParseJsonString { public static void main(String[] args) { /** * <pre> * [ * 0, * { * '1': { * '2': { * '3': { * '4': [ * 5, * { * '6': 7 * } * ] * } * } * } * } * ] * </pre> * */ String str="[0,{'1':{'2':{'3':{'4':[5,{'6':7}]}}}}]"; if (JSONValue.isValidJson(str)) { //判斷是不是合法的json字符串 Object obj=JSONValue.parse(str); JSONArray array=(JSONArray)obj; System.out.println(array.size()); System.out.println(array); JSONObject jsonObject = (JSONObject) array.get(1); System.out.println(jsonObject); JSONObject jsonObject1 = (JSONObject) jsonObject.get("1"); System.out.println(jsonObject1.toJSONString()); JSONObject jsonObject2 = (JSONObject) jsonObject1.get("2"); System.out.println(jsonObject2.toJSONString()); JSONObject jsonObject3 = (JSONObject) jsonObject2.get("3"); System.out.println(jsonObject3.toJSONString()); JSONArray array2 = (JSONArray) jsonObject3.get("4"); System.out.println(array2); JSONObject jsonObject4 = (JSONObject) array2.get(1); System.out.println(jsonObject4.toJSONString()); int data = Integer.parseInt(jsonObject4.get("6").toString()); System.out.println(data); } } }
輸出:git
2 [0,{"1":{"2":{"3":{"4":[5,{"6":7}]}}}}] {"1":{"2":{"3":{"4":[5,{"6":7}]}}}} {"2":{"3":{"4":[5,{"6":7}]}}} {"3":{"4":[5,{"6":7}]}} {"4":[5,{"6":7}]} [5,{"6":7}] {"6":7} 7
import java.io.IOException; import java.util.HashMap; import java.util.Map; import net.minidev.json.JSONObject; import net.minidev.json.JSONStyle; import net.minidev.json.JSONValue; import net.minidev.json.parser.ParseException; public class JsonValueTest { public static void main(String[] args) throws ParseException, IOException { // public class JSONObject extends HashMap<String, Object> // implements JSONAware, JSONAwareEx, JSONStreamAwareEx {} JSONObject obj = new JSONObject(); obj.put("name", "foo"); obj.put("num", 100); obj.put("balance", 1000.21); obj.put("is_vip", true); obj.put("is_special_fuhao", "'"); obj.put("nickname", null); // 判斷是不是合法的json串 System.out.println(JSONValue.isValidJson(obj.toJSONString())); // 轉義 quotes, \, /, \r, \n, \b, \f, \t and other control characters (U+0000 through U+001F). System.out.println(JSONValue.escape(obj.toJSONString())); System.out.println(obj.toJSONString()); System.out.println(JSONValue.toJSONString(obj)); // JSONStyle object configure JSonSerializer reducing output size System.out.println(obj.toJSONString(JSONStyle.NO_COMPRESS)); System.out.println(obj.toJSONString(JSONStyle.MAX_COMPRESS)); System.out.println(JSONValue.toJSONString(obj, JSONStyle.MAX_COMPRESS)); System.out.println(JSONValue.compress(obj.toJSONString())); System.out.println(JSONValue.uncompress(obj.toJSONString())); System.out.println(JSONValue.uncompress(JSONValue.toJSONString(obj, JSONStyle.MAX_COMPRESS))); // Parse Json input to a java Object keeping element order System.out.println(JSONValue.parseKeepingOrder(obj.toJSONString())); // 解析字符串的時候會拋異常 throw ParseException System.out.println(JSONValue.parseWithException(obj.toJSONString())); System.out.println("**********************************"); String str="{\"key\":\"Value\"}"; Object obj1=JSONValue.parse(str); System.out.println(obj1); obj1=JSONValue.parseStrict(str); System.out.println(obj1); JSONObject obj2=(JSONObject)obj1; System.out.println(obj2.get("key")); System.out.println("**********************************"); StringBuffer strBuffer = new StringBuffer("zhangsan"); Map<String, Object> map = new HashMap<String, Object>(); map.put("hello", "world"); map.put("hello1", "world1"); map.put("hello2", "world2"); JSONValue.writeJSONString(map, strBuffer, JSONStyle.NO_COMPRESS); // JSONValue.writeJSONString(map, strBuffer, JSONStyle.MAX_COMPRESS); // 若是設置JSONStyle.MAX_COMPRESS,那麼strBuffer輸出: zhangsan{hello:world,hello2:world2,hello1:world1} System.out.println(strBuffer); } }
輸出:github
true {\"balance\":1000.21,\"num\":100,\"nickname\":null,\"is_vip\":true,\"name\":\"foo\",\"is_special_fuhao\":\"'\"} {"balance":1000.21,"num":100,"nickname":null,"is_vip":true,"name":"foo","is_special_fuhao":"'"} {"balance":1000.21,"num":100,"nickname":null,"is_vip":true,"name":"foo","is_special_fuhao":"'"} {"balance":1000.21,"num":100,"nickname":null,"is_vip":true,"name":"foo","is_special_fuhao":"'"} {balance:1000.21,num:100,is_vip:true,name:foo,is_special_fuhao:"'"} {balance:1000.21,num:100,is_vip:true,name:foo,is_special_fuhao:"'"} {balance:1000.21,num:100,nickname:null,is_vip:true,name:foo,is_special_fuhao:"'"} {"balance":1000.21,"num":100,"nickname":null,"is_vip":true,"name":"foo","is_special_fuhao":"'"} {"balance":1000.21,"num":100,"is_vip":true,"name":"foo","is_special_fuhao":"'"} {balance=1000.21, num=100, nickname=null, is_vip=true, name=foo, is_special_fuhao='} {"balance":1000.21,"num":100,"is_vip":true,"nickname":null,"name":"foo","is_special_fuhao":"'"} ********************************** {"key":"Value"} {"key":"Value"} Value ********************************** zhangsan{"hello":"world","hello2":"world2","hello1":"world1"}
JSONValue中全部的parse方法內部都是調用JSONParser實現的parse的方法。json
JSONValue.parse() 和 JSONValue.parseStrict() 功能是一致的。區別是JSONValue.parse()不會拋出異常,而JSONValue.parseStrict()會拋出ParseException異常。ide
JSONValue.parseStrict()和JSONValue.parseWithException() 都會拋出ParseException異常,單從輸出結果看兩者是同樣的,區別是JSONValue.parseStrict()的解析輸入的json文本的有效性是依據RFC4627。而JSONValue.parseWithException()解析輸入的json文本內容依據默認的解析文本的模式。this
import java.io.ByteArrayInputStream; import java.io.IOException; import java.io.StringReader; import net.minidev.json.JSONObject; import net.minidev.json.JSONValue; import net.minidev.json.writer.JsonReader; public class JsonReaderTest { static String[] nonLatinTexts = new String[] { "සිංහල ජාතිය", "日本語", "Русский", "فارسی", "한국어", "Հայերեն", "हिन्दी", "עברית", "中文", "አማርኛ", "മലയാളം", "ܐܬܘܪܝܐ", "მარგალური" }; public static void main(String[] args) throws IOException { String text = "{'new':'foo','default':'bar'}"; JSONValue.remapField(TRen.class, "default", "default_"); JSONValue.remapField(TRen.class, "new", "new_"); TRen t = JSONValue.parse(text, TRen.class); System.out.println(JSONValue.toJSONString(t)); System.out.println("*******************************"); for (String nonLatinText : nonLatinTexts) { String s = "{\"key\":\"" + nonLatinText + "\"}"; // 1. StringReader reader = new StringReader(s); // JSONObject obj = (JSONObject) JSONValue.parse(reader); // 2. ByteArrayInputStream bis = new ByteArrayInputStream(s.getBytes("utf8")); // JSONObject obj = (JSONObject) JSONValue.parse(bis); // 3. byte[] bs = s.getBytes("utf8"); // JSONObject obj = (JSONObject) JSONValue.parse(bs); JSONObject obj = (JSONObject) JSONValue.parse(s); String v = (String) obj.get("key"); // result is incorrect System.out.print(v + ", "); } System.out.println(); } public static class TRen { public String new_; public String default_; } }
輸出google
{"default":"bar","new":"foo"} ******************************* සිංහල ජාතිය, 日本語, Русский, فارسی, 한국어, Հայերեն, हिन्दी, עברית, 中文, አማርኛ, മലയാളം, ܐܬܘܪܝܐ, მარგალური,
import java.util.ArrayList; import java.util.List; import net.minidev.json.JSONArray; import net.minidev.json.JSONObject; import net.minidev.json.JSONValue; public class JsonToObject { public static void main(String[] args) { People people = new People(); people.setName("test1"); people.setAge(13); people.setMobile(20130808); People people1 = new People(); people1.setName("test"); people1.setAge(123); people1.setMobile(888666); List<People> array = new ArrayList<People>(); array.add(people); array.add(people1); JSONObject obj = new JSONObject(); obj.put("peoples", array); System.out.println(JSONValue.toJSONString(obj)); JSONArray jsonArray = new JSONArray(); jsonArray.add(people); jsonArray.add(people1); JSONObject result = new JSONObject(); result.put("peoples", jsonArray); System.out.println(JSONValue.toJSONString(result)); } } class People { public String name; public int age; public boolean single; public long mobile; public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public boolean isSingle() { return single; } public void setSingle(boolean single) { this.single = single; } public long getMobile() { return mobile; } public void setMobile(long mobile) { this.mobile = mobile; } }
輸出:編碼
{"peoples":[{"single":false,"age":13,"name":"test1","mobile":20130808},{"single":false,"age":123,"name":"test","mobile":888666}]} {"peoples":[{"single":false,"age":13,"name":"test1","mobile":20130808},{"single":false,"age":123,"name":"test","mobile":888666}]}
參考文檔:
Json-smart在gitHub上的代碼
JsonSmart文檔code