jquery_ajax_json简单实例

package com.iss.util; import java.lang.reflect.Array; import java.lang.reflect.Method; import java.util.Collection; import java.util.Iterator; import java.util.Map; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; import org.json.JSONString; /** * JSON工具类，反射的方式转换整个对象 * @author Jim Wu * */ public class JSONUtil{ private static JSONUtil instance = null; public JSONUtil(){} /** * 代理类时做的检查.返回应该检查的对象. * @param bean * @return */ protected Object proxyCheck(Object bean){ return bean; } static public String toJSONString(Object obj) throws JSONException{ return toJSONString(obj, false); } static public String toJSONString(Object obj, boolean useClassConvert) throws JSONException{ if(instance == null) instance = new JSONUtil(); return instance.getJSONObject(obj, useClassConvert).toString(); } private String getJSONArray(Object arrayObj, boolean useClassConvert) throws JSONException{ if(arrayObj == null) return "null"; arrayObj = proxyCheck(arrayObj); JSONArray jSONArray = new JSONArray(); if(arrayObj instanceof Collection){ Iterator iterator = ((Collection)arrayObj).iterator(); while(iterator.hasNext()){ Object rowObj = iterator.next(); if(rowObj == null) jSONArray.put(new JSONStringObject(null)); else if(rowObj.getClass().isArray() || rowObj instanceof Collection) jSONArray.put(getJSONArray(rowObj, useClassConvert)); else jSONArray.put(getJSONObject(rowObj, useClassConvert)); } } if(arrayObj.getClass().isArray()){ int arrayLength = Array.getLength(arrayObj); for(int i = 0; i < arrayLength; i ++){ Object rowObj = Array.get(arrayObj, i); if(rowObj == null) jSONArray.put(new JSONStringObject(null)); else if(rowObj.getClass().isArray() || rowObj instanceof Collection) jSONArray.put(getJSONArray(rowObj, useClassConvert)); else jSONArray.put(getJSONObject(rowObj, useClassConvert)); } } return jSONArray.toString(); } JSONStringObject getJSONObject(Object value, boolean useClassConvert) throws JSONException{ //处理原始类型 if (value == null) { return new JSONStringObject("null"); } value = proxyCheck(value); if (value instanceof JSONString) { Object o; try { o = ((JSONString)value).toJSONString(); } catch (Exception e) { throw new JSONException(e); } throw new JSONException("Bad value from toJSONString: " + o); } if (value instanceof Number){ return new JSONStringObject(JSONObject.numberToString((Number) value)); } if (value instanceof Boolean || value instanceof JSONObject || value instanceof JSONArray) { return new JSONStringObject(value.toString()); } if (value instanceof String) return new JSONStringObject(JSONObject.quote(value.toString())); if (value instanceof Map) { JSONObject jSONObject = new JSONObject(); Iterator iterator = ((Map)value).keySet().iterator(); while(iterator.hasNext()){ String key = iterator.next().toString(); Object valueObj = ((Map)value).get(key); jSONObject.put(key, getJSONObject(valueObj, useClassConvert)); } return new JSONStringObject(jSONObject.toString()); } //class if(value instanceof Class) return new JSONStringObject(JSONObject.quote(((Class)value).getSimpleName())); //数组 if (value instanceof Collection || value.getClass().isArray()) { return new JSONStringObject(getJSONArray(proxyCheck(value), useClassConvert)); } return reflectObject(value, useClassConvert); }//value.equals(null) private JSONStringObject reflectObject(Object bean, boolean useClassConvert) { JSONObject jSONObject = new JSONObject(); Class<? extends Object> klass = bean.getClass(); Method[] methods = klass.getMethods(); for (int i = 0; i < methods.length; i += 1) { try { Method method = methods[i]; String name = method.getName(); String key = ""; if (name.startsWith("get")) { key = name.substring(3); } else if (name.startsWith("is")) { key = name.substring(2); } if (key.length() > 0 && Character.isUpperCase(key.charAt(0)) && method.getParameterTypes().length == 0) { if (key.length() == 1) { key = key.toLowerCase(); } else if (!Character.isUpperCase(key.charAt(1))) { key = key.substring(0, 1).toLowerCase() + key.substring(1); } Object elementObj = method.invoke(bean, null); if(!useClassConvert && elementObj instanceof Class) continue; jSONObject.put(key, getJSONObject(elementObj, useClassConvert)); } } catch (Exception e) { /* forget about it */ } } return new JSONStringObject(jSONObject.toString()); } }