一、Login.jsp
1、<head>引入jquery：
<script type="text/javascript"
src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.7.1.js"></script> 2、界面控件：
用户名： <input type="text" id="userName">
<input type="button" id="btnAjax" value="Ajax调用" />
3、提交ajax请求
<script type="text/javascript">
$(function() {
$("#btnAjax").click(function() {
var userName = $("#userName").val().trim();
if (userName == '') {
alert("用户名不能为空");
return false;
}
//login1为Action类命名空间名称；AjaxExecute为Action方法名称
$.ajax({
type : "post",
url : '/login1/ajaxExecute',
data : {//设置数据源
userName : userName,
password : "我是密码"
},
dataType : "json",//设置需要返回的数据类型
success : function(d) {
alert(d.sayHi);
},
error : function(d) {
alert(d.responseText);
}
});
});
});
</script> 二、后台类：LoginActionNoNamespce
package action; import java.text.SimpleDateFormat; import java.util.Date; import java.util.HashMap; import java.util.Map; import org.apache.struts2.convention.annotation.Action; import org.apache.struts2.convention.annotation.Namespace; import org.apache.struts2.convention.annotation.ParentPackage; import org.apache.struts2.convention.annotation.Result; import org.apache.struts2.interceptor.validation.SkipValidation; import freemarker.template.SimpleDate; @ParentPackage("json-default") @Namespace("/login1") public class LoginActionNoNamespce extends SuperActionSupport { private static final long serialVersionUID = 1L; private Map<String, String> dataMap; //会把本类所有getter方法序列化成字符串返回给jsp页面 public Map<String, String> getDataMap() { return dataMap; } public void setDataMap(Map<String, String> dataMap) { this.dataMap = dataMap; } @SkipValidation @Action(value = "ajaxExecute", results = { @Result(type = "json", params = { "root", "dataMap" }) }) public String ajaxExecute() throws Exception { this.dataMap = new HashMap<String, String>(); // 参数名称必须和jsp的空间名称一一对应 String userName = request.getParameter("userName"); String password = request.getParameter("password"); dataMap.put("isSuccess", "true"); SimpleDateFormat now = new SimpleDateFormat("yyyy年MM月dd日 HH时mm分ss秒"); dataMap.put("sayHi", "Hi:" + userName + " 当前时间为：" + now.format(new Date()) + password); return SUCCESS; } }
三、注意事项
- 类注解：@ParentPackage("json-default")，比如为json-default，不能为struts-default
json-default是继承于structs-default的,见.m2 epositoryorgapachestrutsstruts2-json-plugin2.3.16.3struts2-json-plugin-2.3.16.3.jarstruts-plugin.xml - Action注解：@Action(value = "ajaxExecute", results = { @Result(type = "json", params = { "root", "dataMap" }) })，这里的type必须为json、root是固定值，去掉params节点会返回undefined
- 这里的dataMap定义为：private Map<String, String> dataMap;必须要添加getter、setter参数，否则返回null
- JSP页面（这里可以用命名空间，如
url : '/login1/ajaxExecute', @ParentPackage("json-default")这样设置就不会报错）
- maven管理，需要引用的库
<dependencies><dependency><groupId>org.apache.struts</groupId><artifactId>struts2-core</artifactId><version>2.3.16</version><exclusions><exclusion><groupId>org.javassist</groupId><artifactId>javassist</artifactId></exclusion></exclusions></dependency><dependency><groupId>javax.servlet</groupId><artifactId>javax.servlet-api</artifactId><version>3.1.0</version></dependency><dependency><groupId>org.apache.struts</groupId><artifactId>struts2-convention-plugin</artifactId><version>2.3.16.3</version></dependency><dependency><groupId>org.apache.struts</groupId><artifactId>struts2-json-plugin</artifactId><version>2.3.16.3</version></dependency><dependency><groupId>net.sf.json-lib</groupId><artifactId>json-lib</artifactId><version>2.4</version></dependency></dependencies>