将JSON对象带有格式的写出到文件中

需求：将一个JSON对象写出到文件中，要求文件中的JSON数据带有简单的格式。代码的实现参考了Java算法中的栈处理括号匹配问题。好了，不多说了，下面是代码的实现。

代码:

 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();
     }
 }