[Android开发] Json解析工具类，一个类搞定Json的解析一、简介利用递归的方式反射解析到bean里面二、详细代码1、Json格式例如服务器指定规定json格式为:{"code": "……" , // 返回代号，预留字段，默认返回null"type":"ERROR", // 返回类型，表示操作是成功或失败"desc":"……", // 返回描述，描述性文字，主要保存用于弹窗显示的文字"action":"SHOW", //返回操作，该操作值提供给终端使用，用于决定当前收到返回后的操作"data": "……" // 返回数据，根据请求上传的参数，返回对应的数据，或返回null}对应的数据在data里面，data里面的key对应一个bean，例如一个列表数据:{"desc":"查询成功","data":{"diseaseList":[{"xmlName":"精神病评估","xmlId":"1066","category":"symptom"},{"xmlName":"对学习困难和认知延迟的评估","xmlId":"884","category":"symptom"},{"xmlName":"疲乏的评估","xmlId":"571","category":"symptom"},{"xmlName":"痴呆的评估","xmlId":"242","category":"symptom"},{"xmlName":"非故意性体重减轻评估","xmlId":"548","category":"symptom"}]},"action":null,"code":"","type":"SUCCESS"}2、定义数据Bean类上面的list的bean定义为DiseaseList.Javapublic class DiseaseList {/*** xmlName : 分裂情感性障碍* xmlId : 1199* category : disease*/private String xmlName; //症状名字private String xmlId; //症状名字private String category; //分类的英文名private String letter = ""; //字母，转为拼音后在这里添加public String getXmlName() {return xmlName;}public void setXmlName(String xmlName) {this.xmlName = xmlName;}public String getXmlId() {return xmlId;}public void setXmlId(String xmlId) {this.xmlId = xmlId;}public String getCategory() {return category;}public void setCategory(String category) { this.category = category;}public String getLetter() {return letter;}public void setLetter(String letter) {this.letter = letter;}}3、定义根key的bean类Response.java:/*** json返回的首key的内容类**/public class Response {//下面四个是固定写在第一层的private String code;private String type;private String desc;private String action;//Object 可以存放listprivate HashMap<String,Object> datas = new HashMap<String,Object>(); //存放对象(一般是list)，根据String这个id来取//存放data里面的基本类型private HashMap<String,Object> dataValue = new HashMap<>();public Response() {code = type = desc = action /*= version = token = applyAuthenticateId*/ = "";}public final static String TOKEN = "token";public final static String VERSION = "version";public final static String PORTRAIT = "portrait";public final static String USERID = "userId";public final static String APPL YAUTHENTICA TEID = "applyAuthenticateId";public final static String ISDOCTOR = "isDoctor";public final static String ISEXPERT = "isExpert";public final static String WAY = "way";public final static String DOWNLOAD = "download";/*** 存值到hashmap里面* @param key* @param value*/public void put(String key, Object value) {datas.put(key, value);}/*** 获取key对应的对象* @param key key* @param <T> 返回的对象* @return hashMap的key对应的值*/public <T> T get(String key){if(datas.containsKey(key)){return (T)datas.get(key);}return null;}/*** 反射执行，添加到hashMap,data里面的基本类型数据* @param key* @param value*/public void addDataValue(String key, Object value){dataValue.put(key,value);}/*** 获取data里面的基本类型数据* @param key* @param <T>* @return*/public <T> T getDataV alue(String key){if(dataValue.containsKey(key)){return (T)dataValue.get(key);}return null;}public String getCode() {return code;}public void setCode(String code) {if(null != code && !"".equals(code.trim()))this.code = code;}public String getDesc() {return desc;}public void setDesc(String desc) {if(!TextUtils.isEmpty(desc))this.desc = desc;}}4、定义反射类枚举json解析时候根据key在这里获取到对应的类实例DA TA.java:/*** json解析的时候的类*/public enum DATA {//疾病列表DISEASELIST("diseaseList",DiseaseList.class);private final String mId;private final Class cls;public Class getClzss() {return cls;}DA TA(String id, Class clzss) {mId = id;cls = clzss;}/*** 根据json的key获取类* @param id* @return*/public static DA TA fromId(String id) {DATA[] values = values();int cc = values.length;for (int i = 0; i < cc; i++) {if (values[i].mId.equals(id)) {return values[i];}}return null;}@Overridepublic String toString() {return mId;}}5、Json解析工具类对应的注释已经写到代码里面了JsonResolveUtils.java/*** json解析工具类*/public class JsonResolveUtils {private static final String SET = "set";private static final String PUT = "put";/*** 开始解析json 字符串，解析为Response类bean形式** @param response json字符串* @param cls Response类class* @param <T> 泛型，这里传递了Response* @return*/public static <T> T parseJsonToResponse(String response, Class<T> cls) {if (null != response) {try {// 构建JSONObject 实例JSONObject json = new JSONObject(response);// JSONObject 解析成具体Bean实例T entity = toResponse(json, cls);return entity;} catch (JSONException e) {e.printStackTrace();} catch (InstantiationException e) {e.printStackTrace();} catch (IllegalAccessException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();}}return null;}/*** JSONObject解析成Response Bean实例** @param json json对象* @param cls 转换的对象，这里是Response* @param <T> 转换的对象，这里是Response* @return 返回Response对象* @throws IllegalAccessException* @throws InstantiationException*/public static <T> T toResponse(JSONObject json, Class<T> cls) throws IllegalAccessException, InstantiationException {//声明一个Response实例T instance = null;if (null != json) {// 获取根keyIterator<String> iterator = json.keys();//构建个实例Response Beaninstance = cls.newInstance();//开始遍历根keywhile (iterator.hasNext()) {try {String key = iterator.next(); //获取keyObject value = json.get(key); //获取key对应的值//值不为空if (null != value) {if (!key.equals("data")) {//不是data数据，直接为Response的Bean属性赋值setter(instance, key, value);} else { // 解析data数据if (value instanceof JSONObject) {//data 数据是JSONObject 开始解析json对象数据parseJsonBean((JSONObject) value, instance);} else if (value instanceof JSONArray) {//data 数据是JSONArray 开始解析json数组数据toBeanArray((JSONArray) value, instance);} else {//若都不是，直接为ResponseBean属性赋值setter(instance, key, value);}}}} catch (Exception e) {e.printStackTrace();}} // while(~)}return instance;}/*** 解析单个JSON数据** @param json json* @param instance Bean实例* @param <T>*/public static <T> void parseJsonBean(JSONObject json, T instance) {//json不为空if (null != json) {//获取json的key iteratorIterator<String> iterator = json.keys();while (iterator.hasNext()) {//获取键值对String key = iterator.next();Object value = null;try {//获取值value = json.get(key);//value不为空if (null != value) {// value 为json对象则把json解析成具体的实例Beanif (value instanceof JSONObject) {// 获取对应的实例Bean ClassDATA clzss = DA TA.fromId(key);//不为空if (null != clzss) {//把json解析成该实例BeanObject entity = toBean((JSONObject) value, clzss.getClzss());//把当前Bean类缓存在上级Bean属性里putter(instance, entity.getClass(), key, entity);}} else if (value instanceof JSONArray) { //value 为json 数据对象，则把jsonarray解析成ArrayList<Bean>// 获取对应的实例Bean ClassDATA clzss = DA TA.fromId(key);if (null != clzss) {//把json解析成ArrayList<Bean>Object entity = parseBeanArray((JSONArray) value, clzss.getClzss());//把当前ArrayList<Bean>缓存在上级Bean属性里putter(instance, entity.getClass(), key, entity);}} else {//都是不是，直接为上级Bean属性赋值if (instance instanceof Response) {//dada下面的标准类型的值设置进Respone的dataStringsetDataString(instance,key, value.toString());} else {putter(instance, value.getClass(), key, value);}}}} catch (Exception e) {e.printStackTrace();}}}}/*** 设置Response的dataString** @param obj* @param key* @param value* @param <T>*/private static <T> void setDataString(Object obj, String key, String value) {//值不为空if (null == value)return;try {//获取addDataString方法,参数1 为方法名，2为类型Method method = obj.getClass().getMethod("addDataValue", String.class, Object.class);//调用set方法赋值method.invoke(obj, key, value);} catch (Exception e) {e.printStackTrace();}}/*** 解析JSON成具体实例Bean** @param json json数据* @param cls 要解析成为的实例* @param <T> 返回实例* @return* @throws IllegalAccessException* @throws InstantiationException*/public static <T> T toBean(JSONObject json, Class<T> cls) throws IllegalAccessException, InstantiationException {//声明实例引用T instance = null;//json不为空if (null != json) {//获取json key 的迭代器；Iterator<String> iterator = json.keys();//构建实例Beaninstance = cls.newInstance();//遍历json keywhile (iterator.hasNext()) {//获取键值对String key = iterator.next();Object value = null;try {value = json.get(key);//value不为空if (null != value) {// value 为json对象则把json解析成具体的实例Beanif (value instanceof JSONObject) {// 获取对应的实例Bean ClassDATA clzss = DA TA.fromId(key);if (null != clzss) {//把json解析成该实例BeanObject entity = toBean((JSONObject) value, clzss.getClzss());//把当前Bean类缓存在上级Bean属性里putter(instance, entity.getClass(), key, entity);}} else if (value instanceof JSONArray) { //value 为json数组对象，则把jsonarray解析成ArrayList<Bean>// 获取对应的实例Bean ClassDATA clzss = DA TA.fromId(key);if (ull != clzss) {//把json解析成ArrayList<Bean>Object entity = parseBeanArray((JSONArray) value, clzss.getClzss());//把当前ArrayList<Bean>缓存在上级Bean属性里putter(instance, entity.getClass(), key, entity);}} else {//都是不是，直接为上级Bean属性赋值setter(instance, key, value);}}} catch (Exception e) {e.printStackTrace();}}}return instance;}/*** 解析json里面的json数组,例如专家列表** @param jsonarr* @param cls* @param <T>* @return*/public static <T> ArrayList<Object> parseBeanArray(JSONArray jsonarr, Class<T> cls) {//声明集合List引用ArrayList<Object> beanArray = null;//声明实例引用T instance = null; // if areaif (null != jsonarr && jsonarr.length() > 0) {beanArray = new ArrayList<Object>();int count = jsonarr.length();Object value = null;for (int index = 0; index < count; index++) {try {value = jsonarr.get(index);if (value instanceof String) {beanArray.add(value);continue;} else {//构造实例Beaninstance = cls.newInstance();// value 为json对象则把json解析成具体的实例Beanif (value instanceof JSONObject) {parseJsonBean((JSONObject) value, instance);} else if (value instanceof JSONArray) {//value 为json 数组对象，则解析jsonarraytoBeanArray((JSONArray) value, instance);}//解析完成后将Bean添加到ListbeanArray.add(instance);}} catch (Exception e) {e.printStackTrace();}}}return beanArray;}/*** 解析data的key 的json数组** @param jsonarr json数据* @param instance Response实例* @param <T>* @return*/public static <T> T toBeanArray(JSONArray jsonarr, T instance) {if (null != jsonarr && jsonarr.length() > 0) {int count = jsonarr.length();Object value = null;for (int index = 0; index < count; index++) {try {value = jsonarr.get(index);if (value instanceof JSONObject) {parseJsonBean((JSONObject) value, instance);} else if (value instanceof JSONArray) {toBeanArray((JSONArray) value, instance);}} catch (JSONException e) {e.printStackTrace();}}}return instance;}/*** 调用obj类的get参数menber方法** @param obj* @param member* @param <T>* @return*/public static <T> T getter(Object obj, String member) {try {Method method = obj.getClass().getMethod("get" + updateFirst(member));return (T) method.invoke(obj);} catch (Exception e) {return null;}}/*** 反射的方法获取** @param obj* @param member* @param <T>* @return*/public static <T> T getterIgnoreCase(Object obj, String member) {try {Method method = obj.getClass().getMethod("get" + member);return (T) method.invoke(obj);} catch (Exception e) {return null;}}/*** 为obj实例的属性赋值** @param obj 目标实例* @param clzss set方法形参类型* @param value 属性值*/public static void putter(Object obj, Class<?> clzss, Object... value) {//值不为空if (null == value)return;try {//获取key对应的set方法,参数1 为方法名，2为类型Method method = obj.getClass().getMethod(SET + updateFirst((String) value[0]), clzss);//调用set方法赋值method.invoke(obj, value[1]);} catch (Exception e) {//若obj没有对应的set方法try {//获取obj的put方法Method method = obj.getClass().getMethod(PUT, value[0].getClass(), Object.class);//把属性值put入map里缓存method.invoke(obj, value);//System.out.println(obj.getClass()+ "调用"+value[0].toString()+" "+((ArrayList)value[1])ze());} catch (Exception ex) {ex.printStackTrace();}}}/*** 反射执行** @param obj* @param member* @param value*/public static void setter(Object obj, String member, Object value) {if (null == value)return;try {Method method = obj.getClass().getMethod(SET + updateFirst(member), value.getClass());method.invoke(obj, value);} catch (Exception e) {e.printStackTrace();}}/*** 首字符大写** @param member* @return*/public static String updateFirst(String member) {String first = member.substring(0, 1).toUpperCase();String suffex = member.substring(1, member.length());return new StringBuilder().append(first).append(suffex).toString();}}三、使用例如第一个数据获取到list数据//解析为responseResponse response = JsonResolveUtils.parseJsonToResponse(json,Response.class);从response里面获取list数据List<DiseaseList> list = new ArrayList<>();//获取完成开始解析为list beanResponse response = JsonResolveUtils.parseJsonToResponse(json,Response.class);ArrayList cache = null;cache = response.get(DA TA.DISEASELIST.toString());if(cache != ll && !cache.isEmpty()){//添加到listlist.addAll(cache);Log.e("tpnet",list.size()+"个数据");}else{//获取数据失败操作}四、使用注意解析的时候是根据返回的格式进行解析的，如果有数字类型的数据。