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] + "
");
                for (int j = 0; j <= top; j++) {
                    sb.append("	");
                }
                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] + "
");
                    for (int j = 0; j <= top; j++) {
                        sb.append("	");
                    }
                    continue;
                }
            }
            if (',' == c) {
                sb.append(charArray[i] + "
");
                for (int j = 0; j <= top; j++) {
                    sb.append("	");
                }
                continue;
            }
            sb.append(c);
        }
        
        Writer write = new FileWriter(file);
        write.write(sb.toString());
        write.flush();
        write.close();
    }
}