jquery和ajax和springmvc

<script type="text/javascript" src="js/jquery-1.11.1.js"></script>

$.ajax()-->XMLHttpRequest

$.ajax({

url:xxx,type:post|get,data:提交的数据,async:true|false同步或异步处理,dataType:json|html|script预期服务器返回结果类型，success:成功回调函数,error:失败的回调函数,beforeSend:请求发送前回调函数,

});

$("#showBtn"),id选择器

$(".showBtn"),类选择器

$("a")，所有a标签

$("table tr") table下面的所有tr

<a href="#" id="showBtn">查看上证指数</a>

$("#showBtn").click(function(){});

var s_opt='<option value="'+id+'">'+name+'</option>';

var $opt=$(s_opt);//将字符串转换成jquery对象

//将option添加到select中

$("s1").append($opt);

省份:

<select id="s1"></select>

1.触发事件源，下拉选择框，$("#s1")

2.触发事件时机，onchange选项发生改变

3.执行什么样操作

//提取当前选中的option内容

//将内容显示到span中

$(function(){

　　$("#s1").change(function(){

　　　　//提取选中项

　　　　var value=$("#s1 option:selected").text();//var value=$("#s1").val();

　　　　//显示到span中

　　　　$("#name_span").html(value);

　　});

})

Servlet往前台传jsp：

Note note=new Note();

//note.setXXX();填很多例子

JSONObject json=JSONObject.fromObject(note);

String json_str=json.toString();

//将list转成json字符串

JSONArray jsonlist=JSONArray.fromObject(list);

response.setContentType("text/plain;charset=utf-8");

PrintWriter out=response.getWriter();

out.print(jsron_str);

out.flush();

out.close();

---

springmvc

--ioc,webmvc

--aplicationContext.xml

/ajax.do

-->DispatcherServlet

-->HandlerMapping

-->LoadNoteController

-->调用jackson.jar包将Controller返回结果转成json格式输出（以前是viewResolver转到jsp）

需要的jar包：

commons-logging-1.2.jar
jackson-annotations-2.2.1.jar
jackson-core-2.2.1.jar
jackson-databind-2.2.1.jar
spring-aop-4.0.2.RELEASE.jar
spring-beans-4.0.2.RELEASE.jar
spring-context-4.0.2.RELEASE.jar
spring-core-4.0.2.RELEASE.jar
spring-expression-4.0.2.RELEASE.jar
spring-web-4.0.2.RELEASE.jar
spring-webmvc-4.0.2.RELEASE.jar

web.xml:

<filter>

<filter-name>myfilter</filter-name>

<filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>

<init-param>

<param-name>encoding</param-name>

<param-value>UTF-8</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>myfilter</filter-name>

<url-pattern>*.do</url-pattern>

</filter-mapping>

<servlet>

<servlet-name>springmvc</servlet-name>

<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

<init-param>

<param-name>contextConfigLocation</param-name>

<param-value>classpath:applicationContext.xml</param-value>

</init-param>

<load-on-startup>1</load-on-startup>

</servlet>

<servlet-mapping>

<servlet-name>springmvc</servlet-name>

<url-pattern>*.do</url-pattern>

</servlet-mapping>

applicationContext.xml:

<?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:util="http://www.springframework.org/schema/util"

xmlns:p="http://www.springframework.org/schema/p"

xmlns:aop="http://www.springframework.org/schema/aop"

xmlns:context="http://www.springframework.org/schema/context"

xmlns:mvc="http://www.springframework.org/schema/mvc"

xsi:schemaLocation="

http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd

http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd

http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-4.0.xsd

http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd

http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

<!-- 配置handlermaping -->

<mvc:annotation-driven/>

<!-- 扫描controller -->

<context:component-scan base-package="org.alexhe"></context:component-scan>

</beans>

LoadNoteController.java:

package org.alexhe.controller;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import org.alexhe.entity.Note;

import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;

@Controller

public class LoadNoteController {

//调用Dao获取笔记数据，采用json返回

@RequestMapping("/ajax.do")

@ResponseBody//将返回结果调用jackson.jar包

public List<Note> execute(){

List<Note> list=new ArrayList<Note>();

Note note=new Note();

note.setId("01");

note.setName("springmvc");

Note note1=new Note();

note1.setId("02");

note1.setName("java");

list.add(note);

list.add(note1);

return list;

}

@RequestMapping("/ajax2.do")

@ResponseBody//将返回结果调用jackson.jar包

public Note load1(){

Note note=new Note();

note.setId("111");

note.setName("look");

return note;

}

@RequestMapping("/ajax3.do")

@ResponseBody//将返回结果调用jackson.jar包

public Map<String,Object> load2(){

Map<String,Object> map=new HashMap<String,Object>();

map.put("id", 1);

Note note =new Note();

note.setId("22");

note.setName("哈哈哈哈");

map.put("我是note", note);

return map;

}

}