获取页面参数中文乱码问题
通过getParameter(“name”)方法获取页面参数时，当页面参数输入为中文的时候，获取到的中文参数会出现乱码的问题。
例如：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="test01" method="post">
账号：<input type="text" placeholder="请输入姓名" name="username">
<br>
密码：<input type="text" placeholder="请输入密码" name="password">
<input type="submit" value="提交">
</form>
</body>
</html>
运行结果：
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("/test01")
public class test01_Servlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String username = request.getParameter("username"); //获取username的值
System.out.println(username); //打印
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
get方式：提交不会出现乱码，因为Tomcat内部已经解决了该问题
post方式：会出现乱码
解决方法：
设置流的字符编码格式，因为使用post请求的时候，把请求体包装成了流，需
要设置和前端口页面一样的字符编码格式。
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("/test01")
public class test01_Servlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf-8"); //设置编码格式
String username = request.getParameter("username");
System.out.println(username);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}
运行结果：
