主要实现步骤如下: 1、JSP页面使用脚本代码执行ajax请求 2、Action中查询出需要返回的数据,并转换为json类型模式数据 3、配置struts.xml文件 4、页面脚本接受并处理数据
网上看到很多关于Struts2+ajax+jquery+json的例子,但是很多都不完整,也看不明白,主要原因是返回jsno类型数据和原来的返回字符串类型数据不一样,并且网友们实现步骤没有说清楚,让初学的朋友捉摸不透到底该怎么做。
我做了个简单的demo,供网友们学习,最后我会附上链接,可以下载整个demo.
首先需要的包(struts核心包和json需要的包):
struts核心包:
json需要的包:
commons-logging-*.jar在导入struts核心包的时候就导入了,所以导入json包的时候可以去掉这个包
页面效果:
json_demo.jsp页面(该页面引用了jquery文件,我用的版本是jquery-1.8.2.js,如果使用版本不同,请自行修改):
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<%@ page language="java" contentType="text/html; charset=UTF-8" |
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pageEncoding="UTF-8"%> |
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
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< meta http-equiv = "Content-Type" content = "text/html; charset=UTF-8" > |
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< title >Simpleton Demo | struts+ajax返回json类型数据</ title > |
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< link rel = "shortcut icon" type = "image/x-icon" href = "images/Icon.png" /> |
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< link rel = "stylesheet" type = "text/css" href = "styles/base.css" /> |
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< body background = "images/bg.gif" > |
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< form action = "#" method = "post" > |
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< label for = "name" >姓名:</ label >< input type = "text" name = "name" /> |
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< label for = "age" >年龄:</ label >< input type = "text" name = "age" /> |
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< label for = "position" >职务:</ label >< input type = "text" name = "position" /> |
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< input type = "button" class = "btn" value = "提交结果" /> |
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< li >姓名:< span id = "s_name" >赞无数据</ span ></ li > |
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< li class = "li_layout" >年龄:< span id = "s_age" >暂无数据</ span ></ li > |
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< li class = "li_layout" >职务:< span id = "s_position" >暂无数据</ span ></ li > |
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< div id = "authorgraph" >< img alt = "" src = "images/autograph.gif" ></ div > |
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< script type = "text/javascript" src = "scripts/jquery-1.8.2.js" ></ script > |
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< script type = "text/javascript" > |
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var $btn = $("input.btn");//获取按钮元素 |
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$btn.bind("click",function(){ |
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url:"excuteAjaxJsonAction",//需要用来处理ajax请求的action,excuteAjax为处理的方法名,JsonAction为action名 |
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name:$("input[name=name]").val(), |
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age:$("input[name=age]").val(), |
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position:$("input[name=position]").val()//这里不要加"," 不然会报错,而且根本不会提示错误地方 |
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dataType:"json",//设置需要返回的数据类型 |
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success:function(data){ |
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var d = eval("("+data+")");//将数据转换成json类型,可以把data用alert()输出出来看看到底是什么样的结构 |
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//得到的d是一个形如{"key":"value","key1":"value1"}的数据类型,然后取值出来 |
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$("#s_name").text(""+d.name+""); |
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$("#s_age").text(""+d.age+""); |
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$("#s_position").text(""+d.position+""); |
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$(document).ready(function(){ |
JsonAction.java代码
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package com.simpleton.demo.action; |
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import java.util.HashMap; |
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import javax.servlet.http.HttpServletRequest; |
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import net.sf.json.JSONObject; |
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import org.apache.struts2.interceptor.ServletRequestAware; |
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import com.opensymphony.xwork2.ActionSupport; |
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public class JsonAction extends ActionSupport implements ServletRequestAware{ |
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private static final long serialVersionUID = 1L; |
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private HttpServletRequest request; |
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private String result; |
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public void setServletRequest(HttpServletRequest arg0) { |
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public String getResult() { |
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public void setResult(String result) { |
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public String excuteAjax(){ |
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String name = request.getParameter( "name" ); |
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int age = Integer.parseInt(request.getParameter( "age" )); |
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String position = request.getParameter( "position" ); |
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//将数据存储在map里,再转换成json类型数据,也可以自己手动构造json类型数据 |
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Map<String,Object> map = new HashMap<String,Object>(); |
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map.put( "name" , name); |
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map.put( "position" , position); |
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JSONObject json = JSONObject.fromObject(map); //将map对象转换成json类型数据 |
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result = json.toString(); //给result赋值,传递给页面 |
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} catch (Exception e) { |
struts.xml中
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<? xml version = "1.0" encoding = "UTF-8" ?> |
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<!DOCTYPE struts PUBLIC |
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"-//Apache Software Foundation//DTD Struts Configuration 2.1.7//EN" |
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"http://struts.apache.org/dtds/struts-2.0.dtd"> |
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< constant name = "struts.i18n.encoding" value = "UTF-8" ></ constant > |
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< package name = "simpleton" extends = "struts-default,json-default" > |
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< action name = "*JsonAction" method = "{1}" class = "com.simpleton.demo.action.JsonAction" > |
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< result name = "fail" ></ result > |
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< param name = "root" >result <!-- result是action中设置的变量名,也是页面需要返回的数据,该变量必须有setter和getter方法 --> </ param > |
这样就可以完成一个简单json数据类型传递的demo了。
时间: 2024-10-23 13:40:44