Struct2_使用Ajax调用Action方法并返回值

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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;
}
}

1. 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\repository\org\apache\struts\struts2-json-plugin\2.3.16.3\struts2-json-plugin-2.3.16.3.jar\struts-plugin.xml
2. 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
3. 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
4. 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）
   
5. 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>  

Struct2_使用Ajax调用Action方法并返回值

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原文地址：http://www.cnblogs.com/gossip/p/5193527.html