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();
}
}
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