[Struts2应用开发] JSON的应用

在日常的WEB应用开发过程中，前端常会涉及AJAX，而前台与后台的交互常用的数据格式就是JSON。

Struts2中使用JSON的方法方法如下：

Action:

如果action中的某些属性不需要在json里面出现，可以通过annotation ：@JSON(serialize=false)来标记改属性不需返回至JSON。

注意，如果某属性没有get方法，则该属性亦不会在返回JSON串里面出现。

import java.util.List;import org.apache.struts2.json.annotations.JSON;
import com.opensymphony.xwork2.Action;public class UsersAction extends BaseAction implements Action {private String userID;private String userName;private String userPwd;private String employeeName;private String userIDs;private UsersService usersService;private String queryString;private List<LS_PT_MST_USERS> userList;@JSON(serialize=false)public List<LS_PT_MST_USERS> getUserList() {return userList;}public void setUserList(List<LS_PT_MST_USERS> userList) {this.userList = userList;}public String getUserID() {return userID;}public void setUserID(String userID) {this.userID = userID;}public String getUserName() {return userName;}public void setUserName(String userName) {this.userName = userName;}public String getUserPwd() {return userPwd;}public void setUserPwd(String userPwd) {this.userPwd = userPwd;}public String getEmployeeName() {return employeeName;}public void setEmployeeName(String employeeName) {this.employeeName = employeeName;}public String getUserIDs() {return userIDs;}public void setUserIDs(String userIDs) {this.userIDs = userIDs;}@JSON(serialize=false)public UsersService getUsersService() {return usersService;}public void setUsersService(UsersService usersService) {this.usersService = usersService;}public String getQueryString() {return queryString;}public void setQueryString(String queryString) {this.queryString = queryString;}public String editUsers(){LS_PT_MST_USERS entity = usersService.get(Integer.parseInt(this.userID));this.userName = entity.getUSERNAME();this.userPwd = entity.getUSERPWD();this.employeeName = entity.getEMPLOYEENAME();return SUCCESS;}    @Overridepublic String execute() throws Exception {// TODO Auto-generated method stubreturn null;}}

struts.xml

在配置文件中，package必须继承json-default。在需要返回json的action定义中，result type=json。

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN""http://struts.apache.org/dtds/struts-2.0.dtd">
<struts><package name="ptsystem" extends="json-default"><!-- ================== --><!--    配置菜单Action   --><!-- ================== --><!-- 添加 --><action name="add*" class="{1}Action" method="add{1}"><result name="success" type="redirectAction">show{1}</result></action><!-- 修改跳转 --><action name="edit*" class="{1}Action" method="edit{1}"><result type="json"></result></action><!-- 更新 --><action name="update*" class="{1}Action" method="update{1}"><result name="success" type="chain">show{1}</result></action><!-- 删除 --><action name="delete*" class="{1}Action" method="delete{1}"><result name="success" type="chain">show{1}</result></action><!-- 列出所有 --><action name="show*" class="{1}Action" method="show{1}"><result name="success">/setting/{1}List.jsp</result></action><!-- 搜索 --><action name="query*" class="{1}Action" method="query{1}"><result name="success">/setting/{1}List.jsp</result></action></package><!-- 上传附件定义 --><constant name="struts.multipart.parser" value="jakarta">constant</constant><constant name="struts.i18n.encoding" value="gbk" />
</struts>