package gemu.test.json;

 import java.io.File;

 import java.io.FileWriter;

 import java.io.IOException;

 import java.io.Writer;

 import net.sf.json.JSONArray;

 public class WritePrettyJSON {

     public static void main(String[] args) throws IOException {

         File file = new File("D:/json.json");

         String jsonStr = "[{a:1,b:{b1:[{a:2},{a:1}]},c:3},{a:1},{b:1}]";

 //        String jsonStr = "{a:1,b:{b1:[{a:2},{a:1}]},c:3,a:2,b:2}";

         JSONArray jsonObj = JSONArray.fromObject(jsonStr);

 //        JSONObject jsonObj = JSONObject.fromObject(jsonStr);

         char[] stack = new char[1024]; // 存放括号，如 "{","}","[","]"

         int top = -1;

         String string = jsonObj.toString();

         StringBuffer sb = new StringBuffer();

         char[] charArray = string.toCharArray();

         for (int i = 0; i < charArray.length; i++) {

             char c = charArray[i];

             if ('{' == c || '[' == c) {

                 stack[++top] = c; // 将括号添加到数组中，这个可以简单理解为栈的入栈

                 sb.append(charArray[i] + "\n");

                 for (int j = 0; j <= top; j++) {

                     sb.append("\t");

                 }

                 continue;

             }

             if ((i + 1) <= (charArray.length - 1)) {

                 char d = charArray[i+1];

                 if ('}' == d || ']' == d) {

                     top--; // 将数组的最后一个有效内容位置下标减 1，可以简单的理解为将栈顶数据弹出

                     sb.append(charArray[i] + "\n");

                     for (int j = 0; j <= top; j++) {

                         sb.append("\t");

                     }

                     continue;

                 }

             }

             if (',' == c) {

                 sb.append(charArray[i] + "\n");

                 for (int j = 0; j <= top; j++) {

                     sb.append("\t");

                 }

                 continue;

             }

             sb.append(c);

         }

         Writer write = new FileWriter(file);

         write.write(sb.toString());

         write.flush();

         write.close();

     }

 }