Custom PrintFormatting for GSON

问题

I'm having some trouble with GSON in regards to printing. GSON has two options when it comes to printing.

Pretty Printing
Compact Printing

I intend to use a modified form of Pretty Printing and even though the documentation says JsonPrintFormatter is the class which is used to modify the output format. I can't find that class in the GSON repository!

Any ideas on why this is the case or anyway I can modify the GSON printing? Apart from that, any libraries used to modify spacing or formatting of JSON in the Java language would also be helpful.

Pretty Print:

    {
  "classname": "something",
  "type": "object",
  "version": 1,
  "properties": [
    {
      "propertyname": "something1",
      "type": "String",
      "length": 255
    },
    {
      "propertyname": "something2",
      "type": "Date",
      "length": 10
    }
  ]
}

Compact Print:

{"classname":"something","type":"object","version":1,"properties":[{"propertyname":"something1","type":"String","length":255},{"propertyname":"something2","type":"Date","length":10}]}

My Print Style:

{
  "classname": "something",
  "type": "object",
  "version": 1,
  "properties": [
    {"propertyname": "something1","type": "String","length": 255},
    {"propertyname": "something2","type": "Date","length": 10}
  ]
}

回答1:

Well, it's just work in progress for now, but this should do the trick for strings with only one array. Will look into to making it more stable and able to handle more complex structures.

  private static String reformat(String og){
    String reformattable = og;
    String[] parts = reformattable.split("\\[",2);
    String arrayPart = parts[1];
    String arrayOnly = arrayPart.split("]",2)[0];
    reformattable = arrayOnly.replaceAll("\\{\n","{");
    reformattable = reformattable.replaceAll("\",\n", "\\\",");
    reformattable = reformattable.replaceAll(" +"," ");
    reformattable = reformattable.replaceAll("\\{ ","   {");
    reformattable = reformattable.replaceAll("\n }","}");

    return og.replace(arrayOnly,reformattable);
}

Result should look like this (at least for my simple class):

{
 "classname": "test",
 "properties": [
   {"propertyname": "1", "length": 1},
   {"propertyname": "1", "length": 1}
 ]
}

来源：https://stackoverflow.com/questions/54327375/custom-printformatting-for-gson

标签

java

gson