json 高手救命，Map转json，全部分了
Map<String,List> map=creditTranInfoBusiness.getCountByTime();
//map to array for josn
Map<String,CreditTranInfoWebBean[]> drawDataMap=new HashMap<String,CreditTranInfoWebBean[]>();
for(String str:map.keySet()){
CreditTranInfoWebBean[] arr=(CreditTranInfoWebBean[])map.get(str).toArray(new CreditTranInfoWebBean[0]);
drawDataMap.put(str, arr);
}
logger.info("******************"+drawDataMap);
String result ="";
try {
logger.info("***************before**************");
result = JsonUtil.map2Json(drawDataMap);
如果声明drawDataMap时不写Map<String,CreditTranInfoWebBean[]> drawDataMap运行时抛出 throw new RuntimeException("Unsupported type: " + o.getClass().getName());这个的异常，但写了的话，报错
注：map这传值是没问题的。里面的值类似[{"key":"2","value":[{"id":0,"number":0,"timeOver":1289232300109,"timeStart":1289232000109,"tranCode":"2","tranCodeName":"信用卡"},{"id":0,"number":0,"timeOver":1289232600109,"timeStart":1289232300109,"tranCode":"2","tranCodeName":"信用卡"},{"id":0,"number":0,"timeOver":1289283000109,"timeStart":1289282700109,"tranCode":"2","tranCodeName":"信用卡"}]},{"key":"1","value":[]}]}
JsonUtil.Java
package com.yucheng.ecmp.ecmp4credit.web;
import java.util.Map;
import java.util.Set;
/**
* Util for converting Java object to JSON string.
*
* @author Xuefeng
*/
public final class JsonUtil {
/**
* Convert a Java object to JSON string.
*/
@SuppressWarnings("unchecked")
public static String toJson(Object o) {
if (o==null)
return "null";
if (o instanceof String)
return string2Json((String)o);
if (o instanceof Boolean)
return boolean2Json((Boolean)o);
if (o instanceof Number)
return number2Json((Number)o);
if (o instanceof Map)
return map2Json((Map<String, Object>)o);
if (o instanceof Object[])
return array2Json((Object[])o);
if (o instanceof int[])
return intArray2Json((int[])o);
if (o instanceof boolean[])
return booleanArray2Json((boolean[])o);
if (o instanceof long[])
return longArray2Json((long[])o);
if (o instanceof float[])
return floatArray2Json((float[])o);
if (o instanceof double[])
return doubleArray2Json((double[])o);
if (o instanceof short[])
return shortArray2Json((short[])o);
if (o instanceof byte[])
return byteArray2Json((byte[])o);
throw new RuntimeException("Unsupported type: " + o.getClass().getName());
}
static String array2Json(Object[] array) {
if (array.length==0)
return "[]";
StringBuilder sb = new StringBuilder(array.length << 4);
sb.append('[');
for (Object o : array) {
sb.append(toJson(o));
sb.append(',');
}
// set last ',' to ']':
sb.setCharAt(sb.length()-1, ']');
return sb.toString();
}
static String intArray2Json(int[] array) {
if (array.length==0)
return "[]";
StringBuilder sb = new StringBuilder(array.length << 4);
sb.append('[');
for (int o : array) {
sb.append(Integer.toString(o));
sb.append(',');
}
// set last ',' to ']':
sb.setCharAt(sb.length()-1, ']');
return sb.toString();
}
static String longArray2Json(long[] array) {
if (array.length==0)
return "[]";
StringBuilder sb = new StringBuilder(array.length << 4);
sb.append('[');
for (long o : array) {
sb.append(Long.toString(o));
sb.append(',');
}
// set last ',' to ']':
sb.setCharAt(sb.length()-1, ']');
return sb.toString();
}
static String booleanArray2Json(boolean[] array) {
if (array.length==0)
return "[]";
StringBuilder sb = new StringBuilder(array.length << 4);
sb.append('[');
for (boolean o : array) {
sb.append(Boolean.toString(o));
sb.append(',');
}
// set last ',' to ']':
sb.setCharAt(sb.length()-1, ']');
return sb.toString();
}
static String floatArray2Json(float[] array) {
if (array.length==0)
return "[]";
StringBuilder sb = new StringBuilder(array.length << 4);
sb.append('[');
for (float o : array) {
sb.append(Float.toString(o));
sb.append(',');
}
// set last ',' to ']':
sb.setCharAt(sb.length()-1, ']');
return sb.toString();
}
static String doubleArray2Json(double[] array) {
if (array.length==0)
return "[]";
StringBuilder sb = new StringBuilder(array.length << 4);
sb.append('[');
for (double o : array) {
sb.append(Double.toString(o));
sb.append(',');
}
// set last ',' to ']':
sb.setCharAt(sb.length()-1, ']');
return sb.toString();
}
static String shortArray2Json(short[] array) {
if (array.length==0)
return "[]";
StringBuilder sb = new StringBuilder(array.length << 4);
sb.append('[');
for (short o : array) {
sb.append(Short.toString(o));
sb.append(',');
}
// set last ',' to ']':
sb.setCharAt(sb.length()-1, ']');
return sb.toString();
}
static String byteArray2Json(byte[] array) {
if (array.length==0)
return "[]";
StringBuilder sb = new StringBuilder(array.length << 4);
sb.append('[');
for (byte o : array) {
sb.append(Byte.toString(o));
sb.append(',');
}
// set last ',' to ']':
sb.setCharAt(sb.length()-1, ']');
return sb.toString();
}
static String map2Json(Map<String, Object> map) {
if (map.isEmpty())
return "{}";
StringBuilder sb = new StringBuilder(map.size() << 4);
sb.append('{');
Set<String> keys = map.keySet();
for (String key : keys) {
Object value = map.get(key);
sb.append('\"');
sb.append(key);
sb.append('\"');
sb.append(':');
sb.append(toJson(value));
sb.append(',');
}
// set last ',' to '}':
sb.setCharAt(sb.length()-1, '}');
return sb.toString();
}
static String boolean2Json(Boolean bool) {
return bool.toString();
}
static String number2Json(Number number) {
return number.toString();
}
static String string2Json(String s) {
StringBuilder sb = new StringBuilder(s.length()+20);
sb.append('\"');
for (int i=0; i<s.length(); i++) {
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();
}
}
[解决办法]
可能这个方法
static String map2Json(Map<String, Object> map)
要改成
static String map2Json(Map<String, Object[]> map)
因为你的map定义是数组。
