hookString

console.log("加载脚本成功！");
Java.perform(function x() {
    //定位StringBuilder,StringBuffer类
    const stringbuilder = Java.use("java.lang.StringBuilder");
    const stringbuffer = Java.use("java.lang.StringBuffer");

    //定位方法
    const toString = "toString";


    // 使用log类和Exception类产生堆栈
    var jAndroidLog = Java.use("android.util.Log");
    var jException = Java.use("java.lang.Exception");

    stringbuilder[toString].implementation = function(){
        //执行原逻辑
        const result = this[toString]();
        // 打印返回的字符串内容
        console.log(result);

        // 只有长度大于30时，才打印堆栈
        if (result.length > 15) {
            // 抛出异常。打印堆栈
            console.log(jAndroidLog.getStackTraceString(jException.$new()));
        }

        //return出去
        return result;
    };

    stringbuffer[toString].implementation = function() {
        //执行原逻辑
        const result = this[toString]();
        // 打印返回的字符串内容
        console.log(result);
        // 只有长度大于30时，才打印堆栈
        if (result.length > 30) {
            // 抛出异常。打印堆栈
            console.log(jAndroidLog.getStackTraceString(jException.$new()));
        }
        //return出去
        return result;
    }

});