最近要测试两款json解析器的性能, 需要生成不同结构的json, 上网看了下貌似没有, 就花半天撸了一个, 写个文章记录下.
代码在https://github.com/Mazexal/buildJson
核心代码:
private static String buildObjectBase(int length,int depthlevel){

    StringBuilder stringBuilder=new StringBuilder();
    stringBuilder.append("{");
    for(int i=0;i<length;i++){
        int num = getRandInt(5,20);
        stringBuilder.append("\"");
        stringBuilder.append(strBuild(num));
        stringBuilder.append("\"");
        num=getRandInt(5,20);
        stringBuilder.append(":");

        int choose=getRandInt(4,4);
        int tmp = getRandInt(3,4);
        if(depthlevel>5){
            choose=5;
        }
        switch (choose){
            case 0:
                depthlevel =depthlevel+1;
                stringBuilder.append(buildObjectBase(tmp,depthlevel+1));
                break;
            case 1:
                depthlevel =depthlevel+1;
                stringBuilder.append(buildArray(tmp,depthlevel+1));
                break;

            default:
                stringBuilder.append("\"");
                stringBuilder.append(strBuild(num));
                stringBuilder.append("\"");
                break;
        }
        if(i!=length-1){
            stringBuilder.append(",");
        }
    }
    stringBuilder.append("}");
    return (stringBuilder.toString());
}


private static String buildArray( int depth,int depthlevel){
    StringBuilder stringBuilder=new StringBuilder();
    stringBuilder.append("[");
    for(int i=0;i<depth;i++){
        int length =  getRandInt(5,12);
        stringBuilder.append(buildObjectBase(length,depthlevel+1));
        if(i!=depth-1){
            stringBuilder.append(",");
        }
    }
    stringBuilder.append("]");
    // stringBuilder.append(",");
    return stringBuilder.toString();
}

采用递归调用, 可以自由生成不同的结构.