Response_输出字符数据以及输出字节数据

Response_输出字符数据以及输出字节数据

 步骤：

　　1.获取字符输出流

　　2.输出数据

@WebServlet(name = "ResponseDemo3", value = "/ResponseDemo3")
public class ResponseDemo3 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {//1.获取字符输出流
        PrintWriter writer = response.getWriter();
        //2.输出数据
        writer.println("你好啊啊啊 response");
    }
}

注意：

　　乱码问题：

　　　　1.编解码不一致：PrintWriter writer = response.getWriter();：获取的流的默认编码是ISO-8859-1

　　　　2.设置该流的默认编码

　　　　3.告诉浏览器响应体使用的编码

@WebServlet(name = "ResponseDemo3", value = "/ResponseDemo3")
public class ResponseDemo3 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        //获取流对象之前，设置流的默认编码：IOS-8859-1 设置为：GBK
//        response.setCharacterEncoding("GBK");

        //告诉浏览器，服务器发送的消息体数据的编码，建议浏览器使用编码解码
//        response.setHeader("content-type", "text/html;charset=utf-8");

        //简单的形式，设置编码
        response.setContentType("text/html;charset=utf-8");

        //1.获取字符输出流
        PrintWriter writer = response.getWriter();
        //2.输出数据
        writer.println("你好啊啊啊 response");
    }
}

输出字节数据

步骤：

　　1.获取字节输出流

　　2.输出数据

@WebServlet(name = "ResponseDemo4", value = "/ResponseDemo4")
public class ResponseDemo4 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        this.doPost(request, response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

        response.setContentType("text/html;charset=utf-8");

        //1.获取字节输出流
        ServletOutputStream sos = response.getOutputStream();
        //2.输出数据
        sos.write("你好".getBytes("utf-8"));//转换字节
    }
}