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Java Web关键字填空示例详解

(1)在TestServletRequest中将名为[param],值为[HelloWorld]的信息存入request范围内,并利用请求转发方式转向另一个Servlet——AnotherServlet。在AnotherServlet中,从request范围内读取param的值。请将下面的Servlet程序补充完整。

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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)在myweb应用中,创建了Servlet名为HelloWorld,在其中读取请求参数值并输出,请将下面的Servlet程序补充完整。

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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)在myweb应用中,在表单页面输入用户名和密码,并使用[post]方式将表单数据提交到Servlet程序,Servlet的mapping url配置为:/Process。在Servlet中判断输入的用户是否为[admin],如果是,则重定向到另一个Servlet(Admin.java),其mapping url为[/Admin]。

请将下面的Servlet程序补充完整。

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_____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)在myweb应用中,创建了一个Servlet名为Servlet1,其mapping url为:/Servlet1,在浏览器地址栏输入地址访问该Servlet,输入地址如下:

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

在该Servlet中获取param1参数,并将其传递给另一个Servlet——Servlet2,并使用转发请求方式跳转到Servlet2。

请将下面的Servlet1程序补充完整。

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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)过滤器

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@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) 在myweb应用中,创建了Servlet名为Servlet1,Servlet1在会话范围内存放了一个名为[name]的属性,然后使用重定向方式跳转到Servlet2。在Servlet2中获取会话范围中的[name]属性值并输出。请将下面的Servlet2程序补充完整。

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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

总结

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原文链接:https://blog.csdn.net/rej177/article/details/124222183

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