一个简单的javaBean+JSP+Servlet案例

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大体过程如下:

新建javaWab项目,写javaBean代码:

package com.helloworld.servletImple.model;public class HelloWorld {private String account;private String password;private String submitFlag; 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;} public String getSubmitFlag() {return submitFlag;} public void setSubmitFlag(String submitFlag) {this.submitFlag = submitFlag;}}

再写servlet控制层:

package com.helloworld.servletImple.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.helloworld.servletImple.model.HelloWorld; public class HelloServlet extends HttpServlet {public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{doPost(request, response);}public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{HelloWorld hw=(HelloWorld)request.getAttribute("helloModel");System.out.println("用戶輸入的參數為"+"hw");request.setAttribute("hw",hw);  request.getRequestDispatcher("/servletImple/welcome.jsp").forward(request,response);}    }

在web.xml进行对servlet进行配置:

  <servlet>  <servlet-name>hello</servlet-name>  <servlet-class>com.helloworld.servletImple.servlet.HelloServlet</servlet-class>  </servlet>  <servlet-mapping>  <servlet-name>hello</servlet-name>  <url-pattern>/hello</url-pattern>  </servlet-mapping>    <welcome-file-list>    <welcome-file>index.jsp</welcome-file>  </welcome-file-list></web-app>

最后写视图层,输出jsp页面:登录界面login.jsp和欢迎界面welcome.jsp

<body>  <jsp:useBean id="helloModel" class="com.helloworld.servletImple.model.HelloWorld" scope="request"></jsp:useBean>  <jsp:setProperty property="*" name="helloModel"/>  <%  if("login".equals(helloModel.getSubmitFlag())){  %>    <jsp:forward page="/hello"></jsp:forward>  <%  }  %>    <form action="/ss/servletImple/login.jsp" method="post">  <input type="hidden" name="submitFlag" value="login">  用戶名:<input type="text" name="account"><br>  密   碼:<input type="password" name="password"><br>  <input type="submit" value="提交">  </form>  </body>

welcome.jsp

<body>     <jsp:useBean id="hw" class="com.helloworld.servletImple.model.HelloWorld" scope="request">     </jsp:useBean>     歡迎 賬號為 <%=hw.getAccount() %> 盆友來訪.  </body>

整体的思路是:到登录界面输入用户名和密码,提交信息后向servlet发出登录请求,到web.xml中配置配对,到servlet程序中,再在servlet中完成转发到欢迎界面.

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