java将JSON字符串格式化到控制台的工具类

╰+哭是因爲堅強的太久メ 2022-05-20 03:04 169阅读 0赞

final class FormatUtil \{  
  
    /\*\*  
     \* 打印输入到控制台  
     \*  
     \* @param jsonStr  
     \* @author lizhgb  
     \* @Date 2015-10-14 下午1:17:22  
     \*/  
    public static void printJson(String jsonStr) \{  
        System.out.println(formatJson(jsonStr));  
    \}  
  
    /\*\*  
     \* 格式化  
     \* @param jsonStr  
     \* @return  
     \* @author lizhgb  
     \* @Date 2015-10-14 下午1:17:35  
     \* @Modified 2017-04-28 下午8:55:35  
     \*/  
    public static String formatJson(String jsonStr)  
    \{  
        if (null == jsonStr || "".equals(jsonStr))  
        \{  
            return "";  
        \}  
        StringBuilder sb = new StringBuilder();  
        char last = '\\0';  
        char current = '\\0';  
        int indent = 0;  
        boolean isInQuotationMarks = false;  
        for (int i = 0; i < jsonStr.length(); i++)  
        \{  
            last = current;  
            current = jsonStr.charAt(i);  
            switch (current)  
            \{  
                case '"':  
                    if (last != '\\\\')  
                    \{  
                        isInQuotationMarks = !isInQuotationMarks;  
                    \}  
                    sb.append(current);  
                    break;  
  
                case '\{':  
                case '\[':  
                    sb.append(current);  
                    if (!isInQuotationMarks)  
                    \{  
                        sb.append('\\n');  
                        indent++;  
                        addIndentBlank(sb, indent);  
                    \}  
                    break;  
  
                case '\}':  
                case '\]':  
                    if (!isInQuotationMarks)  
                    \{  
                        sb.append('\\n');  
                        indent--;  
                        addIndentBlank(sb, indent);  
                    \}  
                    sb.append(current);  
                    break;  
  
                case ',':  
                    sb.append(current);  
                    if (last != '\\\\' && !isInQuotationMarks)  
                    \{  
                        sb.append('\\n');  
                        addIndentBlank(sb, indent);  
                    \}  
                    break;  
  
                default:  
                    sb.append(current);  
            \}  
        \}  
  
        return sb.toString();  
    \}  
  
    /\*\*  
     \* 添加space  
     \*  
     \* @param sb  
     \* @param indent  
     \* @author lizhgb  
     \* @Date 2015-10-14 上午10:38:04  
     \*/  
    private static void addIndentBlank(StringBuilder sb, int indent)  
    \{  
        for (int i = 0; i < indent; i++)  
        \{  
            sb.append('\\t');  
        \}  
    \}  
\}