idea中无法解析request命令

class T2 implements Runnable {
            final String PATH=request.getParameter("HTPPSPacket1");
            public void run() {
                try {
                    Thread.sleep(5000);
                } catch (InterruptedException e1) {
                    e1.printStackTrace();

在IDEA中创建jsp文件，代码中第一句话中的request无法解析是什么原因

request属于servlet类库的方法，放在如下使用方法不对
class T2 implements Runnable {
final String PATH=request.getParameter("HTPPSPacket1");
public void run() {
try {
Thread.sleep(5000);
} catch (InterruptedException e1) {
e1.printStackTrace();