Java 格式化输出JSON字符串的2种实现操作
1使用阿里的FastJson
1.1项目的pom.xml依赖
com.alibaba fastjson 1.2.58
1.2Java示例代码
(1)导入的包:
com.alibaba.fastjson.JSON; importcom.alibaba.fastjson.JSONObject; importcom.alibaba.fastjson.serializer.SerializerFeature;
(2)测试代码:
其中JSON字符串为:
{"_index":"book_shop","_type":"it_book","_id":"1","_score":1.0,"_source":{"name":"Java编程思想（第4版）","author":"[美]BruceEckel","category":"编程语言","price":109.0,"publisher":"机械工业出版社","date":"2007-06-01","tags":["Java","编程语言"]}}
publicstaticvoidmain(String[]args){
StringjsonString="{\"_index\":\"book_shop\",\"_type\":\"it_book\",\"_id\":\"1\",\"_score\":1.0,"+
"\"_source\":{\"name\":\"Java编程思想（第4版）\",\"author\":\"[美]BruceEckel\",\"category\":\"编程语言\","+
"\"price\":109.0,\"publisher\":\"机械工业出版社\",\"date\":\"2007-06-01\",\"tags\":[\"Java\",\"编程语言\"]}}";
JSONObjectobject=JSONObject.parseObject(jsonString);
Stringpretty=JSON.toJSONString(object,SerializerFeature.PrettyFormat,SerializerFeature.WriteMapNullValue,
SerializerFeature.WriteDateUseDateFormat);
System.out.println(pretty);
}
(3)格式化输出后的结果:
说明:FastJson通过Tab键进行换行后的格式化.
{
"_index":"book_shop",
"_type":"it_book",
"_source":{
"date":"2007-06-01",
"author":"[美]BruceEckel",
"price":109.0,
"name":"Java编程思想（第4版）",
"publisher":"机械工业出版社",
"category":"编程语言",
"tags":[
"Java",
"编程语言"
]
},
"_id":"1",
"_score":1.0
}
2使用谷歌的Gson
2.1项目的pom.xml依赖
com.google.code.gson gson 2.2.4
2.2Java示例代码
(1)导入的包:
importcom.google.gson.Gson; importcom.google.gson.GsonBuilder; importcom.google.gson.JsonArray; importcom.google.gson.JsonElement; importcom.google.gson.JsonObject; importcom.google.gson.JsonParser;
(2)测试代码:
JSON字符串与上述测试代码相同.
publicstaticvoidmain(String[]args){
StringjsonString="{\"_index\":\"book_shop\",\"_type\":\"it_book\",\"_id\":\"1\",\"_score\":1.0,"+
"\"_source\":{\"name\":\"Java编程思想（第4版）\",\"author\":\"[美]BruceEckel\",\"category\":\"编程语言\","+
"\"price\":109.0,\"publisher\":\"机械工业出版社\",\"date\":\"2007-06-01\",\"tags\":[\"Java\",\"编程语言\"]}}";
Stringpretty=toPrettyFormat(jsonString)
System.out.println(pretty);
}
/**
*格式化输出JSON字符串
*@return格式化后的JSON字符串
*/
privatestaticStringtoPrettyFormat(Stringjson){
JsonParserjsonParser=newJsonParser();
JsonObjectjsonObject=jsonParser.parse(json).getAsJsonObject();
Gsongson=newGsonBuilder().setPrettyPrinting().create();
returngson.toJson(jsonObject);
}
(3)格式化输出后的结果:
说明:Gson使用2个空格作为换行后的格式转换.
{
"_index":"book_shop",
"_type":"it_book",
"_id":"1",
"_score":1.0,
"_source":{
"name":"Java编程思想（第4版）",
"author":"[美]BruceEckel",
"category":"编程语言",
"price":109.0,
"publisher":"机械工业出版社",
"date":"2007-06-01",
"tags":[
"Java",
"编程语言"
]
}
}
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