我对struts2还很陌生。我的 Web 应用程序中有几个 Servlet，我想更改它以便使用 Struts2 框架。我该如何做到这一点并在代码中保持相同的逻辑？我也在使用 Hibernate，并且还想将 Struts2 与 Hibernate 一起使用。
例如，我的 Web 应用程序中有这个 servlet:
package com.webapp.servlets;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.hibernate.Session;
import com.webapp.entity.UserEntity;
import com.webapp.util.HibernateUtil;
/**
* Servlet implementation class SignUpServlet
*/
@WebServlet("/SignUpServlet")
public class SignUpServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public SignUpServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doProcess(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doProcess(request, response);
}
protected void doProcess(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("in process");
String userName = request.getParameter("userName");
String password = request.getParameter("password");
String email = request.getParameter("email");
String firstName = request.getParameter("firstName");
String lastName = request.getParameter("lastName");
String contactNo = request.getParameter("contactNo");
String address = request.getParameter("address");
UserEntity userEntity = new UserEntity();
userEntity.setUserName(userName);
userEntity.setPassword(password);
userEntity.setEmail(email);
userEntity.setFirstName(firstName);
userEntity.setLastName(lastName);
userEntity.setAddress(address);
userEntity.setContactNo(contactNo);
Session session = HibernateUtil.getSessionFactory().getCurrentSession();
session.beginTransaction();
session.save(userEntity);
session.getTransaction().commit();
response.sendRedirect("jsp/login.jsp");
}
}
还有模型
package com.webapp.entity;
import java.io.Serializable;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.xml.bind.annotation.XmlRootElement;
@Entity
@Table(name = "Users")
public class UserEntity implements Serializable{
/**
*
*/
private static final long serialVersionUID = 1L;
@Id
@Basic(optional = false)
@GeneratedValue(strategy= GenerationType.IDENTITY)
@Column(name = "userId")
private Long userId ;
@Column(name = "userName")
private String userName;
@Column(name = "password")
private String password;
@Column(name = "roleId")
private Long roleId;
@Column(name = "email")
private String email;
@Column(name = "firstName")
private String firstName;
@Column(name = "lastName")
private String lastName;
@Column(name = "address")
private String address;
@Column(name = "contactNo")
private String contactNo;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getLastName() {
return lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getContactNo() {
return contactNo;
}
public void setContactNo(String contactNo) {
this.contactNo = contactNo;
}
public Long getUserId() {
return userId;
}
public void setUserId(Long userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Long getRoleId() {
return roleId;
}
public void setRoleId(Long roleId) {
this.roleId = roleId;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}
View 是 SignUp.jsp
<head>
</head>
<body>
<br></br>
<br></br>
<table width="" border="0" align="center" cellpadding="0"
cellspacing="0" class="maintable">
<tr>
<td valign="top" align="center" class="middlesection">
<table width="96%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>
</td>
</tr>
<tr>
<td>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td>
<table width="100%" border="0" cellspacing="0"
cellpadding="0">
<tr>
<td align="left" valign="middle">
<h1>
Sign Up
</h1>
</td>
<td align="right" valign="bottom">
<table width="0%" border="0" cellspacing="0"
cellpadding="0">
<tr>
<td align="center" style="color: #00FF00">
</td>
<td>
<a href="#" class="buttonash" onclick="resetForm();"><span>
reset </span> </a>
</td>
<td width="5"></td>
<td>
<a href="#" class="buttonash" onclick="submit()"><span>
SignUp </span> </a>
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td class="bottomboder">
<img src="/WebApp/images/ashish.gif" height="1" />
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td>
</td>
</tr>
<tr>
<td></td>
</tr>
<tr>
<td>
<div class="tab-content-out" style="clear: both">
<div id="tabs" class="tabs">
<div id="TabbedPanels1" class="TabbedPanels">
<div
style="background: url(/WebApp/images/tabhdbg.gif) top repeat-x #ffffff; height: 70px;"
class="TabbedPanelsTabGroup">
<div style="width: 1px; float: left;">
<img src="/WebApp/images/tabhdline.gif" />
</div>
<div class="navi"
style="padding-left: 7px; padding-top: 9px;">
<div style="color: #4B5974; font-size: 24px;"
align="center">
<b> SignUp Form</b>
</div>
</div>
<div style="width: 1px; float: right;">
<img src="images/tabhdline.gif" />
</div>
</div>
</div>
<div class="TabbedPanelsContentGroup">
<div class="TabbedPanelsContent">
<div style="border: 0;" class="tab-content">
<div class="entry-edit">
<div class="tebelhd" align="left">
General Information
</div>
<div class="fieldset" id="_generalbase_fieldset">
<div class="hor-scroll" align="left">
<table class="form-list" cellspacing="0" align="center">
<tbody>
<form method="get" id="addCustomer" name="addCustomer" action="/WebApp/SignUpServlet" >
<table>
<tr>
<td>
<label>First Name</label>
</td>
<td>
<input type="text" name="firstName" required size="51" class="required-entry required-entry input-text"/>
</td>
</tr>
<tr>
<td>
<label>Last Name</label>
</td>
<td>
<input type="text" name="lastName" size="51" class="required-entry required-entry input-text"/>
</td>
</tr>
<tr>
<td>
<label>Adddress</label>
</td>
<td>
<input type="text" name="address" size="51" class="required-entry required-entry input-text"/>
</td>
</tr>
<tr>
<td>
<label>Contact No.</label>
</td>
<td>
<input type="text" name="contactNo" size="51" class="required-entry required-entry input-text"/>
</td>
</tr>
<tr>
<td>
<label>Email</label>
</td>
<td>
<input type="text" name="email" size="51" class="required-entry required-entry input-text"/>
</td>
</tr>
<tr>
<td>
<label>UserName</label>
</td>
<td>
<input type="text" name="userName" size="51" class="required-entry required-entry input-text"/>
</td>
</tr>
<tr>
<td>
<label>Password</label>
</td>
<td>
<input type="password" name="password" size="51" class="required-entry required-entry input-text"/>
</td>
</tr>
</table>
</form>
</tbody>
</table>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</td>
</tr>
</table>
</td>
</tr>
</table>
</body>
</html>
最佳答案
简而言之:
- 不要一开始就随机编辑应用程序中的内容，这会导致痛苦的世界。
- Read a Tutorial ，至少获得有关工作流程的最小概念。
- 使用 Maven 和 Struts2 原型(prototype)之一(可能是 Blank Convention Archetype)创建一个示例 Struts2 项目；让它运行，然后尝试改变一些东西，至少花一些时间来了解基础知识。
- 针对每个疑问深入研究 Struts 文档，深入了解基础知识。永远记住，每个操作在被调用之前和之后都通过拦截器堆栈(可定制的拦截器列表，每个拦截器执行不同的业务)运行，并且操作是按用户每个请求创建的，因此是线程安全的，而拦截器不是线程安全的。
经过几天的乐趣后，您可以开始编辑自己的大项目。
在旧版本中，Struts2 将 Actions 映射到一个名为 struts.xml 的文件中，但使用 Convention 插件则无需这样做，Actions 将根据其方法名称进行映射(或使用 @Action 注释)。
然后
- 摆脱
doGet()和doPost()方法 - 将
doProcess()更改为newActionName()，这将成为操作的名称，或者放入@Action(value="newActionName")每个doProcess()方法 - 映射操作的结果(正常或redirectAction)，并删除对 servlet 内的
response对象的所有引用。
如果你的项目很大，你不了解Struts2，并且你会尝试在没有花几天时间学习的情况下开始这种转换，那么你会在以后损失更多的天数，并得到更糟糕的结果。
关于java - 如何从Servlet改为Struts2？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/22310687/