week5 练习3

最新推荐文章于 2025-07-29 12:15:13 发布

MHNY.

最新推荐文章于 2025-07-29 12:15:13 发布

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文章标签： servlet java 前端

本文链接：https://blog.youkuaiyun.com/Ppsychee/article/details/129783840

servlet配置

1.使用注解配置，该方法较简单

2.使用web.xml进行配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:web="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <servlet>
    <servlet-name>Servlet2</servlet-name>
    <servlet-class>Servlet2</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Servlet2</servlet-name>
    <url-pattern>/Servlet2</url-pattern>
  </servlet-mapping>
</web-app>

3.运行结果

过滤器

1.Servlet类

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

@WebServlet("/Servlet2")
public class Servlet2 extends HttpServlet {
	private static final long serialVersionUID = 1L;
    
    public Servlet2() {
        super();
    }

	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		PrintWriter out = response.getWriter();
		String name = request.getParameter("name");
		if(name != null && !name.isEmpty()){
			out.print("hello"+name);
			out.print(",欢迎来到我的主页");
		}
		else {
			out.println("请输入你的名字");
		}
		out.println("<a href=index.jsp>返回</a>");
		out.flush();
		out.close();
	}

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

}

2.index.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
 
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset="UTF-8">
<title></title>
</head>
<body>
    <form action="Servlet2" method="post">
              <p>
              请输入你的中文名：
              <input type="text" name="name">
              <input type="submit" name="提交">
              </p>               
    </form>         
</body>
</html>

3.filter

package Filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebFilter("/fliter")
public class fliter implements Filter {
    public fliter() {
    	
    }
        
	public void destroy() {
		
	}

	
	public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)
            throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) req;
        HttpServletResponse response = (HttpServletResponse) res;
 
        request.setCharacterEncoding("UTF-8");
		chain.doFilter(request, response);
	}

	public void init(FilterConfig fConfig) throws ServletException {
		
	}

}

4.修改后的web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:web="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <servlet>
    <servlet-name>Servlet2</servlet-name>
    <servlet-class>Servlet2</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>Servlet2</servlet-name>
    <url-pattern>/Servlet2</url-pattern>
  </servlet-mapping>
  <filter>
    <filter-name>EncodingFilter</filter-name>
    <filter-class>Filter.fliter</filter-class>
    <init-param>
    <param-name>encoding</param-name>
    <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>EncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
    <url-pattern>*.jsp</url-pattern>
    <dispatcher>REQUEST</dispatcher>
    <dispatcher>FORWARD</dispatcher>
  </filter-mapping>
</web-app>

5.运行结果