ajax call in springmvc

Demo for use ajax in springmvc

 

setup the spring xml file:

<mvc:annotation-driven />
<!-- for use annotation-->
<context:component-scan base-package="com.test.controller"/>
<!-- for use common extends controller and annotation , will prompt "No adapter for handler" exception-->
<bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter"/>

<!-- register the JSON parser -->
<bean id="annotationMethodHandlerAdapter" class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
	<property name="messageConverters">
		<list>
			<bean class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter" />
		</list>
	</property>
</bean>

 prepare the controller:

package com.test.controller;

import java.util.HashMap;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import com.test.to.UserTO;

@Controller
public class JsonController{
	
	private static Logger logger = Logger.getLogger(JsonController.class);
	
//pass string from frontend
	@ResponseBody
	@RequestMapping(value = "/extendSession", method = RequestMethod.POST)
	public Map<String,Object> extendSession( 
			@RequestParam(value = "param1", required = true)Integer param1) {
		logger.info("extendSession....................param1="+param1);
		HashMap<String, Object> model = new HashMap<String, Object>();
		model.put("status", "OK");
		return model;
	}
	
//pass object from frontend
	@ResponseBody   
	@RequestMapping(value = "/extendSession111", method = RequestMethod.POST)     
    public Map<String, Object> extendSession111(@RequestBody UserTO user,HttpServletRequest request) {     
      logger.info("extendSession111....................user:" + user.getAge()+"--"+user.getName());
      HashMap<String, Object> map = new HashMap<String, Object>();
      map.put("status", "OK");  
      return map;  
	}  

}

 prepare the frontend javascripts:

function anotherAjaxCall(index){
	if(index == 1){
		var user={name:"USER NAME",age:26};//object
	        var param = JSON.stringify(user);//parse to JSON object
		$.ajax({
			type : "POST",
			contentType: "application/json; charset=utf-8",
			url : "${pageContext.request.contextPath}/extendSession111.do",
			data: param,
			dataType : "json",
			success : function(msg) {
				alert(msg.status);
			}
		});
	}else{
		$.ajax({
			type : "POST",
			url : "${pageContext.request.contextPath}/extendSession.do",
			data: "param1=12999",//simple data
			dataType : "json",
			success : function(msg) {
				alert(msg.status);
			}
		});
	}
}

 prepare the html:

<a href="javascript:void(0)" onclick="anotherAjaxCall(1);">ajax call pass ENTITY to controller</a><br/>
<a href="javascript:void(0)" onclick="anotherAjaxCall(2);">ajax call pass common STRING to controller</a><br/>