JavaWeb实现表单提交的示例详解
时间：2023-01-18 11:00:12 | 栏目：JAVA代码 | 点击：次
register.html
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>register.html</title>
</head>
<body>
<center><h1>注册表单</h1></center>
<center>
<form action="register" method="get">
用户名:<input type="text" name="username"/><br/>
密码:<input type="password" name="pwd"/><br/>
请选择感兴趣的研究方向：
<label for="01">人工智能</label>
<input type="checkbox" name="interest" value="AI" id="01" />
<label for="02">机器学习</label>
<input type="checkbox" name="interest" value="ML" id="02" />
<label for="03">自动驾驶</label>
<input type="checkbox" name="interest" value="AutoDrive" id="03" />
<label for="04">网络安全</label>
<input type="checkbox" name="interest" value="Network" id="04" />
<br/> <input type="submit" name="smt" value="提交"/>
</form>
</center>
</body>
</html>
RegisterServlet.java
package request;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.Enumeration;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class RegisterServlet extends HttpServlet{
//调出doGet方法
protected void doGet(HttpServletRequest req,HttpServletResponse res)
throws ServletException,IOException {
//使用req接收请求参数
String strName=req.getParameter("username");
//处理中文乱发问题
byte[] bs=strName.getBytes("iso8859-1");
String name=new String(bs,"utf-8");
System.out.println(name);
}
//调出doPost方法
protected void doPost(HttpServletRequest req,HttpServletResponse res)
throws ServletException,IOException {
//设置请求参数中的编码
req.setCharacterEncoding("utf-8");
//使用req接收请求参数
String strName=req.getParameter("username");
System.out.println("strName");
}
//调出service方法
protected void service(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException{
PrintWriter pw=response.getWriter();
System.out.println("注册。。。");
//1.获取浏览器端发送请求的完整路径；
StringBuffer sbuf=request.getRequestURL();
pw.println("url:"+sbuf);
//System.out.println(sbuf);
//2.获取资源名部分-请求路径中8080后的地址;
String uri=request.getRequestURI();
pw.println("uri:"+uri);
//3.获取请求路径中参数;
String qs=request.getQueryString();
pw.println("qs:"+qs);
//4.获取请求路径中的ip地址;
String ip=request.getRemoteAddr();
pw.println("ip:"+ip);//ip=127.0.0.1
//5.获取浏览器发送请求的方式(get请求、post请求)
//在浏览器端，浏览器地址栏回车、超链接、表单的默认方式都是get请求方式
//在浏览器端，表单设置method="post"的方式提交是post请求方式
String method=request.getMethod();
pw.println("method="+method);//method=GET
//6.获取web应用名
String cp=request.getContextPath();
pw.println("cp="+cp);//cp=/servlet
//接收表单提交发送过来的参数
//获得单个value值
String strName=request.getParameter("username");
String strPwd=request.getParameter("pwd");
pw.println("Name:"+strName+" Pwd:"+strPwd);
//获得多个对应value值
String[] strInterest=request.getParameterValues("interest");
pw.println(Arrays.toString(strInterest));
//获取请求参数中所有的name值
Enumeration<String> names=request.getAttributeNames();
pw.println(names);
//使用循环将names中的内容取出
while(names.hasMoreElements()){
System.out.println(names.nextElement());
}
}
}
修改web.xml,添加如下code
<!-- 配置RegisterServlet --> <servlet> <servlet-name>RegisterServlet</servlet-name> <!-- 配置Servlet的路径：包名+类名 --> <servlet-class>request.RegisterServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>RegisterServlet</servlet-name> <url-pattern>/register</url-pattern> </servlet-mapping>
重新配置服务器
先点击左侧图标
再点击Redeploy,重新部署Tomcat服务器
访问表单页面
http://127.0.0.1:8080/Servlet/register.html