1、导对包包
这里是核心包 commons-fileupload-1.3.2.jar commons-io-2.4.jar commons-lang3-3.4.jar freemarker-2.3.23.jar javassist-3.20.0-GA.jar log4j-api-2.7.jar ognl-3.1.12.jar struts2-core-2.5.8.jar 这里是JSON依赖包，(ToT这里可坑哭我了，没导对一直报错...) commons-beanutils-1.9.2.jar commons-collections-3.2.1.jar commons-lang-2.4.jar ezmorph-1.0.6.jar json-lib-2.3-jdk15.jar struts2-json-plugin-2.5.10.jar2、struts2实现ajax、json重点在于struts.xml
1、<package>标签的写法： <package name="随意" namespace="/" extends="json-default"> //extends必须继承"json-default" </package> 2、<result>标签的写法： <result type="json">//type必须写json //不写<param>标签即该action下所有返回的变量 <param name="root">要改成json格式的变量</param> </result>3、其它就和常规一样…举个小栗子
JsonAction.java public class JsonAction extends ActionSupport{ private User user;//User类就name、age； private JSONArray jsonArray; @Override public String execute() throws Exception { System.out.println("测试数据"); List<User> list=new ArrayList<User>(); list.add(new User("小福",17)); list.add(new User("王优",52)); list.add(new User("布赫优",34)); jsonArray=JSONArray.fromObject(list); return SUCCESS; } public JSONArray getJsonArray() { return jsonArray; } public void setJsonArray(JSONArray jsonArray) { this.jsonArray = jsonArray; } public User getUser() { return user; } public void setUser(User user) { this.user = user; } } struts.xml <struts> <package name="ajax" namespace="/" extends="json-default"> <!-- <action name="ajax" class="com.action.AjaxAction"> </action> --> <action name="json" class="com.action.JsonAction" > <result type="json"> <param name="root">jsonArray</param> </result> </action> </package> </struts> JSON.jsp(用js写的显得很多，jq的话很方便，但是不会) <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script type="text/javascript"> window.onload=function(){ var bt=document.getElementById("bt"); bt.onclick=function(){ var xmlhttp=new XMLHttpRequest; xmlhttp.open("POST","json"); xmlhttp.setRequestHeader("Content-Type","application/x-www-form-urlencoded"); xmlhttp.send(); xmlhttp.onreadystatechange=function(){ if (xmlhttp.readyState==4) { if (xmlhttp.status==200) { var msg=document.getElementById("msg"); var redata=xmlhttp.responseText.toString(); var myjson=JSON.parse(redata); var text=""; for(var i=0;i<myjson.length;i++){ text+=myjson[i].name+":"; text+=myjson[i].age+", "; } msg.innerHTML=text; } } } } } </script> </head> <body> <button id="bt">点我获取JSON</button> <h1 id="msg"></h1> </body> </html> 效果图
