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                        /JAVA遇见HTML——Servlet篇

为什么我这HTML中输出不了“用户名“和“密码”？

@WebServlet(name = "Servlet-init")
public class Servletinit extends HttpServlet {
private String username;
private String password;

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;
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
response.setContentType("text/html,charset=utf-8");
PrintWriter out = response.getWriter();
out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
out.println("<HTML>");
out.println(" <HEAD><TITLE>A Servlet</TITLE></HEAD>");
out.println(" <BODY>");
out.println("<h1>"+"用户名："+this.getUsername()+"</h1><br>");
out.println("<h1>"+"密码："+this.getPassword()+"</h1><br>");
out.println(" </BODY>");
out.println("</HTML>");
out.flush();
out.close();
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}

public void init() throws ServletException{
this.setUsername(this.getInitParameter("username"));
this.setPassword(this.getInitParameter("password"));
}
}

moummm

2017-09-02

源自：JAVA遇见HTML——Servlet篇 2-2

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4 回答

凌啊凌啊
2018-09-07

text/html;charset=utf-8

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ATMYBEST
2018-08-06

既用了注解@WebServlet(name = "Servlet-init")

又使用了web.xml配置，<servlet-name>ServletInit</servlet-name>

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moummm 提问者
2017-09-02

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
         version="3.1">
<servlet>
        <servlet-name>ServletInit</servlet-name>
        <servlet-class>com.servlet.Servletinit</servlet-class>
        <init-param>
            <param-name>username</param-name>
            <param-value>admin</param-value>
        </init-param>
        <init-param>
            <param-name>password</param-name>
            <param-value>admin</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>ServletInit</servlet-name>
        <url-pattern>/com/servlet/Servletinit</url-pattern>
    </servlet-mapping>
</web-app>

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