java map存储格式化_将java.util.Map转换为格式化json

港控/mmm° 2022-11-03 05:23 284阅读 0赞

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:mm: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"

java map存储格式化_将java.util.Map转换为格式化json

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