关于spring和extjs对接的过程简述

<?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">
    <welcome-file-list>
        <welcome-file>index.html</welcome-file>
    </welcome-file-list>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:applicationContext.xml</param-value>
    </context-param>
    <context-param>
        <param-name>resteasy.servlet.mapping.prefix</param-name>
        <param-value>/rest</param-value>
    </context-param>
    <context-param>
        <param-name>log4jConfigLocation</param-name>
        <param-value>classpath:log4j.properties</param-value>
    </context-param>

    <listener>
        <listener-class>org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap</listener-class>
    </listener>

      <listener>
        <listener-class>org.jboss.resteasy.plugins.spring.SpringContextLoaderListener</listener-class>
    </listener>

    <servlet>
        <servlet-name>RestEasy</servlet-name>
        <servlet-class>org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>RestEasy</servlet-name>
        <url-pattern>/rest/*</url-pattern>
    </servlet-mapping>

    <!-- 编码 -->
    <filter>
        <filter-name>encodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="
           http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
           http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd">

    <context:component-scan base-package="lmx.phone" />
</beans>

package lmx.phone.service;

import javax.ws.rs.GET;
import javax.ws.rs.Path;

import lmx.phone.util.ExtJSResponse;

import org.springframework.stereotype.Service;

@Service
@Path("esper")
public class EsperService {

    @Path("phone")
    @GET
    public ExtJSResponse phoneService() {
        System.out.println("rest works");
        return null;
    }

}

package lmx.phone.util;

import java.util.HashMap;

/**
 * used to integrates with ExtJS 4.x data stores.<br>
 * In ExtJS, the data store use following format to verify the result:
 * <p/>
 * <pre>
 *  "{"success":false,"data":"","message":"VERBOSE ERROR"}"
 * </pre>
 *
 * @author MiXian
 */
public class ExtJSResponse extends HashMap<String, Object> {
    /**
     *
     */
    private static final long serialVersionUID = -2791356338016228077L;

    public static ExtJSResponse successRes() {
        return new ExtJSResponse(true);
    }

    public static ExtJSResponse successRes4Find(Object data,Integer total) {
        ExtJSResponse res = new ExtJSResponse(true);
        res.setData(data);
        res.put("total",total);
        return res;
    }

    public static ExtJSResponse successResWithData(Object data) {
        ExtJSResponse res = new ExtJSResponse(true);
        res.setData(data);
        return res;
    }

    public static ExtJSResponse errorRes(String error) {
        ExtJSResponse res = new ExtJSResponse(false);
        res.setErrorMsg(error);
        return res;
    }

    public ExtJSResponse() {
    }

    public ExtJSResponse(boolean success) {
        super();
        setSuccess(success);
    }

    public boolean isSuccess() {
        return (Boolean) get("success");
    }

    public void setSuccess(boolean success) {
        put("success", success);
    }

    public void setErrorMsg(String errorMsg) {
        put("error", errorMsg);
    }

    public String getErrorMsg() {
        return (String) get("error");
    }

    public void setData(Object data) {
        put("data", data);
    }

    public Object getData() {
        return get("data");
    }

}

关于前台和后台之间的交互：

1、extjs发送ajax请求，以“/rest/*”的形式。

2、web.xml捕捉到请求之后，将请求发给DispatherServlet

3、DispatherServlet将请求发给配置的package

4、package扫描所有的“@service”类，寻找匹配的方法来处理请求，并返回给前端一个json数据串。json数据串通过ExtjsResonse来生成一个基本的内容。

5、前端根据json数据串来改变前端的内容