myeclipse自带json包与json插件使用法.docVIP

为什么要用myeclipse自带的json包及json插件呢？一句话，方便，不用找struts2相匹配的json插件，这是优点，缺点是json新开发的功能没有。不过json原有的功能已经够使用了。 1、新建web project 2、添加struts2框架（add struts2 capabilities） 3、选择请求方式，/.* 4、查看项目文件夹下Struts2 Core Libraries文件夹下是否有json的jar包及json插件 5、创建action、dao、实体类（User），json使用实例 action类 代码 package woye.action;  import java.util.List; import javax.servlet.http.HttpSession; import org.apache.struts2.ServletActionContext; import woye.dao.bean.User; import woye.dao.impl.UserDaoImpl; import woye.exceptions.DaoException; import woye.exceptions.ParameterException; import woye.exceptions.ValidateException; import woye.util.MD5; import com.opensymphony.xwork2.ActionSupport;  public class UserAction extends ActionSupport { /** * */ //private static final long serialVersionUID = 1L;  private UserDaoImpl userDao = new UserDaoImpl(); public User user;  public User getUser() { return user; } public void setUser(User user) { this.user = user; } // 登录 public String login() throws DaoException, ValidateException, Exception {  if(user==null || user.equals()){ return ERROR; } if(user.getNickName()==null||user.getNickName().equals()){ return ERROR; } if(user.getPassWord()==null||user.getPassWord().equals()){ return ERROR; } user = userDao.userLogon(user.getNickName(), user.getPassWord()); System.out.println(user.toString()); if(user != null !user.equals()) { return SUCCESS; } return ERROR; } }   dao类 代码  package woye.dao.impl;  import java.util.List; import woye.dao.IUser; import woye.dao.base.BaseDAOImpl; import woye.dao.bean.User; import woye.exceptions.DaoException; import woye.exceptions.ParameterException; import woye.exceptions.ValidateException; import woye.util.MD5;  public class UserDaoImpl extends BaseDAOImpl { // 登录 public User userLogon(String userName, String userPwd) throws DaoException, ValidateException, Exception { StringBuffer strSql = new StringBuffer(); strSql.append(SELECT USERID AS userId,NICKNAME AS nickName,PASSWORD AS PassWord,TELEPHONE AS telephone,STATUS A