dwr-Ajax开源框架

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

<?xml version="1.0" encoding="UTF-8"?><web-app xmlns: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/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"    id="WebApp_ID" version="2.5"><display-name>DWR (Direct Web Remoting)</display-name>  <description>A Simple Demo DWR</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

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 3.0//EN" "http://getahead.org/dwr/dwr30.dtd"><dwr>  <allow>    <!--    <filter class="com.example.dwr.monitor.MonitoringAjaxFilter"/>    <filter class="org.directwebremoting.filter.ExtraLatencyAjaxFilter">      <param name="delay" value="200"/>    </filter>    -->    <!-- intro - for the test on index.html -->    <create creator="new">      <param name="class" value="org.konghao.dwr.model.MyDwr"/>    </create>    <convert converter="bean" match="org.konghao.dwr.model.User"/>    <convert converter="bean" match="org.konghao.dwr.model.Group"/>        <convert match="java.lang.Exception" converter="exception"/>    <convert converter="bean" match="java.lang.StackTraceElement"/>  </allow></dwr>

package org.konghao.dwr.model;import java.io.File;import java.io.IOException;import java.io.InputStream;import java.util.ArrayList;import java.util.List;import javax.servlet.http.HttpServletRequest;import org.apache.commons.io.FileUtils;import org.apache.commons.io.FilenameUtils;import org.directwebremoting.WebContext;import org.directwebremoting.WebContextFactory;public class MyDwr {    public String hello(String world) {        System.out.println("hello "+world);        return "hello "+world;    }        public User load() {        User u = new User(1,"张三",new Group(1,"财务处"));        return u;    }        public List<User> list() {        List<User> users = new ArrayList<User>();        users.add(new User(1,"张三",new Group(1,"财务处")));        users.add(new User(2,"李四",new Group(2,"科技处")));        users.add(new User(3,"王五",new Group(3,"宣传部")));        return users;    }        public void add(User user) {        System.out.println(user);    }    public void deleteUser() {        throw new MyException("在删除用户的时候有错");    }        public int add(int a,int b) {        return a+b;    }        public String upload(InputStream is,String filename) throws IOException {        //WebContext可以获取HttpServlet的对象        WebContext wc = WebContextFactory.get();        HttpServletRequest req = wc.getHttpServletRequest();        String realpath = req.getSession().getServletContext().getRealPath("upload");        String fn = FilenameUtils.getName(filename);        String filepath = realpath+"/"+fn;        FileUtils.copyInputStreamToFile(is, new File(filepath));        return filepath;    }}

package org.konghao.dwr.model;public class MyException extends RuntimeException {    public MyException() {        super();        // TODO Auto-generated constructor stub    }    public MyException(String message, Throwable cause) {        super(message, cause);        // TODO Auto-generated constructor stub    }    public MyException(String message) {        super(message);        // TODO Auto-generated constructor stub    }    public MyException(Throwable cause) {        super(cause);        // TODO Auto-generated constructor stub    }}

package org.konghao.dwr.model;public class User {    private int id;    private String username;    private Group group;    public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public Group getGroup() {        return group;    }    public void setGroup(Group group) {        this.group = group;    }    public User(int id, String username, Group group) {        super();        this.id = id;        this.username = username;        this.group = group;    }    public User() {        super();    }    @Override    public String toString() {        return "User [id=" + id + ", username=" + username + ", group=" + group                + "]";    }}

package org.konghao.dwr.model;public class Group {    private int id;    private String name;            public int getId() {        return id;    }    public void setId(int id) {        this.id = id;    }    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    public Group(int id, String name) {        super();        this.id = id;        this.name = name;    }    public Group() {        super();    }    @Override    public String toString() {        return "Group [id=" + id + ", name=" + name + "]";    }        }

无刷新上传文件

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title><script type="text/javascript" src=\'#\'" /dwr/engine.js"></script><script type="text/javascript" src=\'#\'" /dwr/util.js"></script><script type="text/javascript" src=\'#\'" /dwr/interface/MyDwr.js"></script><script type="text/javascript">function upload() {    var file = dwr.util.getValue("myfile");    alert(file.value);    alert(file);    MyDwr.upload(file,file.value,function(data){        alert(data);    });}</script></head><body>    <input type="file" id="myfile"/>        <input type="button" value="上传文件" onclick="upload()"/></body></html>

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