package com.amssy.core.util;

import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.sql.Timestamp;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * 转化json数据*
 */
public class JsonUtil {
 
  /**
  *
  * @param mapObject map转化list
  * @return
  */
 public static List changeMapToJsonTypeString(Map mapObject){
  List<Map> thirdLt = new ArrayList<Map>();
  Iterator<Map.Entry> tt = mapObject.entrySet().iterator();
    while (tt.hasNext()) {
     Map testMap = new HashMap();
     Map.Entry entry = tt.next();
     testMap.put("name", entry.getKey());
     testMap.put("value", entry.getValue());
     thirdLt.add(testMap);
  }
  return thirdLt;
 }
 
 public static String toJson(final Object o) 
    { 
        if (o == null) 
        { 
            return "\"\""; 
        }
        if(o instanceof Date){
         return date2JSon(o);
        }
        if(o instanceof Timestamp){
         return timestamp2JSon(o);
        }
        if (o instanceof String ) //String 
        { 
            return string2Json((String) o); 
        }
        if( o instanceof Character){
         return string2Json( String.valueOf(o)); 
        }
        if (o instanceof Boolean) //Boolean 
        { 
            return boolean2Json((Boolean) o); 
        } 
        if (o instanceof BigDecimal) //Boolean 
        { 
         return bigDecimal2Json((BigDecimal) o); 
        } 
        if (o instanceof Number) //Number 
        { 
            return number2Json((Number) o); 
        } 
        if (o instanceof Map) //Map 
        { 
            return map2Json((Map<Object, Object>) o); 
        } 
        if (o instanceof Collection) //List  Set 
        { 
            return collection2Json((Collection) o); 
        } 
        if (o instanceof Object[]) //对象数组 
        { 
            return array2Json((Object[]) o); 
        } 
 
        if (o instanceof int[])//基本类型数组 
        { 
            return intArray2Json((int[]) o); 
        } 
        if (o instanceof boolean[])//基本类型数组 
        { 
            return booleanArray2Json((boolean[]) o); 
        } 
        if (o instanceof long[])//基本类型数组 
        { 
            return longArray2Json((long[]) o); 
        } 
        if (o instanceof float[])//基本类型数组 
        { 
            return floatArray2Json((float[]) o); 
        } 
        if (o instanceof double[])//基本类型数组 
        { 
            return doubleArray2Json((double[]) o); 
        } 
        if (o instanceof short[])//基本类型数组 
        { 
            return shortArray2Json((short[]) o); 
        } 
        if (o instanceof byte[])//基本类型数组 
        { 
            return byteArray2Json((byte[]) o); 
        } 
        if (o instanceof Object) //保底收尾对象 
        { 
            return object2Json(o); 
        } 
 
        throw new RuntimeException("不支持的类型: " + o.getClass().getName()); 
    } 
 
    private static String bigDecimal2Json(BigDecimal o) {
      o=o.setScale(2, BigDecimal.ROUND_HALF_UP);
      return "\""+String.valueOf(o)+"\""; 
 }
 private static String timestamp2JSon(Object o) {
     if(null==o){
   return "\"\"";
  }
  SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  return "\""+formatter.format(o)+"\"";
 }
 private static String date2JSon(Object o) {
  if(null==o){
   return "\"\"";
  }
  SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
  return "\""+formatter.format(o)+"\"";
 }
 /**
     * 将 String 对象编码为 JSON格式，只需处理好特殊字符
     * 
     * @param s
     *            String 对象
     * @return JSON格式
     */ 
    static String string2Json(final String s) 
    { 
        final StringBuilder sb = new StringBuilder(); 
        sb.append(‘\"‘); 
        for (int i = 0; i < s.length(); i++) 
        { 
            final char c = s.charAt(i); 
            switch (c) 
            { 
            case ‘\"‘: 
                sb.append("\\\""); 
                break; 
            case ‘\\‘: 
                sb.append("\\\\"); 
                break; 
            case ‘/‘: 
                sb.append("\\/"); 
                break; 
            case ‘\b‘: 
                sb.append("\\b"); 
                break; 
            case ‘\f‘: 
                sb.append("\\f"); 
                break; 
            case ‘\n‘: 
                sb.append("\\n"); 
                break; 
            case ‘\r‘: 
                sb.append("\\r"); 
                break; 
            case ‘\t‘: 
                sb.append("\\t"); 
                break; 
            default: 
                sb.append(c); 
            } 
        } 
        sb.append(‘\"‘); 
        return sb.toString(); 
    } 
 
    /**
     * 将 Number 表示为 JSON格式
     * 
     * @param number
     *            Number
     * @return JSON格式
     */ 
    static String number2Json(final Number number) 
    { 
        return "\""+number.toString()+"\""; 
    } 
 
    /**
     * 将 Boolean 表示为 JSON格式
     * 
     * @param bool
     *            Boolean
     * @return JSON格式
     */ 
    static String boolean2Json(final Boolean bool) 
    { 
        return "\""+bool.toString()+"\""; 
    } 
 
    /**
     * 将 Collection 编码为 JSON 格式 (List,Set)
     * 
     * @param c
     * @return
     */ 
    static String collection2Json(final Collection<Object> c) 
    { 
        final Object[] arrObj = c.toArray(); 
        return toJson(arrObj); 
    } 
 
    /**
     * 将 Map<String, Object> 编码为 JSON 格式
     * 
     * @param map
     * @return
     */ 
    static String map2Json(final Map<Object, Object> map) 
    { 
        if (map.isEmpty()) 
        { 
            return "{}"; 
        } 
        final StringBuilder sb = new StringBuilder();
        sb.append(‘{‘); 
        final Set<Object> keys = map.keySet(); 
        for (final Object key : keys) 
        { 
            final Object value = map.get(key); 
            sb.append(‘\"‘); 
            sb.append(String.valueOf(key).toUpperCase()); //不能包含特殊字符 
            sb.append(‘\"‘); 
            sb.append(‘:‘); 
            sb.append(toJson(value)); //循环引用的对象会引发无限递归 
            sb.append(‘,‘); 
        } 
        // 将最后的 ‘,‘ 变为 ‘}‘:  
        sb.setCharAt(sb.length() - 1, ‘}‘); 
        return sb.toString(); 
    } 
 
    /**
     * 将数组编码为 JSON 格式
     * 
     * @param array
     *            数组
     * @return JSON 格式
     */ 
    static String array2Json(final Object[] array) 
    { 
        if (array.length == 0) 
        { 
            return "[]"; 
        } 
        final StringBuilder sb = new StringBuilder();
        sb.append(‘[‘); 
        for (final Object o : array) 
        { 
            sb.append(toJson(o)); 
            sb.append(‘,‘); 
        } 
        // 将最后添加的 ‘,‘ 变为 ‘]‘:  
        sb.setCharAt(sb.length() - 1, ‘]‘); 
        return sb.toString(); 
    } 
 
    static String intArray2Json(final int[] array) 
    { 
        if (array.length == 0) 
        { 
            return "[]"; 
        } 
        final StringBuilder sb = new StringBuilder(); 
        sb.append(‘[‘); 
        for (final int o : array) 
        { 
            sb.append("\""+Integer.toString(o)+"\""); 
            sb.append(‘,‘); 
        } 
        // set last ‘,‘ to ‘]‘: 
        sb.setCharAt(sb.length() - 1, ‘]‘); 
        return sb.toString(); 
    } 
 
    static String longArray2Json(final long[] array) 
    { 
        if (array.length == 0) 
        { 
            return "[]"; 
        } 
        final StringBuilder sb = new StringBuilder(); 
        sb.append(‘[‘); 
        for (final long o : array) 
        { 
            sb.append("\""+Long.toString(o)+"\""); 
            sb.append(‘,‘); 
        } 
        // set last ‘,‘ to ‘]‘: 
        sb.setCharAt(sb.length() - 1, ‘]‘); 
        return sb.toString(); 
    } 
 
    static String booleanArray2Json(final boolean[] array) 
    { 
        if (array.length == 0) 
        { 
            return "[]"; 
        } 
        final StringBuilder sb = new StringBuilder(); 
        sb.append(‘[‘); 
        for (final boolean o : array) 
        { 
            sb.append("\""+Boolean.toString(o)+"\""); 
            sb.append(‘,‘); 
        } 
        // set last ‘,‘ to ‘]‘: 
        sb.setCharAt(sb.length() - 1, ‘]‘); 
        return sb.toString(); 
    } 
 
    static String floatArray2Json(final float[] array) 
    { 
        if (array.length == 0) 
        { 
            return "[]"; 
        } 
        final StringBuilder sb = new StringBuilder(); 
        sb.append(‘[‘); 
        for (final float o : array) 
        { 
            sb.append("\""+Float.toString(o)+"\""); 
            sb.append(‘,‘); 
        } 
        // set last ‘,‘ to ‘]‘: 
        sb.setCharAt(sb.length() - 1, ‘]‘); 
        return sb.toString(); 
    } 
 
    static String doubleArray2Json(final double[] array) 
    { 
        if (array.length == 0) 
        { 
            return "[]"; 
        } 
        final StringBuilder sb = new StringBuilder(); 
        sb.append(‘[‘); 
        for (final double o : array) 
        { 
            sb.append("\""+Double.toString(o)+"\""); 
            sb.append(‘,‘); 
        } 
        // set last ‘,‘ to ‘]‘: 
        sb.setCharAt(sb.length() - 1, ‘]‘); 
        return sb.toString(); 
    } 
 
    static String shortArray2Json(final short[] array) 
    { 
        if (array.length == 0) 
        { 
            return "[]"; 
        } 
        final StringBuilder sb = new StringBuilder(); 
        sb.append(‘[‘); 
        for (final short o : array) 
        { 
            sb.append("\""+Short.toString(o)+"\""); 
            sb.append(‘,‘); 
        } 
        // set last ‘,‘ to ‘]‘: 
        sb.setCharAt(sb.length() - 1, ‘]‘); 
        return sb.toString(); 
    } 
 
    static String byteArray2Json(final byte[] array) 
    { 
        if (array.length == 0) 
        { 
            return "[]"; 
        } 
        final StringBuilder sb = new StringBuilder(); 
        sb.append(‘[‘); 
        for (final byte o : array) 
        { 
            sb.append("\""+Byte.toString(o)+"\""); 
            sb.append(‘,‘); 
        } 
        // set last ‘,‘ to ‘]‘: 
        sb.setCharAt(sb.length() - 1, ‘]‘); 
        return sb.toString(); 
    } 
 
    public static String object2Json(final Object bean) 
    { 
        //数据检查 
        if (bean == null) 
        { 
            return "{}"; 
        } 
        final Method[] methods = bean.getClass().getMethods(); //方法数组 
        final StringBuilder sb = new StringBuilder(); 
        sb.append(‘{‘); 
 
        for (final Method method : methods) 
        { 
            try 
            { 
                final String name = method.getName(); 
                String key = ""; 
                if (name.startsWith("get")) 
                { 
                    key = name.substring(3); 
 
                    //防死循环 
                    final String[] arrs = 
                    { "Class" }; 
                    boolean bl = false; 
                    for (final String s : arrs) 
                    { 
                        if (s.equals(key)) 
                        { 
                            bl = true; 
                            continue; 
                        } 
                    } 
                    if (bl) 
                    { 
                        continue; //防死循环 
                    } 
                } 
                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); 
                    } 
                    final Object elementObj = method.invoke(bean); 
 
                    //System.out.println("###" + key + ":" + elementObj.toString()); 
 
                    sb.append(‘\"‘); 
                    sb.append(key.toUpperCase()); //不能包含特殊字符 
                    sb.append(‘\"‘); 
                    sb.append(‘:‘); 
                    sb.append(toJson(elementObj)); //循环引用的对象会引发无限递归 
                    sb.append(‘,‘); 
                } 
            } 
            catch (final Exception e) 
            { 
                //e.getMessage(); 
                throw new RuntimeException("在将bean封装成JSON格式时异常：" + e.getMessage(), e); 
            } 
        } 
        if (sb.length() == 1) 
        { 
            return bean.toString(); 
        } 
        else 
        { 
            sb.setCharAt(sb.length() - 1, ‘}‘); 
            return sb.toString(); 
        } 
    }  
}

JsonUtil转换成json格式,布布扣,bubuko.com

JsonUtil转换成json格式