Servlet Request Header Response Application simple case

Servlet Request Header Response Application simple case: Access Aservlet redirect to bservlet,5 seconds after jumping to cservlet and displaying the picture:

Aservlet

1  PackageCn.yzu;2 Importjava.io.IOException;3 Importjavax.servlet.ServletException;4 ImportJavax.servlet.http.HttpServlet;5 Importjavax.servlet.http.HttpServletRequest;6 ImportJavax.servlet.http.HttpServletResponse;7  Public classAservletextendsHttpServlet {8 9      Public voiddoget (httpservletrequest request, httpservletresponse response)Ten             throwsservletexception, IOException { OneSystem.out.println ("Aservlet is accessed to ... "); A         //REDIRECT request header, can be replaced by a response.sendredirect ("Bservlet"); -Response.setstatus (302); -Response.setheader ("Location", "Bservlet"); the          -         //Cancel Cache request header, 3 groups suitable for all browsers, available <meta> tags instead -Response.setheader ("Pragma", "No-cache"); -Response.setheader ("Cache-control", "No-cache"); +Response.setdateheader ("Expires", 1); -     } +}

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Bservlet

1  PackageCn.yzu;2 3 Importjava.io.IOException;4 5 Importjavax.servlet.ServletException;6 ImportJavax.servlet.http.HttpServlet;7 Importjavax.servlet.http.HttpServletRequest;8 ImportJavax.servlet.http.HttpServletResponse;9 Ten  Public classBservletextendsHttpServlet { One      Public voiddoget (httpservletrequest request, httpservletresponse response) A             throwsservletexception, IOException { -System.out.println ("Bservlet is accessed to ... "); -System.out.println ("Auto Jump to Cservlet after 3 seconds"); the         //Auto Refresh request Header -Response.setheader ("Refresh", "3; Url=cservlet "); -     } -}

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Cservlet

1  PackageCn.yzu;2 3 ImportJava.io.FileInputStream;4 Importjava.io.IOException;5 6 Importjavax.servlet.ServletException;7 ImportJavax.servlet.http.HttpServlet;8 Importjavax.servlet.http.HttpServletRequest;9 ImportJavax.servlet.http.HttpServletResponse;Ten  One Importorg.apache.commons.io.IOUtils; A  -  Public classCservletextendsHttpServlet { -      Public voiddoget (httpservletrequest request, httpservletresponse response) the             throwsservletexception, IOException { -System.out.println ("Cservlet is accessed to ... "); -         //Response Response Byte stream (universal, can also output characters) -FileInputStream stream=NewFileInputStream ("c:/users/administrator/desktop/ui/Avatar/lebron.jpeg"); +         //io gadget, provided by Apache, converts input flow into byte array -         bytebt[]=Ioutils.tobytearray (stream); +         //Note: It is absolutely not possible to use at the same time as response.getwriter (), otherwise it will throw IllegalStateException exception!!!!!!!  A Response.getoutputstream (). write (BT); at          -     } -  -}

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Operation Result:

Note: Io Gadget jar Package:

Servlet Request Header Response Application simple case