Struts2入门的第一个应用 - JAVA

今天开始学习struts2技术，现在struts2的技术已经超过了struts1,所以本人就没有学习struts1了，当然这个肯定不会影响我们后面的学习，先来看一下工程的目录结构：

说明:

queryAction.java就是struts2中的Action类:代码如下:

package com.struts.action;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.ServletActionContext;

import com.opensymphony.xwork2.ActionSupport;
import com.struts.bean.UserBean;
import com.struts.service.UserService;

public class queryAction extends ActionSupport {
private static final long serialVersionUID = 1L;
private UserBean userBean = new UserBean();
private String id;

public String getId(){
return id;
}

public void setId(String id){
this.id = id;
}

public UserBean getUserBean() {
return userBean;
}

public void setUserBean(UserBean userBean) {
this.userBean = userBean;
}

//struts2中继承ActionSupport类，重写execute方法，这里的返回值是一个字符串类型，具体的说明到后面再说:
public String execute() throws Exception {
try{
//将查询结果放到request域中
HttpServletRequest request = ServletActionContext.getRequest();
UserService userService = new UserService();
request.setAttribute("userBean", userService.queryUser(id));
//setUserBean(userDb.queryUser(id));//这行代码相当于上面的三行代码，因为struts2具有属性的注入功能
return "result";
}catch(Exception e){
return "error";
}
}

}

下面就是UserBean类：

package com.struts.bean;

public class UserBean {

private String id;
private String name;
private String birth;
private String age;
private String sex;

public UserBean(){
}

public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getBirth() {
return birth;
}
public void setBirth(String birth) {
this.birth = birth;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}

}

这个类没什么好说的了,

再来看一下数据库接口:UserDBImpl

package com.struts.db.impl;

import java.util.ArrayList;

import com.struts.bean.UserBean;

public interface UserDBImpl {

public void init();
public ArrayList getData();

}

然后看一下数据库接口的实现类:

package com.struts.db;

import java.util.ArrayList;

import com.struts.bean.UserBean;
import com.struts.db.impl.UserDBImpl;

public class UserDB implements UserDBImpl{

ArrayList userList = new ArrayList ();

public void init(){
for(int i=0;i<10;i++){
UserBean userBean = new UserBean();
userBean.setAge(i+"");
userBean.setBirth(i+"");
userBean.setId(i+"");
userBean.setName("jiangwei");
userBean.setSex("男");
userList.add(userBean);
}
}

public ArrayList getData(){
return userList;
}

}

这里就没有用数据库来访问数据了，我们是用一个list来模拟数据的

再来看一下业务层的接口:

package com.struts.service.impl;

import com.struts.bean.UserBean;

public interface UserServiceImpl {

public UserBean queryUser(String id);

}

业务层接口的实现类:

package com.struts.service;

import java.util.ArrayList;

import com.struts.bean.UserBean;
import com.struts.db.UserDB;
import com.struts.db.impl.UserDBImpl;
import com.struts.service.impl.UserServiceImpl;

public class UserService implements UserServiceImpl{

public UserBean queryUser(String id){

UserDBImpl userDb = new UserDB();
userDb.init();
ArrayList userList = userDb.getData();
if(userList == null){
return null;
}

if(id == null){
return null;
}
for(int i=0;i if(id.equals(userList.get(i).getId())){
return userList.get(i);
}
}
return null

Struts2入门的第一个应用(一)