java web -- 簡單部署一個程序

原創

2020-02-21 09:51

開發工具：IDEA
1. 創建一個java工程，選擇web application,如圖：

創建一個servlet類，命名爲HelloServlet如圖：
編寫類，如下：

package test;

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

/**
 * Created by AA on 2017/4/8.
 */
public class HelloServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws javax.servlet.ServletException, IOException {

        this.doGet(request,response);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws javax.servlet.ServletException, IOException {
        response.setCharacterEncoding("UTF-8");
        request.setCharacterEncoding("UTF-8");

        response.setContentType("text/html");//設置文檔類型
        PrintWriter out = response.getWriter();//獲取out對象
        //輸出到客戶端瀏覽器
        out.println("<!DOCTYPE HTML PUBIC \"-//W3C//DTD HTML 4.01 Transitional //EN\">");
        out.println("<HTML>");
        out.println("<meta http-equiv=\"content-type\" content=\"text/html; charset=UTF-8\">");
        out.println("<HEAD><TITLE>hello world</TITLE></HEAD>");
        out.println("<BODY>");

        String url = request.getRequestURI(); //獲取uri路徑
        out.println("<form action='" + url +"' method='post'>");
        out.println("請輸入你的名字：<input type='text' name='name' />");
        out.println("<input type='submit'/>");
        out.println("</form>");
        out.println("");

        String name = request.getParameter("name");
        if(name != null && name.trim().length()>0){
            out.println("你好，我是大東，<b>"+name+"</b>.歡迎來到java web世界");
        }
        out.println(" </BODY>");
        out.println("</HTML>");
        out.flush();
        out.close();//關閉out
    }
}

編寫web.xml,如下：

<servlet>
        <servlet-name>helloServlet</servlet-name>
        <servlet-class>test.HelloServlet</servlet-class>//映射的路徑
    </servlet>
    <servlet-mapping>
        <servlet-name>helloServlet</servlet-name>
        <url-pattern>/hello</url-pattern>//訪問的url
    </servlet-mapping>

部署到tomcat上
把工程下web的所有文件都複製到tomcat目錄下的webapps(web目錄名可以重新命名)，在web下的WEB-INF下創建一個classes目錄，把編譯好的servlet文件複製到該目錄下（連包名一起復制），如圖
啓動tomcat服務，在瀏覽器輸入：http://localhost:8080/web/hello，如果正常會輸出如下，否則文件導入不正確