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 project2、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 AS status,logtime as logtime);strSql.append( FROM td_user);strSql.append( where nickName= + userName + );strSql.append( and passWord= + userPwd + );System.out.println(= + strSql);return (User) getObject(strSql, User.class);注：BaseDAOImpl 是一个父类 dao,完成了基本的增删改查的功能，另外此实例的 JDBC 使用了 DBUtils 框架,也就是 BaseDAOImpl 中各个功能都是由 DBUtils 完成的-实体类（user）-package woye.dao.bean;public class User / 用户编号private String userId;/ 昵称private String nickName;/ 密码private String passWord;/ 手机号private String telephone;/ 发布时间private String logtime;/ 状态private String status;public String getUserId() return userId;public void setUserId(String userId) this.userId = userId;public String getPassWord() return passWord;public void setPassWord(String passWord) this.passWord = passWord;public String getNickName() return nickName;public void setNickName(String nickName) this.nickName = nickName;public String getTelephone() return telephone;public void setTelephone(String telephone) this.telephone = telephone;public String getLogtime() return logtime;public void setLogtime(String logtime) this.logtime = logtime;public String getStatus() return status;public void setStatus(String status) this.status = status;Overridepublic String toString() return User logtime= + logtime + , nickName= + nickName+ , passWord= + passWord + , status= + status+ , telephone= + telephone + , userId= + userId + ;public User() super();public User(String passWord, String nickName, String telephone,String logtime, String status) super();this.nickName = nickName;this.passWord = passWord;this.telephone = telephone;this.logtime = logtime;this.status = status;注：user 用的上的属性就三个，id,name,password,其余的不要了，我懒了就没删，自己敲吧，要是复制就没有学习的意义了，这都省了好多。-6、struts.xml-