目录
一、Request通用方式获取请求参数
二、Servlet模板创建
一、Request通用方式获取请求参数
Map<String,String> getParameteMap()：获取所有参数Mapcans参数
String[] getParameter(String name)：根据名称获取参数值（数组）
String getParameter(String name)：根据名称获取参数值（单个值）
代码示例：
req.html:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="/Tomcate-demo2/req2" method="get">
<input type="text" name="username"><br>
<input type="password" name="password"><br>
<input type="checkbox" name="hobby" value="1">游泳
<input type="checkbox" name="hobby" value="2">爬山<br>
<input type="submit">
</form>
</body>
</html> RequestDemo2 :
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Map;
@WebServlet("/req2")
public class RequestDemo2 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//获取所有参数的map集合
Map<String, String[]> map = req.getParameterMap();
for (String key : map.keySet()) {
// username:zhangsan
System.out.print(key + ":");
//获取值
String[] values = map.get(key);
for (String value : values) {
System.out.print(value + " ");
}
System.out.println();
}
System.out.println("------------");
//2、根据key获取对应的参数组，数组
String[] hobbies = req.getParameterValues("hobby");
for (String hobby : hobbies) {
System.out.println(hobby);
}
//3、根据key,获取单个的参数值
String username = req.getParameter("username");
String password = req.getParameter("password");
System.out.println(username);
System.out.println(password);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
this.doGet(req,resp);
}
} 访问req.html，输入数据并且提交：
控制台输出：
二、Servlet模板创建
使用通用方式获取请求参数后，屏蔽了GET和POST的请求方式代码的不同，则代码可以定义为如下格式：
@WebServlet("/req6")
public class RequestDemo6 extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
} 可以使用Servlet模板创建Servlet更高效：
第一步选择File中的Setting
第二步根据对应的红框修改模板
第三步点击右键创建新的Sevlet