package my pack;
import java.io.*;
import javax.servlet.*;
public class QuestionServlet extends GenericServlet{
public void init(ServletConfig config) throws SercletExciption{
System.out.println("servlet is initialized");
} public void service(ServletRequset req,ServletResponse res)throws Exception{ ServletContext context = getServletContext();
PrintWriter out = res.getWriter();
out.println(context.getServletInfo());
out.close();
}}当浏览器端访问 QuestionServlet时为什么会出空指针错误啊?
import java.io.*;
import javax.servlet.*;
public class QuestionServlet extends GenericServlet{
public void init(ServletConfig config) throws SercletExciption{
System.out.println("servlet is initialized");
} public void service(ServletRequset req,ServletResponse res)throws Exception{ ServletContext context = getServletContext();
PrintWriter out = res.getWriter();
out.println(context.getServletInfo());
out.close();
}}当浏览器端访问 QuestionServlet时为什么会出空指针错误啊?
解决方案 »
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