java map存储格式化_将java.util.Map转换为格式化json
import java.text.SimpleDateFormat;
import java.util.Map;
import java.util.Set;
public class ConvertMap2Json
{
private static final String QUOTE = “\“”;
/**
* 将Map转成一个json对象,即像大括号的东西
* e.g.
* {
* “eventName”: “name”
* }
*
* @param body
* @param tabCount
* @param addComma
* @return
*/
public static String buildJsonBody(Map body, int tabCount, boolean addComma)
{
StringBuilder sbJsonBody = new StringBuilder();
sbJsonBody.append(“{\n”);
Set keySet = body.keySet();
int count = 0;
int size = keySet.size();
for (String key : keySet)
{
count++;
sbJsonBody.append(buildJsonField(key, body.get(key), tabCount + 1, count != size));
}
sbJsonBody.append(getTab(tabCount));
sbJsonBody.append(“}“);
return sbJsonBody.toString();
}
/**
* 生成一个json字段即像这样的
* e.g.
* “eventName”: “aaa”
*
* @param key
* @param value
* @param tabCount
* @param addComma
* @return
*/
private static String buildJsonField(String key, Object value, int tabCount, boolean addComma)
{
StringBuilder sbJsonField = new StringBuilder();
sbJsonField.append(getTab(tabCount));
sbJsonField.append(QUOTE).append(key).append(QUOTE).append(“: “);
sbJsonField.append(buildJsonValue(value, tabCount, addComma));
return sbJsonField.toString();
}
/**
* 生成json值对象
* e.g.
* “string”
* 或
* {
* “key”: “value”
* }
*
* @param value
* @param tabCount
* @param addComma
* @return
*/
private static String buildJsonValue(Object value, int tabCount, boolean addComma)
{
StringBuilder sbJsonValue = new StringBuilder();
if (value instanceof String)
{
sbJsonValue.append(QUOTE).append(value).append(QUOTE);
}
else if (value instanceof Integer || value instanceof Long || value instanceof Double)
{
sbJsonValue.append(value);
}
else if (value instanceof java.util.Date)
{
sbJsonValue.append(QUOTE).append(formatDate((java.util.Date) value)).append(QUOTE);
}
else if (value.getClass().isArray() || value instanceof java.util.Collection)
{
sbJsonValue.append(buildJsonArray(value, tabCount, addComma));
}
else if (value instanceof java.util.Map)
{
sbJsonValue.append(buildJsonBody((java.util.Map) value, tabCount, addComma));
}
sbJsonValue.append(buildJsonTail(addComma));
return sbJsonValue.toString();
}
/**
* 生成json数组对象
* [
* “value”
* ]
* 或
* [
* {
* “key”: “value”
* }
* ]
*
* @param value
* @param tabCount
* @param addComma
* @return
*/
private static String buildJsonArray(Object value, int tabCount, boolean addComma)
{
StringBuilder sbJsonArray = new StringBuilder();
sbJsonArray.append(“[\n”);
Object[] objArray = null;
if (value.getClass().isArray())
{
objArray = (Object[]) value;
}
else if (value instanceof java.util.Collection)//将集合类改为对象数组
{
objArray = ((java.util.Collection) value).toArray();
}
int size = objArray.length;
int count = 0;
//循环数组里的每一个对象
for (Object obj : objArray)
{
//加上缩进，比上一行要多一个缩进
sbJsonArray.append(getTab(tabCount + 1));
//加上对象值，比如一个字符串”String”，或者一个对象
sbJsonArray.append(buildJsonValue(obj, tabCount + 1, ++count != size));
}
sbJsonArray.append(getTab(tabCount));
sbJsonArray.append(“]“);
return sbJsonArray.toString();
}
/**
* 加上缩进，即几个\t
* TODO.
*
* @param count
* @return
*/
private static String getTab(int count)
{
StringBuilder sbTab = new StringBuilder();
while (count— > 0)
{
sbTab.append(“\t”);
}
return sbTab.toString();
}
/**
* 加上逗号
* TODO.
*
* @param addComma
* @return
*/
private static String buildJsonTail(boolean addComma)
{
return addComma ? “,\n” : “\n”;
}
/**
* 格式化日期
* TODO.
*
* @param date
* @return
*/
private static String formatDate(java.util.Date date)
{
return new SimpleDateFormat(“yyyy-MM-dd HH
ss”).format(date);
}
}
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.junit.Test;
public class TestConvertMap2Json
{
@Test
public void test()
{
Map data = initData();
System.out.println(ConvertMap2Json.buildJsonBody(data, 0, false));
}
private static Map initData()
{
Map map = new HashMap();
map.put(“eventName”, “ApplicationDetailUpdateAfter”);
map.put(“source”, “11111-22222-33333”);
map.put(“age”, 123.333);
Map paramMap = new HashMap();
map.put(“parameters”, paramMap);
paramMap.put(“recordId”, “REC14-00000-00013”);
paramMap.put(“recordType”, “ggg-aaa-cc-dd”);
List countryList = new ArrayList();
map.put(“country”, countryList);
countryList.add(“China”);
countryList.add(“USA”);
List> mapList = new ArrayList>();
map.put(“mapList”, mapList);
Map tempMap = new HashMap();
tempMap.put(“name”, “zzz”);
tempMap.put(“nick”, “ttt”);
mapList.add(tempMap);
return map;
}
}
{
“mapList”: [
{
“nick”: “ttt”,
“name”: “zzz”
}
],
“source”: “11111-22222-33333”,
“age”: 123.333,
“eventName”: “ApplicationDetailUpdateAfter”,
“parameters”: {
“recordId”: “REC14-00000-00013”,
“recordType”: “ggg-aaa-cc-dd”
},
“country”: [
“China”,
“USA”
]
}
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分手后的思念是犯贱
港控/mmm°
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