遇到問題：
1.字符集亂碼—》utf-8和GBK直接換下試試；
2.HTTP Status 404 – Not Found—》web.xml沒配好，或者代碼寫錯了。。
1.配置pom.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.sise</groupId>
<artifactId>MavenWeb</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>MavenWeb Maven Webapp</name>
<url>http://maven.apache.org</url>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/javax/javaee-web-api -->
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-web-api</artifactId>
<version>8.0.1</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<finalName>MavenWeb</finalName>
</build>
</project>
<%@ page contentType="text/html" pageEncoding="GBK"%>
<!DOCTYPE html>
<html>
<head>
<title>Insert title here</title>
</head>
<body>
<h2>Hello World!</h2>
<form action="/MavenWeb/WelcomeServlet" method="post">
請輸入問候名字：<input type='text' name="name" /><br/>
<input type='submit' name="問候">
</form>
</body>
</html>
<%@ page contentType="text/html" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
問候信息：<%=request.getAttribute("welcome")%>
</body>
</html>
package com.sise.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class WelcomeServlet extends HttpServlet{
private static final long serialVersionUID = 1L;
public WelcomeServlet() {
// TODO Auto-generated constructor stub
super();
}
public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException{
request.setCharacterEncoding("utf-8");
String name = request.getParameter("name");
String welcome = "Hello,"+name;
request.setAttribute("welcome", welcome);
request.getRequestDispatcher("/welcome.jsp").forward(request, response);
}
public void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {
doGet(request, response);
}
}
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >
<web-app>
<display-name>Archetype Created Web Application</display-name>
<servlet>
<servlet-name>WelcomeServlet</servlet-name>
<display-name>WelcomeServlet</display-name>
<description></description>
<servlet-class>com.sise.servlet.WelcomeServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>WelcomeServlet</servlet-name>
<url-pattern>/WelcomeServlet</url-pattern>
</servlet-mapping>
</web-app>
