Java Web keyword fill-in-the-blank example analysis

(1) In TestServletRequest, store the information named "param" and value "HelloWorld" into the request range, and use the request forwarding method to redirect to another Servlet--AnotherServlet. In AnotherServlet, read the value of param from the request scope. Please complete the following Servlet program.

文件名：TestServletRequest.java
@WebServlet("/TestServletRequest")
public class TestServletRequest extends HttpServlet {
 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException {
        request._____1_____("param","HelloWorld");
        RequestDispatcher rd=request.____2______("____3______");
        rd._____4_____(request,response);
 }
}
文件名：AnotherServlet.java
@WebServlet("/AnotherServlet")
public class AnotherServlet extends HttpServlet {
 public void doGet(HttpServletRequest request, HttpServletResponse response)
   throws ServletException, IOException { 
  String param= (String)request.____5______("param");
 }
}

1. setAttribute

2. getRequestDispatcher

3. /AnotherServlet

4. forward

5. getAttribute

(2) In the myweb application, a Servlet named HelloWorld is created, in which the request parameter values ​​are read and output. Please complete the following Servlet program.

public class HelloWorld extends ____1____ {
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
  //对用户提交的请求用utf-8来解码，否则会出现乱码
  request.____2____("utf-8");  
   //通过设置Content-Type（内容类型）,告诉浏览器接下来发送的是HTML,编码方式是UFT-8；
  response.____3____("text/html;charset=UTF-8");
     //获取请求对象中name参数对应的值
  String name = request.____4_____("name");
  String greeting = "Hello " + name + "!";
//获取输出流对象
  PrintWriter out = response.____5___();
  out.println(greeting);
 }
}

1. HttpServlet

2. setCharacterEncoding

3. setContentType

4. getParameter

5. getWriter

(3) In the myweb application, enter the user name and password on the form page, and use the "post" method to submit the form data to the Servlet program. The mapping url of the Servlet is configured as: /Process. Determine whether the entered user is "admin" in the Servlet. If so, redirect to another Servlet (Admin.java) whose mapping url is "/Admin".

Please complete the following Servlet program.

_____11_____//配置Servlet的mapping url
public class Process extends HttpServlet {
 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     //获取请求参数值
  String un = request._____2_____(“username”);
    if(un!=null ){
if(un._____3____(“admin”)){                            
response._____4_____(“____5_____”);  
     }
    }
   }
}

1. @WebServlet("/Precess")

2. getParameter

3. equals

4. sendRedirect

5. Admin

(4) In the myweb application, a Servlet is created named Servlet1, and its mapping url is: /Servlet1. Enter the address in the browser address bar to access the Servlet. Enter the address as follows:

http://localhost:8080/myweb/Servlet1?param1=111

Get the param1 parameter in this Servlet and pass it to another Servlet-Servlet2, and use forward request The method jumps to Servlet2.

Please complete the Servlet1 program below.

public class Servlet1 extends HttpServlet {
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     //获取名为param1的请求参数对应的值
     String param1= request.____1______("___2____");
     //保存到request范围中
     request._____3_____(“param1”,param1);
     //获取转发器对象
     RequestDispatcher rd=request._____4____("/Servlet2");
     //使用转发请求方式跳转到Servlet2
     rd.___5____(request,response);
 }
}

1. getParament

2. paraml

3. setAttribute

4. getRequestDispatcher

5. forward

(5) Filter

@WebFilter(
//仅对“/WebSite” URL格式进行过滤
        urlPatterns = { " ___1____" }, 
        initParams = { 
                @WebInitParam(name = "site", value = "dalian")
        })
public class MyFilter implements Filter {
    protected String site;      
    public void destroy() {
        
    }    
    public void ___2 ___ (ServletRequest req, ServletResponse res, FilterChain fchain) throws IOException, ServletException {
//如果site不为空，则输出site
        if(____ 3 _____) {
            System.out.println(“网站”+site);    
        }
        ___4___.doFilter(req, res);
    }
    public void init(FilterConfig conf) throws ServletException {
//获取@WebFilter注解中配置的初始化参数
    this.site= ___5___.getInitParameter("site");
    }
}

1. /Website

2. doFilter

3. site!=null

4. fchain

5. conf

(6) In the myweb application, a Servlet named Servlet1 is created. Servlet1 stores an attribute named "name" in the session scope, and then uses redirection to jump. Go to Servlet2. Get the "name" attribute value in the session scope in Servlet2 and output it. Please complete the Servlet2 program below.

public class Servlet2 extends HttpServlet {
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
     //获取当前会话对象
     HttpSession session=request._____1_____();
     //获取会话对象中的属性值
     String name= (String)session._____2_____("_____3_____");
     //获取输出流对象
     PrintWriter out=response._____4_____();
     //输出name
     out._____5_____(name);
 }
}

1. getSession;

2. getAttribute;

3. name;

4. getWriter;

##5. print

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