Response输出字符数据和输出字节数据

Response输出字符数据

步骤：

　　1、获取字符输出流

　　2、输出数据

@WebServlet("/responseDemo3")
public class ResponseDemo3 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1、获取字符输出流
        PrintWriter pw = response.getWriter();
        //2、输出数据
        pw.write("你好 Response");
    }

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

注意：

　　乱码原因：编解码使用的字符集不一致

　　　　1.PrintWriter pw = 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

　　设置编码，是在获取流之前进行设置的

@WebServlet("/responseDemo3")
public class ResponseDemo3 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //告诉浏览器，服务器发送的消息体数据的编码。建议浏览器使用改编码解码
        //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 pw = response.getWriter();
        //2、输出数据
        pw.write("你好 Response");
    }

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

 

 

 

 

 

 

 

 

 

Response输出字节数据

步骤：

　　1、获取字节输出流

　　2、输出数据

@WebServlet("/responseDemo4")
public class ResponseDemo4 extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

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

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

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