本文是Struts2的综合实例,主要包含以下功能
- 添加,删除,修改,查询用户
- 上传,下载图片
- 拦截器实现登陆功能
- 验证器检查输入
下载图片功能以前没有实现过,步骤如下
- 在类中增加两个属性
//文件下载
private InputStream inputStream;
private String imageFileName;
- 下载方法实现
public String download(){
path = ServletActionContext.getRequest().getParameter("path");
filename = ServletActionContext.getRequest().getParameter("filename");
String storePath = ServletActionContext.getServletContext().getRealPath("/files");
try {
inputStream = new FileInputStream(storePath+"\\"+path+"\\"+filename);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return SUCCESS;
}
配置struts.xml
<action name="download" class="cn.itcast.domain.User" method="download">
<interceptor-ref name="mydefaultstack"></interceptor-ref>
<result type="stream" name="success">
<param name="contentType">application/octet-stream</param>
<param name="inputStream">inputStream</param><!-- 输入是对应的动作类中的那个字段 -->
<param name="contentDisposition">attachment;filename=${filename}</param><!-- 要下载的文件名 -->
</result>
<result name="login">/login.jsp</result>
</action>
JSP页面实现
<c:url value="/user/download" var="url">
<c:param name="path" value="${user.path}"></c:param>
<c:param name="filename" value="${user.filename}"></c:param>
</c:url>
<a href="${url}">下载</a>
登陆验证功能
定义拦截器类
package cn.itcast.interceptor;
import javax.servlet.http.HttpSession;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.interceptor.Interceptor;
public class PermissionInterceptor implements Interceptor {
public void destroy() {
}
public void init() {
}
public String intercept(ActionInvocation invocation) throws Exception {
HttpSession session = ServletActionContext.getRequest().getSession();
Object obj = session.getAttribute("user");
if(obj==null){
return "login";
}else{
return invocation.invoke();
}
}
}
struts.xml中的配置
<package name="mydefault" extends="struts-default">
<interceptors>
<interceptor name="permissionInterceptor" class="cn.itcast.interceptor.PermissionInterceptor"></interceptor>
<interceptor-stack name="mydefaultstack">
<interceptor-ref name="defaultStack"></interceptor-ref>
<interceptor-ref name="permissionInterceptor"></interceptor-ref>
</interceptor-stack>
</interceptors>
</package>
在其他Action中使用拦截
<interceptor-ref name="mydefaultstack"></interceptor-ref>
条件查询实现
JSP页面
<td>
<s:form action="user_queryCondition" namespace="/user">
<s:textfield name="username" label="用户名"></s:textfield>
<s:select list="#{'0':'女','1':'男'}" label="性别" name="sex" headerKey="" headerValue="请选择"></s:select>
<s:select label="学历" name="education" list="#{'研究生':'研究生','本科':'本科','专科':'专科','高中':'高中'}" headerKey="" headerValue="请选择"></s:select>
<s:submit value="查询"></s:submit>
</s:form>
</td>
javabean方法实现
public String queryCondition(){
List<User> users =s.findUserByCondition(this);
ActionContext.getContext().put("users", users);// #users
return SUCCESS;
}
service层方法实现
public List<User> findUserByCondition(User user) {
boolean ok1 = true;
boolean ok2 = true;
boolean ok3 = true;
StringBuffer sb = new StringBuffer("where 1=1 ");
if(user.getUsername()!=null&&!user.getUsername().equals("")){
ok1 = false;
sb.append(" and username like '%"+user.getUsername()+"%' ");
}
if(user.getSex()!=null&&!user.getSex().equals("")){
ok2 = false;
sb.append(" and sex='"+user.getSex()+"'");
}
if(user.getEducation()!=null&&!user.getEducation().equals("")){
ok3 = false;
sb.append(" and education='"+user.getEducation()+"'");
}
boolean conditionOk = ok1&&ok2&&ok3;//如果为false,说明至少有一个查询条件
if(conditionOk){
// System.out.println("没有查询条件");
// return null;
return dao.findUsersByCondition(null);
}else{
// System.out.println("有查询条件");
// System.out.println(sb.toString());
// return null;
return dao.findUsersByCondition(sb.toString());
}
}
其他增删改查详细实例参见github源码
ssh/Struts2Crud at master · whuhan2013/ssh