sevlet使用request-获取参数和中文乱码问题
servlet代码：
package com.lbl.servlet;
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;
@WebServlet("/Demo02Servlet")
public class Demo02Servlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println(username);
System.out.println(password);
}
}
JSP代码：
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>$Title$</title>
</head>
<body>
<form method="post" action="/Day04_war_exploded/Demo02Servlet">
账号： <input type="text" name="username"><br>
密码： <input type="text" name="password"><br>
<input type="submit" value="提交">
</form>
</body>
</html>
效果图：
出现了中文乱码
但当改成get方法提交时，效果如下：
可以得出结论：
当是post方法提交时，会出现中文乱码问题，但get方法支持中文
post方法乱码的解决方法：
request.setCharacterEncoding("utf-8");
完整代码：
package com.lbl.servlet;
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;
@WebServlet("/Demo02Servlet")
public class Demo02Servlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
String username = request.getParameter("username");
String password = request.getParameter("password");
System.out.println(username);
System.out.println(password);
}
}
运行效果：
乱码问题解决！