request 解决中文乱码问题

package request;

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

public class RequestDemo4 extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//表单页面数据以什么吗表发过来，就控制request以什么吗表来读
//解决post提交的中文乱码
request.setCharacterEncoding("UTF-8");//只对post提交有效
System.out.println(request.getParameter("username"));

//get方式提交的数据，解决乱码问题
//由于request.setCharacterEncoding("UTF-8")只对post方式提交的数据有效
//所以这里get方式提交的数据只能手动解决
//request默认使用的是iso8859编码，我们查传过来的数据在iso8859里面对应的编码，再那对应的值去utf-8吗表里查对应的值
String name = request.getParameter("username");
//解决get提交的中文乱码《也适用于超链接提交过来的数据-------超链接提交的额数据是以get方式提交的》
name = new String(name.getBytes("iso8859-1"),"UTF-8");
System.out.println(name);
}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}

}