struts2的Action使用request、response等Servlet API_方法一

struts2的Action拋棄了request、response等Servlet API，使業務層更加獨立，但有時需要使用request、response，可以考慮使用ServletActionContext靜態方法(叫做非注射方式，非IoC方式)

package cn.test.struts2.action;
import java.io.File;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {
    private static final long serialVersionUID = 17863781QUI;
    // 帳號
    private String account;
    // 密碼
    private String password;
    // 主方法 如果用戶名密碼匹配 則返回成功頁面 否則返回登錄頁面
    public String execute() {
        if ("Apl@*987".equalsIgnoreCase(account) && "1234".equals(password)) {
            return SUCCESS;
        }
        return LOGIN;
    }

    public String login() {
        // 獲取 request、response
        HttpServletRequest request = ServletActionContext.getRequest();
        HttpServletResponse response = ServletActionContext.getResponse();

        // 將帳號放到 session 中
        HttpSession session = request.getSession(true);
        session.setAttribute("account", account);

        // 獲取web應用根目錄下 /upload 文件夾
        ServletContext context = ServletActionContext.getServletContext();
        File uploadFile = new File(context.getRealPath("upload"));

        return execute();
    }

    public String logout() {
        // 註銷代碼
        return "logout";
    }

    public String getAccount() {
        return account;
    }

    public void setAccount(String account) {
        this.account = account;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

maven中添加

<dependency>
    <groupId>org.apache.struts</groupId>
    <artifactId>struts2-core</artifactId>
    <version>2.5.16</version>
</dependency>

<dependency>
    <groupId>javax.servlet</groupId>
    <artifactId>servlet-api</artifactId>
    <version>2.5</version>
    <scope>provided</scope>
</dependency>