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> <!-- <filterclass="com.example.dwr.monitor.MonitoringAjaxFilter"/> <filterclass="org.directwebremoting.filter.ExtraLatencyAjaxFilter"> <paramname="delay"value="200"/> </filter> --> <!--intro-forthetestonindex.html--> <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,"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();
}
@Override
publicStringtoString(){
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();
}
@Override
publicStringtoString(){
return"Group[id="+id+",name="+name+"]";
}
}
<%@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=\'#\'" /dwr/engine.js"></script> <scripttype="text/javascript"src=\'#\'" /dwr/util.js"></script> <scripttype="text/javascript"src=\'#\'" /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>
