post请求的中文乱码问题

post请求的中文乱码问题

设置请求体的字符集为UTF-8，从而解决post请求的中文乱码问题
req.setCharacterEncoding("UTF-8");

这段语句必须在获取请求参数之前调用才有效，如果你先获取了密码的参数，再设置字符集，然后再获取用户名的参数，那么用户名的参数也会乱码的。

package LWB;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Arrays;

public class ParameterServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("----------------doGet---------------");
        String username=req.getParameter("username");
        String password=req.getParameter("password");
        String[] hobby=req.getParameterValues("hobby");
        System.out.println("用户名："+username);
        System.out.println("密码："+password);
        System.out.println("兴趣爱好："+ Arrays.asList(hobby));
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
//      设置请求体的字符集为UTF-8，从而解决post请求的中文乱码问题
        req.setCharacterEncoding("UTF-8");
        System.out.println("----------------doPost---------------");
        String username=req.getParameter("username");
        String password=req.getParameter("password");
        String[] hobby=req.getParameterValues("hobby");
        System.out.println("用户名："+username);
        System.out.println("密码："+password);
        System.out.println("兴趣爱好："+ Arrays.asList(hobby));
    }
}