You need to write an example for your work to call Servlet and run it,
An index. jsp page, a getandpostexample servlet background, and a web. xml configuration file
Index. jsp page
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<% @ Page Language = "Java" Import = "Java. util. * "pageencoding =" gb2312 "%> <br/> <% request. setcharacterencoding ("gb2312"); %> <br/> <! Doctype HTML public "-// W3C // dtd xhtml 1.0 transitional // en" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <br/> <HTML xmlns = "http://www.w3.org/1999/xhtml"> <br/> <pead> <br/> <meta http-equiv = "Content-Type" content = "text/html; charset = gb2312 "/> <br/> <title> Ajax test </title> <br/> <MCE: script language =" JavaScript "> <! -- <Br/> var XMLHTTP; <br/> // create XMLHTTP <br/> function createxmlhttprequest () <br/>{< br/> If (window. activexobject) <br/>{< br/> XMLHTTP = new activexobject ("Microsoft. XMLHTTP "); <br/>}< br/> else if (window. XMLHttpRequest) <br/>{< br/> XMLHTTP = new XMLHttpRequest (); <br/>}</P> <p> // name data to be sent <br/> function createquerystring () <br/>{< br/> var firstname = document. getelementbyid ("firstname "). value; <Br/> var middlename = document. getelementbyid ("middlename "). value; <br/> var Birthday = document. getelementbyid ("Birthday "). value; </P> <p> var querystring = "firstname =" + firstname + "& middlename =" + middlename + "& Birthday =" + birthday; <br/> return querystring; <br/>}</P> <p> // send in get mode <br/> function dorequestusingget () <br/>{< br/> createxmlhttprequest (); <br/> var querystring = ". /getandpostexample? "; <Br/> querystring = querystring + createquerystring () +" & timestamp = "+ new date (). gettime (); <br/> XMLHTTP. onreadystatechange = handlestatechange; <br/> XMLHTTP. open ("get", querystring, true); <br/> XMLHTTP. send (null); <br/>}</P> <p> // send in post mode <br/> function dorequestusingpost () <br/>{< br/> createxmlhttprequest (); <br/> var url = ". /getandpostexample? Timestamp = "+ new date (). gettime (); <br/> var querystring = createquerystring (); <br/> XMLHTTP. open ("Post", URL, true); <br/> XMLHTTP. onreadystatechange = handlestatechange; <br/> XMLHTTP. setRequestHeader ("Content-Type", "application/X-WWW-form-urlencoded"); <br/> XMLHTTP. send (querystring); <br/>}</P> <p> function handlestatechange () <br/>{< br/> If (XMLHTTP. readystate = 4) <br/>{< br/> If (XMLHTTP. status = 200) <br/>{< br/> parseresults (); <br/>}</P> <p> // parse the return value <br/> function parseresults () <br/>{< br/> var responsediv = document. getelementbyid ("serverresponse"); <br/> If (responsediv. haschildnodes () <br/>{< br/> responsediv. removechild (responsediv. childnodes [0]); <br/>}< br/> var responsetext = document. createtextnode (XMLHTTP. responsetext); <br/> alert ("returned value in the background:" + XMLHTTP. responsetext); <br/> responsediv. appendchild (responsetext); <br/>}< br/> // --> </MCE: SCRIPT> <br/> </pead> </P> <p> <body> <br/> <Form ID = "form1" name = "form1" method = "Post "Action =" # "> <br/> <p> <br/> Name: <input name = "firstname" type = "text" id = "firstname"/> <br/> </P> <br/> <p> <br/> <label> <br/> Name: <input type = "text" name = "middlename" id = "middlename"/> <br/> </label> <br/> </P> <br/> <p> <br/> birthday: <input name = "Birthday" type = "text" id = "Birthday"/> <br/> </P> <br/> <p> </P> <br /> <p> <br/> <input type = "button" name = "Submit" value = "get" onclick = "dorequestusingget (); "/> <br/> <input type =" button "name =" submit2 "value =" Post "onclick =" dorequestusingpost (); "/> <br/> </P> <p> <Div id =" serverresponse "> </div> <br/> </form> </ p> <p> </body> <br/> </ptml> </P> <p>
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Getandpostexample
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Package temp; </P> <p> Import Java. io. ioexception; <br/> Import Java. io. printwriter; </P> <p> Import javax. servlet. servletexception; <br/> Import javax. servlet. HTTP. httpservlet; <br/> Import javax. servlet. HTTP. httpservletrequest; <br/> Import javax. servlet. HTTP. httpservletresponse; </P> <p> public class getandpostexample extends httpservlet {</P> <p>/** <br/> * constructor of the object. <br/> */<br/> Public getandpostexample () {<br/> super (); <br/>}</P> <p>/** <br/> * destruction of the servlet. <br> <br/> */<br/> Public void destroy () {<br/> super. destroy (); // just puts "Destroy" string in log <br/> // put your code here <br/>}</P> <p>/** <br/> * the doget method of the servlet. <br> <br/> * this method is called when a form has its tag Value Method equals to get. <br/> * @ Param request <br/> * The request send by the client to the server <br/> * @ Param response <br/> * the response send by the server to the client <br/> * @ throws servletexception <br/> * if an error occurred <br/> * @ throws ioexception <br/> * If an error occurred <br/> */<br/> Public void doget (httpservletrequest request, httpservletresponse response) <br/> throws servletexception, ioexception {</P> <p> dopost (request, response ); <br/>}</P> <p>/** <br/> * The dopost method of the servlet. <br> <br/> * this method is called when a form has its tag Value Method equals to <br/> * post. <br/> * @ Param request <br/> * The request send by the client to the server <br/> * @ Param response <br/> * the response send by the server to the client <br/> * @ throws servletexception <br/> * if an error occurred <br/> * @ throws ioexception <br/> * If an error occurred <br/> */<br/> Public void dopost (httpservletrequest request, httpservletresponse response) <br/> throws servletexception, ioexception {</P> <p> string data = ""; <br/> string temp = ""; </P> <p> temp = (string) request. getparameter ("firstname"); <br/> DATA = Data + "first name" + temp; <br/> temp = (string) request. getparameter ("middlename"); <br/> DATA = Data + "Intermediate name" + temp; <br/> temp = (string) request. getparameter ("Birthday"); <br/> DATA = Data + "Birthday" + temp; <br/> temp = (string) request. getparameter ("timestamp"); <br/> DATA = Data + "call time" + temp; </P> <p> system. out. println ("obtained data" + data); </P> <p> response. setcontenttype ("text/html; charset = gb2312"); </P> <p> printwriter out = response. getwriter (); </P> <p> out. println (data); <br/> out. flush (); <br/> out. close (); <br/>}</P> <p>/** <br/> * initialization of the servlet. <br> <br/> * @ throws servletexception <br/> * if an error occurs <br/> */<br/> Public void Init () throws servletexception {<br/> // put your code here <br/>}</P> <p >}< br/>
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Web. xml
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<? XML version = "1.0" encoding = "UTF-8"?> <Br/> <web-app version = "2.4" <br/> xmlns = "http://java.sun.com/xml/ns/j2ee" <br/> xmlns: xsi = "http://www.w3.org/2001/XMLSchema-instance" <br/> xsi: schemalocation = "http://java.sun.com/xml/ns/j2ee <br/> http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"> <br/> <servlet> <br/> <description> This is the description of my J2EE component </description> <br/> <display-Name> This is the display name of my J2EE component </display-Name> <br/> <servlet-Name> getandpostexample </servlet-Name> <br/> <servlet-class> temp. getandpostexample </servlet-class> <br/> </servlet> </P> <p> <servlet-mapping> <br/> <servlet-Name> getandpostexample </Servlet -Name> <br/> <URL-pattern>/getandpostexample </url-pattern> <br/> </servlet-mapping> <br/> <welcome-file-list> <br/> <welcome-File> index. JSP </welcome-File> <br/> </welcome-file-List> <br/> </Web-app> <br/>
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