json(gson),struts,jquery实例

gson是json的一个非常方便的插件

jar包：

 

struts2的jar包：

commons-fileupload-1.2.1.jar

commons-io-1.3.2.jar

freemarker-2.3.16.jar

javassist-3.7.ga.jar

ognl-3.0.jar

struts2-core-2.2.1.jar

xwork-core-2.2.1.jar

json jar包:

commons-collections-3.2.jar.jar

commons-lang.jar

commons-beanutils.jar

commons-logging.jar

json-lib-2.2-jdk15.jar

ezmorph-1.0.5.jar

gson jar包:

gson-1.5.jar

 

index.jsp导入JQuery,

js代码:

<mce:script type="text/javascript" src="js/jquery-1.4.2.js" mce_src="js/jquery-1.4.2.js"></mce:script><mce:script type="text/javascript"><!--$(document).ready(function(){$("#btn").click(function(){$.ajax({type:"post",url:"registerAction",data:"username="+$("#username").val(),success:function(msg){$.each(msg,function(i,j){alert(i);alert(j.HomeAddress);})}})});})// --></mce:script> 

注意：msg是返回时的值 循环输出，i是key,j是value

 

jsp中写个button就行

<input type="button" id="btn" />

 

配置web.xml

<filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <welcome-file-list> <welcome-file>/register.jsp</welcome-file> </welcome-file-list> 

struts.xml

<action name="registerAction" class="com.struts.action.RegisterAction"></action> 

注意：这里不用返回，因为后台传的数据是out.prlnt();传的

 

Address类,用于存在在List或Map中

public class Address {private String HomeAddress;private String CompanyAddress;public String getHomeAddress() {return HomeAddress;}public void setHomeAddress(String homeAddress) {HomeAddress = homeAddress;}public String getCompanyAddress() {return CompanyAddress;}public void setCompanyAddress(String companyAddress) {CompanyAddress = companyAddress;} 

 

最后是action

import java.io.PrintWriter;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import javax.servlet.http.HttpServletResponse;import org.apache.struts2.ServletActionContext;import com.google.gson.Gson;import com.opensymphony.xwork2.ActionSupport;import com.struts.entity.Address;@SuppressWarnings("serial")public class RegisterAction extends ActionSupport{Map<String,Address> map;public Map<String, Address> getMap() {return map;}public void setMap(Map<String, Address> map) {this.map = map;}List<Address> list1;public List<Address> getList1() {return list1;}public void setList1(List<Address> list1) {this.list1 = list1;}public String execute() throws Exception {//地址1Address a1 = new Address();a1.setCompanyAddress("浙江");a1.setHomeAddress("杭州");//地址2Address a2 = new Address();a2.setCompanyAddress("江苏");a2.setHomeAddress("苏州");//使用Map时map = new HashMap<String,Address>();map.put("a", a1);map.put("b", a2);/*Gson gson = new Gson();String result = gson.toJson(map);*///使用List时list1= new ArrayList<Address>();list1.add(a1);list1.add(a2);Gson gson = new Gson();String result = gson.toJson(list1);System.out.println(result);HttpServletResponse response = ServletActionContext.getResponse();response.setContentType("text/json,charset=utf-8");response.setCharacterEncoding("utf-8");response.setHeader("Cache-Control", "no-cache");//清除缓存PrintWriter out = response.getWriter();out.println(result);out.flush();out.close();return null;} 

 

 

 

用Gson插件可以很好的使集合转为json类型的字符串，这样就实现了一个简单的异步操作。