dwr-Ajax开源框架

2025-01-12 技术教程

dwr全称Direct Web Remoting原理将java代码转化成js对象，实现跨域访问

web.xml

<?xmlversion="1.0"encoding="UTF-8"?><web-appxmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns="http://java.sun.com/xml/ns/javaee"xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"id="WebApp_ID"version="2.5"><display-name>DWR(DirectWebRemoting)</display-name><description>ASimpleDemoDWR</description><listener><listener-class>org.directwebremoting.servlet.DwrListener</listener-class></listener><servlet><servlet-name>dwr-invoker</servlet-name><servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class><init-param><param-name>debug</param-name><param-value>true</param-value></init-param><load-on-startup>1</load-on-startup></servlet><servlet-mapping><servlet-name>dwr-invoker</servlet-name><url-pattern>/dwr/*</url-pattern></servlet-mapping></web-app>

dwr.xml

<?xmlversion="1.0"encoding="UTF-8"?><!DOCTYPEdwrPUBLIC"-//GetAheadLimited//DTDDirectWebRemoting3.0//EN""http://getahead.org/dwr/dwr30.dtd"><dwr><allow><createcreator="new"><paramname="class"value="org.konghao.dwr.model.MyDwr"/></create><convertconverter="bean"match="org.konghao.dwr.model.User"/><convertconverter="bean"match="org.konghao.dwr.model.Group"/><convertmatch="java.lang.Exception"converter="exception"/><convertconverter="bean"match="java.lang.StackTraceElement"/></allow></dwr>

packageorg.konghao.dwr.model;importjava.io.File;importjava.io.IOException;importjava.io.InputStream;importjava.util.ArrayList;importjava.util.List;importjavax.servlet.http.HttpServletRequest;importorg.apache.commons.io.FileUtils;importorg.apache.commons.io.FilenameUtils;importorg.directwebremoting.WebContext;importorg.directwebremoting.WebContextFactory;publicclassMyDwr{publicStringhello(Stringworld){System.out.println("hello"+world);return"hello"+world;}publicUserload(){Useru=newUser(1,"张三",newGroup(1,"财务处"));returnu;}publicList<User>list(){List<User>users=newArrayList<User>();users.add(newUser(1,"张三",newGroup(1,"财务处")));users.add(newUser(2,"李四",newGroup(2,"科技处")));users.add(newUser(3,"王五",newGroup(3,"宣传部")));returnusers;}publicvoidadd(Useruser){System.out.println(user);}publicvoiddeleteUser(){thrownewMyException("在删除用户的时候有错");}publicintadd(inta,intb){returna+b;}publicStringupload(InputStreamis,Stringfilename)throwsIOException{//WebContext可以获取HttpServlet的对象WebContextwc=WebContextFactory.get();HttpServletRequestreq=wc.getHttpServletRequest();Stringrealpath=req.getSession().getServletContext().getRealPath("upload");Stringfn=FilenameUtils.getName(filename);Stringfilepath=realpath+"/"+fn;FileUtils.copyInputStreamToFile(is,newFile(filepath));returnfilepath;}}

packageorg.konghao.dwr.model;publicclassMyExceptionextendsRuntimeException{publicMyException(){super();//TODOAuto-generatedconstructorstub}publicMyException(Stringmessage,Throwablecause){super(message,cause);//TODOAuto-generatedconstructorstub}publicMyException(Stringmessage){super(message);//TODOAuto-generatedconstructorstub}publicMyException(Throwablecause){super(cause);//TODOAuto-generatedconstructorstub}}

packageorg.konghao.dwr.model;publicclassUser{privateintid;privateStringusername;privateGroupgroup;publicintgetId(){returnid;}publicvoidsetId(intid){this.id=id;}publicStringgetUsername(){returnusername;}publicvoidsetUsername(Stringusername){this.username=username;}publicGroupgetGroup(){returngroup;}publicvoidsetGroup(Groupgroup){this.group=group;}publicUser(intid,Stringusername,Groupgroup){super();this.id=id;this.username=username;this.group=group;}publicUser(){super();}@OverridepublicStringtoString(){return"User[id="+id+",username="+username+",group="+group+"]";}}

packageorg.konghao.dwr.model;publicclassGroup{privateintid;privateStringname;publicintgetId(){returnid;}publicvoidsetId(intid){this.id=id;}publicStringgetName(){returnname;}publicvoidsetName(Stringname){this.name=name;}publicGroup(intid,Stringname){super();this.id=id;this.name=name;}publicGroup(){super();}@OverridepublicStringtoString(){return"Group[id="+id+",name="+name+"]";}}

无刷新上传文件

<%@pagelanguage="java"contentType="text/html;charset=UTF-8"pageEncoding="UTF-8"%><!DOCTYPEhtmlPUBLIC"-//W3C//DTDHTML4.01Transitional//EN""http://www.w3.org/TR/html4/loose.dtd"><html><head><metahttp-equiv="Content-Type"content="text/html;charset=UTF-8"><title>Inserttitlehere</title><scripttype="text/javascript"src="<%=request.getContextPath()%>/dwr/engine.js"></script><scripttype="text/javascript"src="<%=request.getContextPath()%>/dwr/util.js"></script><scripttype="text/javascript"src="<%=request.getContextPath()%>/dwr/interface/MyDwr.js"></script><scripttype="text/javascript">functionupload(){varfile=dwr.util.getValue("myfile");alert(file.value);alert(file);MyDwr.upload(file,file.value,function(data){alert(data);});}</script></head><body><inputtype="file"id="myfile"/><inputtype="button"value="上传文件"onclick="upload()"/></body></html>